This is a homework exercise I got:
A renewable energy facility has to be built immediately under the Golden Gate Bridge. Estimate the time-averaged power that can, at the resource level, be generated by such a facility. The answer needs to be expressed in GigaWatts.
I got till so far:
Potential energy content of the water in the basin at high tide = ½ × area × density × gravitational acceleration × tidal range squared
= 0.5 x (1280 x 27.4)m x 1000 kg/m^3 x 9.8 x 10^2
= 1.7185 x 10^(10) J
total energy potential per day = Energy for a single high tide × 2
= 3.437 x 10^(10) J
mean power generation potential = Energy generation potential / time in 1 day
= y J/ 86400 s = 397807.4 W = 0.0003978074 GW
Is this correct?