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gogolik [260]
3 years ago
10

WILL MARK BRAINLIEST!

Physics
2 answers:
Vlad1618 [11]3 years ago
7 0
<span>B.Shape of continents look like puzzle pieces that can fit into one another</span>
elena55 [62]3 years ago
4 0
Alfred Wegener's hypothesis was that all the continents<span> had once been joined together in a single landmass and have since drifted apart.
So, the answer is A

</span>
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Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a
blagie [28]

Answer:

The maximum speed at which the car can safety travel around the track is 18.6m/s.

Explanation:

Since the car is in circular motion, there has to be a centripetal force F_c. In this case, the only force that applies for that is the static frictional force f_sbetween the tires and the track. Then, we can write that:

f_s=F_c

And since f_s\leq \mu N and F_c=\frac{mv^{2}}{r}, we have:

\mu N\geq \frac{mv^{2}}{r}

Now, if we write the vertical equation of motion of the car (in which there are only the weight and the normal force), we obtain:

N-mg=0\\\\\\implies N=mg

Substituting this expression for N and solving for v, we get:

\mu mg\geq \frac{mv^{2}}{r}\\\\v\leq \sqrt{\mu gr}

Finally, plugging in the given values for the coefficient of friction and the radius of the track, we have:

v\leq \sqrt{(0.42)(9.81m/s^{2})(84.0m)}\\\\v\leq 18.6m/s

It means that in its maximum value, the speed of the car is equal to 18.6m/s.

7 0
2 years ago
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What are newtons three laws of motion?
BlackZzzverrR [31]
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8 0
3 years ago
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if an object is being acted on by two forces a push and a pull of 6N what is the net force of the object
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6 0
3 years ago
They don't have an Astronomy Section and I believe that this falls the closest to Physics
Ksenya-84 [330]
The only thing we know of so far that can shift light to longer wavelengths is the "Doppler" effect. If the source and the observer are moving apart, then the observer sees wavelengths that are longer than they should be. If the source and the observer are moving toward each other, then the observer sees wavelengths that are shorter than they should be. It works for ANY wave ... sound, light, water etc. The trick is to know what the wavelength SHOULD be. If you know that, then you can tell whether you and the source are moving together or apart, and you can even tell how fast. If the lines in a star"s spectrum are at wavelengths that are too long, then from everything we know right now, the star and Earth are moving apart.
5 0
3 years ago
What is the period of a wave if the wavelength is 100 m and the speed is 200 m/s?
Stells [14]
This is simple question and easy to understand.
so first you use a formula to calculate frequency of the wave.
v _ stands for velocity a.k.a speed
f_ stands for frequency which you have to find.
(pronounced lemda)_ stands for wavelength.
Then you gonna place all your values according to you have in the formula as shown then solve for f.
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where
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Simply input your values according to the formula and you your answer as 0.5s

8 0
3 years ago
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