Determine the power of the engine, which performs work of 30 kJ in 10 minutes.

Given:

A = 30 kJ – work done by the engine;

t = 10 minutes – the time during which the engine performs work A.

It is required to determine the motor power N (Watt).

Let’s translate units of work in SI:

A = 30 kJ = 30 * 1000 = 30,000 Joules.

Let’s convert units of time in SI:

t = 10 minutes = 10 * 60 = 600 seconds.

Then the engine power will be equal to:

N = A / t = 30000/600 = 300/6 = 50 watts.

Answer: the engine power is 50 watts.