Question

2.
A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/
s. A plumb bob is suspended from the roof of the car by a light rigid rod. The angle made by
the rod with the vertical is
A) Zero
B) 30°
C) 45°
D) 60°​

Answer 1

Tsinθ=rmv2​    [centripetal] ⟶(i)

Tcosθ=mg⟶(ii)  (force)

from (i) and (ii))

TcosθTsinθ​=rmv2​×mg1​

tanθ=rgv2​

Given that, radius =10 m

                  velocity =10 m/s

                             g=10m/s2

tanθ=10×10102​=1⇒θ=450​