Question

the temperature of a 150 g drinking glass decreased from 25 degrees Celsius to 14 degrees Celsius as 200 grams of water were added. Determine the original temperature of the water. (Hint: heat loss must equal heat gain)

Answer 1

Heat lost or gained by a body is given by H=ms\(\Delta\theta\)
where, m is mass of body
s is specific heat capacity
\(\Delta\theta\) is change i temperature

Here heat is lost by glass and gained by water
Find heat lost by glass and heat gained by water by using above relation and equalize them. the final temperature of water is 14 degrees. suppose initial temperature to be x. and do the calculations and find x. That will be your answer.