A student performs repetitive pull-up exercises. In each pull-up, the student lifts their body vertically through a distance of 0.55 m0.55\text{ m}0.55 m. The weight of the student is 540 N540\text{ N}540 N. Calculate the work done by the student in rising 0.55 m0.55\text{ m}0.55 m.
The chemical energy store in the student's body decreases as they do pull-up exercises. State two energy stores that increase as a result of energy transfers from the student's chemical energy store.
Another student transfers 4500 J4500\text{ J}4500 J of energy in a time of 50 s50\text{ s}50 s. Calculate the student's power when transferring this energy.
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.