© Copyright, Department of Physics, University of Illinois at Urbana-Champaign

Pendulum in Car

A 0.6 kg sphere hangs on a string from the ceiling of an automobile. The car has a constant horizontal acceleration and the string is displaced an angle θ = 65.2° from the vertical. To a person sitting inside the car, it appears that the sphere is motionless (the angle between the sphere and the vertical is constant).

What is the magnitude of the acceleration of the car?

|a| = m/s2