Physics (AS & A Level) · May / June 2021 · Paper 11 · Question 13

A uniform rigid bar XZ with negligible mass is 1.20 m long. The bar is pivoted at point P. Three coplanar forces act on the bar as shown. Forces of 16 N and 20 N act perpendicularly to the bar at points X and Y respectively. Force F acts at point Z at an angle of 30° to the axis of the bar. The distances along the bar of the pivot and of the forces are shown. The bar experiences a resultant moment about P of 6.0 N m in a clockwise direction. What is the magnitude of F?

1. A9.2 N
2. B11 N
3. C16 N
4. D24 N

As printed in the paper