1) Which of the following is NOT a unit for angle? (A) deg (B) rad (C) rev (D) r

Question

1) Which of the following is NOT a unit for angle? (A) deg (B) rad (C) rev (D) rpm 2) A wheel spins 30 times in 6 seconds. Its period of revolution equals (A) 0.2 sec (B) 5 sec (C) 6 sec (D) 30 sec 3) A car moves at constant speed counterclockwise along a circular track. What is the direction of the centripetal force acting on the car when it reaches point P? (A) (C) (D) 4) A change or transfer of momentum is known as (A) energy (B) force. (C) impulse. (D) work 5) A ball is dropped from a very tall building. Ignore friction. As the ball falls, which of the following quantities is conserved? (A) Momentum only (B) Mechanical energy only (C) Both momentum and mechanical energy (D) Neither momentum nor mechanical energy

Explanation / Answer

1. D

rpm is the unit of angular velocity.

2. A

Period of revolution =6/30=0.2 sec

3. C

centripetal force directed radially inwards

4. B

Change of momenturm is force

5.C

both momentum and energy conserved

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