Physics (AS & A Level) · Oct / Nov 2023 · Paper 13 · Question 11

A uniform rigid beam of length 3.2 m is pivoted at its centre. Two children sit at the opposite ends of the beam, as shown. One child has a mass of 24 kg. The other child has a mass of 36 kg. The heavier child causes one end of the beam to permanently rest on the ground, so that the beam makes an angle of 20° to the horizontal ground. What is the moment of the weight of the 24 kg child about the pivot?

1. A72 N m
2. B130 N m
3. C350 N m
4. D380 N m

As printed in the paper