A4 A solar heater is installed on the roof of a house. At noon, it can heat up water from 20 C to 50 C when water flows through it at a rate of 2 kg/min. The specific heat capacity of water is 4200 J kg-1 C-1. (a) Find the energy absorbed by water in one minute in kJ. (b) Calculate the power of the solar heater. (4 marks) (3 marks) (c) How will the final temperature of the water change if the flow rate decreases? (1 mark)