Posted by **Mel** on Wednesday, December 10, 2008 at 8:58pm.

A uniform rod of length 176 cm is bent at its midpoint into a right angle. Then the bent rod is placed along the negative x and positive y axes, with the "bend point" located at the origin. What are the x and y coordinates of the center of mass of this object?

my thoughts were that the coordinates were just (.44, .44) but it's incorrect. can someone help?

- Physics -
**bobpursley**, Wednesday, December 10, 2008 at 9:02pm
the cm along the x axis is 1/2 (-176/2) or -.44 m, and along the y axis .44m

You missed the sign.

- Physics -
**Mel**, Wednesday, December 10, 2008 at 9:06pm
Why is it negative?

I just plugged them into the computer, and it isn't accepting that answer. (-.44m, .44m), that is.

- Physics -
**drwls**, Wednesday, December 10, 2008 at 9:15pm
Perhaps they want the answer in cm.

The x coordinate of the C.M. is negative because half of the bent rod is in the -x region and the other half is along the x=0 axis.

- Physics -
**Mel**, Wednesday, December 10, 2008 at 9:34pm
I definitely missed that. Thanks.

I got an answer of -22 cm on x, and 22cm on y, put it into the computer, and it's right.

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