Question

Work of 1800 J is done by stirring a perfectly insulated beaker containing 75 g of water. (Specific Heat of water = 1 cal./g °C, 1 cal. = 4.186 J). What is the chhange in the internal energy of the system?

Answer 1

To find the change in the internal energy of the system, we can use the formula:

Change in internal energy = Work done + Heat transferred

In this case, the work done is given as 1800 J. Since the beaker is perfectly insulated, no heat is transferred to or from the surroundings. Therefore, the heat transferred is zero.

So, the change in internal energy of the system is equal to the work done, which is 1800 J.