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##### 23. A cyclist cycling around a circular racing track skids becausea) The centripetal force upon him is less than limiting frictionb) The centripetal force upon him is greater than limiting frictionc) The centripetal force upon him is equal to the limiting frictiond) The friction between the tyres of the cycle and road vanishes

62. The weight of a man in an elevator moving down with an acceleration of 9.8 \mathrm{~m} / \mathrm{s}^{2} will becomea) Doubleb) Halfc) Zerod) Unchanged

A body of moment of inertia I=0.80 \mathrm{~kg} \mathrm{} \mathrm{m}^{2} about a fixed axis rotates with a constant angular velocity of 100 rad s^{-1} . Calculate its angular momentum L and the torque to sustain this motion.

9. When a body moves in a circle the angle between its linear velocity and angular velocity is always.a) 180^{\circ} b) 0^{\circ} c) 90^{\circ} d) 45^{\circ}

Explain how many minimum number of geo-stationary satellites are required for global coverage of T . V transmission?

45. The value of gravitational constant was determined bya) Newtonb) Keplerc) Cavendishd) Maxwell

A student holds two dumb-bells without stretched arms while sitting on a turn table. He is given a push until he is rotating at certain angular velocity. The student then pulls the dumbbell towards his chest (Fig. 5.25). What will be the effect on rate of rotation?