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Q.

Figure shows the kinetic energy K of a simple pendulum versus its angle θ  from the vertical. The pendulum bob has mass 0.2 kg. Then the length of the pendulum in centimeters is ____  g=10 m/s2.
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answer is 150.

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Detailed Solution

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12mVm2=15×103

Vm=0.150m/s

Aω=0.150m/s

Lqm=gL=0.150m/s

gL=0.150100×1030.1500.1=1.5m

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