# A model train with a mass of #2 kg# is moving along a track at #2 (cm)/s#. If the curvature of the track changes from a radius of #7 cm# to #1 cm#, by how much must the centripetal force applied by the tracks change?

The change in centripetal force is

The centripetal force is

The radii of the tracks are

and

The variation in the centripetal force is

The centripetal forces are

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The centripetal force applied by the tracks must increase by approximately 24.85 N.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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