Energy Transfers In A System (GCSE Physics)

An LED has total power input 4.0 W and efficiency 0.85. What is the useful power output (W)?

A nuclear power station has a power output of 500 MW. Calculate the energy output in 3600 s. Give your answer in J.

Which energy store increases when water is heated?

Which equation links momentum p, mass m and velocity v?

A toy airplane is launched by a spring with k = 50 N/m, extension 0.12 m and mass 0.020 kg. Using energy conservation (½ k x^2 ? ½ m v^2) what is the maximum speed just after launch (m/s)?

A child does 35 J of work pushing a walker 2.8 m. What horizontal force did the child apply (N)?

Two identical bungee cords, each with spring constant 735 N/m and each extended by 8.0 m, store energy which lifts a 240 kg pod. What maximum height (m) will the pod reach? (g = 9.8 N/kg)

Which method transfers energy without needing particles to move (can travel through a vacuum)?

Which energy store increases as a rubber band or bungee cord is stretched?

Which equation gives gravitational potential energy (?E) in terms of mass m, gravitational field strength g and change in height h?

When a moving car brakes, which energy store increases in the brakes?