A student of mass 52 kg climbs a staircase 5 m high in 9 s…

Contributed by StemPy Lab

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

A student of mass $52\ \text{kg}$ climbs a staircase $5\ \text{m}$ high in $9\ \text{s}$ . What is the student's power? ( $g = 9.8\ \text{m/s}^2$ )

Need a reminder? The key ideaShow

Power $P = \dfrac{W}{t}$ , in watts: $1\ \text{W} = 1\ \text{J/s}$ . The energy used is $P \times t$ , with $t$ in seconds.

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

← All Problems

← Machine A does 7200 J of work in 15 s. Machine B does 10 400 J of work in 26 s…A motor of power 900 W runs for 3.5 minutes. How much work does it do? →

More onMechanics › Work, Energy and Power

Discussion (0)

Loading…

A student of mass 52 kg climbs a staircase 5 m high in 9 s…

The worked solution

Discussion (0)

Want to go further in Mechanics › Work, Energy and Power?