# A model train with a mass of #5 kg# is moving along a track at #14 (cm)/s#. If the curvature of the track changes from a radius of #84 cm# to #21 cm#, by how much must the centripetal force applied by the tracks change?

The change in centripetal force is

Centripetal force is what

The radii are

additionally

The centripetal force's variance is

What are the centripetal forces?

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The centripetal force must increase by a factor of 4.

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