If a person lifts a 10 kg object to a height of 5 m in 5 seconds, what is the po

Practice Questions

Q1
If a person lifts a 10 kg object to a height of 5 m in 5 seconds, what is the power exerted?
  1. 100 W
  2. 200 W
  3. 300 W
  4. 400 W

Questions & Step-by-Step Solutions

If a person lifts a 10 kg object to a height of 5 m in 5 seconds, what is the power exerted?
  • Step 1: Identify the mass of the object. In this case, it is 10 kg.
  • Step 2: Identify the height to which the object is lifted. Here, it is 5 m.
  • Step 3: Use the formula for gravitational force, which is approximately 9.8 m/s².
  • Step 4: Calculate the work done using the formula W = mgh. Plug in the values: W = 10 kg * 9.8 m/s² * 5 m.
  • Step 5: Perform the multiplication: 10 * 9.8 * 5 = 490 J. So, the work done is 490 Joules.
  • Step 6: Identify the time taken to lift the object, which is 5 seconds.
  • Step 7: Use the formula for power, which is P = W/t. Plug in the values: P = 490 J / 5 s.
  • Step 8: Perform the division: 490 / 5 = 98 W. So, the power exerted is 98 Watts.
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