A generator at Hoover Dam can supply 396 MW of electrical power. Assume that the turbine and the generator are 83.1% effi- cient. Find the rate with which falling water must supply energy to the turbine. The accelera- tion due to gravity is 9.8 m/s2 . Answer 476.53 Part 2 If the water falls 21.3 m, what is the mass of the water that must pass through the turbine each second to supply this power? Answer in units of kg/s