A metre stick of negligible mass is pivoted at the mark

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

Problem

A metre stick of negligible mass is pivoted at the

20\,\text{cm}

mark. A

5\,\text N

downward force is applied at the

0\,\text{cm}

mark and an

8\,\text N

downward force at the

100\,\text{cm}

mark. What upward force applied at the

60\,\text{cm}

mark will keep the stick in rotational equilibrium? (a)

5.4\,\text N

(b)

10.8\,\text N

(c)

13.0\,\text N

(d)

13.5\,\text N