A Pendulum Bob Has Potential Energy U₀ When Held Taut $\degree$

question 23

Multiple Choice

A pendulum bob has potential energy U₀ when held taut in a horizontal position.The bob falls until it is 30 $\degree$ away from the horizontal position,when it has potential energy U_A.It continues to fall until the string is vertical,when it has potential energy U_B.Compare its potential energies at O,A,and B.

• A)U₀ = U_A = U_B.
• B)U_A- U_B = 2U₀.
• C)U_A - U_B = U₀ - U_A.
• D)U₀ = U_B = 2U_A.
• E)U₀ - U_A = 2(U_A -U_B).

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