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jonny_d Member Join Date: Oct 2007 Posts: 7	Help! 10/25/2007 10:16 PM
	Can someone tell me How manny pounds can be lifted when a vacuum of 10'' is applied to a 3'' vacuum cup? Thanks
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This discussion was "closed" on 10/26/2007 8:36 AM. No new comments are allowed.

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cnpower Guru Join Date: Sep 2006 Location: CHINA Posts: 2945 Good Answers: 14	#1 Re: Help! 10/25/2007 11:09 PM
	？ what are u saying?
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jonny_d Member Join Date: Oct 2007 Posts: 7	#2 Re: Help! 10/26/2007 12:14 AM
	it is a question on my homework that reads; How manny pounds can be lifted when a vacuum of 10'' is applied to a 3'' vacuum cup? It gives a formula ; 1''=0.491 psi
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JohnDG Guru Join Date: May 2006 Location: Reading, Berkshire, UK. Going under cover. Posts: 9684 Good Answers: 468	#3 In reply to #2 Re: Help! 10/26/2007 3:22 AM
	... so 10" = 4.91 psi (pounds per square inch). Assuming the cup is 3" diameter, area is ∏ * 1.5²= 7.07 in² So you can lift 4.91 x 7.07 = 34.7 lb. OK? You won't be allowed to use CR4 in an exam - I suggest you ask your teach. to explain what it all means, so next time you can do it for yourself. It ain't rocket science. __________________ "Love justice, you who rule the world" - Dante Alighieri
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#4 Re: Help! 10/26/2007 3:29 AM
	<a vacuum of 10''> The reader will probably qualify this as 10" of mercury column. 10" of water gauge is a totally different measurement! __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Chris Leonard Friend of CR4 Join Date: Dec 2004 Posts: 1776 Good Answers: 35	#5 Re: Help! 10/26/2007 8:36 AM
	CR4 is not a homework cheat site. While some here might relish the opportunity to sharpen up old rusty skills by working the homework problem, consider this and consider it well. If you cheat on your homework by using someone else's answers, you are only cheating yourself, because the purpose of any homework or other college assignments is to help you learn, by practice, repetition, and self-discovery. http://cr4.globalspec.com/faq#faq14a If you have any questions, please feel free to contact the CR4 Admin. __________________ Off to take on other challenges. Good luck everybody! See you around the Interwebs.
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This discussion was "closed" on 10/26/2007 8:36 AM. No new comments are allowed.

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Chris Leonard (1); cnpower (1); JohnDG (1); jonny_d (1); PWSlack (1)

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