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    mary13's Avatar
    mary13 Posts: 1, Reputation: 1
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    #1

    Oct 16, 2008, 11:45 PM
    physics speed
    a roller coaster has a dip in a vertical circle of radius r. the passenger feels the seat push upward with a force equal to twice her weight. The r = 20.0 m, how fast is the roller coaster going at the bottom of the dip.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Oct 17, 2008, 07:28 AM

    To get you started: The acceleration of an object traveling in a circular motion is v^2/r. Since F=ma, the force needed to keep the object moving in a circular motion is F = mv^2/r. So now you just need to determine how much force the girl felt that was contributed by her circular motion. Can you take it from here?
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