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3 years ago

Lauren pushed a book off the edge of a table. Which energy change occurs as the book falls from the table?

Physics

1 answer:

suter [353]3 years ago

3 0

Answer:

Potential to kinetic

Explanation:

Potential energy is the energy that is stored in an object that is kept in the stationary position. Kinetic energy is the energy that is stored in the moving object.

The book was primarily in the state of rest and had potential energy in it. When Lauren pushed the book, the potential energy changed into kinetic energy because it fell from the state of rest to state of motion.

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3 years ago

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Sarah's acceleration is $-0.49 m/s^2$

Explanation:

The force of kinetic friction acting on Sarah has a magnitude which is given by:

$F_f = \mu mg$

where

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Moreover, according to Newton's second law of motion, we know that the net force on Sarah is equal to its mass times its acceleration:

$F=ma$

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Since the force of friction is the only force acting on Sarah, we can say that the net force is equal to the force of friction, therefore:

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$a=-\mu g$

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$\mu = 0.05$ (coefficient of friction)

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we find:

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3 years ago

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Answer: MR²

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Explanation:

Since in the hoop , all mass elements are situated at the same distance from the centre , the following expression for the moment of inertia can be written as follows.

I = ∫ r² dm

= R²∫ dm

MR²

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