Circular Motion

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21.  A body moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R the ration of displacement to the covered path will be
A. ? RB. 2? R
C. zeroD. 4? R
22.  The angular speed for daily rotatio of earth in rad S-1 is
A. 2 ?B. ?
C. 4 ?D. 7.3 x 10-5 rads-1
23.  When a wheel 1 m in diameter makes 30 rev min the linear speed of point on its rim in ms-1 is
A. 2?B. ?/2
C. ?D. 20?
24.  A cyclist cycling around a circular racing track skids because
A. the centripetal force upon him is less than limiting frictionB. the centripetal force upon him is greater then limiting friction
C. the centripetal force upon him is equal to the limiting frictionD. the friction between the tyres of the cycle and road vanishes
25.  If a wheel of radius r turns through an angle of 30? then the distance through which any point on its rim moves is
A. ? /3 x rB. ?/6 x r
C. ?/30 x rD. ? / 180 x r
26.  In angular motion, Newtons second law of motion is
A. F=maB. F=?p/?t
C. ? = 1aD. all above
27.  Angular speed of seconds hand of a watch in rads-1 is
A. ?B. ?/2
C. ?/30D. ?/180
28.  The shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is
A. ?B. 3?
C. 6?D. 12?
29.  What is outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s?
A. 1NB. 10N
C. 2ND. 100N
30.  If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is
A. at the highest pointB. at the lowest point
C. at any point during motionD. at the point where gravity is not acting
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