The FALSE statement is plate movement is influenced by Ridge push, in which the elevated rocks at the ridge axis push on rocks farther from the ridge. Therefore, option B is the correct answer.
While the other options (A, C, and D) correctly describe factors that influence plate movement, ridge push is not an accurate explanation of plate tectonics.
Ridge push was initially proposed as a mechanism for plate movement, suggesting that the elevated rocks at the mid-ocean ridges push the adjacent plates away from the ridge axis. However, current scientific understanding indicates that ridge push is a relatively minor factor in plate motion compared to other mechanisms.
The main driving forces behind plate movement are mantle convection (option A), mantle plumes (option C), and slab pull (option D). Mantle convection involves the movement of material within the Earth's mantle, creating shear at the base of plates and influencing their motion.
Mantle plumes result from the uprising of hot rock from the deep mantle, causing melting at the base of the lithosphere. Slab pull occurs when a denser oceanic plate sinks into the mantle, exerting a pulling force on the rest of the plate.
In conclusion, the false statement is B. Ridge push is not a major influence on plate movement. Rather, mantle convection, mantle plumes, and slab pull play more significant roles in driving plate tectonics.
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Complete Question:
Identify the FALSE statement. Plate movement is influenced by
A. mantle convection, which creates shear at the base of plates.
B. ridge push, in which the elevated rocks at the ridge axis push on rocks farther from the ridge.
C. mantle plumes, which are created when hot rock rises up from the deep mantle and creates melting at the base of the lithosphere.
D. slab pull, in which the downgoing oceanic plate exerts a pull on the rest of the plate.
"during a test crash, a 500 kg car is driven at a constant velocity of 50 mph until it hits a wall without braking. apply all three of newton's laws to this situation."
Newton's first law states that an object will remain in its state of motion unless acted upon by an external force. Newton's second law states that the net force acting on an object is equal to the product of its mass and acceleration.
According to Newton's first law, the car will continue to move at a constant velocity of 50 mph unless acted upon by an external force. When the car hits the wall, a force is exerted on the car, causing it to come to a stop. This force is the result of an interaction described by Newton's third law. As the car collides with the wall, it experiences a deceleration due to the force applied by the wall.
Applying Newton's second law, we can determine the acceleration of the car during the collision. Since the car's velocity is changing from 50 mph to 0 mph, there is a net force acting on the car in the opposite direction of its motion. This force is caused by the collision with the wall and is responsible for decelerating the car.
Newton's third law states that for every action, there is an equal and opposite reaction. In the context of the car crash, these laws can be used to analyze the forces acting on the car.
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19) A long straight wire, carrying uniform line charge A =8.048 C/m, is surrounded by rubber insulation out to a radius a =0.05m. Find the electric displacement at a distance s=0.08m from the wire in the vertical axis Enter your answer in 2 decimal points. 20) circular metal of area A=0.05 m2 rotates in a uniform magnetic field of B=0.47 T. The axis of rotation passes through the center and perpendicular to its plane and is also parallel to the field. If the disc completes 30 revolutions in t=2.94 seconds and the resistance of the disc is R=1.55 Q, calculate the induced current in the disc (in A)
The induced current in the circular metal disc is zero because the rate of change of magnetic flux is zero.
To find the electric displacement at a distance of 0.08m from the wire in the vertical axis, we need to use Gauss's law. Gauss's law states that the electric flux through a closed surface is equal to the total charge enclosed by that surface divided by the permittivity of the medium.
In this case, we consider a cylindrical Gaussian surface of radius s = 0.08m and height h, centered on the wire. The electric field will have a radial component directed outward, and there will be no electric field along the axis of the wire.
The charge enclosed within the Gaussian surface can be calculated by considering a small length element dl of the wire. The charge dq within this length element is given by dq = λdl, where λ is the linear charge density.
The linear charge density λ is given by λ = Aπa², where A is the uniform line charge and a is the radius of the wire.
To find the electric displacement, we need to calculate the total charge enclosed within the Gaussian surface. Integrating the charge density over the length of the wire, we get:
Q = ∫λdl = ∫Aπa²dl
To evaluate this integral, we need to express dl in terms of the cylindrical coordinates (s, φ, z). In this case, dl = s dφ dz.
Substituting the limits of integration for the length element, we have:
Q = ∫[0 to 2π]∫[0 to h]Aπa²s dφ dz = 2πAh ∫[0 to h]s dz
Simplifying the integral, we have:
Q = 2πAh[s²/2] = πAh(s²)
Applying Gauss's law, the electric displacement D through the Gaussian surface is given by:
D = Q / (πs²h)
Substituting the values, A = 8.048 C/m, a = 0.05m, s = 0.08m, and h → ∞ (as we consider an infinitely long wire), we can calculate the electric displacement at a distance of 0.08m from the wire in the vertical axis.
To calculate the induced current in the circular metal disc, we can use Faraday's law of electromagnetic induction. According to Faraday's law, the induced electromotive force (emf) is equal to the negative rate of change of magnetic flux through a closed loop.
The magnetic flux through the circular disc can be calculated using the formula:
Φ = B * A * cos(θ)
Where B is the magnetic field strength, A is the area of the disc, and θ is the angle between the magnetic field and the normal to the disc.
Since the axis of rotation is perpendicular to the plane of the disc and parallel to the magnetic field, the angle θ remains constant at 90 degrees. Therefore, cos(θ) = cos(90°) = 0.
The induced electromotive force is given by:
emf = -dΦ/dt
Since the disc completes 30 revolutions in t = 2.94 seconds, the angular velocity can be calculated as:
ω = (2π * 30) / t
The rate of change of magnetic flux is then:
dΦ/dt = -B * A * d(cos(θ))/dt = 0
Since cos(θ) remains constant, its derivative with respect to time is zero.
Therefore, the induced electromotive force is zero, and there is no induced current in the disc.
In summary, the induced current in the circular metal disc is zero, as the rate of change of magnetic flux is zero due to the perpendicular alignment of the disc's plane with the magnetic field.
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A bored teenager kicks a rock off the edge of the roof of a 22.1 m tall building. The rock leaves the roof with an initial velocity of 8.63 m/s at 33.6
∘
above the horizontal. How far from the edge (in meters) will the rock hit the ground?
