Answer:
x1 (Joseph) = 12.5 + .8 y1
x2 (John) = 12.5 + .8 y2
x1 - x2 = .8 (y1 - y2) subtracting equations
x1 - x2 = .8 (180 - 170) = 8
True
which temperature site is considered to be the most accurate
Thermometers are considered to be the most accurate temperature-measuring devices. They provide a direct and precise measurement of temperature and are more accurate than other temperature-measuring devices such as infrared thermometers.
The site that is considered to be the most accurate in terms of temperature is the thermometer. The thermometer is an instrument that is used to measure temperature. It is the most accurate method of measuring temperature because it provides a direct and precise measurement of temperature.
There are other temperature-measuring devices, such as infrared thermometers, which measure temperature by detecting infrared radiation emitted by an object. While these devices are useful in certain situations, they are not as accurate as thermometers.
Thermometers work by using a liquid that expands or contracts when heated or cooled. This expansion or contraction is then measured by a calibrated scale to determine the temperature. Most thermometers are filled with mercury or alcohol, which are very sensitive to changes in temperature. This sensitivity makes them very accurate when it comes to measuring temperature.
In conclusion, thermometers are considered to be the most accurate temperature-measuring devices. They provide a direct and precise measurement of temperature and are more accurate than other temperature-measuring devices such as infrared thermometers.
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Lineman A has a mass of 110 kg and is traveling with a velocity of 4.5 m/s when he collides head-on with lineman B, who is going in the opposite direction and has a mass of 100 kg and is traveling at 5 m/s. If both players remain on their feet, what will happen?
The total momentum before the collision is given by the sum of the individual momenta:
[tex]p_{total}_{before}[/tex]= pA + pB
= 495 kg·m/s - 500 kg·m/s
= -5 kg·m/s
To determine what will happen when lineman A and lineman B collide, we need to analyze the conservation of momentum.
The principle of conservation of momentum states that the total momentum before a collision is equal to the total momentum after the collision, assuming no external forces are involved.
The momentum of an object is given by the product of its mass and velocity. Mathematically, momentum (p) can be expressed as:
p = m * v
where p is the momentum, m is the mass, and v is the velocity.
Before the collision, lineman A has a momentum (pA) of:
pA = m_A * v_A
= (110 kg) * (4.5 m/s)
= 495 kg·m/s
Likewise, lineman B has a momentum (pB) of:
pB = m_B * v_B
= (100 kg) * (-5 m/s) [negative sign indicates opposite direction]
= -500 kg·m/s
The total momentum before the collision is given by the sum of the individual momenta:
p_total_before = pA + pB
= 495 kg·m/s - 500 kg·m/s
= -5 kg·m/s
Since the total momentum before the collision is non-zero, we expect that the total momentum after the collision should also be non-zero. This implies that the players will continue to move after the collision, albeit with different velocities.
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An air column tube is filled with water. A sound source is placed just above it which emits a constant frequency. As you lower the level of the water you find resonance (standing wave occurs) in the tube occurs at 7.05 cm, 21.15 cm and at 35.25 cm as noted by an increase in the volume of the sound. (The first 3 resonant lengths (harmonics) are what is given). If the temperature in the room in which you are doing your experiment is 20.0 °C, what is the frequency of the sound used?
The frequency of the sound used in the experiment is approximately 2443 Hz.
To determine the frequency of the sound used in the experiment, we can use the formula for the resonant frequencies of a closed air column tube:
f = (n/2L) * v
Where:
f is the frequency of the sound,
n is the harmonic number,
L is the length of the tube, and
v is the speed of sound.
Given the resonant lengths of the tube (7.05 cm, 21.15 cm, and 35.25 cm) and the temperature in the room (20.0 °C), we can calculate the speed of sound using the formula:
v = 331.4 + 0.6T
Where:
v is the speed of sound in m/s, and
T is the temperature in degrees Celsius.
First, let's convert the resonant lengths from centimeters to meters:
L1 = 7.05 cm = 0.0705 m
L2 = 21.15 cm = 0.2115 m
L3 = 35.25 cm = 0.3525 m
Next, let's calculate the speed of sound at 20.0 °C:
v = 331.4 + 0.6 * 20.0
v = 343.4 m/s
Now, we can calculate the frequency for each resonant length using the harmonic number (n) of 1, 2, and 3:
f1 = (1 / (2 * 0.0705)) * 343.4
f2 = (2 / (2 * 0.2115)) * 343.4
f3 = (3 / (2 * 0.3525)) * 343.4
Calculating these frequencies, we get:
f1 ≈ 2443 Hz
f2 ≈ 4885 Hz
f3 ≈ 7328 Hz
Therefore, the frequency of the sound used in the experiment is approximately 2443 Hz.
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A convex mirror has a focal length of 20 cm. What is the position of the image (in cm), if the image is upright and 2.7 times smaller than the object? (For convex mirror, f is negative, and since the image is behind the mirror, q is also negative number).
The position of the image formed by a convex mirror of a focal length of 20 cm can be calculated by using the mirror formula and magnification equation, and the calculated answer comes out to be approximately -73.01 cm.
To solve this problem, we can use the mirror equation for convex mirrors:
1/f = 1/p + 1/q
Where:
f = focal length of the convex mirror (given as -20 cm)
p = object distance
q = image distance
We are given that the image is upright and 2.7 times smaller than the object. This means the magnification (m) is -2.7. The magnification can be calculated as:
m = -q/p
Substituting the given values into the magnification equation:
-2.7 = -q/p
To simplifying, we can rewrite this as:
q = 2.7p
Now, substitute the values into the mirror equation:
1/-20 = 1/p + 1/(2.7p)
Simplifying and solving for p:
-1/20 = (2.7 + 1) / (2.7p)
-1/20 = 3.7 / (2.7p)
Cross-multiplying and solving for p:
-2.7p = 20 × 3.7
p = -20 × 3.7 / 2.7
p ≈ -27.04 cm
Since the object is in front of the mirror, the object distance (p) is positive. Therefore, the position of the image (q) is negative:
q = 2.7p ≈ 2.7 × (-27.04) ≈ -73.01 cm
The position of the image is approximately -73.01 cm.
The distances in front of the mirror are considered positive, while distances behind the mirror are negative.
