A student seals 200g of ice−cold water in a glass vacuum (thermos) flask and finds that it warms up by 3.5 K in one hour SHC of water =2400 Jkg^(−1) K^(−1) a) Calculate the average rate of heat flow in the flask in watts. To check this result over a longer period,the student fills the flask with equal amounts of ice and water all at 0°C, and leaves it for 4 hours. the specific latent heat(enthalpy) of fusion of ice is 0.33MJg^(−1) b) How much ice would you expect to have melted at the end of the four hours?