Physics (AS & A Level) · Oct / Nov 2021 · Paper 11 · Question 12

A shelf XY is 0.40 m long and is attached to a wall at end X. It is kept horizontal by a wire attached to Y and to the wall, as shown. [diagram: wall at X, shelf XY horizontal of length 0.40 m, wire from Y to wall, tension 15 N at 30° to the horizontal] The tension force in the wire is 15 N at an angle of 30° to the horizontal. What is the moment of this force about point X?

1. A3.0 N m
2. B5.2 N m
3. C6.9 N m
4. D12 N m

As printed in the paper