Uniform circular disk of radius

[johnnyb]

Any help would be great

Show that the centre of the mass of a uniform circular disk of radius, R, is at a point (4/3pi)R from the centre of the circle.

 

[whozum]

The center of mass of a uniform disk is the center.

 

[johnnyb]

Yeh that's what I'm having a problem with, seems like a stupid question, but still have to prove that it is (4/3pi)R

 

[neutrino]

Any help would be great

Show that the centre of the mass of a uniform circular disk of radius, R, is at a point (4/3pi)R from the centre of the circle.

Where is the circle located?

 

[johnnyb]

Thats all the information that is given

Show that the centre of the mass of a uniform circular disk of radius, R, is at a point (4/3pi)R from the centre of the circle

Altho below it does say...

X co-ord is obvious..to find y co-ord integrate using

Mr = \intrdm

and transform y into an appropriate co-ord system

 

[johnnyb]

any ideas?

 

[whozum]

that doesn't make sense. i don't know what to tell you.

 

[johnnyb]

Don't worry bout it, i'll keep trying

 

[dextercioby]

In the way it's formulated,the problem's incorrect.It would have made it interesting,if it had mentioned about a half of the initial disk.

Daniel.

 

[DaveC426913]

This is nonsense.

The centre of mass of a circular disc with radius 1 unit is going to be 4.19 units from the centre of the disc?


I'd like to see that!
(I could make an end table for my desk that floats in mid-air!)