Question

A simple pendulum with a bob of mass m is suspended from the roof of a car moving with horizontal acceleration a

(a) The string makes an angle of tan-1(a/g)

(b) The string makes an angle of sin-1(a/g)

(c) The tension in the string is m√(a2 + g2)

(d) The tension in the string is m√(g2 - a2)

Answer 1

Correct option (a) The string makes an angle of tan-1(a/g) and (c) The tension in the string is m√(a2 + g2)

Explanation :

At equilibrium , T sin θ = ma and T cos θ = mg