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Fluid Dynamics

During each heartbeat, approximately 70cm³ is pushed from the heart at an average pressure of 105mm-Hg. Calculate the power output of the heart, in watts, assuming 70 beats per minute.

*please explain this as simply as possible- thanks so much :)

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Volume of blood pumped in one heart beat = 70 cc = 70*10^-6 m^3
Volume of blood pumped in 70 heart ...