Question

It is 5.50km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10.0km/hr (which uses up energy at the rate of 700W ), or you could walk it leisurely at 3.00km/hr (which uses energy at 290W ).

A. Which choice would burn up more energy?
B. How much energy (in joules) would it burn?
C. Why is it that the more intense exercise actually burns up less energy than the less intense one?

Answer 1

Walking

1914000 J

Step-by-step explanation:

P = Power

Time is given by

`t=(Distance)/(Speed)`

Energy is given by

Running

`E=Pt\\\Rightarrow E=700* (5.5)/(10)* 3600\\\Rightarrow E=1386000\ J`

Walking

`E=Pt\\\Rightarrow E=290* (5.5)/(3)* 3600\\\Rightarrow E=1914000\ J`

It can be seen that the energy walking requires more energy

Because the time taken cycling is less the energy is less.