## Homework 4A7

Jasmine 2C
Posts: 184
Joined: Wed Sep 18, 2019 12:18 am

### Homework 4A7

For part a of this problem:
(a) Calculate the heat that must be supplied to a copper kettle of mass 400.0 g containing 300.0 g of water to raise its tem- perature from 20.0 8C to the boiling point of water, 100.0 8C. (b) What percentage of the heat is used to raise the temperature of the water?
why do we need to add the heat needed to raise temp of copper kettle and the heat needed to raise temp of water?

Daniel Honeychurch1C
Posts: 109
Joined: Thu Jul 11, 2019 12:15 am

### Re: Homework 4A7

To heat the water you also need to heat the kettle so heat can be transferred to the water. When you heat water in a kettle, the kettle doesn't stay cold but requires heat to increase its temperature.

andrewcj 2C
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

### Re: Homework 4A7

When the question says "its", it is referring to the entire system, which includes the kettle and the water.

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