Question

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?

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