A piece of copper, of mass 120g is heated in a enclosure to a temperature of 125°c. It's den taken out of the enclosure and held in air for half a minutes & dropped carefully into a copper calorimeter of mass 100g containing 20g of H20 at 20°c. The temperature of the water rising to 25°c. calculate the rate at which heat is being 100t 46m the piece of cu, won it's held in air (side of H2o =4200 Jkg-1k-1, STC of cmu =4000 jkg-1k-1​