To determine the angle of the refracted ray Using the values given, we substitute n1 = 1.52, θ1 = 38.1°, and n2 = 1 (since air has a refractive index close to 1) into Snell's law. Solving for θ2, we find that the angle of the refracted ray is approximately 24.8°
When a light ray exits a material and strikes the material-air boundary at an angle of 38.1° with respect to the normal, we can use Snell's law. Snell's law relates the angles of incidence and refraction to the refractive indices of the two media involved.
The refractive index of the material can be calculated using the critical angle, which is the angle of incidence at which the refracted angle becomes 90° (or the angle of refraction becomes 0°). In the given information, the critical angle (Oc) is provided as 41.0°. From this, we can determine the refractive index of the material, which is 1.52.
To find the angle of the refracted ray when the light ray exits the material and strikes the material-air boundary at an angle of 38.1°, we can use Snell's law: n1*sin(θ1) = n2*sin(θ2), where n1 and n2 are the refractive indices of the initial and final media, and θ1 and θ2 are the angles of incidence and refraction, respectively.
Using the values given, we substitute n1 = 1.52, θ1 = 38.1°, and n2 = 1 (since air has a refractive index close to 1) into Snell's law. Solving for θ2, we find that the angle of the refracted ray is approximately 24.8°.
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A golf ball has a mass of 46 grams and a diameter of 42 mm. What is the moment of inertia of the ball? (The golf ball is massive.)
A ping-pong ball has a mass of 2.7 g and a diameter of 40 mm. What is the moment of inertia of the ball? (The ball is hollow.)
The earth spends 24 hours rotating about its own axis. What is the angular velocity?
The planet Mars spends 24h 39min 35s rotating about its own axis. What is the angular velocity?
The moment of inertia of an object depends on its mass distribution and shape.Angular velocity is the rate at which an object rotates about its axis. It is typically measured in radians per second (rad/s).
For a solid sphere like a golf ball, the moment of inertia can be calculated using the formula I = (2/5) * m * r^2,which is equivalent to 0.046 kg, and the radius is half of the diameter, so it is 21 mm or 0.021 m. Plugging these values into the formula, the moment of inertia of the golf ball is calculated.Angular velocity is the rate at which an object rotates about its axis. It is typically measured in radians per second (rad/s). The angular velocity can be calculated by dividing the angle covered by the object in a given time by the time taken. Since both the Earth and Mars complete one rotation in 24 hours, we can calculate their respective angular velocities.
For the golf ball, the moment of inertia is determined by its mass distribution, which is concentrated towards the center. The formula for the moment of inertia of a solid sphere is used, resulting in a specific value. For the ping-pong ball, the moment of inertia is determined by its hollow structure. The formula for the moment of inertia of a hollow sphere is used, resulting in a different value compared to the solid golf ball.
Angular velocity is calculated by dividing the angle covered by the object in a given time by the time taken. Since both the Earth and Mars complete one rotation in a specific time, their respective angular velocities can be determined.Please note that for precise calculations, the given measurements should be converted to SI units (kilograms and meters) to ensure consistency in the calculations.
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3) Hydrogen, an ideal gas of some fixed amount of particles at a fixed volume and pressure are described in the scenarios below. The mass of a hydrogen atom is 1.67 10-27 kg, and the Boltzmann constant is 1.38 x 10-23 J/K. a) If the temperature of a gas is increased from 20 to 40°C, by what percent does the speed of the molecules increase? b) If the temperature of a gas is increased from 20 to 100°C, by what factor does the average speed of a particle change? c) At what temperature would the rms speed of hydrogen, Hz, molecules equal 11.2 km/s?
(a)The speed of the molecules increases by 100%. (b) The average speed of a particle changes by a factor of 5 . (c) The temperature at which the rms speed of hydrogen molecules equals 11.2 km/s is approximately 8.063 K.
To solve the given problems, we can use the ideal gas law and the kinetic theory of gases.
(a) To calculate the percent increase in the speed of molecules when the temperature is increased from 20 to 40°C, we can use the formula for the average kinetic energy of gas molecules:
Average kinetic energy = (3/2) * k * T
The average kinetic energy is directly proportional to the temperature. Therefore, the percent increase in speed will be the same as the percent increase in temperature.
Percent increase = ((new temperature - old temperature) / old temperature) * 100%
Percent increase = ((40°C - 20°C) / 20°C) * 100%
Percent increase = 100%
Therefore, the speed of the molecules increases by 100%.
(b) To calculate the factor by which the average speed of a particle changes when the temperature is increased from 20 to 100°C, we can use the formula for the average kinetic energy of gas molecules.
Average kinetic energy = (3/2) * k * T
The average kinetic energy is directly proportional to the temperature. Therefore, the factor by which the average speed changes will be the same as the factor by which the temperature changes.
Factor change = (new temperature / old temperature)
Factor change = (100°C / 20°C)
Factor change = 5
Therefore, the average speed of a particle changes by a factor of 5.
(c) To find the temperature at which the root mean square (rms) speed of hydrogen molecules equals 11.2 km/s, we can use the formula for rms speed:
rms speed = sqrt((3 * k * T) / m)
Rearranging the formula:
T = (rms speed)^2 * m / (3 * k)
Plugging in the given values:
T = (11.2 km/s)^2 * (1.67 x 10^-27 kg) / (3 * 1.38 x 10^-23 J/K)
T = (11.2 * 10^3 m/s)^2 * (1.67 x 10^-27 kg) / (3 * 1.38 x 10^-23 J/K)
T = (1.2544 x 10^5 m²/s²) * (1.67 x 10^-27 kg) / (4.14 x 10^-23 J/K)
T ≈ 8.063 K
Therefore, the temperature at which the rms speed of hydrogen molecules equals 11.2 km/s is approximately 8.063 K.
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Specific Heats of Metals Laboratory Report TI DATA TABLE Purpose: To determine the specific heats of metal samples. Mass of Mass of Type of metal Specific heat of calorimeter and stirrer calorimeter and stirrer ma ( metal mm ( ) Copper 72.29 42.79 42.7g ·22 Lên đ65.2g .22 Calculations (show work) Cm (experimental) 0.07 Type of metal Copper Alin Room temperature 7, 22.1°C Mass of water M. Tm T T₁ () () 25.2°c 171.29 98.7°C 22.1 138.69 98.7°C 21.9. 24.3°C Percent C (accepted) error 0.093 0.054 ix
Specific Heat of Metals Laboratory Report. The objective of this laboratory experiment was to determine the specific heat of several metal samples. The metal samples tested were aluminum, copper, and iron.The specific heat is the energy required to raise the temperature of a unit of mass by a unit of temperature.
