Physics – 1.7.4 Power | e-Consult
1.7.4 Power (1 questions)
Login to see all questions.
Click on a question to view the answer
Given:
- Mass (m) = 5 kg
- Height (h) = 1 m
- Time (t) = 2 s
Calculate the potential energy gained by the weight:
Potential Energy (PE) = mgh = 5 kg * 9.8 m/s² * 1 m = 49 J
Calculate the work done by the student:
Work done (W) = Force (F) * Distance (d)
The force required to lift the weight is equal to the weight of the object: F = mg = 5 kg * 9.8 m/s² = 49 N
Work done (W) = 49 N * 1 m = 49 J
Calculate the power output of the student:
Power (P) = Work done (W) / Time (t) = 49 J / 2 s = 24.5 W
Answer: The power output of the student is 24.5 W.