1.

A simple pendulum is suspended vertically to the ceiling of compartment in a stationary train. If the 'train' is constantly accelerated by acceleration 'a' the angle theta which string makes with vertical is :

Answer»

zero
`tan^(-1)""(a)/(g)`
`sin^(-1)""(a)/(g)`
`cos^(-1)""(a)/(gg)`

SOLUTION :Let T be the tension in the string. Tension T can be resolved into two COMPONENTS, `T cos theta` and `T sin theta` as SHOWN in

`T sin theta=ma`
`T cos theta=mg`
`:.""tan theta=a//gimpliestheta=tan^(-1)(a//g)`
THUS correct choice is (B).


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