Hints:
b.1)
If you cannot solve this by
calculus, the area is:
A • L ,
p
where A is the amplitude of the wave and L is the
wavelength.
b.2) Calculate the volume of this 1 m wide section, and use the
formula for kinetic energy:
m
• v2 ,
2
where v is the speed of the wave. Note that 1 m3
of water contains 1000 kg of water!