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7 September, 22:54

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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  1. 7 September, 23:18
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    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
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