On a calm day, a large decorative fountain propels 45 000 kg45\,000 \text{ kg}45000 kg of water per minute to a vertical height of 160 m160 \text{ m}160 m. Take the acceleration due to gravity, ggg, to be 10 m/s210 \text{ m/s}^210 m/s2.
Calculate the power used in raising the water.
The electrical pump operating the fountain has an efficiency of 75%75\%75%. Calculate the electrical power supplied to the pump.
On another day, a strong horizontal wind is blowing, causing the water jet to bend. Explain why the water still rises to a maximum height of 160 m160 \text{ m}160 m.
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.