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May 3, 2022

Home2022May03

14. The angular speed of a fly–wheel making 120 revolution/minute is

(a)       π rad/sec (b)  2π rad/sec                                     (c)   4 π rad/sec (d)  4π2 rad/sec Ans. c (55)

13. In rotational motion of a rigid body, all particle move with

(a)       Same linear and angular velocity (b)   Same linear and different angular velocity (c)   With different linear velocities and same...

12. Two particles of masses 1 kg and 3 kg move towards each other under their mutual force of attraction. No other force acts on them. When the relative velocity of approach of the two particles is 2m/s, their centre of mass has a velocity of 0.5 m/s. When the relative velocity of approach becomes 3 m/s, the velocity of the centre of mass is

(a)       0.5 m/s (b)  0.75 m/s (c)   1.25 m/s (d)  Zero Ans.a (12)

11. Three identical spheres, each of mass 1 kg are placed touching each other with their centres on a straight line. Their centres are marked K, L and M respectively. The distance of centre of mass of the system from K is

(a)   (KL+KM+LM)/3 (b)  (KL+KM)/3 (C)  (KL+LM)/3 (d)  (KM+LM)/3 Ans. b (36)
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