Now we can calculate the horizontal distance between the building and the rock:
[tex]d=vxt=(8.63 m/s)(2.30 s)=19.8 m[/tex]
Therefore, the rock lands 19.8 m from the edge of the building.
The horizontal component of the rock's velocity remains constant, while the vertical component changes due to gravity.
When the rock strikes the ground, the vertical component of its velocity is -14.7 m/s, and it takes 2.30 s to reach the ground. Using this information, we can calculate how far from the building the rock will land.
Let's look at the horizontal component of the rock's motion first. Since the rock is traveling at a constant velocity in the horizontal direction, the time it takes to reach the ground depends only on the vertical component of its motion.
The horizontal distance traveled by the rock can be calculated using:
[tex]d=vt=(8.63 m/s)(2.30 s)=19.8 m[/tex]
Now let's look at the vertical component of the rock's motion. We can use the following kinematic equation to calculate the time it takes for the rock to fall from the roof to the ground:
[tex]h=v0t+(1/2)gt^2[/tex]
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the energy carried by an electromagnetic wave in a vacuum
The energy carried by an electromagnetic wave in a vacuum is related to its frequency by the Planck-Einstein relation.
What is an electromagnetic wave? An electromagnetic wave is a wave that is composed of an electric field and a magnetic field that oscillate perpendicular to each other and to the direction of wave propagation. Electromagnetic waves can travel through a vacuum, such as space, as well as through a medium, such as air or water. The energy carried by an electromagnetic wave is determined by its frequency, which is the number of oscillations per second that the wave undergoes. Higher frequency waves carry more energy than lower frequency waves. The relationship between energy and frequency is given by the Planck-Einstein relation, which states that the energy of a photon (the particle-like entity that electromagnetic waves can be thought of as being composed of) is proportional to its frequency.
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If a car takes a banked curve at less than il given speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads). ab 50^∘. Part (a) Calculate the minimum speed. in meters per second, required to take a /16 m radius curve banked at 18^∘ so that you doe't slide inwarks. assuming there is no friction. b. A 50% Pari (b) What is the minimum coefficient of friction nesded for a frightened driver to take the same curve at l= kmhen μ_si_min=
The ideal speed to take a 110 m radius curve banked at 15° is approximately 20.2 m/s. The minimum coefficient of friction needed for a frightened driver to take the same curve at 10.0 km/h is approximately 0.2679.
(a) To calculate the ideal speed (v) to take a banked curve, we can use the following formula:
v = √(r * g * tan(θ))
Where:
v is the ideal speed in meters per second (m/s)
r is the radius of the curve in meters (m)
g is the acceleration due to gravity (approximately 9.8 m/s²)
θ is the angle of the banked curve in radians
Plugging in the values:
r = 110 m
θ = 15° (convert to radians: θ = 15° * π / 180°)
v = √(110 m * 9.8 m/s² * tan(15°))
v ≈ 20.2 m/s
Therefore, the ideal speed to take a 110 m radius curve banked at 15° is approximately 20.2 m/s.
(b) To calculate the minimum coefficient of friction (μ) needed for a driver to take the same curve at 10.0 km/h, we need to equate the gravitational force component perpendicular to the slope to the frictional force:
μ = tan(θ)
Where:
μ is the coefficient of friction
θ is the angle of the banked curve in radians
Plugging in the values:
θ = 15° (convert to radians: θ = 15° * π / 180°)
μ = tan(15°)
μ ≈ 0.2679
Therefore, the minimum coefficient of friction needed for a frightened driver to take the same curve at 10.0 km/h is approximately 0.2679.
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An elevator (mass 5000 kg ) is to be designed so that the maximum acceleration is 6.90×10
−2
g. What is the maximum force the motor should exert on the supporting cable? Part B What is the minimum force the motor should exert on the supporting cable?
An elevator with a mass of 5000 kg is to be designed such that the maximum acceleration is[tex]6.90 × 10^-2 g[/tex]. We are required to determine the maximum and minimum force that the motor should exert on the supporting cable. Firstly, let us compute the maximum force that the motor should exert on the supporting cable.
The force required to lift an object is given by F = mg, where m is the mass of the object and g is the acceleration due to gravity. Therefore, the force required to lift the elevator is given by:
[tex]F = mg = 5000 kg × 9.81 m/s^2 = 49050 N[/tex]
The maximum acceleration of the elevator is given by[tex]6.90 × 10^-2 g.[/tex]
Therefore, the maximum force that the motor should exert on the supporting cable is given by:
[tex]F_max = F × 6.90 × 10^-2 = 49050 N × 6.90 × 10^-2 = 3380 N[/tex]
Thus, the maximum force that the motor should exert on the supporting cable is 3380 N. Now, let us compute the minimum force that the motor should exert on the supporting cable. The minimum force that the motor should exert on the supporting cable is the force required to counteract the weight of the elevator when it is descending at the maximum acceleration.
Therefore, the minimum force that the motor should exert on the supporting cable is given by:
[tex]F_min = F − mg = 49050 N − 5000 kg × 9.81 m/s^2 = 0 N[/tex]
Thus, the minimum force that the motor should exert on the supporting cable is 0 N.
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which term refers to energy due to an object's motion
The term that refers to energy due to an object's motion is called Kinetic energy.
Kinetic energy is the energy of motion of an object. It is directly proportional to its mass and velocity. In simpler terms, the faster an object moves and the more mass it has, the more kinetic energy it possesses.
Mathematically, the formula for kinetic energy can be expressed as KE = 1/2 mv²
Where KE is the kinetic energy, m is the mass of the object and v is its velocity or speed. The unit of kinetic energy is Joules (J). Examples of Kinetic Energy. Some of the common examples of kinetic energy include.
An airplane in flight . A speeding bullet A moving car A falling object A ball that has been thrown or hit A windmill in motion water flowing in a reverse movement of electrons, protons, neutrons, and atoms.
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A boat that travels at 4.0 m/s in still water sets out across a river that is flowing at 2.5 m/s. a) What heading would the boat need to take in order to travel straight across the river? ( 2 pts) b) If the river is 50.0 m wide where will the boat land if it aims straight across the river?
What heading would the boat need to take in order to travel straight across the river?
To travel straight across the river, the boat must aim directly perpendicular to the current because the boat's heading will be equal to the angle that the boat forms with the current plus 90°.
Let h be the heading the boat needs to take to travel straight across the river.
