In a closed system, the kinetic energy plus the potential energy is a constant.
a. True
b. False
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[Ques. 2] If the velocity of an aircraft is doubled, the kinetic energy of the aircraft is also doubled.
a. True
b. False
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[Ques. 3] The collision between two cars in an accident is an inelastic collision.
a. True
b. False
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[Ques. 4] When a car comes to a stop its kinetic energy is converted to internal energy in its brakes, heating them up.
a. True
b. False
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[Ques. 5] A spacecraft can gain energy by passing near a planet.
a. True
b. False
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[Ques. 6] When more people ride upward in an elevator, more power is required.
a. True
b. False
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[Ques. 7] A rocket can never go faster than the speed of its exhaust.
a. True
b. False
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[Ques. 8] A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, the person's power output is 1,200 W.
a. True
b. False
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[Ques. 9] A 2 kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s, and they stick together. After the collision, the velocity of the combined bodies is 0.8 m/s pointing towards the left.
a. True
b. False
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[Ques. 10] Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.When the box hits the floor its kinetic energy is converted into internal energy.
a. True
b. False
Indicate whether the statement is true or false
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