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08282009, 09:37 PM  #21 

Re: Anyone good at calculus based physics? I need some help
My solution for 1.a:
As stated before you'll have to find out the volume of said goldsample by: Mass / Density = Volume 4.831g / (19.32g/cm³) = 0.25005176 cm³ I also use a square as my base of calculation of the 'leaf': length x width x height = volume of square / leaf l x w x 4.562x10^6m = 0.25005176 cm³ > l x w = 0.00025005176 m³ / 4.562x10^6 m l x w = 54.8118719... m² nevermind the l x w, solution is: 54.8118719... m² Will try and solve the rest 1.b Using the volume from 1.a: Volume cylinder = r² x pi x h h = height = what we're looking for 0.00025005176m³ = [2.600x10^6 m]² x 3.1415 x h 0.00025005176m³ / ([2.600x10^6 m]² x 3.1415) = h 0.00025005176m³ / 2.1237x10^11m² = h Will quit now, good luck anyways 
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Last edited by RED; 08282009 at 09:52 PM..

08282009, 10:03 PM  #22 
Join Date: Feb 2009
Posts: 19
United States of America
Location: Philadelphia, PA

Re: Anyone good at calculus based physics? I need some help
Thanks for the effort all of you. I appreciate it a lot but it appears none of the answers were right for the first question :/ It might have been my calculator work but the second question, I got everything correct except B.
Answers for question 2 (a)3.31s (b)2.40e1 kg* this one was incorrect, I didnt have it in kg, i just had it in grams (c)2.64e2 kg/min (d)1.61e2 kg.min Answers for question 1 (a)0.05481 m^2 (b)11750 m I ended up with a 12.33/15 for this homework. I might be dropping this class but who knows. Thanks again for trying to help me. You guys were awesome. 
08292009, 04:31 AM  #23  

Re: Anyone good at calculus based physics? I need some help
Actually if you look at what I wrote for 1)a) that's not as wrong as your teacher thinks :
I wrote the surface of one side of the leaf is 0.0548 m2 and the whole surface of gold is twice as big (which is true). for 1)b) I think you made something wrong with the calculator, I get Length = 11771 m for : Quote:
Good job with the second, this one was rather difficult.  
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