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wizzle
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Homework Statement
A carpenter's square has the shape of an
"L," as shown at the right. Find the
coordinates of its center of mass, assuming
it to be made of uniform, material. (Hint:
divide the L-shape into two rectangles.)
Homework Equations
MaXa+MbXb/(Ma + Mb)
The Attempt at a Solution
I separated the L shape into two rectangles, with the upper part of the L being a rectangle of 14 cm x 4 cm, and the lower part of the L is a rectangle measuring 4 cm by 12 cm. I found the centre of mass of the upper rectangle to be (2,9) and of the lower rectangle to be (6,2). For the mass, since it's of uniform material, I used the area as its mass (not sure if that's right). The technique I tried was to first find the x-coordinate of the object's centre of mass:
(2x56)+(6x48) / (56+48) = 3.846 cm
For the y coordinate I used the y values of each rectangle:
(9 x 56)+(2x48) / (56+48) = 5.77 cm
So the centre of mass I got was (3.8 cm, 5.8 cm). Were the steps I used sensible?
Thanks a lot!
-Lauren