3 years ago

Why does the sky change colors at sunset?

1 answer:

8 0

The sky changes colors at sunset because the atmosphere ABSORBS some colors of light more than other colors.

The second choice ("The atmosphere bends light") is a correct statement, but it's not the reason that the sky changes colors at sunset.

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What did Ernest Rutherford expect to happen when he aimed a beam of particles at a thin gold foil

nikitadnepr [17]

Answer:

he expected a fire to happen I think

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3 years ago

Is the amount of energy in a sound wave per unit of time and is also related to the loudness of a sound.

aleksandrvk [35]

I'm kinda late on telling you the answer but the answer is Intensity. I know it is correct because I had the same question.

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3 years ago

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Which structure contains cells that attach to the molecules we breathe in?

Dmitriy789 [7]

Answer:

I’m pretty sure it would be the sinus cavity

Explanation:

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What is the speed of a wave that has a wavelength of 0.5 m and the frequency of 65Hz??

timofeeve [1]

Answer:

32.5 m/s

Explanation:

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3 years ago

Twopucksofequalmasscollideonafrictionlesssurface,asillustratedinthefigure.Immediatelyafterthe collision, the speed of the black

seropon [69]

Answer:

The speed of the white puck immediately after the collision is 2.6 m/s.

Explanation:

Given that,

Two pucks are equal masses.

Speed of black puck = 1.5 m/s

According to given figure,

We need to calculate the speed of the white puck immediately after the collision

Using law of conservation of momentum

$mv=m_{1}v_{1}\cos\theta+m_{2}v_{2}\cos\theta$

Put the value into the formula according to figure

$m\times3=m\times v_{1}\times\cos30+m\times1.5\times\cos60$

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$v_{1}=\dfrac{3-0.75}{0.866}$

$v_{1}=2.6\ m/s$

Hence, The speed of the white puck immediately after the collision is 2.6 m/s.

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3 years ago