A heavy particle is tied to the end A of a string of length 1.6 m. Its other end O is fixed. It revolves as a conical pendulum with the string making 60° with the vertical. Then
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Question

A heavy particle is tied to the end A of a string of length 1.6 m. Its other end O is fixed. It revolves as a conical pendulum with the string making 60° with the vertical. Then

G1 Physics · Accepted Answer

For a conical pendulum, T cos60°=mg, so T=2mg. Also ω²=g/(ℓ cos60°), giving period 4π/7 s. The radius is ℓsin60°, so v=2.8√3 m/s and a(c)=g tan60°=9.8√3 m/s². Hence all A-D are correct.