December 1st, 2011, 11:15 AM  #1 
Member Joined: Sep 2010 Posts: 39 Thanks: 0  center mass
The region between, y=1/x and the x axis from x=1 to x=7 is revolved about the x axis. find the CM of thin plate covering the region if the plates density at (x,y) is sqrt x Trying to understand the formula to solve. thanks. 
December 1st, 2011, 12:14 PM  #2 
Senior Member Joined: Nov 2011 Posts: 595 Thanks: 16  Re: center mass
The center of mass is on the x axis by symmetry. So you have to: 1) Calculate the total mass which is (because is the area of the circle at abscissa x) 2) Then the abcisse of the center of mass is PS: I wrote that quickly so check twice that there is no mistake or typos but the spirit should be there! Good luck. 

Tags 
center, mass 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
center of mass  boaz  Algebra  6  November 17th, 2013 11:40 AM 
Center of mass  slice_of_god  Real Analysis  1  June 4th, 2013 02:11 PM 
Moments,Center of Mass, & Centroid  layd33foxx  Calculus  1  January 28th, 2012 04:17 PM 
Center of Mass Query  astro  Physics  4  September 12th, 2010 09:39 PM 
Center of mass caluclation in excel  rekenprobleem  Calculus  2  February 12th, 2009 02:09 PM 