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Find the momentum of a Photon wavelength 230nm A. 4.2x 10^-22 kgm/s B. 3.4x 10^-18 kgm/s C. 2.88 x 10^-27kgm/s
The momentum of the photon with a wavelength of 230 nm is approximately 2.879 x 1[tex]0^{-27}[/tex] kg m/s.
Hence, the correct option is C.
The momentum of a photon can be calculated using the formula:
p = h / λ
Where p is the momentum, h is the Planck's constant (h = 6.626 x 1[tex]0^{-34}[/tex] J s), and λ is the wavelength of the photon.
Given λ = 230 nm = 230 x 1[tex]0^{-9}[/tex] m, we can substitute the values into the formula:
p = (6.626 x 1[tex]0^{-34}[/tex] J s) / (230 x 1[tex]0^{-9}[/tex] m)
p = 2.879 x 1[tex]0^{-27}[/tex] kg m/s
Therefore, the momentum of the photon with a wavelength of 230 nm is approximately 2.879 x 1[tex]0^{-27}[/tex] kg m/s.
Thus, the correct answer is option C: 2.879 x 1[tex]0^{-27}[/tex] kg m/s.
Hence, the correct option is C.
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We have the thermodynamic cycle described in figure 1, the process ac is isobaric, the process cb is adiabatic and the process ba is isovolumetric. The thermodynamic cycle is carried out with 5 moles of gas with a Cp of 29.1 J/mol K, the temperature at point a is 250 K, at point b it is 550 K and at point c it is 475 K. Determine :
a) The net work of the thermodynamic cycle.
b) The net heat of the thermodynamic cycle.
The net work of the thermodynamic cycle is zero, and there is no net heat exchange during the cycle.
To determine the net work and net heat of the thermodynamic cycle, we need to analyze each process individually and then calculate the overall values.
(a) Net work of the thermodynamic cycle:
The net work (Wnet) is the sum of the work done during each process of the cycle.
Process ac (isobaric): Since it is isobaric, the work done (Wac) is given by Wac = PΔV, where P is the constant pressure and ΔV is the change in volume. However, since it is an isovolumetric process, the volume does not change, and therefore Wac = 0.
Process cb (adiabatic): The work done (Wcb) is given by Wcb = (Cv / γ) * (Tc - Tb), where Cv is the molar specific heat at constant volume, γ is the ratio of specific heats, and Tc and Tb are the temperatures at points c and b, respectively. However, since it is an adiabatic process, there is no heat exchange, and therefore Wcb = 0.
Process ba (isovolumetric): Since it is isovolumetric, the work done (Wba) is also zero.
Therefore, the net work of the thermodynamic cycle is Wnet = Wac + Wcb + Wba = 0 + 0 + 0 = 0.
(b) Net heat of the thermodynamic cycle:
The net heat (Qnet) is the sum of the heat added or removed during each process of the cycle.
Process ac (isobaric): The heat added (Qac) is given by Qac = nCp(Tc - Ta), where n is the number of moles of gas, Cp is the molar specific heat at constant pressure, and Ta and Tc are the temperatures at points a and c, respectively. However, since it is an isovolumetric process, there is no heat exchange, and therefore Qac = 0.
Process cb (adiabatic): Since it is an adiabatic process, there is no heat exchange, and therefore Qcb = 0.
Process ba (isovolumetric): The heat removed (Qba) is given by Qba = nCv(Ta - Tb), where Cv is the molar specific heat at constant volume, and Ta and Tb are the temperatures at points a and b, respectively. However, since it is an isovolumetric process, there is no heat exchange, and therefore Qba = 0.
Therefore, the net heat of the thermodynamic cycle is
Qnet = Qac + Qcb + Qba
= 0 + 0 + 0 = 0.
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Select all the statements that apply. 1. Young's modulus is a characteristic of a solid 2. Shear modulus is a characteristic of a solid 3. Shear stress results from a force exerted perpendicular to an area. 4. The bulk modulus is a characteristic of a liquid 5. Tensile stress results from a force exerted parallel to an area
A solid's Young's modulus is one of its properties. The ratio of the applied stress to the resulting strain serves as a metric for determining the stiffness of a solid material.
It is sometimes referred to as the elastic modulus and is normally expressed in pascals (Pa) units. A solid's shear modulus is another quality. It is a measurement of a solid material's stiffness in response to shear stress and is established as the relationship between the applied shear stress and the resulting strain.
Pascals (Pa) are the most common units used to measure it. When a force is applied perpendicular to an object, shear stress is the result. It is a form of tension brought on by a force.
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When throwing a ball, your hand releases it at a height of 1.1 m above the ground with velocity 6.4 m/s in direction 53° above the horizontal. (a) How high above the ground (not your hand) does the ball go? ___ m (b) At the highest point, how far is the ball horizontally from the point of release? ___m
By using the equations of projectile motion, the ball reaches a height of approximately 2.355 meters above the ground.
To solve this problem, we can use the equations of projectile motion.
(a) To determine the maximum height reached by the ball, we can analyze the vertical motion. We'll use the following kinematic equation:
Vertical displacement (Δy) = (Initial vertical velocity (v₀y) x Time of flight (t)) - (0.5 x Acceleration due to gravity (g) x Time of flight (t)²)
The initial vertical velocity can be found using the given initial velocity and the angle of projection:
v₀y = Initial velocity (v₀) x sin(angle)
v₀y = 6.4 m/s x sin(53°)
Now we can find the time of flight using the equation:
Time of flight (t) = (2 x v₀y) / g
where g is the acceleration due to gravity (approximately 9.8 m/s²).
Substituting the values, we get:
t = (2 x (6.4 m/s x sin(53°))) / 9.8 m/s²
Next, we substitute the time of flight back into the first equation to find the vertical displacement:
Δy = (6.4 m/s x sin(53°)) x ((2 x (6.4 m/s x sin(53°))) / 9.8 m/s²) - (0.5 x 9.8 m/s²) x ((2 x (6.4 m/s x sin(53°))) / 9.8 m/s²)²
Simplifying the equation, we find:
Δy ≈ 2.355 m
Therefore, the ball reaches a height of approximately 2.355 meters above the ground.
