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Homework Help
Introductory Physics Homework Help
Difficult time with motion graphs & dynamics
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[QUOTE="devilish_wit, post: 6069244, member: 651841"] [h2]Homework Statement [/h2] The figure below shows the speed of a person's body as he does a chin-up. Assume the motion is vertical and the mass of the person's body is 72.7 kg. Determine the force exerted by the chin-up bar on his body at the following times. [ATTACH=full]231930[/ATTACH] My answers: [ATTACH=full]231929[/ATTACH] [h2]Homework Equations[/h2] F = ma [h2]The Attempt at a Solution[/h2] I'm not quite sure how to solve that last part: I solved for the acceleration at 1.6s which is -60m/s^2. F = ma -mg + T = m a T = 72.7kg(60m/s^2) + (9.8m/s^2)(72.7kg) T = 3649.54?? (this one's wrong) [/QUOTE]
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Introductory Physics Homework Help
Difficult time with motion graphs & dynamics
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