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Center of mass of semicirculardisk calculated from center of mass of semicircular arc 
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#1
Oct2010, 07:40 AM

P: 56

i have calculated the C.M. of semicircular arc of radius r and mass m.
How can i use this answer to calculate the C.M of semicircular disk of radius r and mass m? thanks:) ps. how about the converse? 


#2
Oct2010, 10:03 AM

P: 15

just consider the disk is formed with many semi circular arcs
and for the converse case , there are 2 methods 1. consider the CM a semi circular shell, ie. a (disk)  (another disk with smaller radius), then take limit for the radius of the small one approach the bigger one 2. consider the semi circular disk as many triangular laminar...... 


#3
Oct2010, 11:06 PM

P: 56

"2. consider the semi circular disk as many triangular laminar......"Triangle??confused.Why?and what do you mean by traingular "laminar"???? 


#4
Oct2010, 11:42 PM

P: 15

Center of mass of semicirculardisk calculated from center of mass of semicircular arc
2. laminar means layer or plane etc. Just think that a semi circle is formed with many sectors, when the sectors become smaller, it will look like many triangle. 


#5
Oct2110, 02:40 AM

P: 56




#6
Oct2110, 08:12 AM

P: 15




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