(b) At the highest point of the ball's trajectory, its vertical velocity becomes zero. At this point, only the horizontal velocity component is active. The horizontal distance traveled can be determined using the equation:
Horizontal distance = Horizontal velocity x Time of flight
The horizontal velocity can be found using the given initial velocity and the angle of projection:
Horizontal velocity = Initial velocity (v₀) x cos(angle)
Substituting the values, we get:
Horizontal distance = 6.4 m/s x cos(53°) x ((2 x (6.4 m/s x sin(53°))) / 9.8 m/s²)
Simplifying the equation, we find:
Horizontal distance ≈ 6.615 m
Therefore, the ball is approximately 6.615 meters horizontally from the point of release at its highest point.
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The focal length of a concave spherical mirror is 25 cm. What is its radius of curvature?
a. 40cm
b. 10cm
c. 50cm
d. 25cm
The radius of curvature of the concave spherical mirror is 50 cm.
Hence, the correct option is C.
In a concave spherical mirror, the focal length (f) is related to the radius of curvature (R) by the formula:
1/f = 2/R
Given that the focal length is 25 cm, we can rearrange the formula to solve for the radius of curvature:
R = 2/(1/f)
Substituting the value of focal length (f = 25 cm) into the equation, we have:
R = 2/(1/25) = 2 * 25 = 50 cm
Therefore, the radius of curvature of the concave spherical mirror is 50 cm.
Hence, the correct option is (c) 50 cm.
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at room temperature the solubility of which solute in water
Solubility is determined by the chemical nature of the solute and the solvent, temperature, pressure, and the presence of other substances. Most solids have an increase in solubility as the temperature rises. The solubility of gases decreases as the pressure above the liquid surface increases. The presence of other substances can either decrease or increase the solubility of the solute.
At room temperature, the solubility of several solutes in water can be determined. Solubility refers to the amount of solute that can dissolve in a solvent at a specific temperature and pressure. The solubility of the solute depends on the nature of the solute and the solvent as well as the temperature and pressure. It is essential to know the solubility of the solute in water because water is a universal solvent. Hence it can dissolve a vast number of substances.
Explanation: The solubility of which solute in water is determined by various factors. These factors are the chemical nature of the solute and the solvent, temperature, pressure, and the presence of other substances. The solubility of most solids in water increases as the temperature rises. This is because the solubility of most solids in water is endothermic. As the temperature rises, the solubility of the solute in water increases. This is because the heat energy breaks down the bonds between the solute molecules, allowing them to dissolve more easily in the water.
Solubility is inversely proportional to the pressure. This is particularly true of gases. As the pressure of a gas above the liquid surface increases, the solubility of the gas in the liquid decreases. The solubility of the solute is also influenced by other substances present in the water. If the solute and the other substance have the same charge, the solubility of the solute decreases. If the solute and the other substance have different charges, the solubility of the solute increases.
Conclusion: In conclusion, solubility is determined by the chemical nature of the solute and the solvent, temperature, pressure, and the presence of other substances. Most solids have an increase in solubility as the temperature rises. The solubility of gases decreases as the pressure above the liquid surface increases. The presence of other substances can either decrease or increase the solubility of the solute.
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An object is placed halfway between F and 2F in front of a converging lens. a. Do a ray trace (with at least 2 rays) and fully describe the qualities of the image formed. Be as neat as possible, but I understand the limits of doing this without the proper tools.
b. The focal length of the lens is 10 cm. Calculate the image position and the magnification.
c. If object distance is halved, find the new image position, magnification, and type (real or virtual). Note: don't do another ray trace.
a) The rays converge after passing through the lens. To determine the qualities of the image formed, we need to extend the refracted rays and locate their intersection point.
b) The magnification of the image is -2, indicating that the image is inverted.
c) The image distance is positive (10 cm) and the magnification is negative (-2), the image formed is still real and inverted.
(a) Ray trace for an object placed halfway between F and 2F in front of a converging lens:
In this scenario, let's assume the object is placed at a distance of F/2 from the converging lens.
Ray 1: Draw a ray parallel to the principal axis. After passing through the lens, it will refract and pass through the focal point on the other side.
Ray 2: Draw a ray passing through the optical center (C) of the lens. It will continue in a straight line without any refraction.
The rays converge after passing through the lens. To determine the qualities of the image formed, we need to extend the refracted rays and locate their intersection point. The diagram is given in the image.
(b) Calculation of image position and magnification:
Given:
Focal length (f) = 10 cm
Object distance (d₀) = F/2 = 10 cm / 2 = 5 cm
Using the lens formula:
1/f = 1/d₀ + 1/dᵢ
where:
dᵢ = image distance (to be determined)
Substituting the given values:
1/10 cm = 1/5 cm + 1/dᵢ
Simplifying:
1/10 cm - 1/5 cm = 1/dᵢ
2/10 cm - 1/10 cm = 1/dᵢ
1/10 cm = 1/dᵢ
dᵢ = 10 cm
Therefore, the image is formed at a distance of 10 cm from the lens.
To calculate the magnification (m), we can use the formula:
m = -dᵢ / d₀
Substituting the given values:
m = -10 cm / 5 cm
m = -2
Therefore, the magnification of the image is -2, indicating that the image is inverted.
(c) Calculation of new image position, magnification, and type (real or virtual) if the object distance is halved:
Given:
Object distance (d₀) = 5 cm (halved from the previous scenario)
Using the lens formula:
1/f = 1/d₀ + 1/dᵢ
Substituting the given values:
1/10 cm = 1/5 cm + 1/dᵢ
Simplifying:
1/10 cm - 1/5 cm = 1/dᵢ
2/10 cm - 1/10 cm = 1/dᵢ
1/10 cm = 1/dᵢ
dᵢ = 10 cm
The image distance remains the same at 10 cm.
To calculate the magnification (m), we can use the formula:
m = -dᵢ / d₀
Substituting the given values:
m = -10 cm / 5 cm
m = -2
The magnification remains the same at -2.
Since the image distance is positive (10 cm) and the magnification is negative (-2), the image formed is still real and inverted.
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A sailboat racecourse consists of four legs, defined by the displacement vectors A, B, C, and D as the drawing indicates. The magnitudes of the first three vectors are A -3.20 km, B-5.10 km, and C 4.80 km. The finish line of the course coincides with the starting line. Using the data in drawing, find the distance of the fourth leg and the angle ? 23.0 35.0Q Finish-L-Start
The distance of the fourth leg and the angle is Ф = 29.94 degree and d = 6.73 km
Vector addition is the process of combining two or more vectors to obtain a resultant vector. The resultant vector is determined by adding the corresponding components of the vectors.
