Two construction workers are lifting a bucket of wet cement from the ground to the third floor of a building using a rope and pulley. The bucket is raised at a steady pace and brought to rest at the third floor.
Which form of energy does the bucket of cement possess that is significantly greater at the third floor than when it is on the ground?
State the two measurements that must be made in order to calculate this increase in energy.
Which form of chemical energy in the worker's body is used to lift the bucket?
State the additional measurement needed, in addition to those in (a)(ii), in order to calculate the average useful power developed by the worker during this task.
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.