Question

the power output of an engine is 3 kW. how much work does the engine do in 20 second

Answer 1

Power output of an engine = 3kW = 3000W
Time taken = 20 seconds
Energy consumed = work done
Let work done be W.
Power = Work done/ Time taken
3000 = W/20
3000 x 20 = W
W = 60000 J

Hence Work done = 60000 J = 60 kJ.

Answer 2

The engine does 60000 joules of work in 20 seconds.

To calculate the work done by an engine, we can use the formula:

work = power x time

In this case, we know that the power output of the engine is 3 kW (kilowatts) and the time is 20 seconds.

So, we can plug in these values into the formula:

work = 3 kW x 20 seconds

To get the work done in Joules we need to convert kW to W (watts)

1 kW = 1000 W

so,

work = 3000 W x 20 seconds = 60000 J (joules)

Therefore, the engine does 60000 joules of work in 20 seconds.

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