A simple pendulum of length l is suspended from the ceiling of a trolley which is moving, without friction, down an inclined plane of inclination . The time period of the pendulum is given by T=2π√lgeff where geff is given by
A
g
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B
g sin θ
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C
g cos θ
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D
g tan θ
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Solution
The correct option is C g cos θ The correct choice is (b) since the component of the acceleration due to gravity perpendicular to the plane is g cos θ