Physics

Problem

A light, non-stretching string is wrapped around a small pulley of radius

R

. The string is pulled so that the pulley undergoes an angular acceleration

\alpha

. Which of the following gives the magnitude of the linear acceleration

a

of a point on the rim during this interval? a)

a = \dfrac{1}{2}\,\alpha R

a = \sqrt{2}\,\alpha R

a = \alpha R

a = 2\,\alpha R