Circular motion problem
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Circular motion problem

[From: ] [author: ] [Date: 12-06-14] [Hit: ]
Help, please!Thanks!-Force on the body due to earths gravity--one G downward.Force needed for weightless or net zero G--one G upward and one G downward.Force on the body to press it into the seat at half the weight in any direction-- 0.......
I can't seem to figure out this problem. I tried using F= (mv^2)/r, and figured F/m = .5 and then multiplied times the radius to find the velocity, but my answer is wrong.

Problem: At a given instant, someone strapped into a roller coaster car hangs upside down at the very top of the circle (of radius 25 m) while executing a so-called loop-the-loop. At what speed must s/he be traveling if at that moment the force exerted on her/his body on the seat is half her/his actual weight? Assume that at the start of the ride the straps were fairly loose.

= ? m/s

Help, please! Thanks!

-
Force on the body due to earth's gravity--one G downward.
Force needed for "weightless" or net zero G--one G upward and one G downward.
Force on the body to press it into the seat at half the weight in any direction-- 0.5G.
Net force needed-- 1.5G.
Try doing it now.
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keywords: motion,problem,Circular,Circular motion problem
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