The extra energy needed by James in a week is 1950 joules.
Dimensionally speaking, the energy ([tex]E[/tex]) , in joules, need by a person while doing an activity is defined by the following expression:
[tex]E = m\cdot t\cdot c[/tex] (1)
Where:
- [tex]m[/tex] - Mass, in kilograms.
- [tex]t[/tex] - Time, in hours.
- [tex]c[/tex] - 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:
[tex]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)[/tex]
[tex]E = 1950\,J[/tex]
The extra energy needed by James in a week is 1950 joules.
We kindly invite to check this question on energy: https://brainly.com/question/8118460
