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Elena L [17]
3 years ago
12

A friction like force that oppose motion of objects moving through the air is why we like to called

Physics
1 answer:
Art [367]3 years ago
4 0

Air resistance ------- - - -- - - - :)

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A 2.99-m-long2.99-m-long rod, as measured in its rest frame, speeds by you longitudinally at 6.49×107 m/s6.49×107 m/s . You meas
Rasek [7]

Answer:

The contraction in the rod is 71 mm.

Explanation:

Given that,

original length L'= 2.99 m

Speed v= 6.49\times10^{7}\ m/s

We need to calculate the length

Using expression for length contraction

L'=\gamma L

L=\dfrac{L'}{\gamma}

Where,

\gamma=\dfrac{1}{\sqrt{1-\dfrac{v^2}{c^2}}}

L=\sqrt{1-\dfrac{v^2}{c^2}}L'

Where, v = speed of observer

c = speed of the light

Put the value into the formula

L=\sqrt{1-\dfrac{(6.49\times10^{7})^2}{(3\times10^{8})^2}}\times2.99

L=2.919\ m

The expression for the contraction in the rod

d =L'-L

d=2.99-2.919

d=0.071

d= 71\ mm

Hence, The contraction in the rod is 71 mm.

7 0
4 years ago
Centripetal force on an object in circular motion is always directed in which direction?
r-ruslan [8.4K]
The centripetal force<span> is the resultant </span>force<span> that causes this acceleration, and it is </span>always directed<span> towards the center of the </span>circle<span>. Without the resultant </span>centripetal force<span>, an </span>object<span> would travel at a constant velocity (constant speed and </span>direction<span>).

So the correct answer would be A : Toward the center of the circle. 

Hope this helps :)
</span>
3 0
3 years ago
Scientists infer that ancient geologic features formed through the same processes they observe today based on the principle of?
Gnom [1K]

Answer: uniformitarianism

Explanation:

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4 years ago
INTEGRATED SCIENCE-8th grade science <br> Please help report cards are due for me at dec.18
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Our drinking water comes from lakes, rivers and groundwater. For most Americans, the water then flows from intake points to a treatment plant, a storage tank, and then to our houses through various pipe systems. A typical water treatment process.

Explanation:

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3 years ago
Celina has a water sample that’s contaminated with salt and microorganisms. Which method should she use to purify the water?
TEA [102]

Answer:

Reverse Osmosis and UV Treatment

Explanation:

Reverse Osmosis, commonly known as RO, process is very effective in removing salt content from water. This process is known as desalination. IN RO, a partially permeable membrane is used to remove unwanted molecules, ions, and large particles. RO will take care of both desalination and purification of water.

Further UV treatment can be done to kill any remaining microorganisms as these microorganisms can not withstand UV radiation.

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