# physics

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why does an ideal fluid move faster through a pipe with decreasing diameter?

a. the pressure within the fluid increases
b. the pressure within the fluid decreases
c. the pipe exerts more pressure on the fluid
d. the fluid moves downhill

• physics -

What is your thinking? You are dealing with the law of continuity.

Frankly, the wording on answers a and b are just plain lousy. So assume it means the pressure difference between the ends of the pipe is either increasing or decreasing.
What makes fluid flow faster?

• physics -

i'm looking in my book and i cant find exactly what i need...i'm guessing B?

• physics -

You guessed wrong. Answer the question: what make fluid flow faster?

• physics -

the pressure in the fluid is related to the speed of flow

C?

• physics -

First of all, there IS no ideal fluid. For a given pressure drop across a pipe, the flow will be SLOWER if the diameter is less.

What this problem should have asked is FOR A GIVEN VOLUME FLOW RATE, how does diameter affect velocity.

None of the choices are correct. The assumption is also not correct. From a given reservoir, the fluid velocity from any size hole in the bottom will be the same.

• physics -

drwls, quite frankly, that dosnt help anoyone.

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