1. How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F?

2. How many Btu of heat are given off by 500 lb of aluminum when it cools from 650°F to 75°F?

3. How many kcal of heat must be added to 1250 kg of copper to raise its temperature from 25°C to 275°C?

4. How many joules of heat are absorbed by an electric freezer in lowering the temperature of 1850 g of water from 80.0°C to 10.0°C?

5. How many joules of heat are required to raise the temperature of 750 kg of water from 15.0°C to 75.0°C?

6. How many kilocalories of heat must be added to 750kg of steel to raise its temperature from 75°C to 300°C?

7. How many joules of heat are given off when 125 kg of steel cools from 1425°C to 82°C?