Physics homework helpWatch

#1
I'm stuck on this question:
during a human heart beat, 20g of blood are pushed into the main arteries. This blood is accelerated from a speed of 0.20ms-1 to 0.34ms-1. For a heart pulsing at 70 beats per minute, calculate the average power of the heart pump.
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4 years ago
#2
(Original post by Lemonpotato)
I'm stuck on this question:
during a human heart beat, 20g of blood are pushed into the main arteries. This blood is accelerated from a speed of 0.20ms-1 to 0.34ms-1. For a heart pulsing at 70 beats per minute, calculate the average power of the heart pump.
Welcome to TSR physics.
The power is the amount of work done per second.
1) How much blood (mass) is pumped per second.
2) What is the change in its kinetic energy. (KE from this mass of blood and velocity)
3) work done per second (power) direct from the answer to 2)

BTW
All the threads here are for physics homework help.
Make yours stand out a little!
4 years ago
#3
as Stonebridge said. make sure you are working with kg and seconds, not g and minutes
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