Posted by **Confused** on Friday, October 2, 2009 at 1:05pm.

A Ferris wheel 28.0m in diameter rotates once every 21.0s.

What is the ratio of a person's apparent weight to her real weight at the top?

What is the ratio of a person's apparent weight to her real weight at the bottom?

- math -
**MathMate**, Friday, October 2, 2009 at 1:25pm
radius, r = 28/2 m =14 m

Period, T = 21 s

angular velocity, ω = 2π/21 rad/s

Centrifugal force, f= mrω²

actual weight, w = mg

apparent weight at top, wt = mg -f

apparent weight at bottom, wb = mg+f

Solve for f and calculate wt/w and wb/w.

- math -
**Otis**, Monday, October 4, 2010 at 11:46pm
so i have a question how do you solve for f if there is no m?

- math -
**matt**, Wednesday, October 27, 2010 at 9:01am
the m's cancel at some point in the equation

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