FE Fluid Mechanics Review Session 2022

FE Exam Review Session: Fluid Mechanics
Problem sheets are posted below. Take a look at the problems and see if you can solve them ahead of time. See the video for solutions. Feel free to ask questions!

This is a question based review with questions that will cover topics that address each topic in the NCEES FE Civil exam specification.
These topics include:
A. Flow measurement
B. Fluid properties
C. Fluid statics
D. Energy, impulse, and momentum of fluids

[TrucNguyen-xkud]

Thank you Mark for all of your videos! I just passed my FE exam after several failed attempts. This time I studied with you and passed it. Your videos are incredible, I appreciate how you put them together like this.

[ThatWasNew]

Thanks Mark for your help incredible, I have passed FE

[shamanaveedu]

In question# 8 specific gravity SG =γ/γw we can directly solve this.SG*γw=γ
put value 13.6*9810=γ

[arslankhalid]

Thanks Mark, I have a quick workaround for problem #10, instead of calculating slant distance for "Yc" and "Ycp" we can directly calculate the vertical distances "hc" and "hcp". Hc will be 50cm, however little caution needs to be taken when calculating "Ixc" and Area "A" of the gate, instead of using 16cm, use 8cm as a vertical dimension of the gate to calculate "Ixc" and "A". Just wanted to put this method as a comment as it reduces time to calculate vertical distance to the centre of pressure.

[kautz]

For the Pitot tube question you could also do v=sqrt(2gh) and get the same velocity without finding what the pressures are.

[curtisreidy]

Mark, just wanted to say a quick thank you for putting these videos together. I watched them a few days prior to my exam and I am happy to say I passed. THANK YOU!

[mateusbernardodeoliveira]

To find velocity on Question #3, a faster route, although it does not explain all the concepts you did while solving, is to equate the difference in height between the two tubes to (V^2)/2g, and then solve for V.

edit: Mark did explain it right after solving the first way.

[Cdwilliams]

Thank you Mark! Thanks to your helpful videos I was able to pass the FE on my third attempt!
P.s. Your jokes are the best!

[hulb]

Thanks Mark. I am using this to study for the PE and it has been very helpful.

[jossyurael]

question No.6 needs to be corrected. We should assume that the Vat is closed. otherwise, the atmospheric pressure will be added.

[nadheeralgburi]

First question 1.3
Should be 1.025 not 1.25

[amanuelzemedhun]

Hello Mark! Thank you for these videos! In question 11, why did you make P2 zero? Why not plug in the atmospheric pressure itself?

[DatNguyen-wifs]

Incredible as always Mark. Appreciate the video

[Fleur]

Hi Mark, thank you for the FE review sessions! I find them extremely valuable! For Fluid Mechanics Problem 10, can you go over how you calculated Ixc ?

[nabinshrestha]

Hi Mark, In question number 7, why Pvinegar=5386N/m^2?

[jace]

for question 11 why did you use 0kpa for Pb instead of using 101.3 kpa for atm pressure?

[danielj.berrios]

Question 12: the problem ask for the horizontal Thrust force ( forces acting in the X axis ) why is it that the answer is 2, 828 Lb acting vertically ?

[danielj.berrios]

Question 5: W= γ*V, But the problems states that the density ρ=45 lb/ft3. why are you using density as Specific weight γ ?? Thanks Matt. Keep the jokes up man!

[tundratales]

Hi Mark, Thank you for the lecture. On question 5, you multiplied the height of the raft (7.5"/12") by 6' by 8' feet to get the volume of wood in the raft, but since the raft is made of 7.5x7.5 timbers, there has to be some space between the timbers since 7.5 inches does not evenly divide into 6 feet. Only 9 of these timbers can fit into a 6 foot span, unless of course you are using a partial timber (0.6 the width of the others), which kind of defeats the purpose of telling the width dimension of the timbers, right?

[MarkMattsonPE]

So how do you spell gage/gauge? USGS and the Steel Deck Institute uses gage. However, ASTM and others use gauge. I normally associate gage with stream flow gages and steel deck, and gauge with meters used to measure a pressure. Merriam-Webster indicates gauge is preferred. Both are in the FE Reference Handbook. Thoughts?