Question

A car is moving with a constant speed of $20\, m / s$ in a circular horizontal track of radius $40\, m$ A bob is suspended from the roof of the car by a massless string The angle made by the string with the vertical will be : (Take $g=10 \, m / s ^2$ )

• A. $\frac{\pi}{6}$
• B. $\frac{\pi}{2}$
• C. $\frac{\pi}{4}$
• D. $\frac{\pi}{3}$

Answer 1

Answer: (C)

$\frac{\pi}{4}$

Answer 2

Tsinθ=Rml2​
tanθ=Rgv2​
tanθ=40×10202​
tanθ=1
⇒θ=4π​