IB Physics-Qc#14-Topic4 and 8-Paper 2-Waves HL-Pumped storage (Hydroelectric power)

A buoy, floating in a vertical tube, generates energy from the movement of water waves on the surface of the sea. When the buoy moves up, a cable turns a generator on the sea bed producing power. When the buoy moves down, the cable is wound in by a mechanism in the generator and no power is produced.
The motion of the buoy can be assumed to be simple harmonic.
A wave of amplitude 4.3 m and wavelength 35 m, moves with a speed
of 3.4 m s .
b. Calculate the maximum vertical speed of the buoy.
c. Sketch a graph to show the variation with time of the generator output
power. Label the time axis with a suitable scale.
Water can be used in other ways to generate energy.
d. Outline, with reference to energy changes, the operation of a pumped
storage hydroelectric system.
e. The water in a particular pumped storage hydroelectric system falls a
vertical distance of 270 m to the turbines. Calculate the speed at which
water arrives at the turbines. Assume that there is no energy loss in the system.
f. The hydroelectric system has four 250 MW generators. Determine the
maximum time for which the hydroelectric system can maintain full
output when a mass of 1.5 x 10^10 kg of water passes through the turbines.
g. . Not all the stored energy can be retrieved because of energy losses in
the system. Explain two such losses.
topic 4 and 9 oscillations and waves playlist:

TOPIC 8

[bewu]

you solved it wrong lol, at least the b2 part