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Roller Coaster Force Question
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[QUOTE="Austin Gibson, post: 6071943, member: 650849"] [h2]Homework Statement[/h2] :[/B] A child of mass 40.0 kg is in a roller coaster car that travels in a loop of radius 7.30 m. At point [I]A[/I] the speed of the car is 15.0 m/s, and at point [I]B[/I], the speed is 15.6 m/s. Assume the child is not holding on and does not wear a seat belt. What is the force (in N) of the car seat on the child at point [I]B[/I]? (Enter the magnitude.) [ATTACH=full]232155[/ATTACH] [h2]Homework Equations[/h2] Fc = [(mv^2)/r] Fc = ma [h2]The Attempt at a Solution[/h2] : I solved (a) and (c). I solved (a) by inserting the mass, speed, and radius into the equation [(mv^2)/r] and subtracting by (mass*gravity). My equation for (b) was [(mv^2)/r * cos30] - mg = [(40*(15.6^2)/7.3*cos30) - (40*9.8) = 762.8 N. That was incorrect. What's improper about my equation? [/B] [/QUOTE]
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