Question

A pendulum of mass \( 1 \) kg and length \( l = 1 \) m is released from rest at an angle \( \theta = 60^\circ \). The power delivered by all the forces acting on the bob at angle \( \theta = 30^\circ \) will be (Take, \( g = 10 \) m/s\( ^2 \)):

• A. \( 13.4 \) W
• B. \( 20.4 \) W
• C. \( 24.6 \) W
• D. zero

Hint:

Power is given by \( P = F v \cos \theta \). For pendulum motion, velocity can be found using energy conservation.