A stubborn bolt requires a torque of (45 , N ,

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

Problem

A stubborn bolt requires a torque of

45\,\text{N}\,\cdot\,\text{m}

to loosen. You have a wrench that is

25\,\text{cm}

long, and you can pull only at an angle of

70^{\circ}

relative to the wrench handle. What minimum magnitude of force must you exert? (a)

5.3\times10^{2}\,\text{N}

(b)

3.0\times10^{2}\,\text{N}

(c)

1.9\times10^{2}\,\text{N}

(d)

2.3\times10^{2}\,\text{N}