A uniform wooden beam long has a mass of and rests horizontally on supports at its…

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

Problem

A uniform wooden beam

4\,\text{m}

long has a mass of

20\,\text{kg}

and rests horizontally on supports at its two ends. A worker of mass

60\,\text{kg}

stands at a point

1\,\text{m}

from the left end. Taking

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

, calculate the reaction at the right support. (a)

392\,\text{N}

(b)

245\,\text{N}

(c)

196\,\text{N}

(d)

539\,\text{N}