24) A cylinder will slip on an inclined plane of inclination 0 if the coefficient of static friction between plane and cylinder is

25) Rate of change of angular momentum is equal to

26) If the angular distance, 0 = 2t3 - 3t2, the angular acceleration at t = 1 sec. is

27) A circular disc rotates at n rpm. The angular velocity of a circular ring of same mass and radius as the disc and to have the same angular momentum is

28) A particle moves in a straight line and its position is defined by the equation x = 6 t2 - t3 where t is expressed in seconds and x in meters. The maximum velocity during the motion is