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Progress is impossible without change; and those who cannot change their minds cannot change anything. ..."George Bernard Shaw(1865-1950, Irish dramatist, essayist and critic, Nobel Prize for Literature 1925)"

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 Author Topic: Physical Quantities and Units (II)  (Read 20448 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
sakuralim
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 « Embed this message on: July 05, 2005, 09:31:30 pm »

HI Hi ^^
need help again

1. The viscous drag [i:2f39b02284]F[/i:2f39b02284] on a sphere moving in a liquid depends on [i:2f39b02284]a[/i:2f39b02284], radius of sphere, [i:2f39b02284]v[/i:2f39b02284] its velocity and [i:2f39b02284]n[/i:2f39b02284] the viscousity of the liquid. Use the method of dimension to derive an equation for [i:2f39b02284]F[/i:2f39b02284] in terms of [i:2f39b02284]a, v and n.[/i:2f39b02284]

2. The velocity of sound in medium depends on the wavelength [i:2f39b02284]L[/i:2f39b02284], Young modulus [i:2f39b02284]E[/i:2f39b02284] and density [i:2f39b02284]p[/i:2f39b02284] of the medium. Use the method of dimension to derive an equation for [i:2f39b02284]v[/i:2f39b02284] in terms of [i:2f39b02284]L, E and p.[/i:2f39b02284]

I will be very glad and thank you so much for your help ^^
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Fu-Kwun Hwang
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 « Embed this message Reply #1 on: July 07, 2005, 08:24:59 am »

I already show you how to do dimension analysis in another post. http://www.phy.ntnu.edu.tw/ntnujava/viewtopic.php?t=326

If you still have problem , please post what you have done and I will try to help you.
But I do not want to post the answer before you try it out first.
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sakuralim
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 « Embed this message Reply #2 on: July 07, 2005, 04:13:24 pm »

hehe
Well I try my best and crack my brain
at last, I understand it.
hehe
thanks to you, HWANG
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Fu-Kwun Hwang
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 « Embed this message Reply #3 on: July 10, 2005, 03:06:52 pm »

Try to find out the answer by yourself is better than view the answer from some where.
It good to hear that you understand it.
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Progress is impossible without change; and those who cannot change their minds cannot change anything. ..."George Bernard Shaw(1865-1950, Irish dramatist, essayist and critic, Nobel Prize for Literature 1925)"