Hi there,

Ok now this problem is

A piston in a large factory engine moves up and down in a cylinder. The height H centimetres of the piston at T seconds is given by the formula H=120sin pi T + 200

A)State the aplitude and period?

B)what are the maximum and minimum height of the piston ?

C)how many complete cycles does the piston make in 30mins?

The volume of air in the lungs can be modelled by a sinusoidal wave.

A) The volume of air in the lungs varies from 1000ML to 5000ML over a period of 6s. Determine an equation for the volume of air over time.

B)Use the equation to determine the amount of air in the lungs at

i)1.5s

ii)4.6s

I answered all my other questions and these questions seems to be giving me grief haha(Tmi)