a car on a roller coaster is in its lowest position on its circular track and the apparent weight of one of the riders is 4.0 times her actual weight. if the radius of the circular track is 19m find the speed of the roller coaster.

c. rb

explanation:

the atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.

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the answer is a)

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