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Introductory Physics Homework Help
Angular Momentum of a rotating mass
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[QUOTE="grassstrip1, post: 5485565, member: 504511"] [B][ATTACH=full]101350[/ATTACH] 1. Homework Statement [/B] When the 3.2-kg bob is given a horizontal speed of 1.5 m/s, it begins to rotate around the horizontal circular path A. The force F on the cord is increased, the bob rises and then rotates around the horizontal circular path B. (picture included) [h2]Homework Equations[/h2] L = I ω v = rω [h2]The Attempt at a Solution[/h2] The solution from the book goes into a long procedure with summation of forces to find the angle etc. I tried this Since there is no moment about the z axis angular momentum is conserved about the z axis. I[SUB]1[/SUB]ω[SUB]1[/SUB] = I[SUB]2[/SUB]ω[SUB]2[/SUB] For a particle I= mr[SUP]2[/SUP] so initially, I = (3.2)(0.6sinθ)[SUP]2[/SUP] and after I = (3.2)(0.3sinθ)[SUP]2[/SUP]. For ω, initially it is (0.6)(sinθ)(1.5m/s) at the end is is (0.3sinθ)(v[SUB]2[/SUB]) Setting these equal to each other and solving gives v=12m/s But the answer is 2m/s Not sure where I am going wrong. Thank you! [/QUOTE]
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Introductory Physics Homework Help
Angular Momentum of a rotating mass
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