- Homework Statement:
Consider a liquid exerting a force on a plunger. Find that force
I saw somewhere that I don't remember anymore that you can use medium force, specifically medium pressure:
(P up + P down) / 2
I also saw the following expression:
dF = (P + ugh) dS that represents the force exerted by each minuscule piece.
I was wondering if those two expressions are right and how can I start from the second and get to the first. In short, I wanted to better understand the concept of average quantities. In speed for example, I can use ( Vinitial+ Vfinal) / 2 to find the average speed, that is, when I can do a simple arithmetic medium.
- Relevant Equations:
- P2 = P1 + ugh , u = Especific mass.