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3 years ago

14

A sound wave passes from air into water and then into steel. With each change in medium, what happens to the speed of the

1 answer:

Fiesta28 [93]3 years ago

6 0

Answer:

A

Explanation:

if its wronge im so sorry

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Describe the formation of galaxies.

olga2289 [7]

Today's cosmologists assume that matter was not uniformly distributed in the universe after the Big Bang. Dense places attract more matter than the surrounding area according to their gravitational forces. Over the course of billions of years, these gas agglomerations eventually led to the formation of the galaxies we see today.

3 0

3 years ago

In a computer-based experiment to study diffraction, the width of the central diffraction peak is 15.20 mm. The wavelength of th

pogonyaev

Answer:

$a = 5.7 \times 10^{-5} m$

Explanation:

As we know that position of first minimum on the either side of central maximum is given as

$a sin\theta = \lambda$

$\theta =sin^{-1} \frac{\lambda}{a}$

so the width of the central maximum is given as

$W = L (2\theta)$

so we have

$15.20 \times 10^{-3} = 0.68 \times 2(sin^{-1} \frac{\lambda}{a})$

so we have

$0.011 = sin^{-1} \frac{\lambda}{a}$

$0.011 = \frac{638 nm}{a}$

$a = 5.7 \times 10^{-5} m$

3 0

3 years ago

A rocket initially at rest accelerates at a rate of 99.0 meters/second ^2.Calculate the distance covered by the rocket if it. At

Pani-rosa [81]

The distance covered is 1000 m

Explanation:

The rocket is moving by uniformly accelerated motion, so we can find the distance it covers by using the following suvat equation:

$s=vt-\frac{1}{2}at^2$

where

s is the distance covered

v is the final velocity

t is the time

a is the acceleration

For the rocket in this problem, we have:

v = 445 m/s is the final velocity

$a=99.0 m/s^2$ is the acceleration

t = 4.50 s is the time

Substituting, we find the distance covered:

$s=(445)(4.50)-\frac{1}{2}(99.0)(4.50)^2=1000 m$

Learn more about accelerated motion:

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4 years ago

A pelican hunts fish in the water. As the pelican flies above the water’s surface, why must it aim for the fish in a slightly di

GarryVolchara [31]

Answer

A

Explanation

The light the fish absorbs is sunlight, the light reflecting is UV

5 0

3 years ago

Please help me, thank you

Mnenie [13.5K]

Answer:

a

Explanation:

7 0

3 years ago