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

Options

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

Answer

C

Explanation

`(v^(2))/(r)=g tan theta `
`=10xx tan 60 =10xx1.732`
`a_(r)=17.32 m//s^(2)`.