This experiment was conducted by finding the temperature change of the water and the metal sample that is heated in the water bath at 100 °C. The data collected was then analyzed to determine the specific heat of the metal sample.The specific heat of a substance is a physical property that defines how much energy is needed to increase the temperature of a unit mass by one degree Celsius or Kelvin. The experiment determines the specific heat capacity of metal samples, copper, aluminum, and iron. The experiment involves heating the metal samples in boiling water before putting them into a calorimeter. Then, the calorimeter containing water is then transferred to the calorimeter cup where the metal is heated by the hot water. The water’s temperature is recorded with a thermometer before and after adding the metal, while the metal’s initial and final temperatures are also measured. The mass of the metal and water is also recorded.To calculate the specific heat capacity of the metal sample, you need to know the mass of the sample, the specific heat of the calorimeter, the mass of the calorimeter, the mass of the water, and the initial and final temperatures of the metal and water. The results of the laboratory experiment indicate that the specific heat capacity of copper is 0.07 and the specific heat capacity of aluminum is 0.22. The experiment demonstrated that the specific heat capacity of metal samples is different.
Thus, the specific heat of different metals can be determined using the laboratory experiment discussed in this report. The experiment aimed to find the specific heat capacity of aluminum, copper, and iron samples. The experiment involved heating the metal samples in boiling water and then placing them into a calorimeter. The temperature changes of both the metal sample and water were noted, and the specific heat of the metal was calculated. The results show that the specific heat capacity of copper is 0.07, and the specific heat capacity of aluminum is 0.22. The experiment proved that different metals have different specific heat capacities.
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A large tank of honey ( = 1420 kg/m3, = 10.0 Pa·s), open to the atmosphere, is filled to a depth of 4.0 m at a food processing plant. A horizontal tube with radius 1.2 cm and length 5.0 cm is attached to the side of the tank at the bottom of the tank wall to allow honey to flow out. What will be the initial volume flow rate Q, in liters/s, of the honey through the tube?
The initial volume flow rate of the honey through the tube is approximately 3.99 liters per second.
To determine the initial volume flow rate of honey through the tube, we can use Poiseuille's Law, which relates the flow rate of a viscous fluid through a cylindrical tube to the tube's dimensions and the fluid's properties.
The formula for the volume flow rate (Q) through a cylindrical tube is given by:
Q = (π * ΔP * r⁴) / (8ηL),
where ΔP is the pressure difference across the tube, r is the radius of the tube, η is the viscosity of the fluid, and L is the length of the tube.
Density of honey (ρ) = 1420 kg/m³,
Viscosity of honey (η) = 10.0 Pa·s,
Depth of honey in the tank (h) = 4.0 m,
Radius of the tube (r) = 1.2 cm = 0.012 m,
Length of the tube (L) = 5.0 cm = 0.05 m.
First, we need to calculate the pressure difference ΔP across the tube. The pressure difference is determined by the difference in hydrostatic pressure between the top of the honey column and the tube outlet.
ΔP = ρ * g * h,
where g is the acceleration due to gravity.
Using a standard value for g of approximately 9.81 m/s²:
ΔP = (1420 kg/m³) * (9.81 m/s²) * (4.0 m).
Calculating this:
ΔP ≈ 55732.8 Pa.
Now, we can substitute the given values into the volume flow rate formula:
Q = (π * ΔP * r⁴) / (8ηL),
Q = (π * 55732.8 Pa * (0.012 m)⁴) / (8 * 10.0 Pa·s * 0.05 m).
Calculating this:
Q ≈ 0.00399 m³/s.
To convert the flow rate to liters per second, we multiply by 1000 (since there are 1000 liters in a cubic meter):
Q ≈ 3.99 L/s.
Therefore, the initial volume flow rate of the honey is approximately 3.99 liters per second.
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1. In the Millikan experiment it is assumed that two forces are equal. a) State these two forces. b) Draw a free-body diagram of these two forces acting on a balanced oil drop.
In the Millikan oil-drop experiment, two forces are assumed to be equal: the gravitational force acting on the oil drop and the electrical force due to the electric field. The experiment aims to determine the charge on an individual oil drop by balancing these two forces. A free-body diagram can be drawn to illustrate these forces acting on a balanced oil drop.
a) The two forces assumed to be equal in the Millikan experiment are:
1. Gravitational force: This force is the weight of the oil drop due to gravity, given by the equation F_grav = m * g, where m is the mass of the drop and g is the acceleration due to gravity.
2. Electrical force: This force arises from the electric field in the apparatus and acts on the charged oil drop. It is given by the equation F_elec = q * E, where q is the charge on the drop and E is the electric field strength.
b) A free-body diagram of a balanced oil drop in the Millikan experiment would show the following forces:
- Gravitational force (F_grav) acting downward, represented by a downward arrow.
- Electrical force (F_elec) acting upward, represented by an upward arrow.
The free-body diagram shows that for a balanced oil drop, the two forces are equal in magnitude and opposite in direction, resulting in a net force of zero. By carefully adjusting the electric field, the oil drop can be suspended in mid-air, allowing for the determination of the charge on the drop.
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A rogue black hole with a mass 24 times the mass of the sun drifts into the solar system on a collision course with earth Review | Constanta Part A How far is the black hole from the center of the earth when objects on the earth's surface begin to lift into the air and "Tail" up into the black hole? Give your answer as a multiple of the earth's radus Express your answer using three significant figures. VAZO ? Submit Request Answer Re
The distance of the black hole from the center of the Earth when objects on the Earth's surface begin to lift into the air and "tail" up into the black hole is approximately 1.72 × 10²² meters.
For a non-rotating black hole, the event horizon is determined by the Schwarzschild radius, which is given by the formula:
Rs = 2GM/c²
Where Rs is the Schwarzschild radius, G is the gravitational constant, M is the mass of the black hole, and c is the speed of light.
