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Q.

A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/s. A plumb bob is suspended from the roof of the car by a light rigid rod of length 1.00 m. The angle made by the rod with the track is

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a

zero

b

30∘

c

45∘

d

60∘

answer is C.

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Detailed Solution

The different forces acting on the bob are shown inFrom figure we havemgsin⁡θ=mv2Rcos⁡θ∴ tan⁡θ=v2gR=(10)210×10=1θ=tan−1⁡(1)=45∘

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