QUESTION - Two litres of room temperature water at 20C is added to one litre of boiling water. a. Would the total internal energy of the water samples change when they were mixed? Explain. b. Calculate the final temperature of the mixed water, neglecting the thermal properties of

QUESTION-

A glass thermometer has a mass of 38 g and reads 18C. It is then fully immersed in 140 g of hot water and allowed to come to thermal equilibrium. Its temperature now reads 38C. (a) Find the amount of energy Qg absorbed by the glass thermometer during this temperature increase. [Treat the thermometer as entirely made of glass with a specific heat cg= 840 J/kg/K.] (b) Assuming no energy is lost to the environment, use conservation of energy to write down a number for the energy lost by the water Qw. Then use the usual equation to show that the initial temperature of the water must have been about 39.1C or 312.1 K. Assume that the specific heat of water is 4186 J/kg/K. the water container.