2. A microwave rated at 1.0 x 105 W is used to heat water with mass 0.50 kg from 15C to 55.C. The specific heat capacity of water is 4184 Jkg-1. C-1. (a) (2 points) Determine the amount of energy required to heat up the water. (b) (3 points) If the microwave is 46% efficient, determine the amount of time need to heat up the water