Could use some help with question 3 Any help would be much a

Could use some help with question 3. Any help would be much appreciated. I have done the other questions but any feeback on those so i could check my answers would also be appreciated.

Solution

The pressure is depth based parameter. So there will be a significant changes when system is horizontal and wjen system is in inclined position. Since here 2° fall off given to the system thensystem has two compenents namely horizontal and vertical. Since horizontal dimension doesnot contribute to the pressure. Vertical compenet is responsible for pressure. So the height variation will be taken as

h=l*sin(theta). So pressure would be leas in the system then 100psig. Then by calculating height pressure can be found out