An electric winch on a construction site is used to lift a package of building materials. The electric motor that drives the winch is powered by rechargeable batteries.
State the form of the energy stored in the batteries.
The winch raises a package of mass 45 kg through a vertical distance of 6.0 m in 8.0 s. Take the acceleration of free fall g=10 m/s2g = 10\text{ m/s}^2g=10 m/s2.
Calculate the gravitational potential energy gained by the package.
The efficiency of the winch mechanism is 0.75 (75%). Calculate the input power to the winch mechanism.
The batteries are recharged from a mains voltage supply that is generated in a coal-fired power station. By comparison with a solar farm, state one advantage and one disadvantage of running a power station using coal.
advantage:
disadvantage:
229 exam-style questions on CIE IGCSE Physics 1.7.1a Energy stores and energy transfers. Each one has a worked solution and a mark scheme showing where the marks go.