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

Options

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

Answer

C

Explanation

`(mv^(2))/R = T sin theta and mg = T cos theta :. (v^(2))/(Rg) = tan theta `
Thus , `tan theta =(10^(2))/(10 xx10) =1 or theta = 45^(@)`