An athlete decides to measure their personal power rating by climbing a vertical ladder.
State the three physical quantities that must be measured in order to calculate the athlete's average power output during the climb, and name a suitable measuring instrument for each quantity.
One climber is measured as having a power output of 450 W450\text{ W}450 W. Their weight is 750 N750\text{ N}750 N.
They climb a vertical ladder whose rungs are spaced 20 cm20\text{ cm}20 cm apart.
How many rungs can they climb in 6 s6\text{ s}6 s?
The human body is only about 12%12\%12% efficient when climbing ladders.
Calculate the actual energy used by the climber's body when they climb 242424 rungs.
95 exam-style questions on CIE IGCSE Physics 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.