A powered theatre fly system raises a scenery panel vertically through 4.0 m at constant speed. During the lift, the motor of the fly system transfers 7.2 kJ of energy. The thermal energy stores of the motor, pulleys and surroundings gain 1.2 kJ. The rest of the energy is transferred to the gravitational potential energy store of the panel and Earth.
What is the weight of the scenery panel?
1500 N1500\ \mathrm{N}1500 N
2100 N2100\ \mathrm{N}2100 N
1800 N1800\ \mathrm{N}1800 N
300 N300\ \mathrm{N}300 N
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.