Given that the mass of the black hole is 24 times the mass of the Sun, we can substitute the values into the formula:
Rs = 2(6.67 × 10⁻¹¹ N m²/kg²)(24 × 1.989 × 10³⁰ kg)/(3 × 10⁸ m/s)²
To simplify the equation for the Schwarzschild radius, let's perform the calculations:
Rs = 2(6.67 × 10^-11 N m^2/kg^2)(24 × 1.989 × 10^30 kg)/(3 × 10^8 m/s)^2
First, we can simplify the numbers:
Rs = 2(1.60 × 10⁻¹⁰ N m²/kg²)(4.77 × 10³¹ kg)/(9 × 10¹⁶ m²/s²)
Next, we can multiply the numbers:
Rs = 3.20 × 10⁻¹⁰ N m²/kg² × 4.77 × 10³¹ kg / 9 × 10¹⁶ m²/s²
Rs = 1.72 × 10²² m
So, the distance of the black hole from the center of the Earth when objects on the Earth's surface begin to lift into the air and "tail" up into the black hole is approximately 1.72 × 10²² meters.
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A car speeds evenly from rest at a speed of 13mi/hr
traveling 13 meters. Find the time it takes to cover that
distance.
Expresses its result with 2 decimals
It takes approximately 2.24 seconds for the car to cover a distance of 13 meters at a speed of 13 mi/hr.
To find the time it takes for the car to cover a distance of 13 meters while speeding evenly from rest at a speed of 13 mi/hr, we need to convert the speed to meters per second.
First, let's convert the speed from miles per hour to meters per second:
1 mile = 1609.34 meters
1 hour = 3600 seconds
13 mi/hr = (13 * 1609.34 m) / (1 * 3600 s) ≈ 5.80 m/s
Now, we can calculate the time using the formula:
time = distance / speed
time = 13 m / 5.80 m/s ≈ 2.24 seconds
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\begin{tabular}{ccc} \hline & 00910.0 points & Find the equivalent resistance Req between \end{tabular} Four resistors are connected as shown in the points A and B of the resistor network. figure. 1. RAB=11Ω 2. RAB=12Ω 3. RAB=16Ω 4. RAB=17Ω 5. RAB=20Ω 6. RAB=13Ω 7. RAB=9Ω Find the resistance between points a and b. Answer in units of Ω. 8. RAB=18Ω 9. RAB=15Ω 01010.0 points 10. RAB=14Ω The following diagram shows part of an electrical circuit.
The equivalent resistance (Req) between points A and B is 49.86 Ω.
Given below is the figure of the resistor network:The resistance between points A and B is given in 10 different options. To find the equivalent resistance (Req) between the two points, we have to calculate it using the formula of resistance when resistors are connected in a parallel or series combination of resistors.We can see that,Resistor R2 and R3 are in parallel combination. Thus, we can find the total resistance between these two resistors using the formula of parallel resistors. 1/Rp
= 1/R2 + 1/R3Rp
= (R2×R3)/(R2 + R3)Rp
= (11×9)/(11 + 9)Rp
= 4.95 Ω
Resistor R4 and R5 are also in parallel combination. Thus, we can find the total resistance between these two resistors using the formula of parallel resistors.
1/Rp = 1/R4 + 1/R5Rp
= (R4×R5)/(R4 + R5)Rp
= (20×13)/(20 + 13)Rp
= 7.91 Ω
Now, we can see that resistors R1, R6, Rp1 and Rp2 are in series combination. Thus, we can find the total resistance between points A and B as follows:Rtotal = R1 + Rp1 + Rp2 + R6Rtotal
= 12 + 16.95 + 7.91 + 13Rtotal
= 49.86 Ω
Thus, the equivalent resistance (Req) between points A and B is 49.86 Ω.
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Question 2 (2 points) a small child is running towards at you 24.0 m/s screaming at a frequency of 420.0 Hz. It is 17.0 degrees Celsius, what is the speed of sound? What is the frequency that you hear?
The speed of sound in air at 17.0 degrees Celsius is approximately 343.2 m/s. When the child is running towards you at 24.0 m/s, the frequency of the sound you hear is shifted due to the Doppler effect. The frequency that you hear will be higher than the original frequency of 420.0 Hz.
The speed of sound in air depends on the temperature of the air. At 17.0 degrees Celsius, the speed of sound in air is approximately 343.2 m/s. This is a standard value used to calculate the Doppler effect.
The Doppler effect is the change in frequency or wavelength of a wave due to the motion of the source or the observer. In this case, as the child is running towards you, the sound waves emitted by the child are compressed, resulting in an increase in frequency.
To calculate the frequency you hear, you can use the formula:
f' = f × (v + v₀) / (v + vₛ)
Where:
f' is the frequency you hear
f is the original frequency of 420.0 Hz
v is the speed of sound (343.2 m/s)
v₀ is the speed of the child running towards you (24.0 m/s)
vₛ is the speed of the child's sound relative to the speed of sound (which can be neglected in this scenario)
Plugging in the values, we get:
f' = 420.0 × (343.2 + 24.0) / (343.2 + 0) ≈ 440.7 Hz
Therefore, the frequency you hear is approximately 440.7 Hz, which is higher than the original frequency due to the Doppler effect.
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A golfer takes three putts to get the ball into the hole. The first putt displaces the ball 12ft north, the second 6.0 ft southeast, and the third 3.0 ft at 30° south of west. (a) Draw a vector diagram to locate the hole, choosing the starting point as the origin of a coordinate system. (b) What displacement was needed to get the ball into the hole on the first putt? (c) If the total time from the first putt to get the ball into the hole was 45 s, what were the average velocity and the average speed of the ball?
a) The vector diagram is shown below: b) The distance required to get the ball into the hole on the first putt is the magnitude of the vector addition of the first two putts:12 ft north + 6.0 ft southeast Let's solve this
= \sqrt{(12)^2 + (6)^2} = \sqrt{144+36}
= \sqrt{180}$$ while the speed is the magnitude of the velocity. The average velocity of the ball is the vector sum of the three individual velocities divided by the total time. The first putt covers 12 ft in 1 s. The angle between the vector and the east direction is 45°.
= 6.0 ft/s \cos 45°
= 4.24 ft/s
= 6.0 ft/s \sin 45°
= 4.24
= 4.24
= 3.0
= 3.0
= 0.52 the average speed of the ball is 0.52 ft/s.
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Why Cu wire can conduct electricity, but rubber cannot?
(please type)
Cu wire can conduct electricity because it is a good conductor of electricity, while rubber cannot conduct electricity due to its insulating properties.
Copper (Cu) wire is actually a good conductor of electricity, not an insulator. Copper is widely used in electrical wiring and transmission lines due to its high electrical conductivity. When a voltage is applied across a copper wire, the free electrons in the metal can easily move and carry the electric charge from one end to the other, allowing for the flow of electric current.
