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Question

A pendulum of mass 1 kg and length l=1m is released from rest at angle θ=60 . The power delivered by all the forces acting on the bob at the angle θ=30 will be (g=10m/s2).

A
13.4 watt
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B
20.4 watt
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C
24.6 watt
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D
Zero
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Solution

The correct option is A 13.4 watt
h=l(cos30cos60)=1(0.860.5)=0.36m

v=2gh2×10×0.36=2.68m/s

p=mgsinθ

=1×10×sin30×2.68

=13.4watt

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