Question

Assume running consumes 109 cal per mile. If you run nine minute miles, what is your average power output, in watts?

Answer 1

If one runs nine miles, one will consume 9*109=981 calories per minute

We need to transform that into Watts (Joules per second), as shown below.

`\begin{gathered} 1\text{calorie}=4.184\text{Joules} \\ 1\text{ minute=60seconds} \end{gathered}`

Therefore,

`981\frac{\text{cal}}{\min}=(981\cdot4.184)/(60)(J)/(s)=68.4084W`

The answer is 68.4084Watts