A car is moving in a circular horizontal track of radius 10 m`s^(-1)` with a constant speed of 10 ms. A plumb-bob is suspended from the roof of car by a light rigid rod of length 1 m. The angle made by the rod with the track is (8 = 10 `ms^(-2)`):

Options

A. zero
B. `30^(@)`
C. `45^(@)`
D. `60^(@)`

Answer

C

Explanation

Here ,`tantheta=(v^(2))/(r.g)=(10xx10)/(10xx10)=1` or `theta=45^(@)`