Question

A mass is suspended from the ceiling of a train carriage by a string. The string makes an angle θ with the vertical when the train is accelerating along a straight horizontal track. What is the acceleration of the train?

Answer 1

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Answer:

tan 5° $\frac{a}{g}$

Explanation:

Two forces acting on the bob are :

a.) weight mg acting vertically downward

b.) tension T acting along the string

Resolving T in horizontal ad vertical direction we find that,

T cos 5° mg

T sin 5° ma

dividing the both equations we get :

tan 5° $\frac{a}{g}$

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