A-level Physics (Advancing Physics)/Specific Heat Capacity/Worked Solutions

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1. How much work would it take to heat 100 kg of liquid water from 20 °C to 36.8 °C?

2. How much work would it take to heat a well-insulated room from 15 °C to 21 °C, if the room is a cube with side length 10m, and the density of the air is 1.2kgm−3?

3. A 10 kg block of iron at 80 °C is placed in the room above once it has reached 21 °C. If the iron cools by 40 °C, what is the new temperature of the room?

Energy must be conserved, so:

°C

So, the new temperature of the room is 21.149 °C.