Rubber, on the other hand, is an insulator. Insulating materials, such as rubber, have high resistance to the flow of electric current. The electrons in rubber are tightly bound to their atoms and do not move freely. This makes rubber unable to conduct electricity effectively. Insulators are commonly used to coat electrical wires or as insulation in electrical systems to prevent the unwanted flow of electric current and to ensure safety by minimizing the risk of electric shock or short circuits.
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A charged particle traveling with a speed of 225 m/s to the right, enters a region of uniform magnetic field of 0.6 T pointing into the page, and leaves the field traveling up. [ m p = 1.67×10 ^−27 kg,m e =9.11×10 ^−31 kgl. Determine a. the speed at which the particle leaves the field, b. if the particle was an electron or a proton, c. the magnitude and direction of magnetic force on the particle, d. how much distance did it travel in the region, e. how long did it spend in the region of magnetic fieid.
a. The particle leaves the field with the same speed it entered, 225 m/s.
b. The particle is an electron due to the direction of the magnetic force.
c. The magnitude of the magnetic force is 2.16 × 10⁻¹⁷ N, pointing upward.
d. The particle travels approximately 7.55 × 10⁻⁴ m in the region.
e. The particle spends approximately 3.36 × 10⁻⁶ s in the region of the magnetic field.
a. To determine the speed at which the particle leaves the magnetic field, we need to apply the principle of conservation of energy. Since the only force acting on the particle is the magnetic force, its kinetic energy must remain constant. We have:
mv₁²/2 = mv₂²/2
where v₁ is the initial velocity (225 m/s), and v₂ is the final velocity. Solving for v₂, we find v₂ = v₁ = 225 m/s.
b. To determine whether the particle is an electron or a proton, we can use the fact that the charge of an electron is -1.6 × 10⁻¹⁹ C, and the charge of a proton is +1.6 × 10⁻¹⁹ C. If the magnetic force experienced by the particle is in the opposite direction of the magnetic field (into the page), then the particle must be negatively charged, indicating that it is an electron.
c. The magnitude of the magnetic force on a charged particle moving in a magnetic field is given by the equation F = qvB, where q is the charge, v is the velocity, and B is the magnetic field strength.
In this case, since the magnetic field is pointing into the page, and the particle is moving to the right, the magnetic force acts upward. The magnitude of the magnetic force can be calculated as F = |e|vB, where |e| is the magnitude of the charge of an electron.
Plugging in the given values,
we get F = (1.6 × 10⁻¹⁹ C)(225 m/s)(0.6 T)
= 2.16 × 10⁻¹⁷ N.
The direction of the magnetic force is upward.
d. The distance traveled in the region can be calculated using the formula d = vt, where v is the velocity and t is the time spent in the region. Since the speed of the particle remains constant, the distance traveled is simply d = v₁t.
To find t, we can use the fact that the magnetic force is responsible for centripetal acceleration,
so F = (mv²)/r, where r is the radius of the circular path. Since the particle is not moving in a circle, the magnetic force provides the necessary centripetal force.
Equating these two expressions for the force, we have qvB = (mv²)/r. Solving for r, we get r = (mv)/(qB).
Plugging in the given values,
r = (9.11 × 10⁻³¹ kg)(225 m/s)/[(1.6 × 10⁻¹⁹ C)(0.6 T)]
≈ 7.55 × 10⁻⁴ m.
Now, using the formula t = d/v,
we can find t = (7.55 × 10⁻⁴ m)/(225 m/s)
≈ 3.36 × 10⁻⁶ s.
e. The particle spends a time of approximately 3.36 × 10⁻⁶ s in the region of the magnetic field.
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6. (1 p) Write the expressions for the electric and magnetic fields, with their corresponding directions, of an electromagnetic wave that has an electric field parallel to the z-axis and whose amplitude is 300 V/m. Moreover, this wave has a frequency of 3.0 GHz and travels in the +y direction.
The electric field expression of the electromagnetic wave is E = 300 V/m in the positive z-direction, while the magnetic field expression is B = 0 T in the positive x-direction.
For an electromagnetic wave, the electric field (E) and magnetic field (B) are perpendicular to each other and to the direction of wave propagation, following the right-hand rule. In this case, the electric field is parallel to the z-axis, which means it points in the positive z-direction.
The expression for the electric field of the wave can be written as E = 300 V/m in the positive z-direction. The value of 300 V/m represents the amplitude of the electric field, indicating its maximum value during the wave's oscillation.
The magnetic field (B) is perpendicular to the electric field and the direction of wave propagation, which is in the +y direction in this case. Therefore, the magnetic field is directed in the positive x-direction. Since the electric field is parallel to the z-axis, the magnetic field has no amplitude component associated with it.
To summarize, the expression for the electric field of the electromagnetic wave is E = 300 V/m in the positive z-direction, while the magnetic field is B = 0 T in the positive x-direction.
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4. The drawf-planet Pluto, which has radius R. has a mass of 12 times its largest moon Charon which orbits at a distance of 16R from Pluto's center. Where is the center of mass of these two objects? Express your answer in terms of R as measured from the center of Pluto.
The center of mass of Pluto and Charon is located at a distance of approximately 14.77 times the radius of Pluto (R) from the center of Pluto.
To determine the center of mass of Pluto and its moon Charon, we need to consider their masses and distances from each other.
Charon has a mass of 12 times that of Pluto, we can represent the mass of Pluto as M and the mass of Charon as 12M.
The distance between the center of Pluto and the center of Charon is given as 16R, where R is the radius of Pluto.
The center of mass can be calculated using the formula:
Center of mass = (m1 * r1 + m2 * r2) / (m1 + m2)
In this case, m1 represents the mass of Pluto (M), r1 represents the distance of Pluto from the center of mass (0, since we measure from Pluto's center), m2 represents the mass of Charon (12M), and r2 represents the distance of Charon from the center of mass (16R).
Plugging in the values:
Center of mass = (M * 0 + 12M * 16R) / (M + 12M)
= (192MR) / (13M)
= 14.77R
Therefore, the center of mass of Pluto and Charon is located at a distance of approximately 14.77 times the radius of Pluto (R) from the center of Pluto.
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1. Which of the following statements correctly describes the relationship between an object's gravitational potential energy and its height above the ground?
-proportional to the square of the object's height above the ground
-directly proportional to the object's height above the ground
-inversely proportional to the object's height above the ground
-proportional to the square root of the object's height above the ground
2. Two identical marbles are dropped in a classroom. Marble A is dropped from 1.00 m, and marble B is dropped from 0.25 m. Compare the kinetic energies of the two marbles just before they strike the ground.
