1) How much heat is required to convert 205g of Ice at -4 degrees C to water at

Question

1) How much heat is required to convert 205g of Ice at -4 degrees C to water at 4 degrees C?

2) A steel railroad is 24.4m long, How much does it expand during a day when the low temp is 18 degrees C and the high temp is 35 degrees C?

3) An engineer has designed a machine to produce electricity by using the difference in the temperature of ocean water at different depths. If the surface temp is 25 degrees C and the temp at 50m below the surface is 11 degrees C, what is the maximum efficiency of this machine?

Explanation / Answer

The change in length of the steel rod is (DeltaL) =Lalpha*DeltaT

=24.4*13*10-6*(35-18)

=5392.4*10-6m

=0.00539m

or 0.54cm

3.

The maximum efficiency of the machine is nmax =25-11/298 =0.0469*100 =4.69%

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