A cup of boiling water (100 degrees C) (0.2kg) transfers 20 000J of heat to its surrounding in 1 hour. What temperature is the water in the kettle after 1 hour?
To answer this we need to use the equation Q = MC(T1-T2)
We want to know what T2 is (ie the temperature after one hour).
So rearrange the equation to get T2 = T1 - Q/MC
No substitute the values given: T2 = 100 - 20000/(0.2 x 4200) = 76.2 0C
CJ
Related Physics GCSE answers
All answers ▸Describe how the control rods in a nuclear reactor are used to regulate nuclear fission in a nuclear reactor.
Describe how making a saucepan black and adding fins will help heat food up faster
If Newton's 3rd law is true (all actions have an equal and opposite reaction), then how can any object move?
How to i calculate total resistance in a circuit?