How do waves behave differently to Earth's interior as they encounter the boundaries of different mediums?
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One of the concepts to be used to solve this problem is that of thermal efficiency, that is, that coefficient or dimensionless ratio calculated as the ratio of the energy produced and the energy supplied to the machine.
From the temperature the value is given as
Where,
T_L = Cold focus temperature
T_H = Hot spot temperature
Our values are given as,
T_L = 20\° C = (20+273) K = 293 K
T_H = 440\° C = (440+273) K = 713 K
Replacing we have,
Therefore the maximum possible efficiency the car can have is 58.9%
There are two different processes here:
1) we must add heat in order to bring the temperature of the water from
to 
(the temperature at which the water evaporates)
2) other heat must be added to make the water evaporates
1) The heat needed for process 1) is
where
is the water mass
is the water specific heat
is the variation of temperature of the water
If we plug the numbers into the equation, we find
2) The heat needed for process 2) is
where
is the water mass
is the latent heat of evaporation of water
If we plug the numbers into the equation, we find
So, the total heat needed for the whole process is
1) we must add heat in order to bring the temperature of the water from
2) other heat must be added to make the water evaporates
1) The heat needed for process 1) is
where
If we plug the numbers into the equation, we find
2) The heat needed for process 2) is
where
If we plug the numbers into the equation, we find
So, the total heat needed for the whole process is