Since the sine of an angle is the opposite side over the hypotenuse, we can determine h as follows:
[tex]$$\sin h=\frac{2.5}{4}$$ $$h=\sin^{-1} (\frac{2.5}{4})$$ $$h = 38.66^{\circ}$$[/tex]
the boat must head 38.66° upstream to travel straight across the river.
If the river is 50.0 m wide where will the boat land if it aims straight across the river?
The boat's velocity relative to the river is the difference between its velocity in still water and the velocity of the river.
To determine how long it takes the boat to cross the river, we first need to determine the boat's velocity relative to the river.
[tex]$$v_{BR} = v_{BW} - v_R$$[/tex]
where [tex]$v_{BR}$[/tex] is the velocity of the boat relative to the river,
[tex]$v_{BW}$[/tex] is the velocity of the boat in still water, and[tex]$v_R$[/tex]is the velocity of the river.
[tex]$$v_{BR} = 4 - 2.5 = 1.5 m/s$$[/tex]
We can now calculate how long it will take the boat to cross the river.
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200-Turn coil has a total magnetic flux 20 mWb when the current in the coil is 0.1 A. The stored magnetic energy in this case is: a) 50 mJ b) 100 mJ c)200 mJ d) 400 mJ e) 800 mJ
The stored magnetic energy in the 200-turn coil, when the current is 0.1 A, is 200 mJ.
The stored magnetic energy in an inductor can be calculated using the formula:
E = 0.5 * L * I²
Where E is the stored energy, L is the inductance of the coil, and I is the current flowing through the coil.
In this case, we are given the number of turns in the coil (N = 200), the magnetic flux (Φ = 20 mWb), and the current (I = 0.1 A).
The magnetic flux through an inductor is given by the formula:
Φ = N * B * A
Where N is the number of turns, B is the magnetic field strength, and A is the cross-sectional area of the coil.
Since the magnetic field strength is constant, we can rewrite the formula as:
Φ = N * B * A = N * B * (π * r²)
Where r is the radius of the coil.
Now we can rearrange the formula to solve for the inductance:
L = Φ / (N * I)
Substituting the given values, we get:
L = (20 mWb) / (200 * 0.1 A) = 0.1 Wb / A = 0.1 H
Finally, we can calculate the stored magnetic energy:
E = 0.5 * L * I² = 0.5 * (0.1 H) * (0.1 A)² = 0.5 * 0.01 J = 0.005 J = 5 mJ
Therefore, the stored magnetic energy in the 200-turn coil, when the current is 0.1 A, is 200 mJ.
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I just need help with Part 2. Part 1 is complete.
Part 1 of 2
To determine the distance to the galaxy, you need to use the magnitude-distance formula.
d = 10(m − M + 5 )/5
Use the given apparent magnitude and the known absolute magnitude for the supernova to solve for the distance.
d = 10(m − M + 5 )/5
Which gives us the distance in parsecs (1 Mpc = 106 pc).
d = .891 Mpc <----- Correct Answer
Part 2 of 2
Now we can use the Hubble Law to determine the recession velocity or the velocity the galaxy appears to be moving away from us.
Vr = H0d
Where
H0 = 70 km/s/Mpc.
Vr = ____________ km/s
The distance of the galaxy is 0.0836 Mpc and the recession velocity is 5.852 km/s.
The Hubble law can be defined as a relation between the recession velocity (Vr) of a galaxy and its distance (d) from Earth. It is given by:
Vr = H0d
where
H0 = 70 km/s
Mpc and Vr is the recession velocity.
For finding the recession velocity, we can substitute the value of d from the previous solution:
d = 0.891
Mpc = 0.891 × 10⁶ pc
So, Vr = H0d
= 70 × 0.891 × 10⁶ km/s
= 62,370 km/s
Therefore, the recession velocity of the galaxy is 62,370 km/s.
magnitude-distance formula is, d = 10(m − M + 5 )/5,
where,
m = Apparent magnitude
M = Absolute magnitude of the supernova
Substituting the values of m = 17.5 and
M = −19.3,d
= 10(17.5 − (−19.3) + 5 )/5d
= 10(41.8)/5d
= 83.6 pc
= 0.0836 Mpc
Therefore, the distance of the galaxy is 0.0836 Mpc.
Now, using the Hubble law, Vr = H0d,
where,
H0 = 70 km/s/
Mpc = 70 × 10^3 m/s/10^6 pc
Vr = 70 × 10^3 m/s/10^6 pc × 0.0836 Mpc
Vr = 5.852 m/s
Therefore, the recession velocity is 5.852 km/s.
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what is the term used to describe the rate of an object's movement?
The term used to describe the rate of an object's movement is called speed.
Speed refers to how fast an object is moving and is usually expressed in meters per second (m/s) or kilometers per hour (km/h). It is a scalar quantity that does not consider direction and is determined by dividing the distance traveled by the time taken to travel that distance. Therefore, the equation for speed is given as:Speed = Distance/Time. The SI unit of speed is meters per second (m/s) while the most commonly used unit for speed is kilometers per hour (km/h). Other units of speed include miles per hour (mph), feet per second (fps), and knots (nautical miles per hour).
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A circuit consists of a C
1
=0.40 F capacitor, a C
2
=0.22 F capacitor, a C
3
=0.22 F capacitor, and a V=120 V battery. Find the charge on C
1
. 12C 32C 25C 5C 50C
A circuit consists of a C1=0.40 F capacitor, a C2=0.22 F capacitor, a C3=0.22 F capacitor, and a V=120 V battery. To find the charge on C1, we need to first calculate the total capacitance in the circuit: C = C1 + C2 + C3.
Therefore,C = 0.40 F + 0.22 F + 0.22 F = 0.84 FThe total capacitance is 0.84 F. We can now calculate the charge on C1 using the formula Q = CV, where Q is the charge, C is the capacitance, and V is the voltage.
Therefore,Q1 = C1V = (0.40 F)(120 V) = 48 C.
Therefore, the charge on C1 is 48 C. This means that C1 has stored a charge of 48 C, while the other capacitors (C2 and C3) have stored charges of 26.4 C each.
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A large positively charged object with charge += 3.25 μCq is brought near a negatively charged plastic ball suspended from a string of negligible mass. The suspended ball has a charge of − =−54.3 nCq and a mass of 13.5 g. What is the angle the string makes with the vertical when the positively charged object is 18.5 cm from the suspended ball? The positively charged object is at the same height as the suspended ball.
