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 ▸On a day with no wind, a large object is dropped from a tall building. The object experiences air resistance during its fall to the ground. State and explain, in terms of the forces acting, how the acceleration of the object varies during its fall.
Why doesn't the magnetic force change the velocity of a particle?
What is meant by terminal velocity?
If a car sets off from rest with a constant acceleration of 3 m/(s^2), what would its speed be after 5 seconds?