To add vectors, we add their horizontal components together and their vertical components together separately.
The horizontal component of the resultant vector is the sum of the horizontal components of the individual vectors.
The vertical component of the resultant vector is the sum of the vertical components of the individual vectors.
By adding the horizontal and vertical components, we can find the resultant vector in terms of its magnitude and direction.
GIven :A = 3.20km
B = 5.10km
C = 4.80 km
D = ?
adding components all along the x-axis
3.60 cos40 - 5.10 cos 35 - 4.80 cos 23 + d (cosФ) = 0
d (cosФ) = -5.8383
similarly for y components
d (sinФ) = -3.363
so tanФ = 0.576
Ф = 29.94 degree
d = 6.73 km
Therefore, the distance of the fourth leg and the angle is Ф = 29.94 degrees and d = 6.73 km
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Write a 150-word introduction about Tolerance of a measurement value? I
A measurement's tolerance is the allowed range or variance that a value can fall inside and still be regarded as accurate or acceptable.
Tolerance is crucial in many industries, including manufacturing, engineering, and quality control, to guarantee the accuracy and consistency of measurements. It offers a clearly defined upper limit that specifies how much deviation from a target or specified value is allowed without impairing a product's or process's operation or quality.
Measurement variance that results from things like equipment constraints, climatic circumstances, and production differences is accounted for by tolerance. In order to preserve accuracy, consistency, and conformity with required standards or specifications, it is essential to establish the proper tolerance levels. Professionals may make wise decisions, spot discrepancies, and apply the necessary corrective measures to ensure the accuracy and dependability of measurement values by comprehending and executing tolerance efficiently.
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. What is the expectation value of the linear momentum for the 1−D wavefunction: ψ(x)=Ne
−ax
2
, where −[infinity]
The expectation value of the linear momentum for the given wavefunction is -2iħ/(e² * x).
To calculate the expectation value of the linear momentum for the given one-dimensional wavefunction ψ(x) = Ne, we need to evaluate the integral of the momentum operator multiplied by the square of the wavefunction, and then normalize it.
The linear momentum operator in one dimension is represented as Ȧ = -iħ(d/dx).
The expectation value of linear momentum (p) is given by:
⟨p⟩ = ∫ ψ*(x) Ȧ ψ(x) dx
Substituting the given wavefunction:
ψ(x) = Ne
⟨p⟩ = ∫ (Ne)*(-iħ)(d/dx)(Ne) dx
Simplifying:
⟨p⟩ = -iħN² ∫ (d/dx)(e*e) dx
Using the product rule of differentiation:
⟨p⟩ = -iħN² ∫ (ede/dx + ede/dx) dx
⟨p⟩ = -2iħN² ∫ e*(de/dx) dx
Integrating the expression:
⟨p⟩ = -2iħN² ∫ de
The integration of de is simply e.
⟨p⟩ = -2iħN² * e
To calculate the normalization constant N, we need to integrate the square of the wavefunction over the entire space:
∫ |ψ(x)|² dx = 1
∫ |Ne|² dx = 1
N² ∫ e*e dx = 1
N² * ∫ e² dx = 1
N² * e² ∫ dx = 1
N² * e² * x = 1
N² = 1/(e² * x)
Substituting the value of N² back into the expression for ⟨p⟩:
⟨p⟩ = -2iħ/(e² * x)
Therefore, the expectation value of the linear momentum for the given wavefunction is -2iħ/(e² * x).
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The fracture strength of bi-tempered glass averages 14.03 (measured in thousands of pounds per square inch) and has standard deviation 2. Suppos randomly select 100 pieces of bi-tempered glass. Let M be the random variable representing the mean fracture strength of the 100 selected pieces. be the random variable representing the sum of the fracture strengths of the 100 selected pieces.
a) What theorem will let us treat T and M as approximately normal random variables?
Monte Carlo Theorem
Central Limit Theorem
Law of Large Numbers
Convolution Theorem
Chebychev's Theorem
301 Theorem
b) What is the expected value of T? 1403
c) What is the standard deviation of T? 400
d) What is the approximate probability that T is greater than 1400? 1444.075
e) What is the 98th percentile of the approximate distribution of T?
f) What is the standard deviation of M? 0.04
g) What is the approximate probability M is greater than 13.99? 0.5793
h) What is the variance of 93M? 345.96
we get (a) Central limit theorem ; (b) expected value of T = 1403; (c) Standard deviation = 400;
(d) Probability of T greater than 1400 is 0.5038 ;(e) 98th percentile is 1803 ; (f) standard deviation of M = 0.2 (g) Probability of M = 0.5793 (h) Variance of 93M = 345.96
In brief :
a) Central Limit Theorem (CLT) is a theorem that will let us treat T and M as approximately normal random variables.
CLT establishes that the mean of a sufficiently large sample from any population has an approximately normal distribution, regardless of the population's shape.
b) The expected value of T is given by μT = 100 * μ = 100 * 14.03 = 1403.
c) The standard deviation of T is given by σT = √(100 * σ²) = √(100 * 2²) = 400.
d) The z-score is given by (1400 - 1403)/400 = -0.0075. Using the z-table, we find the area to the right of the z-score as 0.5038.
Therefore, the approximate probability that T is greater than 1400 is 0.5038.
e) To find the 98th percentile of the approximate distribution of T, we need to find the z-score corresponding to the area of 0.98 in the standard normal distribution. Using the z-table, we find this z-score to be 2.05.
Therefore, the 98th percentile of the approximate distribution of T is 1403 + 2.05 * 400 = 1803.
f) The standard deviation of M is given by σM = σ/√n = 2/√100 = 0.2.
g) The z-score is given by (13.99 - 14.03)/0.2 = -0.2.
Using the z-table, we find the area to the right of the z-score as 0.5793. Therefore, the approximate probability that M is greater than 13.99 is 0.5793.
h) The variance of 93M is given by (93)² * Var(M) = (93)² * (σ²/n) = (93)² * (2²/100) = 345.96.
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Now we have a rod-shaped space station of length 1232 m and mass 4.24 x 10^6 kg, which can change its length (kind of like an old-fashioned telescope), without changing its overall mass. Suppose that the station is initially rotating at a constant rate of 2.41 rpm. If the length of the rod is reduced to 2.41 m, what will be the new rotation rate of the space station? a. 2.14 rpm b. 4.46 rpm c. 3.57 rpm d. 5.35 rpm
The new rotation rate of the space station, when the length of the rod is reduced to 2.41 m, is approximately 4.46 rpm. Option B is correct.
