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SAT® Subject Test in Physics

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Flying Out of Your Seat

SATPHY-YPX42Q

A roller coaster is designed so that at the very top of a particular hill, the riders need the seat belt to keep them from flying out of their seats. In fact, the seatbelt has to pull down on the riders with a force equal to half the weight of the riders.

How fast is the coaster moving at the top of this hill if its circular radius is $25.0\ m$ (Radius measured from center of circular hill to the seat of the coaster.).

A

$2.55\ m/s$

B

$245\ m/s$

C

$17.2\ m/s$

D

$15.7\ m/s$

E

$19.2\ m/s$