6.31. Model: The piano is in static equilibrium and is to be treated as a particle. Visualize:Solve: (a)Based on the free-body diagram, Newton’s second law is ()()net122211net123G311220 Ncoscos0 NsinsinxxxyyyyyFTTTTFTTTFTTTmgθθθθ==+=−==+++=−−−Notice how the force components all appear in the second law with plussigns because we are addingforces. The negative signs appear only when we
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