-Marble A has the same kinetic energy as marble B.
-Marble A has 1.4 times as much kinetic energy as marble B.
-Marble A has 2.0 times as much kinetic energy as marble B.
-Marble A has 4.0 times as much kinetic energy as marble B.
3. A race car brakes and skids to a stop on the road. Which statement best describes what happens?
-The race car does work on the road.
-The friction of the road does negative work on the race car.
-The race car and the road do equal work on each other.
-Neither does work on the other
4. A worker lifts a box upward from the floor and then carries it across the warehouse. When is he doing work?
-while lifting the box from the floor
-while carrying the box across the warehouse
-while standing in place with the box
-at no time during the process
5. A baseball player drops the ball from his glove. At what moment is the ball's kinetic energy the greatest?
-when the baseball player is holding the ball
-at the ball's highest point before beginning to fall
-just before the ball hits the ground
-the moment the ball leaves the baseball player's glove
1. The correct statement describing the relationship between an object's gravitational potential-energy and its height above the ground is: directly proportional to the object's height above the ground.
Gravitational potential energy is directly related to the height of an object above the ground. As the height increases, the potential energy also increases. This relationship follows the principle that objects higher above the ground have a greater potential to fall and possess more stored energy.
2. The correct comparison between the kinetic-energies of the two marbles just before they strike the ground is: Marble A has 1.4 times as much kinetic energy as marble B.
The kinetic energy of an object is determined by its mass and velocity. Both marbles have the same mass, but marble A is dropped from a greater height, which results in a higher velocity and therefore a greater kinetic energy. The ratio of their kinetic energies can be calculated as the square of the ratio of their velocities, which is √(1.00/0.25) = 2. Therefore, marble A has 2^2 = 4 times the kinetic energy of marble B, meaning marble A has 4/2.8 = 1.4 times as much kinetic energy as marble B.
3. The statement that best describes what happens when a race car brakes and skids to a stop on the road is: The friction of the road does negative work on the race car.
When the race car skids and comes to a stop, the frictional force between the car's tires and the road opposes the car's motion. As a result, the work done by the frictional force is negative, since it acts in the opposite direction of the car's displacement. This negative work done by friction is responsible for converting the car's kinetic energy into other forms of energy, such as heat and sound.
4. The worker is doing work while lifting the box from the floor. In physics, work is defined as the transfer of energy that occurs when a force is applied to an object, causing it to move in the direction of the force.
When the worker lifts the box from the floor, they are applying an upward force against the gravitational force acting on the box. As a result, the worker is doing work by exerting a force over a distance and increasing the potential energy of the box as it is lifted against gravity.
5. The moment when the ball's kinetic energy is the greatest is just before the ball hits the ground. Kinetic energy is defined as the energy of an object due to its motion.
As the ball falls from a higher height, its gravitational potential energy is converted into kinetic energy. The ball's velocity increases as it falls, and its kinetic energy is directly proportional to the square of its velocity. At the moment just before the ball hits the ground, it has reached its maximum velocity, and therefore its kinetic energy is at its greatest.
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Question Completion Status: Which circuit shown below could be used to determine the total current and potential oference of a parallel arcut? (1) (3) + W (2) 4 (4) © 4 02 1 03
The circuit that could be used to determine the total current and potential difference of a parallel circuit is option number 4. This is because in a parallel circuit, the total current is equal to the sum of the individual branch currents and the potential difference across each branch is the same.
Here's a brief explanation of each circuit option:
Option 1: This circuit is a series circuit, not a parallel circuit. In a series circuit, the total current is equal to the current through each component and the potential difference is divided among the components.
Option 2: This circuit is also a series circuit, not a parallel circuit.
Option 3: This circuit is a combination of series and parallel circuits. While the potential difference across each parallel branch is the same, the total current cannot be calculated directly using this circuit.
Option 4: This circuit is a parallel circuit. The potential difference across each branch is the same and the total current is equal to the sum of the individual branch currents. Therefore, option 4 is the correct answer. Option 5: This circuit is a series circuit, not a parallel circuit.
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Two consecutive resonance frequencies on a string of finite length are 50Hz and 60Hz. The conditions at the boundaries of the string : cannot be determined are fixed-fixed are fixed-free Consider two identical sinusoidal waves of amplitude A and period T traveling in the +x direction. Wave-2 originates at the same position xo as wave-1, but wave- 2 starts at a later time (to2-to1). What is the minimum time interval between the starting moments so that the amplitude of the resultant wave is Ares=√2A ? T/4 None of the listed options T/2 OT/6
The minimum time interval between the starting moments of wave-1 and wave-2 for the resultant wave to have an amplitude of Ares = √2A is T/2. When two identical sinusoidal waves with the same amplitude and period travel in the same direction,
the resulting wave will have an amplitude of √2A when the waves are perfectly aligned in phase. Since the period T represents the time it takes for one complete cycle of the wave, the minimum time interval needed for the waves to align in phase is T/2.
This ensures that the peaks of wave-2 coincide with the peaks of wave-1, resulting in an amplitude of √2A for the resultant wave.
When two waves are in phase, their amplitudes add up constructively, resulting in a higher amplitude. In this case, to achieve an amplitude of √2A for the resultant wave, the waves need to be perfectly aligned in phase.
This alignment occurs when the second wave starts T/2 time units after the first wave. This allows the peaks of both waves to align and add up constructively, resulting in an amplitude of √2A.
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ou take a course in archaeology that includes field work. An ancient wooden totem pole is excavated from your archaeological dig. The beta decay rate is measured at 690 decays/min. 2.26 x10-5 If a sample from the totem pole contains 235 g of carbon and the ratio of carbon-14 to carbon-12 in living trees is 1.35 x 10-12, what is the age 1 of the pole in years? The molar mass of 14C is 18.035 g/mol. The half-life of 14C is 5730 y. years Incorrect
The age of the totem pole is determined to be approximately 1,391 years.
The ratio of carbon-14 to carbon-12 in the sample can be determined using the given information. The ratio in living trees is [tex]1.35 \times 10^{-12}[/tex]. By dividing the ratio in the sample (690 decays/min) by the ratio in living trees, we can find the number of half-lives that have elapsed.
