Fundamentals of Fluid Mechanics Questions and Answers  




Yes you are missing a term! Don't make an assumption and remove terms unless you have no other option. Keep your expression as complete as possible.




I'll give you an extension until Tuesday 11:00. The quiz will take place on Tuesday, not tomorrow.




You have the right answer: there was a typo and it is now fixed.




I am not sure why you think the pressure term should vanish. You should explain your reasoning.




The work due to pressure in the ground frame scales with the product between pressure and velocity of surface where pressure is applied (i.e. velocity of the surface with respect to the ground). If you expand $H$ in terms of $P$ in your equation and rewrite, you'll find that this is exactly the case. I see nothing wrong with the equation you posted.



$\pi$ 