# A model train, with a mass of #7 kg#, is moving on a circular track with a radius of #6 m#. If the train's rate of revolution changes from #1/2 Hz# to #2/7 Hz#, by how much will the centripetal force applied by the tracks change by?

The centripetal force will change by

Centripetal force is what

The centripetal force fluctuation is

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The centripetal force applied by the tracks will change by approximately 16.8 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.

- A model train, with a mass of #4 kg#, is moving on a circular track with a radius of #15 m#. If the train's kinetic energy changes from #96 j# to #48 j#, by how much will the centripetal force applied by the tracks change by?
- Given Newton's gravity formula, #F=G*(M*m)/(r^2)#, what are the SI units of the universal gravity constant, #G#?
- A model train with a mass of #2 kg# is moving along a track at #36 (cm)/s#. If the curvature of the track changes from a radius of #6 cm# to #3 cm#, by how much must the centripetal force applied by the tracks change?
- A model train with a mass of #5 kg# is moving along a track at #12 (cm)/s#. If the curvature of the track changes from a radius of #32 cm# to #24 cm#, by how much must the centripetal force applied by the tracks change?
- A model train, with a mass of #3 kg#, is moving on a circular track with a radius of #8 m#. If the train's rate of revolution changes from #1/4 Hz# to #1/8 Hz#, by how much will the centripetal force applied by the tracks change by?

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