A bob is suspended by a long string from the ceiling of a bus that accelerates…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

2\,\text{kg}

bob is suspended by a

1\,\text{m}

long string from the ceiling of a bus that accelerates horizontally at

2\,\text{m}\,\text{s}^{-2}

. When the bob is in equilibrium relative to the bus, what angle

\theta

does the string make with the vertical? (a)

\theta \approx 21^{\circ}

(b)

\theta \approx 78.5^{\circ}

(c)

\theta \approx 11.5^{\circ}

(d)

\theta \approx 14.4^{\circ}