Power and efficiency

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Question 14
Easy

Figure 1 shows a patient in a rehabilitation clinic using an elastic resistance band during an exercise.

Figure 1: A diagram of a person holding two ends of a flat, elastic resistance band, pulling their hands apart horizontally to stretch the band.

The spring constant of the resistance band is 80 N/m.

The patient does 36 J of work to stretch the band.

The patient takes 0.8 s to fully stretch the band.

Calculate the useful power output of the patient when stretching the resistance band.

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Power and efficiency Questions

  1. GCSE
  2. /Physics
  3. /Power and efficiency