What are some modern uses for infrasound example, ultrasound can be used in the medical field to look inside people. Thanks!

1 answer:

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Infrasound sound is any sound that are below the sound a human can hear, elephants use it to communicate with other elephants.

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Compare and contrast formation of with the formation of mgcl2

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3. How does Earth’s rotation affect our view of stars

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Since we ride along with the Earth while it's doing whatever it does,
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If we try to keep watching one star, we have to keep changing the
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Muscular Strength exercises focus on high______and low___

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REMARKS The speed found in part (a) is the same as if the woman fell vertically through a distance of 21.9 m. The result of part

sasho [114]

Answer:

Yes, if the system has friction, the final result is affected by the loss of energy.

Explanation:

The result that you are showing is the conservation of mechanical energy between two points in the upper one, the energy is only potential and the lower one is only kinetic.

In the case of some type of friction, the change in energy between the same points is equal to the work of the friction forces

$W_{fr}$ = ΔEm

$W_{fr}$ = $Em_{f}$ -Em₀

As we can see now there is another quantity and for which the final energy is lower and therefore the final speed would be less than what you found in the case without friction.

$Em_{f}$ = $W_{fr}$ + Em₀

Remember that the work of the rubbing force is negative, let's write the work of the rubbing force explicitly, to make it clearer

½ m v² = -fr d + mgh

v = √(-fr d 2/m + 2 gh)

v = √ (2gh - 2fr d/m)

Now it is clear that there is a decrease in the final body speed.

Consequently, if the system has friction, the final result is affected by the loss of energy.

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