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OLga [1]
3 years ago
6

Mechanical waves can travel through _______.

Physics
1 answer:
eimsori [14]3 years ago
5 0

mediums only, mechanical waves always propagate through medium

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Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spe
belka [17]

Answer:

It means that the star is moving towards us.

Explanation:

The star is moving toward us; shift to a shorter wavelength. A shorter wavelength means a shift to the blue end of the spectrum (a blueshift) so that the object is moving toward us.

4 0
3 years ago
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PLZZZ HELP!!! What is the main difference between a permanent magnet and a temporary magnet?
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The domains in a temporary magnet easily lose alignment, but the domains in a permanent magnet keep their alignment.
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Which wavelength of the electromagnetic spectrum are shorter than visible light and carry more energy
geniusboy [140]

Answer:

C

Explanation:

Which wavelength of the electromagnetic spectrum are shorter than visible light and carry more energy

A micro

B radio

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F infrared

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4 × 10^-8 m

Therefore, ultravolet is shorter than visible light and carry more energy

Therefore, the correct answer is option C.

7 0
3 years ago
A biker goes up hill with a constant speed of 10km/h. Then he goes downhill with a constant speed of 50km/h. What's his average
Sladkaya [172]

This is not as simple as it looks.  

His average speed is NOT (10km/hr + 50km/hr)/2 = 30 km/hr.

You have to use the definition of speed:

Speed = (total distance covered) / (time to cover the distance).

Let's say the distance up (and down) the hill is 'd' .

Then the time it takes to go up the hill is (d/10) hours.

And the time it takes to come down the hill is (d/50) hours.

Total distance = 2d km

Total time = (d/10) + (d/50) = (5d/50) + (d/50) = 6d/50

Speed = distance/time = 2d/(6d/50) = 100d/6d

<em>Speed = </em>100/6 = <em>16-2/3 km/hr</em>

4 0
3 years ago
A basketball player can jump 1.6 m off the hardwood floor. With what upward velocity did he leave the floor?
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First do 1.6 m (how far he jumps) 9.8 m/s (what gravity is measured at) then times 2

= 31.36

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3 years ago
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