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mrs_skeptik [129]
3 years ago
9

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?
Physics
1 answer:
k0ka [10]3 years ago
5 0

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

<u>Explanation:</u>

<u>1.If we assume that lowering his body has no energetic cost:</u>

<u>Metabolic energy in 5 minutes</u>

        = Increase in potential energy for 150 pushups

        = (89 kg) × (25/100 m) × 150

        = 3337.5 J

<u>Metabolic power</u>

        = (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

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

<u>Metabolic power</u>

         = (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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Answer:

0.2286  m,  0.686 m and  1,143 m

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Explanation:

Destructive interference to the two speakers is described by the expression

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let's locate the origin on the left speaker

let's find the wavelength with the equation

        v =  λ f

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we substitute

      Δr = (2n + 1) v / 2f

let's calculate for difference values ​​of n

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we locate the different values ​​for a minimum of interim

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     0    0.2286

     1     0.686

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therefore we see that there is respect even where the intensity is minimal

6 0
2 years ago
What is the sprinters output at 2.0 s, 4.0 s and 6.0 s?
kari74 [83]

A 59 kg sprinter, starting from rest, runs 47 m in 7.0 s at constant acceleration.?  

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Because the acceleration is constant, the force will be constant as well  

F = ma  

P = mav  

for constant acceleration, the velocity at each time is found using  

v = at  

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find the acceleration using kinematic equation  

s = ½at²  

a = 2s/t²  

a = 2(47) / 7.0²  

a = 1.918 m/s²  

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P(4.0) = 59(1.918²)4.0 = 868.51 W = 0.87 kW  

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I hope this helped.  


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