(Power generation) One major source of electricity is hydroelectric generation, in which flowing water is redirected to turn a turbine generator. The power generated by this water flow is given by this formula: P-px x H xg Pis the power generated by the water flow (watts - J/s = kg-m/s2-1/s). p is the water density (kg/m3) O is the volume flow rate (m3/s). g is the acceleration caused by gravity (9.81 m/s2). H is the distance (in m) water falls on its way to the generator, known as the head. a. Using this formula, write a C++ function named powerGen() that accepts two double- precision arguments (one for the head distance and one for the water flow) and returns the power generated in watts. b. Include the function written for Exercise 7a in a working program, and verify that your program is working correctly by determining the watts generated by a head of 14 meters of water flowing at 20 m3/s. After verifying that your program is working correctly, use it to determine the watts generated by a head of 30 meters of water flowing at 20 m3/s