- #1
TraceBusta
- 35
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I know how to find the center of mass of a 2 dimensional object like a piece of plywood or something like that, but when it comes to 3-D objects I'm clueless.
All I know is Mx=x1m1+x2m2+...xnmn
here is my problem, i don't know if i should split the pyramid into 4ths or not.
The Great Pyramid of Cheops at El Gizeh, Egypt, had a height H = 144.9 m before its topmost stone fell. Its base is a square with edge length L = 233 m. Its volume V is equal L2H/3. Assuming that it has uniform density p(rho) = 1.8 x 103 kg/m3.
(a) What is the original height of its center of mass above the base?
(b) What is the work required to lift all the blocks into place from the base level?
All I know is Mx=x1m1+x2m2+...xnmn
here is my problem, i don't know if i should split the pyramid into 4ths or not.
The Great Pyramid of Cheops at El Gizeh, Egypt, had a height H = 144.9 m before its topmost stone fell. Its base is a square with edge length L = 233 m. Its volume V is equal L2H/3. Assuming that it has uniform density p(rho) = 1.8 x 103 kg/m3.
(a) What is the original height of its center of mass above the base?
(b) What is the work required to lift all the blocks into place from the base level?