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# Thermal Physics - Physics AQA A level Unit 5 watch

1. Hey,

Question paper: http://filestore.aqa.org.uk/subjects...W-QP-JUN10.PDF

Question number: 1 (c)

Mark scheme: http://filestore.aqa.org.uk/subjects...W-MS-JUN10.PDF

Basically, my question is what is the theory behind the change in temperature of the lead being equal to original temperature - final temperature of iron

This always seems to be the case with these types of questions: when a substance is added to another, its change in temperature is always = original temperature of the susbtance - final temperature of other substance.

Why is this?

Thanks!
2. l m a o
3. (Original post by Nikhilm)

Basically, my question is what is the theory behind the change in temperature of the lead being equal to original temperature - final temperature of iron

This always seems to be the case with these types of questions: when a substance is added to another, its change in temperature is always = original temperature of the susbtance - final temperature of other substance.

Why is this?

Thanks!
The final temperature of both substances will be the same. Think about putting an ice cube on the table, it will melt and the water will be the same temperature as the wood. Two substances together will always end at the same final temperature.
4. (Original post by TheBride)
The final temperature of both substances will be the same. Think about putting an ice cube on the table, it will melt and the water will be the same temperature as the wood. Two substances together will always end at the same final temperature.
Yeah, thanks, I managed to figure it out

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