Reference no: EM132535753

A glass thermometer has a mass of 38 g and reads 18°C. It is then fully immersed in 140 g of hot water and allowed to come to thermal equilibrium. Its temperature now reads 38°C.

(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 39.1°C or 312.1 K. Assume that the specific heat of water is 4186 J/kg/K.