Question

A plumb bob is hung from the ceiling of a train compartment.
The train moves on an inclined track of inclination 30° with
horizontal. The acceleration of train up the plane is a = g/2.
The angle which the string supporting the bob makes with
normal to the ceiling in equilibrium is
(1) 307
(2) tan-'(2/3)
(3) tan '3/2,
(4) tan (2)
Give answer with correct explanation ​

Answer 1

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