Answer:
0.066 cent
Explanation:
Efficiency (E) = Energy output (Eo)/Energy input (Ei)
Eo = E × Ei
E = 0.6
Ei = mass × acceleration due to gravity × height
mass = 100lbm = 100×0.45359kg = 45.359kg, height = 300ft = 300/3.2808 = 91.44m
Ei = 45.359×9.8×91.44 = 40646.7Ws = 40.6467kWs = 40.6467kWs × 1h/3600s = 0.011kWh
Eo = 0.6 × 0.011kWh = 0.0066kWh
1kWh = 10 cents
0.0066kWh = 0.0066×10 = 0.066 cent
