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

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**1. How much work would it take to heat 100kg 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 10kg 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.