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A pendulum has length L = 1.8 m. The bob is released from position shown in the figure. Find the tension (in N) in the string when the bob reaches the lowest position. Mass of the bob is 1 kg.

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Detailed Solution

The bob will experience free fall for a distance of L = 1.8 m. Speed of the bob just before the string gets taut is u=2gL=2×10×1.8=6m/sut=ucos⁡30∘=3u2=33m/s12mV2=12mut2+mgL2V=35m/sT=10+451.8=35N

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A pendulum has length L = 1.8 m. The bob is released from position shown in the figure. Find the tension (in N) in the string when the bob reaches the lowest position. Mass of the bob is 1 kg.