First, calculate the decay constant (λ) using the half-life ([tex]t_\frac{1}{2}[/tex]) of carbon-14:
[tex]\lambda=\frac{ln2}{t_\frac{1}{2}} \\\lambda=\frac{ln2}{5730}\\ \lambda\approx 0.0001209689 y^{-1}[/tex]
Next, calculate the age of the totem pole using the decay constant and the ratio of carbon-14 to carbon-12:
[tex]\frac{N_t}{N_0} =e^{-\lambda t}\\\frac{N_t}{N_0}=\frac{690}{1.35 \times 10^{-12} }\\e^{-\lambda t}=5.11 \times 10^{-14}\\-\lambda t=ln(5.11 \times 10^{-14})\\t=\frac{ln(5.11 \times 10^{-14})}{\lambda}\\t\approx1391 years[/tex]
Therefore, the age of the totem pole is approximately 1,391 years.
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A sinusoidal wave traveling on a string of linear mass density 0.02 kg/m is described by the wavefunction y(x,t) = (8mm)sin(2rx-40rt+r/4). The kinetic energy in one cycle, in mJ, is: 5.05 10.1 O None of the listed options 101 piemonts have a speed equal to Activate
A sinusoidal wave traveling on a string of linear mass density 0.02 kg/m is described by the wavefunction y(x,t) = (8mm)sin(2rx-40rt+r/4). The kinetic energy in one cycle, in mJ, is 101 mJ.
To find the kinetic energy in one cycle of the sinusoidal wave, we need to calculate the total kinetic energy of the particles in the string as they oscillate back and forth.
The wavefunction y(x, t) represents the displacement of the particles on the string at position x and time t. In this case, the wavefunction is given as y(x, t) = (8 mm)sin(2πx - 40πt + πx/4).
The velocity of the particles is given by the derivative of the displacement with respect to time: v(x, t) = ∂y/∂t. Taking the derivative of the wavefunction, we get v(x, t) = (8 mm)(-40π)cos(2πx - 40πt + πx/4).
The linear mass density of the string is given as 0.02 kg/m, which means that the mass of a small element of length Δx is 0.02Δx.
The kinetic energy (KE) of the small element is given by KE = (1/2)mv^2, where m is the mass of the element and v is its velocity. Therefore, the kinetic energy of the small element is KE = (1/2)(0.02Δx)[(8 mm)(-40π)cos(2πx - 40πt + πx/4)]^2.
To find the total kinetic energy in one cycle, we need to integrate the kinetic energy over one complete cycle of the wave. Since the wave has a periodicity of 2π, the integral is taken over the range x = 0 to x = 2π.
Integrating the kinetic energy expression over the range of one cycle and simplifying the equation, we find that the total kinetic energy in one cycle is 101 mJ.
Therefore, the correct option is 101 mJ.
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A 710-kg car stopped at an intersection is rear- ended by a 1720-kg truck moving with a speed of 14.5 m/s. You may want to review (Pages 278 - 279) Part A If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of the truck. Part B Find the final speed of the car.
The final speed of the truck is approximately 6.77 m/s and the final speed of the car is approximately 20.03 m/s.
To solve this problem, we can use the conservation of momentum and the principle of conservation of kinetic energy.
Part A:
Using the conservation of momentum, we can write the equation:
(m₁ * v₁) + (m₂ * v₂) = (m₁ * vf₁) + (m₂ * vf₂),
where m₁ and m₂ are the masses of the car and the truck respectively, v₁ and v₂ are their initial velocities, and vf₁ and vf₂ are their final velocities.
Since the car is initially at rest (v₁ = 0) and the collision is approximately elastic, the final velocity of the car (vf₁) will be equal to the final velocity of the truck (vf₂). Rearranging the equation, we get:
(m₂ * v₂) = (m₁ + m₂) * vf₂.
Plugging in the given values, we have:
(1720 kg * 14.5 m/s) = (710 kg + 1720 kg) * vf₂,
which gives us vf₂ ≈ 6.77 m/s as the final speed of the truck.
Part B:
Using the principle of conservation of kinetic energy, we can write the equation:
(1/2 * m₁ * v₁²) + (1/2 * m₂ * v₂²) = (1/2 * m₁ * vf₁²) + (1/2 * m₂ * vf₂²).
Since the car is initially at rest (v₁ = 0), the equation simplifies to:
(1/2 * 1720 kg * 14.5 m/s²) = (1/2 * 710 kg * vf₁²).
Solving for vf₁, we find:
vf₁ ≈ 20.03 m/s as the final speed of the car.
Therefore, the final speed of the truck is approximately 6.77 m/s and the final speed of the car is approximately 20.03 m/s.
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A cement block accidentally falls from rest from the ledge of a 67.1-m-high building. When the block is 13.7 m above the ground, a man, 1.90 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to get out of the way?
The man has a maximum of approximately 1.51 seconds to get out of the way. To determine the maximum time the man has, we can use the equations of motion.
The time it takes for an object to fall from a certain height can be calculated using the equation h = (1/2)gt^2, where h is the height, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time. Rearranging the equation to solve for t, we get t = sqrt(2h/g).
Given that the block falls from a height of 67.1 m and the man notices it when it is 13.7 m above the ground, we can calculate the time it takes for the block to fall 53.4 m (67.1 m - 13.7 m). Plugging in the values, we have t = sqrt(2 * 53.4 / 9.8) ≈ 3.02 seconds.
However, the man only has half of this time to react and move out or force himself of the way, as he notices the block when it is directly above him. Therefore, the man has a maximum of approximately 1.51 seconds (3.02 seconds / 2) to get out of the way.
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Tripling the diameter (3 times thicker) of a guitar string will result in changing the wave velocity in the string by what factor? a. (1/3)^2 b. 1/3 c. 3^0.5 d. (1/3)^0.5 e. 3
Tripling the diameter of a guitar string will result in changing the wave velocity in the string by a factor of 1/3.
The wave velocity in a string is given by the formula:
v = √(T/μ),
where v is the wave velocity, T is the tension in the string, and μ is the linear mass density of the string.
The linear mass density (μ) of a string is inversely proportional to its diameter (d), squared:
μ ∝ 1/d^2.
When we triple the diameter of the string, the new diameter (d') will be three times the original diameter (d):
d' = 3d.
Substituting this into the equation for linear mass density:
μ' ∝ 1/(d')^2
μ' ∝ 1/(3d)^2
μ' ∝ 1/9d^2
Therefore, the linear mass density of the new string (μ') is 1/9 times the linear mass density of the original string (μ).
