What is the mass flow rate of the water?

AI Thread Summary
The discussion revolves around a student seeking clarification on physics homework related to mass flow rate and fluid dynamics. The student expresses frustration with their current textbook's explanations and is looking for recommendations on alternative textbooks that cover similar problems. Participants suggest that instead of searching for the source of the problems, the student should attempt to solve them independently to enhance understanding. They also recommend visiting a university library for better resources or considering a Schaums outline for additional help. The conversation emphasizes the importance of engaging with the material directly rather than relying solely on external sources.
UCLA_preMD
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Hello,

I have some physics homework and I'm not looking for the answers. Rather, the textbook I currently use does not seem to be doing a good job (in my opinion) in explaining the topics. If anyone has seen some of these questions before and know what textbook they are used in, please let me know so by reading that one I may be able to understand the topics a little better (with respect to the problems). I have the answers as the solutions are available, but without any explanation. Here are some of the assigned homework problems:

Water is flowing at a speed of 0.5m/s through a 4cm diameter hose. The hose is horizontal. What is the mass flow rate of the water? At what speed does the water pass through a nozzle whose effective diameter is 0.6cm? what must be the absolute pressure of the water entering the hose if the pressure at the nozzle is atmospheric pressure

Water flows at a rate of 30mL/s through an opening at the bottom of a large tank in which the water is 4m deep. Calculate the rate of escape of the water if an added pressure of 50kPa is applied to the top of the water.

Water is moving with a speed of 8m/s through a pipe of 4cm in diameter. The water gradually descends 15m as the pipe diameter increases to 6cm. what is the speed of the flow at the lower level? If the pressure at the upper level is 200,000 Pa, what is the pressure at the lower level?

Thanks for any help.
 
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Well, here is how it works.

First use the homework help format.
Second show us your attempt to solve the problems
Third someone here will probably help you out once you make an attempt on your own.

Thanks
Matt
 


CFDFEAGURU said:
Well, here is how it works.

First use the homework help format.
Second show us your attempt to solve the problems
Third someone here will probably help you out once you make an attempt on your own.

Thanks
Matt

I get that, but instead of asking about every problem I have trouble on, I'm just trying to find the book which assigns these problems since the layout of it might be better in order to solve the problems I'm assigned.
 


Let me get this right.

...I'm just trying to find the book which assigns these problems...

So you have some random problems from a fluids class and you want to know what book they are from. Correct?

Uhh, wouldn't it be easier to just solve them?

If your book isn't doing a good job, then head to the local university library and read some of the fluid texts there or just purchase a cheap Schaums outline.

https://www.amazon.com/dp/0071487816/?tag=pfamazon01-20

Trying to find the book the problems came from seems like a big waste of time to me.

Thanks
Matt
 
Last edited by a moderator:
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TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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