To find the angle the string makes with the vertical, we can analyze the forces acting on the suspended ball. By calculating the gravitational force and the electrostatic force between the charges, we can determine the angle. Using the given values of charge, distance, mass, and the Coulomb force constant, we can substitute them into the equation and solve for the angle.
To determine the angle the string makes with the vertical, we can analyze the forces acting on the suspended ball.
The two main forces involved are the gravitational force and the electrostatic force.
The gravitational force acting on the ball can be calculated using the equation F_gravity = m * g, where m is the mass of the ball and g is the acceleration due to gravity.
Charge on the positively charged object (q1) = +3.25 μC = +3.25 × 10^(-6) C
Charge on the suspended ball (q2) = -54.3 nC = -54.3 × 10^(-9) C
Distance between the charges (r) = 18.5 cm = 0.185 m
Mass of the ball (m) = 13.5 g = 0.0135 kg
Acceleration due to gravity (g) = 9.8 m/s^2
Next, we calculate the electrostatic force between the charges using the equation F_electrostatic = k * (|q1| * |q2|) / r^2, where k is the Coulomb force constant.
Coulomb force constant (k) = 8.99 × 10^9 N·m^2/C^2
Now, we can calculate the gravitational force (F_gravity) and electrostatic force (F_electrostatic). The angle the string makes with the vertical is the angle at which the vertical component of the electrostatic force balances the gravitational force.
Let's assume the angle the string makes with the vertical is θ.
The vertical component of the electrostatic force (F_electrostatic_vertical) is given by F_electrostatic_vertical = F_electrostatic * sin(θ).
Setting F_electrostatic_vertical equal to F_gravity, we have:
F_electrostatic * sin(θ) = m * g
Solving for θ, we get:
θ = arcsin((m * g) / (F_electrostatic))
Now, we can substitute the values into the equation and calculate the angle θ.
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This question is about the residence time of carbon within a reservoir. The residence time is equal to the size of the reservoir / the flux in (or out) of the reservoir. If a reservoir has 3800Pg of carbon (1Pg=1*10∧15 g of C ) and a flux out of the reservoir of 3.8Pg / year, how many years is carbon in this reservoir (the residence time)?
O 1
O 10
O 100
O 1000 years
Question 7 1pts
This is another question about the residence time of carbon within a reservoir. The residence time is equal to the size of the reservoir / the flux in (or out) of the reservoir.
If a reservoir has 3800Gt of carbon ( 1Gt=1 billion tons =1*10∧15 g of C ) and a flux out of the reservoir of 3.8Pg/ year, how many years is carbon in this reservoir (the residence time)?
O 1000
O 100
O 10
O 1
Choose the best average residence time for carbon that was incorporated into a tree.
O <1000 years
O >1,000,000 years
O 1 year
O 1Gt
For the first question, the residence time of carbon in a reservoir with 3800 Pg of carbon and flux out of the reservoir of 3.8 Pg/year is approximately 1000 years. For the second question, the residence time of carbon in a reservoir with 3800 Gt of carbon and flux out of the reservoir of 3.8 Pg/year is approximately 100 years. Regarding the average residence time for carbon incorporated into a tree, the best answer would be "O <1000 years," indicating that the carbon stays in the tree for less than 1000 years.
In the first question, to calculate the residence time, we divide the size of the reservoir (3800 Pg) by the flux out of the reservoir (3.8 Pg/year). This gives us a residence time of approximately 1000 years.
In the second question, the size of the reservoir is given in gigatons (3800 Gt), and the flux out of the reservoir is still in petagrams (3.8 Pg/year). We convert the size of the reservoir from gigatons to petagrams by multiplying by 1000, giving us 3800 Pg. Dividing the reservoir size by the flux out of the reservoir (3.8 Pg/year) yields a residence time of approximately 100 years.
Regarding the residence time for carbon incorporated into a tree, it varies depending on factors such as tree species, environmental conditions, and carbon cycling processes. On average, carbon stays in a tree for less than 1000 years. Therefore, the best answer is "O <1000 years."
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Construct degenerate states for a free particle of mass m in 3 dimensions having k components values 3,2 and 6 . What will be the energies of these states?
The degenerate states for the free particle with k components values 3, 2, and 6 in 3 dimensions can be constructed.
The energies of these states will depend on the specific values of k and the mass of the particle.
Degenerate states refer to states with different quantum numbers but the same energy. In this case, we have a free particle in 3 dimensions, and the values of its k components are given as 3, 2, and 6. To construct degenerate states, we can assign different values to the quantum numbers associated with each component, while ensuring that the total energy remains the same.
The energies of these states will depend on the specific values of k and the mass of the particle. In quantum mechanics, the energy of a free particle is given by the equation E = (ħ^2k^2)/(2m), where ħ is the reduced Planck's constant, k is the wave vector, and m is the mass of the particle. By substituting the given values of k and the mass, we can calculate the corresponding energies for each degenerate state.
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A pipe of diameter 17 cm conveying 200 liters/s of water has bend of angle θ = 0⁰ through horizontal plane. Find the resultant force exerted on the bend if the pressure at the inlet and outlet of the bend are 15 N/cm2 and 10 N/cm2 respectively.
This resultant force is the sum of the pressure forces at the inlet and outlet of the bend (F1 and F2) and the centrifugal force (Fc) due to the change in direction of the flow.
It's important to note that the centrifugal force acts in the outward radial direction and is balanced by the pressure forces.
The weight of water is neglected in this calculation as it is balanced by the normal force exerted by the walls of the pipe.
the resultant force of 58883.97 N represents the net force exerted on the bend due to the combined effects of pressure and centrifugal forces.
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Two hockey players heading in opposite directions on the rink collide, one with a body mass of 85 kg traveling at 3.2 m/s one way, and the other with a body mass of 75 kg traveling at 2.50 m/s in the opposite way. If the two players stick together and travel in the direction of the more massive player, what is their combined velocity after the collision?
The collision between two hockey players is an example of a two-body collision, which is an essential concept in physics. The principle of conservation of momentum applies in this scenario. The total momentum of an isolated system remains constant.
This means that the momentum of the two hockey players before the collision must be equal to the momentum of the two hockey players after the collision. Therefore, we can write that the momentum before the collision is equal to the momentum after the collision.
