Bernoulli's Equation Example Problems, Fluid Mechanics - Physics

This physics video tutorial provides a basic introduction into Bernoulli's equation. It explains the basic concepts of bernoulli's principle. The pressure is high when the velocity is low and the pressure is low when the fluid flow is high. Also as the height increases, the pressure decreases. This video contains plenty examples of calculating the flow speed and the water pressure in different sections of a circular pipe where the height, radius, and cross sectional area changes. This tutorial also explains how to derive the formula for Bernoulli's equation using kinetic energy, potential energy, and mechanical energy.
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@ 14:26 he said that p2=250000/98000 it's actually supposed to be 250000-98000. I'm pretty sure that's what he meant and just got his words jumbled up. Wanted to clarify in case someone got confused.

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I found that P decreasing because of an increase in v as the radious of the pipe gets smaller to be counterintuitive at first.

[@nlee1021]

In the 3rd problem, the arrows for the direction of flow were assumed at the beginning and never reexamined which causes some confusion. The water must be flowing uphill (from c to a) because the direction of flow is always from high pressure to low pressure.

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[@uwemasuquo]

Please Change in Pressure is always P2 - P1. Why is the reverse the case in derivation of the Bernoulli's equation? God bless you Sir for making physics simple.

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[@ICantSeeYourRepliesDickhead]

If velocity is constant throughout then cancel out the one part and if height is constant then cancel out pgh

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[@intan6409]

Thhnnkk uu... But why we have to divide with area and volume when derive the equation

[@Ashley-dh8oy]

If pressure is force over area, wouldn't that mean area and pressure are inversely proportional? So why would decreasing area also decrease area? Is that like a special relationship where the force overcomes that?

[@DystopicEdits]

Can someone explain how the height is calculated and why it does not change?

[@ibrahimkantar2402]

Isn't it confusing ? P=F\A right. So , when the area is decreased to 2 , doesn't Pressure need to be higher normally ?

[@johnnyedemagboado4742]

Please I have a question: The pressure required to prevent crude oil from entering a plug core of a finely divided reservoir solid rock is twice as great for a liquid of surface tension 50mN/m, which completely wets the solid, as it is for a liquid of surface Tension 70mN/m, which has a finite contact angle with the reservoir solid rock a)calculate the contact angle b)What is the importance of the contact angle calculated

[@johnnyedemagboado4742]

Please do help me solve it

[@Manuel-of7et]

why was "delta P" written as P1 - P2? I'm confused, isn't "change in" always final - initial(P2-P1)?

[@jacksonbauer5199]

For question 2, what is the distance between points A & B? Without the distance or the amount of time it takes to travel from A to B at 4 m/s, slope cannot be calculated. I am no expert on this topic, but it seems that a 10 meter increase in height over the span of 1 meter would yield a different result than a 10 meter increase in height over 10 Kilometers. Am I wrong? Did I miss something?

[@ZULFERISYAHPUTRA]

Dear Sir............Example Problem : One hydraulic cylinder, the end is connected to the Threaded rod so that it can be rotated. Cylinders with a bore size of 18 mm, 10 mm rod and a stroke of 300 mm single acting in a condition that is filled with oil. If the cylinder is rotated 10 mm.
a. How to calculate it
b. What is the gauge pressure

[@ok-vv5vo]

at 26:00, Instead of taking the value of A and C I instead took from B and C and got the same answer. I did (496000) + 1/2 (1000)(10)^2 = P2 + 1/2 (1000)(5)^2 .. Is this a coincidence or just another way to solve for the same problem?

[@alisattarzade5424]

Could you please answer a question for a 3 example.How water flow point P2 to P3? because from calculations we got p3>p2 and we know fluid flow from high pressure to low pressure but in this example at exactly from point 2 to point 3 fluid flow low pressure to high pressure. How it can be possible?

[@salmaibrahim5206]

I hope you answer me. How the height of the pipe does not change?

[@LivingLarrystyle]

How come for question 3, we assume that the velocity btw a and b will be the same with the same area, however later on it was mentioned that with a high drop there is an increase in pressure which would lead to and decrease in velocity? Shouldn’t the velocity at B decrease?

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[@AhmadTalkss]

at 14:34, why cant u use the pressure head, h = p/lambda p = (10)(9800)

[@ajoboemmanuel3918]

U said if height is getting higher then pressure is getting lower that means the velocity is getting higher.
If that the case the velocity of water going up the storey building should be getting higher right?

[@crisdebo]

I think you made a mistake at 14:10, you changed the pressure in the left from 250000 to 150000, as well as saying dividing instead of subtracting.

[@leenbaitalmal1583]

the height wasnt converted into m, it should have been 0.1 rather than 10. Also I think he just wrote 250 000 except it wasn't clear