To solve this problem, we can use the principle of conservation of angular momentum. The angular momentum of the space station is conserved when the length of the rod is reduced.
The angular momentum of the space station is given by:
L1 = I1 * ω1
where L1 is the initial angular momentum, I1 is the moment of inertia, and ω1 is the initial angular velocity.
The moment of inertia of a rod rotating about its center is given by:
I1 = (1/12) * m * L1²
where m is the mass of the rod and L1 is the initial length of the rod.
Now, when the length of the rod is reduced to 2.41 m, the new moment of inertia becomes:
I2 = (1/12) * m * (2.41 m)²
The final angular velocity, ω2, can be calculated by rearranging the equation for angular momentum:
L2 = I2 * ω2
Since angular momentum is conserved, we have L1 = L2.
Therefore, we can set up the equation:
I1 * ω1 = I2 * ω2
Substituting the expressions for I1 and I2, we get:
(1/12) * m * L1² * ω1 = (1/12) * m * (2.41 m)² * ω2
Simplifying and solving for ω2, we find:
ω2 = (L1² * ω1) / (2.41 m)²
Substituting the given values, we get:
ω2 = (2.41 rpm)² * (2.41 rpm) / (1232 m)²
Evaluating this expression, we find:
ω2 = 4.46 rpm
Therefore, when the length of the rod is shortened to 2.41 m, the new rotation rate of the space station is roughly 4.46 rpm. Option B is correct.
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A horizontal wire of length 0.19 m, carrying a current of 7.6 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 17°, it experiences a magnetic force of 6.2 x 10-³ N. Determine the magnitude of the external magnetic field.
The magnitude of the external magnetic field is approximately 0.194 Tesla.
To solve this problem, we can use the equation for the magnetic force on a current-carrying wire:
F = BILsinθ
where F is the magnetic force, B is the magnitude of the magnetic field, I is the current, L is the length of the wire, and θ is the angle between the wire and the magnetic field.
Given:
Length of the wire, L = 0.19 m
Current, I = 7.6 A
Angle, θ = 17°
Force, F = 6.2 x [tex]10^{-3}[/tex]N
Substituting the given values into the equation, we have:
6.2 x [tex]10^{-3}[/tex] N = B * 0.19 m * 7.6 A * sin(17°)
Simplifying the equation, we can solve for B:
B = (6.2 x [tex]10^{-3}[/tex] N) / (0.19 m * 7.6 A * sin(17°))
Calculating this expression, we find:
B ≈ 0.194 T
Therefore, the magnitude of the external magnetic field is approximately 0.194 Tesla.
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Destiny is eating lunch at her favorite cafe when her friend Jada calls and says she wants to meet her. Jada is calling from a city 65 miles65 miles away and wants to meet Destiny somewhere between the two locations. Jada says she will start driving right away, but Destiny needs 10 min10 min to finish her lunch before she can begin driving.
Jada plans to drive at 55 mph,55 mph, whereas Destiny usually averages about 80 mph.80 mph. Ignore acceleration and assume the highway is a straight line.
a.) How many minutes meettmeet will Jada be driving before she meets Destiny?
b.) How many miles d will Destiny have traveled when they meet?
Jada will be driving for about 32 minutes before meeting Destiny, and they will meet after covering about 51.55 miles.
a) To find the time Jada will drive before meeting Destiny, we can use the formula:
distance = speed × time
Since Jada is traveling at a speed of 55 mph and she will drive for t hours before meeting Destiny, the distance she will have covered before meeting Destiny will be
distance1 = 55t
Now, let's find the distance Destiny will cover in t hours, and add the 10 min she needs to finish lunch before setting off:
distance2 = 80(t + 10/60)
The two distances are the same because the two friends will meet in the middle. Therefore:
distance1 = distance2
55t = 80(t + 1/6)
55t = 80t + 40/3
25t = 40/3
t = 8/15 hours
We need the time in minutes, so:
t = 8/15 hours × 60 minutes/hour ≈ 32 minutes
Therefore, Jada will be driving for about 32 minutes before meeting Destiny.
b) We already know that Jada will be driving for about 32 minutes before meeting Destiny. Since she drives at a constant speed of 55 mph, we can use the formula:
distance = speed × time
So the distance Jada will have covered before meeting Destiny is:
d1 = 55 × 32/60 miles ≈ 29.33 miles
The distance Destiny will have traveled can be found by plugging in t = 8/15 hours into the equation we used earlier:
distance2 = 80(t + 10/60) ≈ 22.22 miles
Therefore, they will meet after covering about 29.33 + 22.22 ≈ 51.55 miles.
Hence, Jada will be driving for about 32 minutes before meeting Destiny, and they will meet after covering about 51.55 miles.
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In the 1992 presidential election, Alavas 40 election districts averaged 1860 votes per dintrict for President Clinton. The standard deviation was 539. (There are only 40 election ditricts in Alasia.) The distribution of the votes per district for President Clinton was bell-shaped. Lat X a number of votes for President Clinton for an election district. (Sources The World Almanac and Book of Facta) Round all answers except part e. to 4 decimal places.
At least 75% of the districts had vote tallies between 781 and 2939 votes.
In the 1992 presidential election, Alavas 40 election districts averaged 1860 votes per district for President Clinton.
The standard deviation was 539.The distribution of the votes per district for President Clinton was bell-shaped.
Let X be the number of votes for President Clinton for an election district. The mean of the distribution is given as μ = 1860 and the standard deviation as σ = 539.
Using Chebyshev's theorem, the proportion of districts that got between 781 and 2939 votes is given by:
P(μ - 2σ ≤ X ≤ μ + 2σ) ≥ 1 - 1/k²
where k is the number of standard deviations from the mean that covers the desired interval.
In this case, the interval of interest is 781 ≤ X ≤ 2939
Therefore, the number of standard deviations that this interval covers is:
(781 - μ)/σ ≤ k ≤ (2939 - μ)/σ
⇒ (-1079)/539 ≤ k ≤ (1079)/539
⇒ -2 ≤ k ≤ 2
The interval of interest contains all X values that are within two standard deviations from the mean.