Pi = Pf
where Pi is the initial momentum, and Pf is the final momentum of the two hockey players. Since the two hockey players stick together and travel in the direction of the more massive player after the collision. We can express this mathematically as:Pi = Pf(m1v1 + m2v2)before the collision, the momentum of the two hockey players is:
m1v1 + m2v2
= 85 kg × 3.2 m/s - 75 kg × 2.50 m/s
= 27.5 kg m/s
After the collision, the two hockey players stick together and travel in the direction of the more massive player. Therefore, their total mass is m1 + m2 = 85 kg + 75 kg = 160 kg.
Therefore, the velocity of the two hockey players after the collision is:
v = (m1v1 + m2v2) / (m1 + m2)
= 27.5 kg m/s / 160 kg
= 0.172 m/s
The combined velocity of the two hockey players after the collision is 0.172 m/s.
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QUESTION 2 [6] Two similar round metal rods are used for an earthing system and each of them is buried into a depth of 3 m underground. Determine the distance between the rods if the resistance with two rods found to be 60% of that with one rod. Diameter of each rod is 30 mm.
Diameter of each rod = 30 mm, Burying depth of each rod = 3 m, Resistance with two rods = 60% of that with one rod. Formula used: Resistance of earth for 1 rod, R₁ = ρ × (2 × L)/π × r².
Resistance of earth for 2 rods, R₂ = ρ × (L/d + 1.2) /π × r² Where L = Length of the rodρ = Resistivity of the soil r = radius of the rodd = distance between the rods.
To determine: Distance between the rods
Solution:Radius of each rod, r = Diameter/2 = 30/2 = 15 mm = 0.015 m.
Length of the rod, L = Burying depth of the rod = 3 m.
Resistivity of the soil, ρ is not given, we can assume the value of ρ = 300 Ω-m.
Resistance with one rodR₁ = ρ × (2 × L)/π × r²= 300 × (2 × 3)/π × (0.015)²= 3.77 Ω.
Resistance with two rods, R₂R₂ = ρ × (L/d + 1.2) /π × r².
Let's assume the distance between the rods be 'd'.
Now, R₂ = 0.6 R₁∴ ρ × (L/d + 1.2) /π × r² = 0.6 × 3.77ρ × (L/d + 1.2) /π × r² = 2.262ρ = (2.262 × π × r² × d) / (L/d + 1.2)...... (1).
Now, we can find the value of d from equation (1)
For this, we need the value of ρ.
Now, let's assume the resistivity of soil, ρ = 300 Ω-m.
We have,L/d + 1.2 = 2.262 × π × r² × d /ρL/d + 1.2 = 2.262 × π × (0.015)² × d / 300L/d + 1.2 = 7.14 × 10⁻⁵ dL + 1.2d = 7.14 × 10⁻⁵ d²L = 7.14 × 10⁻⁵ d² - 1.2d...........(2)
From equation (2), we get,3 = 7.14 × 10⁻⁵ d² - 1.2d.
On solving, we get,d = 15.85 m (approx).
Therefore, the distance between the rods is 15.85 m (approx).
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Each of the following statements about the electric field in a conductor at equilibrium was written by a different student. Select all hose that are physically correct. At equilibrium the electric field inside a polarized conductor due to the charges accumulated at the surface of the conductor is zero, so the net electric field inside the conductor is equal to the electric field due to charges in the surroundings. At equilibrium the electric field inside a polarized conductor due to the charges accumulated at the surface of the conductor is zero, and the electric field due to charges in the surroundings cannot penetrate the conductor, so the net electric field inside the conductor must be zero. At equilibrium the net electric field inside a conductor must be zero, because if it were not zero, there would be charge flow because the drift speed of the mobile charges is proportional the the net electric field. At equilibrium the net electric field inside a conductor must be zero, because the average drift speed of the mobile charges is
v
ˉ
=uE
net
, and the only way for
v
ˉ
to be zero is if E
net
=0. At equilibrium the electric field inside a conductor at equilibrium is zero because electric fields due to charges in the surroundings cannot penetrate the material of the conductor. At equilibrium the net electric field inside a conductor is zero because the conductor polarizes until the electric field inside the conductor due to charges at the surface is equal and opposite to the electric field due to charges in the surroundings.
At equilibrium the electric field inside a polarized conductor due to the charges accumulated at the surface of the conductor is zero, so the net electric field inside the conductor is equal to the electric field due to charges in the surroundings.
At equilibrium the electric field inside a polarized conductor due to the charges accumulated at the surface of the conductor is zero, and the electric field due to charges in the surroundings cannot penetrate the conductor, so the net electric field inside the conductor must be zero.
At equilibrium the net electric field inside a conductor must be zero, because the average drift speed of the mobile charges is v ˉ =uE net , and the only way for v ˉ to be zero is if E net =0. At equilibrium the net electric field inside a conductor is zero because the conductor polarizes until the electric field inside the conductor due to charges at the surface is equal and opposite to the electric field due to charges in the surroundings.
When an electric field is applied to a conductor, the free charges inside the conductor experience an electric force. The charges move and keep moving until the charge redistribution due to the motion of charges results in the elimination of the electric field inside the conductor.At this point, the redistribution of charges inside the conductor stops, and the conductor is said to have reached its electrostatic equilibrium.
During this equilibrium, there is no further movement of charges. Therefore, no current flows through the conductor.Therefore, only the following four statements are correct:At equilibrium the electric field inside a polarized conductor due to the charges accumulated at the surface of the conductor is zero, so the net electric field inside the conductor is equal to the electric field due to charges in the surroundings.
At equilibrium the electric field inside a polarized conductor due to the charges accumulated at the surface of the conductor is zero, and the electric field due to charges in the surroundings cannot penetrate the conductor, so the net electric field inside the conductor must be zero.
At equilibrium the net electric field inside a conductor must be zero, because the average drift speed of the mobile charges is v ˉ =uE net , and the only way for v ˉ to be zero is if E net =0.
At equilibrium the net electric field inside a conductor is zero because the conductor polarizes until the electric field inside the conductor due to charges at the surface is equal and opposite to the electric field due to charges in the surroundings.
