A pendulum bob of mass attached to a string of length is pulled aside by and held

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

A pendulum bob of mass

0.15\,\text{kg}

attached to a string of length

1.2\,\text{m}

is pulled aside by

3.0^\circ

and held. Calculate the magnitude of the restoring force acting on the bob at this instant. (Use

g = 9.8\,\text{m}\,\text{s}^{-2}

.) (a)

0.044\,\text{N}

(b)

0.052\,\text{N}

(c)

0.077\,\text{N}

(d)

0.78\,\text{N}