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?
1 answer:
The <em>extra</em> energy needed by James in a week is 1950 joules.
Dimensionally speaking, the energy (
) , in joules, need by a person while doing an activity is defined by the following expression:
(1)
Where:
- Mass, in kilograms.
- Time, in hours.
- Energy index, in joules per kilogram-hour.
The <em>extra</em> energy needed by James is the sum of the energy spent both by running and walking:


The <em>extra</em> energy needed by James in a week is 1950 joules.
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