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##### 2. A hoop and disc have same mass and radius. Their rotational K.E are related by an equation.a) K . E_{\text {hoop }}=K . E_{\text {disc }} b) K . E_{\text {hoop }}=2 K . E_{\text {disc }} c) K . E_{\text {hoop }}=1 / 2 K . E_{\text {disc }} d) K . E_{\text {hoop }}=4 K . E_{\text {disc }}

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?