An electric pump is used to raise water from an underground reservoir to a header tank located on the roof of a building. Every minute, the pump raises 15 kg15\text{ kg}15 kg of water through a vertical height of 8 m8\text{ m}8 m.
Calculate the increase in the gravitational potential energy of the 15 kg15\text{ kg}15 kg of water when it is raised 8 m8\text{ m}8 m.
Calculate the useful power output of the pump as it raises the water.
(Take the acceleration due to gravity g=9.8 m/s2g = 9.8\text{ m/s}^2g=9.8 m/s2 or 10 m/s210\text{ m/s}^210 m/s2)
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.