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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 7 - Work, Energy and Power > A bead of mass m is released from rest at A to move along the fixed smooth circular track as shown in figure. The ratio of magnitudes of centripetal force and normal reaction by the track on the bead at any point P0 described by the angle θ(≠0) would

A bead of mass m is released from rest at A to move along the fixed smooth circular track as shown in figure. The ratio of magnitudes of centripetal force and normal reaction by the track on the bead at any point P0 described by the angle θ(≠0) would

A person of mass 70kg jumps from a stationary helicopter with the parachute open. As he falls through 50 m height he gains a speed of 20 ms^−1. The work done by the viscous air drag is