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Answer & Explanation:Physics qusetion.docx This document have 18 questions about physics, can you help me finish it?
physics_qusetion.docx

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QUESTION 1
1.
An object is dropped from 12 m. At what height in meters will its potential and kinetic energies be
equal? Ignore air resistance.
2 points
QUESTION 2
1.
A man pushes a lawn mower on level ground with a force of 200 N, 60% of which is in the horizontal
direction. He does this over a distance of 6.0 m in 10.0 s. How much power does he expend in Watts?
2 points
QUESTION 3
1.
Suppose Motor A has twice the horsepower as motor B. Then….
Motor A does half the work in twice the time as Motor B
Motor A does twice the work in half the time as Motor B
Motor A does half the work in half the time as Motor B
Motor A does twice the work in twice the time as Motor B
None of the above
2 points
QUESTION 4
1.
Which of the following can cause a change in linear momentum
A change in velocity
An acceleration
A change in mass
An unbalanced force
None of the above
2 points
QUESTION 5
1.
Calculate the magnitude of the linear momentum (in N•s) of a pickup truck that ahs a mass of 1000 kg
and is travelling eastward at 20 m/s. Answer in N•s.
2 points
QUESTION 6
1.
Two ice skaters stand together at rest and then push off. One skater’s mass is 75 kg and his speed after
pushing is 1.0 m/s to the left. What is the impulse delivered to the other ice skater? Answer in N•s.
2 points
QUESTION 7
1.
Two ice skaters stand together at rest and then push off. One skater’s mass is 75 kg and his speed after
pushing is 1.0 m/s to the left. If the other skater has a mass of 50 kg, what will be her speed (in m/s)?
Answer in m/s.
2 points
QUESTION 8
1.
Taking the density of air to be 1.29 kg/m3, what is the linear momentum of 1.00 L of air moving with a
wind speed of 36 km/h? Answer in N•s.
2 points
QUESTION 9
1.
A man tightens a bolt by applying a force of 100 N on the end of a wrench 0.20 m from the wrench’s
head (and the bolt). The force is applied perpendicularly to the wrench. What is the net torque in N•m?
2 points
QUESTION 10
1.
Where is the center of mass for the system? A ball of mass 2.0 kg is centered at (5.00 m, 0.00 m), a
second ball of mass 4.0 kg is centered at (0.00 m, 1.25 m). Determine the x-coordinate of the center of
mass in meters.
2 points (Extra Credit)
QUESTION 11
1.
Where is the center of mass for the system? A ball of mass 2.0 kg is centered at (5.00 m, 0.00 m), a
second ball of mass 4.0 kg is centered at (0.00 m, 1.25 m). Determine the y-coordinate of the center of
mass in meters.
2 points (Extra Credit)
QUESTION 12
1.
A comet goes around the Sun in an elliptical orbit.At its farthest point, 600 million miles from the sun,
it is travelling with a speed of 15 000 mi/h. How fast is it travelling at its closest approach to the sun, at
a distance of 100 million miles? Answer in mi/h.
2 points
QUESTION 13
1.
Angular momentum is conserved in the absence of which of the following?
Inertia
A net external torque
Gravity
Linear Momentum
None of the above
2 points
QUESTION 14
1.
The moment of inertia for a certain ~frictionless merry-go-round is 1000 kg•m2. A child of mass 30.0
kg is standing on the edge of the initiall stationary merry-go-round, which is 2.50 m from the center of
the merry-go-round. He begins to walk at an angular speed of 0.50 rad/s as seen by his mother, who is
sitting on the park bench nearby. What is the angular speed of the merry-go-round? Answer in rad/s.
2 points
QUESTION 15
1.
If a submerged object displaces a volume of liquid equal to its weight and is then released, what will
the object do?
Rise
Sink
Remain at the same position
Explode
2 points
QUESTION 16
1.
A ball with radius 8.00 cm and mass 6000 g is thrown into a freshwater lake. What fraction of the ball’s
volume will be underwater? You are solving for Vsubmerged/Vball, which is a unitless quantity.
2 points
QUESTION 17
1.
The ultimate tensile strenght of a certain steel wire is 5.0E+8 N/m2. The wire has a thickness of 0.25
mm. What is the maximum weight which can be suspended from this wire? Answer in N.
2 points
QUESTION 18
1.
A certain barometer reads a pressure of 101 kPa at the base of a building. The barometer is moved to
the top of the building, and it now reads 100.5 kPa. How tall is the building? Answer in m.
…
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