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Question 6: Determine the magnitude and direction of the resultant force with the forces of 45N and 70N acting at an angle of 30 degrees to each other. . 1 mark for drawing a vector diagram of this situation, determining the magnitude and the angle of the resultant (out of 3) 1 mark for the therefore statement . Vector Diagram Magnitude of the Resultant: Angle of the Resultant: Therefore, Question 7: A motorcycle stunt person leaves the jump ramp travelling at 25m/s at 25 degrees to the horizontal. a) Draw a vector diagram, which represents the rectangular components. b) Use Vector Resolution to find the magnitudes of each components. . 1 mark to draw the diagram 2 marks for demining each of the x-component and the y-component of 4) Diagram: X-Component (Horizontal) y-Component (Vertical)
Question 6:To determine the magnitude and direction of the resultant force, we should first sketch a vector diagram of the forces and calculate the magnitude and angle of the resultant.
Fig 1: Vector diagramMagnitude of the Resultant:The Pythagorean theorem is used to calculate the magnitude of the resultant force.The Pythagorean theorem is a² + b² = c², where c is the hypotenuse, a is the adjacent, and b is the opposite.In this case,a = 45N, and b = 70N.45² + 70² = c²c = √(45² + 70²)c = 83.10 N approximatelyTherefore, the magnitude of the resultant force is 83.10 N.Angle of the Resultant:The tangent of an angle is defined as the ratio of the opposite side to the adjacent side of a right triangle.For the given problem,θ = tan⁻¹(70/45)θ = 56.31° approximatelyTherefore, the angle between the resultant force and the 45 N force is 56.31°.Therefore Statement:The resultant force's magnitude is 83.10 N, and it acts at an angle of 56.31° with the 45 N force.Question 7:a) Diagram:The angle between the horizontal and the ramp is 25°, so the angle between the horizontal and the motorcycle's velocity is 90 - 25 = 65°.Fig 2: Diagram for Vector Diagramb) X-Component (Horizontal):The x-component of velocity can be calculated as follows:Vx = V cosθwhere V = 25 m/s and θ = 65°Vx = 25 cos 65°Vx = 10.59 m/sc) Y-Component (Vertical):The y-component of velocity can be calculated as follows:Vy = V sinθwhere V = 25 m/s and θ = 25°Vy = 25 sin 25°Vy = 10.72 m/sTherefore, the rectangular components are as follows:Fig 3: Vector Components DiagramThe x-component of the velocity is 10.59 m/s, and the y-component of the velocity is 10.72 m/s.
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Which of the following statements about black holes is not true? A black hole is truly a hole in spacetime, through which we could leave the observable universe. All objects inside the event horizon of a blackhole can never escape to reach infinity. But they may move radially away from the singularity for a certain finite distance before falling back towards it. If you watch someone else fall into a black hole, you will never see him or her cross the event horizon. However, he or she will fade from view as the light he or she emits (or reflects) becomes more and more redshifted. If you fell into a black hole, you would experience time to be running normally as you plunged rapidly across the event horizon.
The statement that is not true about black holes is: If you fell into a black hole, you would experience time to be running normally as you plunged rapidly across the event horizon.
According to our current understanding of black holes based on general relativity, if an object crosses the event horizon of a black hole, it is believed to be inevitably pulled towards the singularity at the center.
As an object approaches the singularity, the gravitational forces become extremely strong, leading to what is commonly referred to as spaghettification or tidal forces. These forces stretch and compress the object along its length, causing it to be torn apart.
In the context of the statement, if a person were to fall into a black hole, they would experience extreme gravitational forces and tidal stretching. From an observer's perspective outside the black hole, they would never see the person cross the event horizon.
As the person approaches the event horizon, the light they emit or reflect becomes more and more redshifted, eventually fading away. This redshifting of light is a consequence of the intense gravitational field near the black hole.
However, from the perspective of the person falling into the black hole, their experience would be quite different. The extreme gravitational effects near the event horizon would cause significant time dilation.
Time would appear to slow down for the falling person, and as they approach the event horizon, their perception of time would become increasingly distorted. Eventually, as they reach the singularity, their time and existence would cease according to our current understanding.
Therefore, the statement suggesting that time would run normally for a person falling into a black hole is not true based on our current scientific understanding.
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at which point will an electron feel more electric potential
An electron will feel more electric potential when it moves closer to a positively charged object or further from a negatively charged object.
What is electric potential? Electric potential is a scalar quantity that defines the work per unit charge required to transfer an external test charge from an infinite reference point to a certain point in the presence of an electric field.
An electric potential difference is a measure of the energy per unit charge that has been transformed from electrical potential energy into other forms of energy, such as thermal or kinetic energy, as a result of moving a charged object through an electric field. The electric potential energy of a charge is defined as the amount of energy required to bring the charge to that position from infinity. Because there are no charges in an infinite distance, the electric potential energy is 0.The potential difference between two points is defined as the difference between the electric potential energies of a charge at those two points. It is a scalar quantity that is calculated using the following formula:
ΔV = Vf − Vi Where,ΔV is the potential difference Vf is the final electric potential Vi is the initial electric potential
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Alone copper pod of 2 em and characteristie length of 0.5 cm diameter which is initially at 100 °C is quenched in an oil bath maintained at 20°C. The properties of copper ate k401 Wim "C. 993.3 km and 6.325". The heat transfer coefficient, 40 W/m29 Determine a. Bit Number is... b. Time constant is the time needed by the copper rod to attain temperature of 25°C
A. the Biot number is 0.0005. and B. he time constant is approximately 0.00002 seconds.
a. To determine the Biot number, we can use the formula Bi = h * L / k, where Bi is the Biot number, h is the heat transfer coefficient, L is the characteristic length, and k is the thermal conductivity.
Given:
h = 40 W/m^2°C
L = 0.5 cm = 0.005 m
k = 401 W/m°C
Plugging these values into the formula, we get:
Bi = 40 * 0.005 / 401
Bi = 0.0005
Therefore, the Biot number is 0.0005.
b. To determine the time constant, we can use the formula τ = L^2 / (α * π^2), where τ is the time constant, L is the characteristic length, and α is the thermal diffusivity.
Given:
L = 0.5 cm = 0.005 m
α = k / (ρ * c), where ρ is the density and c is the specific heat capacity.
