12/24/2018
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Quiz 003
5.1 Uniform Circular Motion
At what speed will a car round a 125 m radius curve, banked at a 45° angle, if no friction is required between the road and tires to
prevent the car from slipping? (g = 9.8 m/s2)
Select one:
a. 17 m/s
b. 27 m/s
c. 23 m/s
d. 35 m/s
Question 2
5.3 Newton's Law of Gravitation
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If a planet has 9 times the radius of the Earth, but has the same density as the Earth, what is the gravitational acceleration at the
surface of the planet? (g = 9.8 m/s2)
Select one:
a. 265 m/s2
b. 29.4 m/s2
c. 88.2 m/s2
d. 39.2 m/s2
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12/24/2018
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5.3 Newton's Law of Gravitation
Quiz 003
An Earth satellite is orbiting at a distance from the Earth's surface equal to two Earth radii. At this location, the acceleration due to
gravity is what factor times the value of g at the Earth's surface?
Select one:
a. 1/9
b. 1/4
c. There is no acceleration since the satellite is in orbit.
d. The answer is not given.
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Which of the following is that form of energy associated with an object's location in a conservative force field?
Select one:
a. thermal
b. potential
c. kinetic
d. bio-chemical
Question 5
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Three different mass projectiles are launched from the top of a building each at different angles of elevation. Each particle has the
same initial kinetic energy. Which particle has the greatest kinetic energy just as it impacts with the ground?
Select one:
a. They all will have the same kinetic energy on impact.
b. The one with the lowest mass.
c. The one launched at the highest angle of elevation.
d. The one with the highest mass.
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12/24/2018
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Quiz 003
A 180-hp engine can deliver, in SI units, an average power of ____. (1 hp = 746 W)
Select one:
a. 4.14 W
b. 0.24 W
c. 180 W
d. 926 W
e. 134 300 W
Question 7
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The unit of power, watt, is dimensionally the same as:
Select one:
a. joule-second.
b. joule/meter.
c. joule/second.
d. joule-meter.
Question 8
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5.2 Examples of Circular Motion
An airplane in a wide sweeping "outside" loop can create 0-g inside the aircraft cabin. What must be the radius of curvature of the
flight path for an aircraft moving at 180 m/s to create a condition of "weightlessness" inside the aircraft?
Select one:
a. 2300 m
b. 3300 m
c. 1150 m
d. 1800 m
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Question 9
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Quiz 003
A Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position.
Under double the compression, the spring is now used to launch the mass. How high does the mass now rise above its starting
position?
Select one:
a. 3 h
b. 4 h
c. 2 h
d. 1.41 h
Question 10
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5.1 Uniform Circular Motion
What centripetal force does an 60-kg passenger experience when seated 12 m from the center of a Ferris wheel that rotates once
every 4π seconds?
Select one:
a. 914 N
b. 240 N
c. 180 N
d. 484 N
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