Using Chebyshev's theorem, P(μ - 2σ ≤ X ≤ μ + 2σ) ≥ 1 - 1/k²≥ 1 - 1/2² = 0.75
The lower bound of the interval (781) is 2 standard deviations below the mean.
The upper bound of the interval (2939) is 2 standard deviations above the mean.
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1) Please list the different modes (types) of heat transfer? Please provide definition, drawing and equations of each mode? 2) In this semester we also discussed that heat or thermal energy absorbed (
The following are the different types (modes) of heat transfer:ConductionHeat conduction (or thermal conduction) is the process of transferring heat between objects in contact with each other. It occurs when heat flows from an object with a higher temperature to an object with a lower temperature.
This can be represented by the following equation:Q = kA (T2 - T1)/L
where,
Q is the heat transferred,
k is the thermal conductivity of the material,
A is the surface area of the object,
T1 and T2 are the temperatures of the two objects,
L is the distance between them.
ConvectionHeat convection (or thermal convection) is the transfer of heat between a surface and a fluid (such as air or water) that is in motion. It occurs when the fluid carries heat away from the surface and replaces it with cooler fluid. This can be represented by the following equation:Q = hA (T2 - T1)where Q is the heat transferred, h is the heat transfer coefficient, A is the surface area of the object, T1 and T2 are the temperatures of the two objects, and L is the distance between them.RadiationHeat radiation (or thermal radiation) is the transfer of heat between two objects without any contact or movement between them. It occurs when objects emit electromagnetic waves that are absorbed by other objects. This can be represented by the following equation:Q = εσA (T2^4 - T1^4)where Q is the heat transferred, ε is the emissivity of the material, σ is the Stefan-Boltzmann constant, A is the surface area of the object, and T1 and T2 are the temperatures of the two objects.
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A basketball is dropped from a height of 1.5M and will rebound to a height of 0.9M. What is the coefficient of restitution?
The coefficient of restitution is the ratio of the velocity of the first object after the collision to the velocity of the second object before the collision. It represents how "bouncy" an object is. It is denoted by the symbol e.
The coefficient of restitution can be calculated using the following formula: e = h/h0, where h is the height to which the object rebounds, and h0 is the height from which it was dropped. In this problem, a basketball is dropped from a height of 1.5 m and rebounds to a height of 0.9 m. Therefore,
e = h/h0 = 0.9/1.5 = 0.6.
This means that the coefficient of restitution is 0.6. In this question, a basketball is dropped from a height of 1.5 meters and rebounds to a height of 0.9 meters. To find the coefficient of restitution, we can use the formula e = h/h0, where e is the coefficient of restitution, h is the height to which the object rebounds, and h0 is the height from which it was dropped. Using this formula, we get:
e = h/h0 = 0.9/1.5 = 0.6
Therefore, the coefficient of restitution is 0.6. This means that when the basketball collides with the ground, it loses 40% of its energy. In other words, it is not very "bouncy." A higher coefficient of restitution means that the object is more "bouncy" and will rebound to a greater height. A lower coefficient of restitution means that the object is less "bouncy" and will rebound to a lower height. The coefficient of restitution can be affected by many factors, such as the material of the object, the temperature, and the angle of the collision.
In conclusion, the coefficient of restitution is a measure of how "bouncy" an object is. It represents the ratio of the velocity of the first object after the collision to the velocity of the second object before the collision. In this problem, the coefficient of restitution of the basketball is 0.6, which means that it is not very "bouncy" and loses 40% of its energy when it collides with the ground.
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You want to have a subject exercise at 125 Watts with an RPM of
60 for 3 minutes. What resistance (in SI units) do you set the
cycle ergometer to (include your units
To determine the resistance in SI units that you need to set the cycle ergometer to, given that you want to have a subject exercise at 125 watts with an RPM of 60 for 3 minutes, follow the steps below:
Step 1: Determine the energy used in Joules during the 3 minutes at 125 watts.
P = W / tWhere:
P = power (125 watts)t = time (3 minutes converted to seconds
= 3 × 60 = 180 seconds)
W = energy used in Joules (to be determined)
Substituting the given values:
P = W / t125
= W / 180W
= 125 × 180W
= 22,500 Joules
Step 2: Determine the work done (in Joules) per revolution (360 degrees).
Work done per revolution = energy used in Joules / number of revolutions per minute / 60
Where:number of revolutions per minute = RPM / 60
Substituting the given values:
Work done per revolution = 22,500 / (60 / 60) / 360
Work done per revolution = 22,500 / 1 / 360
Work done per revolution = 22,500 × 360
Work done per revolution = 8,100,000 Joules
Step 3: Determine the torque needed to perform one revolution (360 degrees) of the pedals in SI units (N-m).Torque = work done per revolution / (2 × π)
Where:
2 × π = 6.2832
Substituting the given values:Torque = 8,100,000 / 6.2832
Torque = 1,288,684.08 N-m
Step 4:
Determine the resistance (force) needed at the pedals in Newtons (N) to produce the required torque.Resistance = Torque / pedal radius
Where:pedal radius = 0.175 m (average for a cycle ergometer)
Substituting the given values:
Resistance = 1,288,684.08 / 0.175
Resistance = 7,358,971.89 N (Newtons)
Therefore, you would need to set the resistance to 7,358,971.89 N (Newtons) on the cycle ergometer to achieve the desired subject exercise at 125 Watts with an RPM of 60 for 3 minutes.
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A car is to turn a curve track of radius 120 m at a speed of 85 km/h. How large must the coefficient of static friction be between the car's tire and the road to maintain safe traveling? O / 23.6 m/s O 26.3 m/s 32.6 m/s 36.2 m/s
The coefficient of static friction to be between the car's tire and the road to maintain safe traveling is 23.6 m/s. Hence, option A is correct.
According to question:
A car is to turn a curve track of radius 120 m at a speed of 85 km/h.
So, to find coefficient of static friction be between the car's tire and the road,
r = 120 m
v = 85 km/h
fs = mv²/ r
μs m g = mv²/ r
μs = v²/ rg
= (85 × 5/18)²/ 120 × 9.8
μs = 557.5/1176
μs = 0.47
v = 85 × 5/18
v = 23.6 m/s
Thus, the coefficient of static friction to be between the car's tire and the road to maintain safe traveling is 23.6 m/s.
