A stage-lighting bar is held horizontally and can turn about a pivot at one end. A support exerts an upward force of no more than 160 N, with a perpendicular distance of 0.75 m from the pivot. The bar's own weight produces a clockwise moment of 24 N m. A lamp is fixed to the bar with its weight acting 0.40 m from the pivot. What is the maximum weight of the lamp that can be supported in rotational equilibrium?
96 N96\ \mathrm{N}96 N
53 N53\ \mathrm{N}53 N
128 N128\ \mathrm{N}128 N
240 N240\ \mathrm{N}240 N
102 exam-style questions on Edexcel GCSE Physics 9.2 Moments, covering 9.2.1 Rotational effects of forces and moments, 9.2.2 The principle of moments, and 9.2.3 Levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.