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A Pendulum Bob Has Potential Energy U0 When Held Taut

Question 52

Multiple Choice

A pendulum bob has potential energy U0 when held taut in a horizontal position.The bob falls until it is 30° away from the horizontal position,when it has potential energy UA.It continues to fall until the string is vertical,when it has potential energy UB.Compare its potential energies at O,A,and B. A pendulum bob has potential energy U<sub>0</sub> when held taut in a horizontal position.The bob falls until it is 30° away from the horizontal position,when it has potential energy U<sub>A</sub>.It continues to fall until the string is vertical,when it has potential energy U<sub>B</sub>.Compare its potential energies at O,A,and B. A) U<sub>0</sub> = U<sub>A</sub> = U<sub>B</sub>. B) U<sub>A</sub> − U<sub>B</sub> = 2U<sub>0</sub>. C) U<sub>A</sub> − U<sub>B</sub> = U<sub>0</sub> − U<sub>A</sub>. D) U<sub>0</sub> = U<sub>B</sub> = 2U<sub>A</sub>. E) U<sub>0</sub> − U<sub>A</sub> = 2(U<sub>A</sub> − U<sub>B</sub>) .


A) U0 = UA = UB.
B) UA − UB = 2U0.
C) UA − UB = U0 − UA.
D) U0 = UB = 2UA.
E) U0 − UA = 2(UA − UB) .

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