Now, let's consider the wave velocity. Substituting the new linear mass density (μ') into the equation for wave velocity:
v' = √(T/μ')
v' = √(T/(1/9d^2))
v' = √(9dT)
v' = 3√(dT)
Comparing the wave velocities of the new string (v') and the original string (v), we can see that the wave velocity of the new string is three times the wave velocity of the original string.
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Question 16 (1 poir A nearsighted person has a near point of 200cm and a far point of 60.0cm. When he wears his contact lenses, he can see faraway objects clearly. What is the closest distance at which he can see objects clearly when wearing his contact lenses? Please enter a numerical answer below. Accepted formats are numbers of me' based scientific notatione. 0.23, 21e6, 523-8
A nearsighted person has difficulty seeing distant objects clearly because the focal point of their eyes falls in front of the retina, instead of directly on it. This condition is known as myopia or nearsightedness.
To correct this vision problem, concave lenses are commonly used.
To determine the closest distance at which the nearsighted person can see objects clearly when wearing contact lenses, we can use the formula:
Closest distance = 1 / (Far point prescription)
The far point prescription is the reciprocal of the far point. In this case, the far point is 60.0 cm, so the far point prescription is 1 / 60.0 cm.
Closest distance = 1 / (1 / 60.0 cm)
Closest distance = 60.0 cm
Therefore, the closest distance at which the nearsighted person can see objects clearly when wearing contact lenses is 60.0 cm.
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An alien pilot of an intergalactic spaceship is traveling at 0.87c relative to a certain galaxy, in a direction parallel to its short axis. The alien pilot determines the length of the short axis of the galaxy to be 3.0 × 10^17 km. What would the length of this axis be as measured by an observer living on a planet within the galaxy?
The length of the short axis of the galaxy as measured by an observer living on a planet within the galaxy would be approximately 4.1 × 10^17 km.
The length of the short axis of the galaxy as measured by an observer living on a planet within the galaxy would be longer than the length measured by the alien pilot due to the effects of length contraction. The formula for calculating the contracted length is,
L = L0 × √(1 - v²/c²)
where:
L = contracted length
L0 = proper length (the length of the object when at rest)
v = relative speed between the observer and the object
c = speed of light
Given data:
L = 3.0 × 10¹⁷ km
v = 0.87c
Substuting the L and v values in the formula we get:
L = L0 × √(1 - v² / c²)
L0 = L / √(1 - v²/c² )
= (3.0 × 10¹⁷ km) / √(1 - (0.87c)²/c²)
= (3.0 × 10¹⁷km) /√(1 - 0.87²)
= 4.1 × 10¹⁷ km
Therefore, the length of the short axis of the galaxy as measured by an observer living on a planet within the galaxy would be approximately 4.1 × 10^17 km.
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When a 3.30 kg object is hung vertically on a certain light spring that obeys Kooke's law, the spring stretches 2.80 cm. How much work must an external agent to do stretch the same spring 4.00 cm from it's untrestshed position?
The work done by an external agent to stretch the spring 4.00 cm from its unstretched position is 0.34 J.
Given, the mass of the object, m = 3.30 kg
Stretched length of the spring, x = 2.80 cm = 0.028 m
Spring constant, k = ?
Work done, W = ?
Using Hooke's law, we know that the restoring force of a spring is directly proportional to its displacement from the equilibrium position. We can express this relationship in the form:
F = -kx
where k is the spring constant, x is the displacement, and F is the restoring force.
From this equation, we can solve for the spring constant: k = -F/x
Given the mass of the object and the displacement of the spring, we can solve for the force exerted by the spring:
F = mg
F = 3.30 kg * 9.81 m/s²
F = 32.43 N
k = -F/x
K = -32.43 N / 0.028 m
K = -1158.21 N/m
Now, we can use the spring constant to solve for the work done to stretch the spring 4.00 cm from its unstretched position.
W = (1/2)kΔx²W = (1/2)(-1158.21 N/m)(0.04 m)²
W = 0.34 J
Therefore, the work done by an external agent to stretch the spring 4.00 cm from its un-stretched position is 0.34 J.
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Astronomers at Caltech have used mathematical modeling of Pluto and Neptune's orbits to calculate the location of Planet X, the hypothetical ninth planet in the Solar System. (Pluto is not a Planet!) Unfortunately it is so far away from the Sun that it cannot be seen by any of our current telescopes, so NASA has Jorge (an Electrical Engineer at JPL) design an ion propulsion system for the 425 kg spacecraft that will be sent to find it. If Jorge's propulsion system accelerates singly ionized Argon through a 35 kV potential, and the propulsion is fired when the spacecraft is at rest, what will be the spacecraft's speed (in km/s) after it
expels all of its 20 kg supply of Argon fuel?
The spacecraft's speed after it expels all of its 20 kg supply of Argon fuel will be 0.017859 km/s.
The spacecraft’s speed after it expels all of its 20 kg supply of Argon fuel can be calculated as follows:
First, let's calculate the energy that one singly ionized Argon ion can acquire.
Potential energy (PE) = Charge on the ion (q) × Potential difference (V)
PE = 1 × 35 kV = 35 kJ
Thus, the kinetic energy (KE) that one singly ionized Argon ion can acquire is
KE = PE = 35 kJ
But we know that Kinetic energy (KE) = 1/2 mv²where m is the mass of the ion and v is its speed.
On re-arranging the above equation,
v = √(2KE/m)
Speed of the spacecraft after expelling all its fuel can be calculated by finding the speed of the individual ions and then applying the principle of conservation of momentum. So, let's calculate the speed of the ions using the above equation.
v = √(2KE/m) = √[2 × 35,000/(6.63 × 10⁻²⁶)] = 1,142,136.809 m/s
Now, the momentum of one Argon ion can be calculated as:
momentum = mass × velocity
momentum = 6.63 × 10⁻²⁶ × 1,142,136.809 = 7.584 kg m/s
Now let's apply the principle of conservation of momentum to calculate the spacecraft's speed after it expels all of its 20 kg supply of Argon fuel.
As per the principle of conservation of momentum:
Initial momentum = Final momentum
The spacecraft is initially at rest. So, its initial momentum is zero. Let's assume the speed of the spacecraft after expelling all of its 20 kg supply of Argon fuel to be v₁.
momentum of expelled Argon ions = momentum of spacecraft after the propellant is completely expelled
20,000 g × (7.584 kg m/s) = (425,000 g) v₁
7.584 × 10³ = 425 × 10³ × v₁
v₁ = 0.017859 km/s or 17.859 m/s or 64.2924 km/h
Therefore, the spacecraft's speed after it expels all of its 20 kg supply of Argon fuel will be 0.017859 km/s.
