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____
• v ^{2}__

2

where v is the speed of the wave. Note that 1 m^{3}_{
}of water contains 1000 kg of water!_{}