What is the power used by Kim when he pushes horizontally on a block with a force of 800N, moving it through a distance of 5.0 m across a level floor in a time of 20s?
Kim's power can be calculated using the formula: Power = Work Done / Time. The work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force. Therefore, we can substitute the given values into the formula to find Kim's power.
Step 1:
a) Given values:
- Force = 800N
- Distance = 5.0m
- Time = 20s
b) Substituting into the formula:
Power = (Force * distance) / time
Power = (800N * 5.0m) / 20s
Power = 200 Watts
Therefore, the power used by Kim is 200W.
Calculation of Kim's Power:
Power = Work Done / Time
Power is the amount of energy transferred or converted per unit time. Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force. Therefore, the formula for power can be derived as:
Power = (Force * Distance) / Time
By substituting the given values (Force = 800N, Distance = 5.0m, Time = 20s) into the formula, we can calculate Kim's power:
Power = (800N * 5.0m) / 20s = 200 Watts
Therefore, Kim uses 200W of power when pushing the block horizontally with a force of 800N across a distance of 5.0m in 20s.