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The temperature, u(x,t), of a metal bar of length 1 = 2.5 at a distance x from one end and at time t is modelled by the partial differential equation: Du/dt = a a2u/ax2
for 0 < x < 2.5 and t > 0. The metal has a thermal diffusivity a = 1.5 and the two ends of the bar are kept at a temperature, u(0,t) = u(2.5, t) = 0 and the initial temperature distribution is given by: u(x,0) = 2sin(╥x/l) (a) State the forward difference approximation for du/ât and du/ox and the central difference approximation, a2u/ax2
(b) Deduce the numerical scheme for approximating u(x, t) from the values of u(x, t) at the previous time step [2 marks] (c) Confirm that the choice of &x = 0.5 and 8t = 0.05 will yield a stable solution. (1 Mark) (d) Use the explicit difference scheme with 8x = 0.5 and 8t = 0.05 to approximate = u(x,t) at times t = 8t and t = 28t. [5 Marks)
(a) Forward difference approximation:
(∂u/∂t)ᵢⱼ ≈ (uᵢⱼ₊₁ - uᵢⱼ)/Δt
(∂u/∂x)ᵢⱼ ≈ (uᵢ₊₁ⱼ - uᵢⱼ)/Δx
Central difference approximation: (∂²u/∂x²)ᵢⱼ ≈ (uᵢ₊₁ⱼ - 2uᵢⱼ + uᵢ₋₁ⱼ)/Δx²
(b) Numerical scheme: uᵢⱼ₊₁ = uᵢⱼ + (a * Δt/Δx²) * (uᵢ₊₁ⱼ - 2uᵢⱼ + uᵢ₋₁ⱼ)
(c) For stability, the coefficient a * Δt/Δx² should be less than or equal to 0.5.
(d) To approximate u(x, t) at times t = 8t and t = 28t, we need to apply the numerical scheme iteratively using the given values of Δx = 0.5 and Δt = 0.05.
(a) The forward difference approximation for du/dt can be obtained by using the forward difference operator:
(∂u/∂t)ᵢⱼ ≈ (uᵢⱼ₊₁ - uᵢⱼ)/Δt
where (∂u/∂t)ᵢⱼ represents the approximation of du/dt at grid point (i, j), uᵢⱼ₊₁ is the temperature at the next time step, and Δt is the time step size.
Similarly, the forward difference approximation for du/dx can be obtained by using the forward difference operator:
(∂u/∂x)ᵢⱼ ≈ (uᵢ₊₁ⱼ - uᵢⱼ)/Δx
where (∂u/∂x)ᵢⱼ represents the approximation of du/dx at grid point (i, j), uᵢ₊₁ⱼ is the temperature at the next grid point in the x-direction, and Δx is the grid spacing in the x-direction.
The central difference approximation for a²u/∂x² can be obtained by using the central difference operator:
(∂²u/∂x²)ᵢⱼ ≈ (uᵢ₊₁ⱼ - 2uᵢⱼ + uᵢ₋₁ⱼ)/Δx²
where (∂²u/∂x²)ᵢⱼ represents the approximation of a²u/∂x² at grid point (i, j), uᵢ₊₁ⱼ and uᵢ₋₁ⱼ are the temperatures at the neighboring grid points in the x-direction, and Δx is the grid spacing in the x-direction.
(b) The numerical scheme for approximating u(x, t) can be obtained by substituting the forward difference approximations into the given partial differential equation:
Du/dt = a * a²u/∂x²
Using the forward difference approximations, we have:
(uᵢⱼ₊₁ - uᵢⱼ)/Δt = a * (uᵢ₊₁ⱼ - 2uᵢⱼ + uᵢ₋₁ⱼ)/Δx²
Simplifying the equation, we can rearrange it to solve for uᵢⱼ₊₁:
uᵢⱼ₊₁ = uᵢⱼ + (a * Δt/Δx²) * (uᵢ₊₁ⱼ - 2uᵢⱼ + uᵢ₋₁ⱼ)
This equation represents the numerical scheme for approximating u(x, t) at the next time step using the values of u(x, t) at the previous time step.
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Its better to type the answer to me or if it is handwriting please write it clear and I can earsliy read the answer! please thank you! Best wishes
Someone enters the room from Question #3 and takes out the light bulb. What color does the fire truck appear to be now? What about the walls of the room?
Next, someone enters the same room and installs a new light bulb that only produces red light. What color does the fire truck appear to be now? What about the walls of the room? Explain.
In a room lit by white light, you see a yellow shirt. (You see yellow when both green and red light reach your eyes together).
What kinds of light is the shirt reflecting? What kinds of light is the shirt absorbing?
If the room is lit only by red light instead, what will the shirt look like? Explain.
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Why does a solar nebula flatten into a disk instead of a sphere, even though the gravity of a nebula pulls in all directions?
A This flattening occurs because the initial shape of the nebula is already somewhat flat.
B This flattening is a natural consequence of collisions between particles in a spinning cloud.
C. This flattening occurs because of gravitational influences of nearby stars.
D. This flattening occurs because the temperature of the solar nebula decreased as it collapsed.
Solar nebula flattening is a natural consequence of collisions between particles in a spinning cloud. therefore, option B is correct.
When a solar nebula collapses under its own gravity, it begins to spin due to the conservation of angular momentum. As the cloud spins, particles within it collide and interact. These collisions cause the cloud to flatten into a disk shape rather than remaining spherical.
Angular momentum plays a crucial role in this process. The initial slight asymmetry or irregularity in the nebula's shape leads to variations in the speeds and directions of the particles' motions. As particles collide and transfer momentum, their motion tends to align along the rotational axis of the cloud, promoting the formation of a flattened disk structure.
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An experimental drug is being tested on mice.Different mice were given different dosages of the drug and, among other things, the heartrates of the mice were measured an hour after the drug was ingested.For a random sample of 72 mice, the sample correlation coefficient relating the dosage and heartrate was -0.18. Based on this information, test whether there is a significant linear relationship between the drug dosage and the heartrate (Assume that the two variables have a bivariate normal distribution.) Use the o.os level of significance, and perform a two- tailed test.Then complete the parts below. (If necessary, consult a list of formulas.)
There is no significant linear relationship between the two variables, i.e., drug dosage and heart rate of mice.
