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Question

A car is moving in a circular horizontal track of radius 10m with a constant speed of 10m/s. A plumb bob is suspended from the roof of the car by a light rigid rod of length 1m. The angle made by the rod with track is

A
zero
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B
30o
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C
45o
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D
60o
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Solution

The correct option is C 45o
T cosθ = mg..........(1)
T Sinθ = mv2r.....(2)
Equn (2)/(1)
tanθ=v2rg=100100=1
I used g=10 and we get θ=450
959429_1022490_ans_93dee9f629c5480e8eaeaa2f9230d572.PNG

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