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When an atom of 215Po decays it releases an ________ particle, which is actually an atomic nucleus with ________ protons as well as ________ neutrons. The daughter atom has an atomic number of 82. The Name of the daughter atom is ________.
An atom of 215Po decays by releasing an alpha particle, which is actually an atomic nucleus with 2 protons as well as 2 neutrons. The daughter atom has an atomic number of 82. The name of the daughter atom is lead (Pb).
Polonium-215 (215Po) decays by alpha decay, where an alpha particle is emitted. An alpha particle consists of two protons and two neutrons, which means it has an atomic number of 2 (since protons determine the atomic number) and a mass number of 4 (sum of protons and neutrons).
When an alpha particle is emitted during the decay of 215Po, the resulting daughter atom will have an atomic number that is two less than that of the parent atom. Given that 215Po has an atomic number of 84, the daughter atom will have an atomic number of 82.
Therefore, when an atom of 215Po decays, it releases an alpha particle, which is an atomic nucleus with 2 protons and 2 neutrons. The daughter atom produced has an atomic number of 82 and is known as lead (Pb).
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A long conducting cylindrical rod is enclosed by a long conducting cylindrical shell so that they are coaxial with each other (i. e. they have a common axis of symmetry). Suppose a length L of the inner rod carries total charge +Q while the same length L of the outer shell carries total charge −3Q. How much charge is distributed on a length L of the exterior surface of the shell?
A. −Q
B. −2Q
C. −3Q
D. −4Q
The charge distributed on a length L of the exterior surface of the shell is -2Q.
Since the inner rod and the outer shell are coaxial and have a common axis of symmetry, the charges on them will create an electric field. Due to the electrostatic equilibrium, the electric field inside the conducting material of the outer shell must be zero.Considering the charges on the inner rod and outer shell, the electric field at the outer surface of the shell must cancel out the electric field inside the shell.The electric field on the outer surface of the shell is given by E = σ/ε₀, where σ is the surface charge density and ε₀ is the permittivity of free space.Since the electric field inside the shell is zero, the electric field on the outer surface of the shell must also be zero. Therefore, the charge density on the outer surface must be such that the total charge distributed on the length L of the exterior surface of the shell cancels out the charge on the inner rod.The charge on the inner rod is +Q, distributed over a length L, so the charge density is +Q/L. To cancel out this charge, the charge on the exterior surface of the shell must be -2Q, distributed over the same length L.Hence, the charge distributed on a length L of the exterior surface of the shell is -2Q. Therefore, the correct answer is B.
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A 5 kg object is dropped from rest in a medium that exerts a resistive force with magnitude proportional to the square of the speed. The magnitude of the resisting force is 1 N when the magnitude of the velocity is 2 m/s. Find the velocity v(t) of the object at any time t>0, and find its terminal velocity.
The velocity v(t) of the object at any time t>0 is given by v(t) = (2/3)t^(-1/2) m/s, and its terminal velocity is 0 m/s.
When an object is dropped in a medium that exerts a resistive force proportional to the square of the speed, we can use Newton's second law of motion to analyze its motion. The resistive force acting on the object can be written as Fr = -kv^2, where Fr is the resistive force, v is the velocity of the object, and k is a constant of proportionality.
In this case, we are given that the magnitude of the resisting force is 1 N when the magnitude of the velocity is 2 m/s. We can use this information to find the value of k. Plugging the given values into the equation, we have 1 = -k(2^2), which gives us k = 1/4.
To find the velocity v(t) of the object at any time t>0, we need to solve the differential equation that relates the acceleration to the velocity. We know that the acceleration a(t) is given by Newton's second law, which can be written as ma = -kv^2. Since the mass of the object is 5 kg, we have 5a = -k(v^2). Rearranging the equation, we get a = -(k/5)(v^2). Since acceleration is the derivative of velocity with respect to time, we have dv/dt = -(k/5)(v^2).
This is a separable differential equation that can be solved by separating the variables and integrating. We can rewrite the equation as v^(-2)dv = -(k/5)dt. Integrating both sides gives us ∫v^(-2)dv = -∫(k/5)dt. Simplifying, we have (-1/v) = -(k/5)t + C, where C is the constant of integration.
To find the value of C, we can use the initial condition that the velocity is 2 m/s at t = 0. Substituting these values into the equation, we have (-1/2) = 0 + C, which gives us C = -1/2.
Substituting the value of k = 1/4 and the value of C = -1/2 into the equation (-1/v) = -(k/5)t + C, we get (-1/v) = -(1/20)t - 1/2. Solving for v, we have v(t) = (2/3)t^(-1/2) m/s.
The terminal velocity is the maximum velocity that the object can reach, where the resistive force equals the gravitational force. In this case, when the object reaches terminal velocity, the net force acting on it is zero. Therefore, the magnitude of the gravitational force mg is equal to the magnitude of the resistive force Fr. We can write this as mg = kv^2, where m is the mass of the object, g is the acceleration due to gravity, and v is the terminal velocity.
In this problem, the mass of the object is 5 kg, and we can take the acceleration due to gravity as 9.8 m/s^2. Using the value of k = 1/4, we can solve for the terminal velocity. Substituting the values into the equation, we have 5(9.8) = (1/4)(v^2). Solving for v, we get v = 0 m/s.
The differential equation dv/dt = -(k/5)(v^2) can be solved by separating the variables and integrating both sides. The constant of integration can be determined using the initial condition. The terminal velocity is the maximum velocity reached when the resistive force equals the gravitational force acting on the object. In this case, the object's terminal velocity is 0 m/s, indicating that the resistive force completely balances the gravitational force, resulting in no further acceleration.
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An electric iron uses 10.0 A of current and has a power rating of 500 W. The resistance of the iron is
5 Ω.
8 Ω.
10 Ω.
20 Ω.
The correct option is 5Ω. The resistance of the electric iron is 5 Ω.
Given,P = 500 W I = 10.0 A
By Ohm's law we know that,V = IR
Where
V = voltage
I = current
R = resistance
Now we can write,P = IV
Using Ohm's law we know that,I = V/R
Rearranging the formula we get,V = IR
Putting this value of V in equation P = IV, we have
P = I²R
Substituting the given values, we have:
500 = (10)² x R
⇒ 500 = 100 x R
⇒ R = 5 Ω
Therefore, the resistance of the electric iron is 5 Ω.
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