# An object with a mass of #2 kg# is revolving around a point at a distance of #5 m#. If the object is making revolutions at a frequency of #1 Hz#, what is the centripetal force acting on the object?

where ,

m is the mass of the particle , v is the velocity of the particle, and r is the radius of the circle of revolution.

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The centripetal force acting on the object is 20 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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