A long uniform plank of mass rests horizontally on two sawhorses located at its ends

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

Problem

4.0\,\text{m}

long uniform plank of mass

30\,\text{kg}

rests horizontally on two sawhorses located at its ends. A

60\,\text{kg}

person stands

1.0\,\text{m}

from the left end. Assuming the plank remains perfectly horizontal, what upward force is exerted by the left sawhorse? (a)

735\,\text{N}

(b)

588\,\text{N}

(c)

441\,\text{N}

(d)

294\,\text{N}