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Suppose you used a hot pot to convert a 150-g piece of ice that was initially

at 15˚C into liquid water at 50˚C.

a)  Represent this process in two complete energy system diagrams, one covering the interval from -15 °C to 0 °C liquid, and the second covering the interval from 0 °C liquid to 50 °C.

b)  Now represent the entire process in one complete energy system diagram covering the entire interval.

c)  If your hot pot has a power rating of 600 Watts, show how to find how long it will take to complete the process. (Make sure you are comfortable using standard units of energy, and that you understand the relation of power to energy.) 

 

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( a )
Temp CC )
solid only ( ICE )
Temp
Ice+ water
ICE
- 20 0
Heat ( KJ )
Heat ( KJ )
(b
50C
Temp
water
Temp
- 20 C
Heat ( KJ )
- 20 c
Heat
( <) Energy required to convert Ice in
= ( 150 X cice...

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