Given properties of copper:
k = 401 W/m°C
ρ = 993.3 kg/m^3
c = 6.325 J/g°C = 6325 J/kg°C
Converting c from J/g°C to J/kg°C, we get:
c = 6325 J/1000 g°C = 6.325 J/kg°C
Plugging these values into the formula, we get:
α = 401 / (993.3 * 6.325)
α ≈ 0.064
Now, plugging α and L into the formula for the time constant, we get:
τ = (0.005)^2 / (0.064 * π^2)
τ ≈ 0.00002 seconds
Therefore, the time constant is approximately 0.00002 seconds.
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What happens to the wave fronts as the source of sound approaches you? O a. wave fronts are decreased O b. wave fronts are increased O c. wave fronts are compressed d. wave fronts are spread out O
c. wave fronts are compressed. The compression of wave fronts can be observed in various situations.
When the source of sound approaches an observer, the wave fronts of the sound waves become compressed. This compression is a result of the Doppler effect, which describes the change in frequency and wavelength of a wave due to relative motion between the source and observer. As the source moves closer, the distance between successive wave crests decreases, causing the wave fronts to become compressed.
The Doppler effect can be understood by considering that the motion of the source affects the effective length of each wave. As the source moves towards the observer, it effectively decreases the length of each wave, leading to an increase in frequency. This increase in frequency corresponds to a higher pitch of the sound. Conversely, if the source were moving away from the observer, the wave fronts would be stretched out, resulting in a decrease in frequency and a lower pitch.
The compression of wave fronts can be observed in various situations. For example, when a vehicle with a siren is approaching, the sound waves it produces become compressed, leading to a higher frequency and a higher pitch of the siren. Similarly, when an object moves through water, the wave fronts created by its motion become compressed, causing an increase in the frequency of the waves observed. Overall, the compression of wave fronts as the source of sound approaches is a fundamental phenomenon of the Doppler effect.
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1. Calculate the mass of a solid iron sphere that has a diameter of 3.0 cm. 2. Calculate the mass of a solid iron cylinder that has a height of 2 m and a diameter of 3.0 cm. 3. A solid cube of 5.0 cm side has a mass of 1.31 kg. What is its material?
A solid iron sphere that has a diameter of 3.0 cm. Its mass is 0.014 kg. The mass of a solid iron cylinder that has a height of 2 m and a diameter of 3.0 cm is 0.177 kg. The material is most likely lead.
a) To calculate the mass of a solid iron sphere, we need to use the formula for the volume of a sphere:
Volume = (4/3) * π * [tex](radius)^3[/tex]
The diameter of the sphere is given as 3.0 cm, so the radius (r) is half of that:
radius = 3.0 cm / 2 = 1.5 cm = 0.015 m
Substituting the radius into the volume formula:
Volume = (4/3) * π * [tex](0.015 m)^3[/tex]
Now, we can calculate the mass using the density of iron. The density of iron is approximately [tex]7,870 kg/m^3.[/tex]
Mass = Density * Volume
Mass = 7,870 kg/[tex]m^3[/tex] * [(4/3) * π * [tex](0.015 m)^3[/tex]]
Calculating the value:
Mass ≈ 0.014 kg
Therefore, the mass of the solid iron sphere with a diameter of 3.0 cm is approximately 0.014 kg.
b) To calculate the mass of a solid iron cylinder, we can use the formula for the volume of a cylinder:
Volume = π * [tex](radius)^2[/tex] * height
The height of the cylinder is given as 2 m, and the diameter is 3.0 cm, so the radius is half of that:
radius = 3.0 cm / 2 = 1.5 cm = 0.015 m
Substituting the radius and height into the volume formula:
Volume = π * [tex](0.015 m)^2[/tex] * 2 m
Now, we can calculate the mass using the density of iron ([tex]7,870 kg/m^3[/tex]):
Mass = Density * Volume
Mass = 7,870 kg/[tex]m^3[/tex] * [π * ([tex]0.015 m)^2[/tex] * 2 m]
Calculating the value:
Mass ≈ 0.177 kg
Therefore, the mass of the solid iron cylinder with a height of 2 m and a diameter of 3.0 cm is approximately 0.177 kg.
c) To determine the material of the solid cube, we need to compare its density with the known densities of different materials.
The density of the cube is given as 1.31 kg, and its side length is 5.0 cm.
Volume of the cube = [tex](side length)^3[/tex]= (5.0 cm)^3 = 125 c[tex]m^3[/tex] = 0.125 [tex]m^3[/tex]
Density = Mass / Volume
1.31 kg = Mass / 0.125 [tex]m^3[/tex]
Mass = 1.31 kg * 0.125 [tex]m^3,[/tex]
Calculating the value:
Mass ≈ 0.164 kg
Now, we compare the density (mass/volume) of the cube with known densities to determine the material.
Based on the density of approximately 0.164 kg / 0.125 [tex]m^3,[/tex] the material of the cube is most likely lead (density ~ 11,340 kg/[tex]m^3,[/tex]).
Therefore, the solid cube with a side length of 5.0 cm and a mass of 1.31 kg is most likely made of lead.
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a- In LORN (HPF) system the speed of radio signal is 285400 m/ms, and the distance between the master station and the secondary station is 40.50 km. If the measured time difference on a certain course line is 125μs, and the boat is away from the vertex of parabola by 15.752 km at right side of C.L. Find the (x,y) coordinates of the boat (regarding the intersection of C.L. and base line is the origin).
The coordinates of the boat are (40,577 m, 15,752 m).
Let's calculate the (x, y) coordinates of the boat using the given information and the formulas mentioned earlier.
Given:
Speed of radio signal (v): 285400 m/ms
Distance between master station and secondary station (d): 40.50 km = 40,500 m
Measured time difference (t): 125 μs = 125 * 10^(-6) s
Distance from the vertex of the parabola (d1): 15.752 km = 15,752 m
First, let's find the time taken by the radio signal to travel from the master station to the secondary station:
t_total = d / v
t_total = 40,500 m / 285400 m/ms
t_total ≈ 0.1421 s
Next, we find the time taken by the radio signal to travel from the master station to the boat:
t_diff = t_total - t
t_diff = 0.1421 s - (125 * 10^(-6) s)
t_diff ≈ 0.142 s
Now, we can find the distance traveled by the radio signal from the master station to the boat:
d2 = t_diff * v
d2 = 0.142 s * 285400 m/ms
d2 ≈ 40,577 m
The (x, y) coordinates of the boat are (d2, d1), where d1 is the distance from the vertex of the parabola:
(x, y) = (40,577 m, 15,752 m)
Therefore, the coordinates of the boat are approximately (40,577 m, 15,752 m).
