Question

Look at the table for energy used in activities. James goes walking for 1.5 hours a week and running for 0.5 hours. James has a mass of 65kg. How much extra energy will he need a week in order to go running and walking?

Answer 1

The extra energy needed by James in a week is 1950 joules.

Dimensionally speaking, the energy ($E$) , in joules, need by a person while doing an activity is defined by the following expression:

$E = m\cdot t\cdot c$ (1)

Where:

• $m$ - Mass, in kilograms.
• $t$ - Time, in hours.
• $c$ - Energy index, in joules per kilogram-hour.

The extra energy needed by James is the sum of the energy spent both by running and walking:

$E = 65\,kg \times \left(1.5\,h \times 10\,\frac{J}{kg\cdot h} + 0.5\,h \times 30\,\frac{J}{kg\cdot h} \right)$

$E = 1950\,J$

The extra energy needed by James in a week is 1950 joules.

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