course Phy 232
Assignment 7Ch. 14 Problems 77, 80, and 85
77.
A. Apply Newton’s second law to volume element to show dp=pw^2rdr
I suspect you'll need to distinguish between p for pressure and rho for density
I have no idea where to start with this problem
80.
A. At what distance R from the foot of the wall does the emerging stream strike the floor?
Finding the Speed will end up give you T…
Po + 1/2pv1^2 +pgy1= P+pgy2
V1= sqrt (2(P-Po)/p)+ 2gh
right equation, but 2 g h wasn't in the equation so it's not clear how it ended up in the solution to the equation; in any case that term is part of what you would take the square root of when you solve for v; it won't appear outside the radical.
B. How far above the bottom of the Tank could a second hole be cut so that the stream emerging from it could have the same range as for the first hole?
85.
1. Fluid exits pipe E at atomospheric pressure. Bernoilli’s equation tells us the fluid velocity as water exits E which is 0.5rho Vexit^2 = rhogH1.
2. Point 1 is the narrow tube, Point 2 is the top of the fluid in the lower tube, and Point 3 is the level of fluid surface in the lower container.
3. At point 2 the fluid velocity is 0 which makes there be no net rho g h to Bernoulli’s equation because there is no fluid.
There is a different h when comparing points 2 and 3. Making P2 + rho g H2 = P3 + rho g H3. Which will make rho g (H3-H2) = rho g hi and h3-h2.
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I've inserted a couple of notes.
Please insert a few more lines to clarify what all the given quantities mean in terms of the situation, and their units. Also be sure the goal of every problem is either obvious from your work, or is clearly stated. If you don't understand how to solve a problem, at least discuss what you do and do not understand about the problem and the given information.