Question

A 100 W engine generates 1000 J of energy. How long did it run for?

A. 1 s
B. 10 s
C. 5 s
D. 100 s

Answer 1

B. 10 s

Step-by-step explanation:

Given the following data;

Power = 100 Watts

Energy = 1000 Joules

To find the time;

Power can be defined as the energy required to do work per unit time.

Mathematically, it is given by the formula;

`Power = \frac {Energy}{time}`

Making time the subject of formula, we have;

`Time = \frac {Energy}{Power}`

Substituting into the formula, we have;

`Time = \frac {1000}{100}`

Time = 10 seconds