To test the linear relationship between the two variables, we will perform a hypothesis test with the following hypothesis:
Null Hypothesis:
H0: ρ=0 (There is no significant linear relationship between the two variables)
Alternate Hypothesis: Ha: ρ≠0 (There is a significant linear relationship between the two variables)
The test is a two-tailed test with a significance level of α=0.05.
Since we have a sample size of n=72, we can use the sample correlation coefficient as a test statistic. We will use the critical value approach to test the hypothesis.
Test Statistic: r = -0.18
The critical values for a two-tailed test with α=0.05 are given by:± zα/2 = ±1.96, where zα/2 is the critical value of the standard normal distribution at α/2=0.025 level of significance.
Decision Rule: Reject H0 if |r| > zα/2Otherwise, Fail to reject H0.
Since |r| < zα/2, we fail to reject H0.
Hence, there is not enough evidence to conclude that there is a significant linear relationship between the drug dosage and heart rate of mice.
Therefore, we conclude that there is no significant linear relationship between the two variables, i.e., drug dosage and heart rate of mice.
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After learning the Leg workout, summarize your takeaways by answering these 3 questions. WHAT ARE WE LEARNING TODAY? O WHY ARE WE LEARNING IT? HOW WILL I KNOW I HAVE LEARNED IT?
Learning some crucial leg training routines today as part of our leg exercise lesson.
Deadlifts, Squats, and lunges are the fundamental lower body exercises that should make up the majority of your programming. These exercises naturally concentrate on the primary leg muscular groups, the glutes, quadriceps, hamstrings, and calves.
Studying leg exercises to help us build stronger, better-shaped leg muscles, as exercise is always beneficial to our health.
The best approach to determine if you have retained it or not is to practice your own reactions. Your growth with your leg muscles and form may also be seen.
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ACTIVITY 4
Applying the equation learned, answer the following problems:
1. A bowling ball whose mass is 4.0 kg is rolling at a rate of 2.5 m/s. What is its momentum? p = m/s. What Is Its Momentum?
Given:
Find:
Formula:
Solution:
2. A skateboard is rolling at a velocity of 3.0 m/s with a momentum of 6.0 kg-m/s. What is its mass?
Given:
Find:
Formula:
Solution:
3. A pitcher throws a baseball with a mass of 0.5 kg and a momentum of 10 kg-m/s. What is its velocity?
Given:
Find:
Formula:
Solution:
Subject Is Science
Good Perfect Complete=Brainlist
Copy Wrong Incomplete=Report
Good Luck Answer Brainly Users:-)
Answer:
1) 10 kg-m/s
2) 2 kg
3) 20 m/s
Explanation:
The momentum of an object can be calculated using the equation:
[tex]\large\boxed{p=mv}[/tex]
where:
p is momentum (measured in kilogram meters per second).m is mass (measured in kilograms).v is the velocity (measured in meters per second).[tex]\hrulefill[/tex]
Question 1For this question we need to find the momentum of a bowling ball whose mass is 4.0 kg is rolling at a rate of 2.5 m/s.
Given values:
m = 4.0 kgv = 2.5 m/sSubstitute the given values into the momentum formula and solve for p:
[tex]p=4.0\;\text{kg} \cdot 2.5\;\text{m/s}[/tex]
[tex]p=10\;\text{kg m/s}[/tex]
Therefore, the momentum of the bowling ball is 10 kg-m/s.
[tex]\hrulefill[/tex]
Question 2For this question we need to find the mass of a skateboard rolling at a velocity of 3.0 m/s with a momentum of 6.0 kg-m/s.
Given values:
p = 6.0 kg-m/sv = 3.0 m/sAs we want to find mass, rearrange the momentum formula to isolate m:
[tex]\large\boxed{m=\dfrac{p}{v}}[/tex]
Substitute the given values into the formula and solve for m:
[tex]m=\dfrac{6.0\; \text{kg m/s}}{3.0\; \text{m/s}}[/tex]
[tex]m=2\;\text{kg}[/tex]
Therefore, the mass of the skateboard is 2 kg.
[tex]\hrulefill[/tex]
Question 3For this question we need to find the velocity of a baseball with a mass of 0.5 kg and a momentum of 10 kg-m/s.
Given values:
p = 10 kg-m/sm = 0.5 kgAs we want to find velocity, rearrange the momentum formula to isolate v:
[tex]\large\boxed{v=\dfrac{p}{m}}[/tex]
Substitute the given values into the formula and solve for v:
[tex]v=\dfrac{10\; \text{kg m/s}}{0.5\; \text{kg}}[/tex]
[tex]v=20\;\text{m/s}[/tex]
Therefore, the velocity of the baseball is 20 m/s.
During a rescue operation, a 5300 kg helicopter hovers above a fixed point. The helicopter blades send air downward with a speed of 62.0 m/s.
What mass of air must pass through the blades every second to produce enough thrust for the helicopter to hover?
837.74 kilograms of air must pass through the blades every second to produce enough thrust for the helicopter to hover.
To determine the mass of air that must pass through the blades every second to produce enough thrust for the helicopter to hover, we can use the principle of conservation of momentum.
The thrust force exerted by the helicopter's blades is equal to the rate of change of momentum of the air.
Mathematically, we can express this as:
Thrust = Rate of change of momentum
The momentum of an object is defined as the product of its mass and velocity. In this case, the mass of air passing through the blades every second will have a velocity equal to the downward speed of the air expelled by the blades.
Let's denote the mass of air passing through the blades every second as "m" (in kilograms) and the downward speed of the air as "v" (in meters per second).
The momentum change of the air per second is given by:
Rate of change of momentum = mv
Since the helicopter is hovering, the thrust force must be equal to the weight of the helicopter. The weight of an object is given by the formula:
Weight = mass x gravity
In this case, the weight of the helicopter is equal to its mass (5300 kg) multiplied by the acceleration due to gravity (9.8 m/s²).
Now, equating the thrust force to the weight of the helicopter:
m v = 5300 kg x 9.8 m/s²
Solving for "m":
m = (5300 kg x 9.8 m/s²) / v
Substituting the given value for the downward speed of the air (v = 62.0 m/s) into the equation:
m = (5300 kg x 9.8 m/s²) / 62.0 m/s
m ≈ 837.74 kg
Therefore, approximately 837.74 kilograms of air must pass through the blades every second to produce enough thrust for the helicopter to hover.
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