Adding Reply Archived Topic: It will not be bumped to the top of the forum. Topic Physics, Density. Membername   Not a member? Sign Up Free (takes 20 seconds) Password   Forgotten your password? Post Font: Verdana Arial Black Georgia Comic Sans Impact   Size: Tiny Normal Big Huge   Color: Default Dark Red Red Orange Brown Green Olive Cyan Blue Dark Blue Indigo Black [ Check Spelling ] [ Post Preview ] [ LiveTags ] FAQ Keyword Search: Post Options Favorites Manager Notify me of new replies to this topic by email Notify me of new replies to this topic by private message Original Post woolo Posted at 10:53 am on Aug. 24, 2008 I'm stuck on a physics question, any help would be great! A cylindrical cone of semi-angle α, height H and mass M is submerged in a fluid of density ρ. Givecn that the volume of a cone is 1/3 area of base x height, find the depth to which it is submerged. Any ideas?

Replies ElephantStone Posted at 11:14 am on Aug. 24, 2008 Lets think...what is density...density is the amount of matter in an object, if Im correct so that is the volume of the cone which is (1/3)(pie.r^2)(H).... There are 2 things that can happen: the cone can sink, or float, depending on whether it is less dense or more dense than the fluid... So (1/3)(pie.r^2)(H)>p Now thats a test, lets see if it can be proved... archimedies principle applies here I think.. well change density to pressure (1/3)(pie. r^2) H = row.g.H cancelt he Hs (1/3)(pie.r^2)=row.9.8 (pie.r^2)/row=9.8/1.333 ditto            =7.351 I lost myself now, but it goes something liek that Im sure. Hopefully my notes might be of some use. Ill come back later and try. woolo Posted at 11:06 am on Aug. 24, 2008 No sadly all the notes i have include mass as a variable. However this does not include any hint to the mass of the object. :( Violently Happy Posted at 11:05 am on Aug. 24, 2008 Don't you have notes that could help you? BodomChick Posted at 11:02 am on Aug. 24, 2008 that's rather difficult. woolo Posted at 10:58 am on Aug. 24, 2008 I guess the answer should be in algebra form. I just realy don't know what it's asking me. Total Destruction Posted at 10:56 am on Aug. 24, 2008 Post from this position was omitted due to content violations Baron Samedi Posted at 10:54 am on Aug. 24, 2008 Post from this position was omitted due to content violations LittleItaly Posted at 10:54 am on Aug. 24, 2008 Post from this position was omitted due to content violations All 8 previous replies displayed.