A man pushes a 50N box across a level floor at a constant speed of 2.0m/s for 10s. Find the average power output by a man.
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To find the average power output by a man, we need to determine the amount of work done and the time taken to do the work.
The work done by the man can be calculated using the formula:
Work = Force x Distance
In this case, the force applied by the man is 50N, and the distance traveled is given by the speed multiplied by the time:
Distance = Speed x Time
So the work done by the man is:
Work = Force x Distance = 50N x (2.0m/s x 10s)
Work = 50N x 20m = 1000 Joules (J)
Now, we can calculate the average power using the formula:
Power = Work / Time
In this case, the work done is 1000 J, and the time taken is 10s. So the average power output by the man is:
Power = 1000J / 10s = 100 Watts (W)
Therefore, the average power output by the man is 100 Watts.