Here is a question, I discovered 2 approaches to resolve it, differing in the answers and also I"m not sure why a method is incorrect.

You are watching: Why is it the minimum power?

Question: A fire hose of cross area area A is compelled to direct a jet of water to a height h, the minimum power of the pump necessary for this hose is?

Method 1: $$dp = ho A dxV$$$$F = ho A V^2$$$$P = F.V = ho A V^3$$

Method 2: $$m = ho A dx$$$$KE = frac12mV^2 = frac12 ho A dx V^2$$$$P = frac12 ho A V^3$$

The correct answer stated is the one derived from method 2.Can anyone define why the initially strategy is wrong?

homework-and-exercises energy-conservation work-related power
Share
Cite
Improve this question
Follow
asked May 18 "14 at 6:38

sushant-hiraysushant-hiray
$endgroup$

1
$egingroup$
Your initially strategy is wrong, bereason the velocity is not consistent in the time of the totality trajectory. This is what you implicitly assumed in the last step of the first method.

Share
Cite
Follow
answered May 18 "14 at 6:40

BernhardBerndifficult
$endgroup$
1

Thanks for contributing a solution to slrfc.org Stack Exchange!

But avoid

Asking for aid, clarification, or responding to other answers.Making statements based upon opinion; earlier them up with references or individual endure.

Use MathJax to format equations. MathJax recommendation.

See more: Why Does The Value Of A Share Of Stock Depend On Dividends? ?

Draft saved

Submit

### Message as a guest

Name
Email Required, yet never shown

### Post as a guest

Name
Email

Required, yet never before shown

## Not the answer you're looking for? Browse various other inquiries tagged homework-and-exercises energy-conservation job-related power or ask your own question.

The Overcirculation Blog
Featured on Meta
Related
2
Distance traveled by a water jet
4
Block slides dvery own a movable ramp, 2 approaches returns different answer
0
A Pump is spraying water to create a fountain
1
If a complimentary jet of liquid is exiting from a tube right into the air, why is the push of the liquid exiting atmospheric as soon as not submerged?
0
Power of a Hydraulic Pump and Rate at which Kinetic Energy is imparted to the water
Hot Network Questions even more hot concerns

Inquiry feed

slrfc.org
Company
site design / logo design © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. rev2021.12.22.41046

slrfc.org Stack Exchange functions best with JavaScript enabled