An insulated container holds 500 grams of water at a temperature of 20∘C. An electric heater in the container inputs 24

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An insulated container holds 500 grams of water at a temperature
of 20∘C. An electric heater in the container inputs 2400
joules per second into the water. The heater is turned on for
20 seconds, then turned off. During these 20 seconds the
water is also stirred with a paddle that does 28000 J of
work. The specific heat capacity of water is 4.2 J/K/g.
a) deduce the change in internal energy of water in joules
b) what is the final temperature after 20 secs?