Heating and cooling

Try your hand at some physics problems based on heating and cooling set by St John’s Physics tutor Professor Tony Weidberg

Q: You want to heat a cold room using a simple electric bar heater. This consists of one conducting wire connected to the mains via a plug. In order to maximise the power, should you make the wire thinner or thicker?

Click here for the answer.

Q: Consider a glass of water with a block of ice floating on the surface. What happens to the level of the water when the ice melts?

Click here for the answer.

 

Teachers we want to hear from you too if you want to get involved and set some questions of your own – email inspire@sjc.ox.ac.uk.

 

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