At 7:00am, the electricity supply swithes off and the temperature of the ceramic bricks starts to fall. The temperature of the bricks falls by 100°C over the next four hours. During this time, 9,000,000 J of energy are transferred from the bricks.

Calculate the total mass of the ceramic bricks inside the heater.

Specific heat capacity of the ceramic bricks = 750 J/kg °C

Please show clearly how you work out your answer.

Thanks.