Go Back   Physics Help Forum > College/University Physics Help > General Physics

General Physics General Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Nov 14th 2017, 05:08 AM   #1
Junior Member
 
Join Date: Nov 2017
Posts: 4
Please help! How big does the semi circle need to be?

Hello there,

The problem that one of my students came to me with is:

I want to fit 240 grams of chocolate into a semi circle, so could you tell me the diameter I need to make the semi circle in mm?

I have worked out that the volume of a 100mm diameter semi circle is 5235 cubic mm, but then how do I apply that?

Please help! Many thanks!

Last edited by JJLondon; Nov 14th 2017 at 05:35 AM.
JJLondon is offline   Reply With Quote
Old Nov 18th 2017, 06:18 AM   #2
Senior Member
 
Join Date: Aug 2010
Posts: 232
A "circle" or "semi-circle" doesn't have any volume at all! Do you mean "hemi-sphere" or perhaps a semi-circle with a given height (a cylinder)? I have no idea how you got 5283 cubic mm. A hemisphere with radius 100 mm has volume 2094395 cubic mm. A semi-circle with radius 100 mm has area 15708 square mm. The volume depends upon the height. In order to have a volume of 5235 cubic mm, height would have to be 3 mm. Are you assuming that?

In any case you would need to have a certain volume of chocolate, in cubic mm, not mass in grams. To determine that you need to divide the given "240 grams" by the density of the chocolate- and that varies with the type of chocolate though it averages around 1325 kilograms per cubic meter= 0.001325 grams per cubic mm.
HallsofIvy is offline   Reply With Quote
Reply

  Physics Help Forum > College/University Physics Help > General Physics

Tags
big, circle, semi



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Semi-Conductors victorawodi Advanced Electricity and Magnetism 0 Nov 14th 2014 04:00 AM
Magnetic Flux of semi-circle within a circle BloodBaneZXY Electricity and Magnetism 1 Feb 15th 2010 06:15 PM
Semi-Atwood Machine chrisfnet Kinematics and Dynamics 3 Sep 28th 2009 11:53 PM
Would this be right to say Fc is out of the circle? Phatmat Periodic and Circular Motion 1 May 10th 2009 03:19 AM
Vertical Circle Kace_d Periodic and Circular Motion 1 Oct 6th 2008 11:40 AM


Facebook Twitter Google+ RSS Feed