A Each time he does one pushup, Jose, who has a mass of 89kg, raises his center of mass by 25 cm. He completes an impressive set of 150 pushups in 5 minutes, exercising at a steady rate If we assume that lowering his body has no energetic cost, what is his metabolic power during this workout? Express your answer with the appropriate units. Part B In fact, it costs Jose a certain amount of energy to lower his body-about half of what it costs to raise it. If you include this in your calculation, what is his metabolic power?

Question

Physics

Julius

27 January, 18:29

A Each time he does one pushup, Jose, who has a mass of 89kg, raises his center of mass by 25 cm. He completes an impressive set of 150 pushups in 5 minutes, exercising at a steady rate If we assume that lowering his body has no energetic cost, what is his metabolic power during this workout? Express your answer with the appropriate units. Part B In fact, it costs Jose a certain amount of energy to lower his body-about half of what it costs to raise it. If you include this in your calculation, what is his metabolic power?

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Answers (1)

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Jeremiah May · Answer 1

The Metabolic power, If we assume that lowering his body has no energetic cost is 667 J/min

The Metabolic power, If lowering of his body needs half of the energy is 1000J/min

Explanation:

1. If we assume that lowering his body has no energetic cost:

Metabolic energy in 5 minutes

= Increase in potential energy for 150 pushups

= (89 kg) * (25/100 m) * 150

= 3337.5 J

Metabolic power

= (3375.5 J) / (5 min)

= 667 J/min

The Metabolic power, If we assume that lowering his body has no energetic cost is 667 J/min

2. If lowering of his body needs half of the energy what it costs to raise it.

Metabolic power

= (667 J/min) * [1 + (1/2) ]

= 1000 J/min

The Metabolic power, If lowering of his body needs half of the energy is 1000J/min