The fireman can carry a lady stuck in a building down a 20m ladder in 20 seconds. He uses 160N of force. How much power was used?
Power is defined as the rate at which work is done or the rate at which energy is transferred. In this context, power can be calculated using the equation:
Power = Work / Time
We can calculate the work done by the fireman using the equation:
Work = Force × Distance
Given that the force used by the fireman is 160N and the distance covered is 20m, we have:
Work = 160N × 20m = 3200 Joules
Now, we can calculate the power using the equation mentioned earlier:
Power = Work / Time = 3200J / 20s = 160 Watts
Therefore, the power used by the fireman is 160 Watts.