Physics

Problem

A heavy ball of mass

M

is suspended from the ceiling of a car by a light string of mass

m

(

m \ll M

). When the car is at rest, the speed of transverse waves in the string is

60 \text{ ms}^{-1}

. When the car has acceleration

a

, the wave-speed increases to

60.5 \text{ ms}^{-1}

. The value of

a

, in terms of gravitational acceleration

g

, is closest to: a.

\frac{g}{30}

\frac{g}{5}

\frac{g}{10}

\frac{g}{20}