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Solving Slingshot Problem Homework
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[QUOTE="Krashy, post: 5951387, member: 637484"] [h2]Homework Statement [/h2] [ATTACH=full]221273[/ATTACH] [ATTACH=full]221274[/ATTACH] [h2]Homework Equations[/h2] Elastic potential energy = 1/2 * C * u^2 Ek = 1/2 * m * v^2 Efficiency = useful output/total input [h2]The Attempt at a Solution[/h2] [B]a) [/B]My main problem is to find the length of tension force. From the graph i can see that 12 cm corresponds to 100N, so i just need to find the length of the tension in cm and i can determine it in Newton. The solution states the tension forces are approximately 5.1cm long but i really can't figure out why, for me it seems they kinda arbitrarily picked a point on the slingshot but this can't be the reason. [B]b) [/B]I got it [B]c) [/B]So if i use the formula for kinetic energy i get: Ek = 1/2 * 26*10^-3 kg * (9.3 ms^-1)^2 = 1.12 J. But i don't know how to calculate the total energy input for the efficiency in this question. The solution says its 7.2J but i thought it should be the 6.0J from b)I hope someone can explain it to me, thanks for every answer. [/QUOTE]
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