Mount Snowdon in North Wales is high

PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy

Problem

Mount Snowdon in North Wales is

1085\,\text{m}

high. A popular way of reaching the summit is to walk along the Pyg Track, which is about

5\,\text{km}

long and takes a typical climber about

5\,\text{h}

to complete. If a chocolate bar contains

1.1\,\text{MJ}

of chemical energy and the human body is

25\%

efficient: (a) Calculate how many chocolate bars a typical climber of mass

75\,\text{kg}

would have to eat in order to be able to climb Mount Snowdon.

(g=10\,\text{N kg}^{-1})

(b) Suggest why, in practice, it might require more than this. (c) Calculate the average power that a typical climber must develop during the ascent.