According to a simplified model of a mammalian heart, at each pulse approximately 20 g of blood is accelerated from 0.20 m/s to 0.32 m/s during a period of 0.08 s . what is the magnitude of the force exerted by the heart muscle?

    Magnitude of the force exerted by the heart muscle  = 0.03 N

Explanation:

  We have force = mass * acceleration

   Acceleration = Rate of change of velocity = Change in velocity/time = (0.32-0.20)/0.08

                          = 0.12/0.08 = 12/8 = 1.5

   Mass of blood = 20 g = 20/1000 kg = 0.02 kg

   Magnitude of the force exerted by heart muscle = 0.02*1.5 = 0.03 N

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