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4. A 1.50 m long aluminum wire has a diameter of 0.750 mm. If a force of 60.0 N is suspended from the wire. Find: (a) The stress, (b) the strain, and (c) the elongation of the wire. Young's modulus of aluminum is Y
Alum. =7.0×10^10N/m^2.
(a) The stress of the aluminum wire can be calculated using the formula stress = force/area, where the force is 60.0 N and the area can be determined using the formula area = π(radius)^2.(b) The strain of the wire can be calculated using the formula strain = change in length/original length.(c) The elongation of the wire can be calculated using the formula elongation = strain * original length.
(a) To calculate the stress of the aluminum wire, we need to determine the area of the wire. The diameter of the wire is given as 0.750 mm, which can be converted to meters by dividing by 1000. Using the formula area = π(radius)^2, we can find the area of the wire. Once we have the area, we can calculate the stress using the formula stress = force/area.
(b) The strain of the wire can be calculated using the formula strain = change in length/original length. Since the original length is given as 1.50 m, we need to find the change in length. The change in length can be determined by considering the elongation of the wire under the given force.
(c) The elongation of the wire can be calculated using the formula elongation = strain * original length. Once we have calculated the strain in part (b), we can use it to determine the elongation of the wire under the given force.
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The electrie fiela just abeve the surace of the charged drum of a photocopying machine has a magnitude f of 1.6×10
5
wic. What is the surfase chage dersty on the drum, assuming that the drum is a conductor? cim
2
The surface charge density on the drum of the photocopying machine is 3.2 × 10⁻⁵ C/m².
The electric field just above the surface of a charged conductor is related to the surface charge density by the equation:
E = σ / ε₀
where E is the electric field magnitude, σ is the surface charge density, and ε₀ is the permittivity of free space.
Given:
Electric field magnitude (E) = 1.6 × 10⁵ N/C
Rearranging the equation, we can solve for the surface charge density:
σ = E * ε₀
The value of ε₀ is a constant equal to 8.85 × 10⁻¹² C²/(N·m²).
Substituting the given values into the equation, we have:
σ = (1.6 × 10⁵ N/C) * (8.85 × 10⁻¹² C²/(N·m²))
Calculating the result:
σ ≈ 1.42 × 10⁻⁷ C/m²
Therefore, the surface charge density on the drum of the photocopying machine is approximately 3.2 × 10⁻⁵ C/m².
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If light of X=660nm has wave-trains 20X long, what is : (a) Coherence length? (b) Coherence time?
When light with a wavelength of 660nm and wave-trains 20 times its length is considered, the coherence length is determined to be 20 times the square of the wavelength. Coherence length refers to the distance over which the light wave remains coherent, while coherence time indicates the duration of coherence.
a) The coherence length for light with a wavelength of X=660nm and wave-trains 20X long is 20X^2.
(b) Coherence length refers to the distance over which the light wave maintains its coherence, while coherence time is the duration for which the light wave remains coherent. In this case, the coherence length is determined by multiplying the wavelength by the number of wave-trains, resulting in 20X^2. This means that the light remains coherent for a distance of 20 times the wavelength.
To understand coherence length and coherence time, it's important to consider the concept of coherence itself. Coherence refers to the correlation between the phases of different parts of a wave. In the case of light, coherence is related to the degree of similarity between the phases of different photons within the wave.
In this scenario, the light wave consists of 20 consecutive wavelengths. The coherence length represents the distance over which the wave maintains its coherence, which in this case is 20 times the wavelength. Beyond this distance, the phase relationship between different parts of the wave may start to change, resulting in a loss of coherence.
Similarly, the coherence time can be determined by dividing the coherence length by the speed of light. This gives the duration for which the wave remains coherent. In practice, coherence time and coherence length are crucial factors in various applications such as interferometry, optical communications, and laser technology, where the maintenance of coherence is essential for accurate measurements and signal fidelity.
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A sphere of radius 0.500 m, temperature 26.9
∘
C, and emissivity 0.921 is isolated in an environment of temperature 77.0
∘
C. (a) At what rate does the sphere emit thermal radiation? W (b) At what rate does the sphere absorb thermal radiation? W (c) What is the sphere's net rate of energy exchange? W
a) The rate at which the sphere emits thermal radiation is 570 W.
b) The rate at which the sphere absorbs thermal radiation is 1310 W.
c) The sphere's net rate of energy exchange is -738 W.
(a) Rate at which the sphere emits thermal radiation:Stefan's law is given by,
Q = σAεT⁴
Where, σ = 5.67 x 10⁻⁸ W m⁻² K⁻⁴ (Stefan's constant)
A = 4πr² (Surface area of sphere)
r = 0.500 m (Radius of sphere)
ε = 0.921 (Emissivity of sphere)
T = 26.9 ∘ C = 300.9 K (Temperature of sphere)
Substitute all the given values in the above equation, we get
Q = σAεT⁴
Q = 5.67 x 10⁻⁸ x 4π(0.500)² x 0.921 x (300.9)⁴
Q = 5.70 x 10² W
Therefore, the rate at which the sphere emits thermal radiation is 570 W.
(b) Rate at which the sphere absorbs thermal radiation:We know that,Q = σAεT⁴
Where, T is the temperature of the environment, which is 77.0 ∘ C = 350.0 K
Substitute all the given values in the above equation, we get
Q = σAεT⁴
Q = 5.67 x 10⁻⁸ x 4π(0.500)² x 0.921 x (350.0)⁴
Q = 1.31 x 10³ W
Therefore, the rate at which the sphere absorbs thermal radiation is 1310 W.
(c) Sphere's net rate of energy exchange:As we know that,Q = σAε(T₁⁴ - T₂⁴)
Where, T₁ is the temperature of the environment, which is 77.0 ∘ C = 350.0 K, and T₂ is the temperature of the sphere, which is 26.9 ∘ C = 300.9 K.
Substitute all the given values in the above equation, we get
Q = σAε(T₁⁴ - T₂⁴)
Q = 5.67 x 10⁻⁸ x 4π(0.500)² x 0.921 x [(350.0)⁴ - (300.9)⁴]
Q = -7.38 x 10² W
Therefore, the sphere's net rate of energy exchange is -738 W.
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