# A model train, with a mass of #12 kg#, is moving on a circular track with a radius of #9 m#. If the train's rate of revolution changes from #6 Hz# to #4 Hz#, by how much will the centripetal force applied by the tracks change by?

The centripetal force will decrease by a factor of

Just learnt circular motion today so . . . umm, answer might not be 100% correct. Anyhow, we first need to find the angular speed to find centripetal force. Angular speed is found using

Now to find centripidal force, we need the equation

Placing our values into this formula, we get

Thus, we can now find the difference between the centripetal force applied by the tracks.

Hope this helps.

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The centripetal force change is 754.16 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 #2 kg#, is moving on a circular track with a radius of #2/3 m#. If the train's rate of revolution changes from #1/2 Hz# to #1/5 Hz#, by how much will the centripetal force applied by the tracks change by?
- Two objects have masses of #3 MG# and #10 MG#. How much does the gravitational potential energy between the objects change if the distance between them changes from #130 m# to #24 m#?
- You're conducting a physics expenmnt on another planet. You drop a rock from a height of 1 m and it hits the ground 0.4 seconds later. What is the acceleration due to gravity on this planet?
- A model train, with a mass of #6 kg#, is moving on a circular track with a radius of #4 m#. If the train's kinetic energy changes from #27 j# to #42 j#, by how much will the centripetal force applied by the tracks change by?
- What would happen to the acceleration due to gravity, and to our acceleration toward the centre of the Earth, if the Earth stopped rotating?

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