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Unformatted text preview: be zero. and =-= =--+ = ∑ ∑ Tx Hx x Ty Hy y F F F Mg mg F F F The sum of the torques should also be zero. Use the end of the beam as the pivot point, we have: 1 . 1 2 . 2 = +-= ∑ mg F Hy τ M hinge supporting wire F T F H mg Mg 2. How many different positions of stable equilibrium and unstable equilibrium are there for a cube? Consider each surface, edge, and corner to be a different position. Answer There are 6 stable faces, and 20 unstable (12 edges and 8 corners) equilibrium positions for a cube that is made of uniform materials....
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This note was uploaded on 01/11/2011 for the course AP 1200 taught by Professor Michela.vanhove during the Spring '10 term at City University of Hong Kong.
- Spring '10