Which of the following is NOT a unit for angle? (a) degree (b) rad (c) rev (d) r

Question

Which of the following is NOT a unit for angle? (a) degree (b) rad (c) rev (d) rpm 2. A car moves counterclockwise along a circular track. What is the angular displacement of the car after moving two complete laps ? (a) 0 rad (b) 2pi rad (c) 4pi rad (d)6pi rad 3. Impulse can be represented by (a) Deltap/Deltat (b) F middot Deltat (c) the change in kinetic energy. (d) the change in momentum. 4 An angle measures 7pi/8 rad is (a) 225* (b) 158* (c) 135* (c) 190* 5 A 0.5 kg ball moving at velocity of 3.0 m/s hits the ball and bounces back at the same speed, what is the momentum change of the ball? (a) 1.5 kgmiddotm/s (b) -1.5 kgmiddotm/s (c) 3.0 kgmiddotm/s (d) -3.0 kgmiddotm/s 6 Two balls collide in a head on elastic collision and rebound in opposite directions, which of the following is correct? (a) Their total momentum is conserved, but total kinetic energy is not. (b) Their total kinetic energy is conserved, but total momentum is not. (c) Their total kinetic and total momentum are both conserved. (d) Their total kinetic and total momentum are both conserved

Explanation / Answer

1. rpm is a unit of angular velocity and not a unit for angle
2. circular displacement after 2 laps = final position - initial position = 0
3. impulse = Fdt
4. 7pi/8 rad = 7*180/8 = 157.5 deg
5. momentum change = initial - final = mv - (-mv) = 2mv = 2*0.5*3 = 3 kgm/s
6. d) Their momentum and ke is conserved (elastic collision)

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