What is the Average Power Output of a Human Heart Pump?

AI Thread Summary
The discussion focuses on calculating the average power output of the human heart based on the amount of blood pumped and its acceleration during a heartbeat. It notes that 20g of blood is accelerated from 0.20 m/s to 0.34 m/s at a rate of 70 beats per minute. A participant calculates the kinetic energy as 0.196 but expresses uncertainty about its correctness and relevance to the heart's power output. There is a request for clarification on how to relate kinetic energy to the heart's power and the need for proper unit specification. The conversation emphasizes the importance of clear calculations and understanding the relationship between energy and power in this context.
Annika
Messages
2
Reaction score
0

Homework Statement



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.

Homework Equations


KE=1/2mv2

The Attempt at a Solution


I worked out that the kentic energy is 0.196 but idk of that is correct [/B]
 
Physics news on Phys.org
The kinetic energy of what? How do you relate it to the power of the heart?
 
Orodruin said:
The kinetic energy of what? How do you relate it to the power of the heart?
I'm not sure I think it's the KE of the blood
 
Show how you calculate that, please

Oh, and: welcome to PF :)
 
If you are not sure of what you have computed, how are we going to be able to tell you whether it is correct or has anything to do with what you are seeking? Also, you have also given a number. Energy is a dimensional quantity and you need to specify a unit. The question that remains is: What are you computing, how are you doing it, and why do you think it is related to the solution?
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Calculate Avg Power Output for 75kg Person Walking 100ft in 3min
Replies
9
Views
2K
How to calculate average power?
Replies
1
Views
7K
Calculate the average amount of power that the heart delivers
Replies
4
Views
2K
How many crates can you load in a minute with different average power outputs?
Replies
1
Views
2K
Estimating Heart Power Output for Humans Standing/Lying Down
Replies
1
Views
3K
Calculating Pump Power and Fountain Height from Water Ejection Speed
Replies
20
Views
4K
How Much Work Does the Human Heart Perform in a Day?
Replies
1
Views
4K
Average Power Output for 260000 kg Jet at 9200m Altitude
Replies
3
Views
2K
Power output by basketball player when jumping
Replies
7
Views
3K
How Is the Average Power Output Calculated for an Airplane Propeller?
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top