Posted by Dan on Monday, December 6, 2010 at 5:47pm.
Equations you will need:
Q = mc deltaT
e = 1 - (Qc/Qh)
The first thing you need to realize is that when you're calculating Q it's Qc, because that is the heat going into the water and therefore out of the power station. So then you can plug that into e = 1- (Qc/Qh) and solve for Qh.
That isn't the answer yet, though, because it isn't asking how much heat the engine uses (input heat is Qh). It's asking how much total energy it can produce.
And now it's very simple because you know Qh, the total heat it uses, and you know the efficiency, the amount of that heat that can be used to do work. So you multiply Qh by the efficiency and THAT's the answer.
Related Questions
phys - A town is planning on using the water flowing through a river at a rate ...
Physics - A nuclear power plant has an electrical power output of 1200 MW and ...
Physics - A nuclear power plant has an electrical power output of 1200 MW and ...
Physics - A nuclear power plant has an electrical power output of 1200 MW and ...
PHYSICS NEED HELP FAST - A power plant has a power output of 1055 MW and ...
Science - Alex threw a stick in a river and watched as the river carried it away...
physics - can you help me through this? A boat moves through a river at 7.0 m/s ...
physics - A boat moves through the water of a river at 5 m/s relative to the ...
Integrals/Related Rates(?)/Volume - Fluid is flowing in a tube that has a radius...
Engineering/Chemistry - Milk is flowing through a heat exchanger at a rate of ...
For Further Reading
