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Semmy [17]
3 years ago
11

The spectra of most stars are dark-line spectra because ________.

Physics
1 answer:
pav-90 [236]3 years ago
5 0
Because dark line spectra result from passing white light through ionized gasses and plasmas, which is what the atmosphere of stars are made of.  These frequencies are scattered by the star's atmosphere as it leaves the surface (photosphere) of the star, and don't make it to earth.
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Difference between relaxation time and collision time?
Black_prince [1.1K]
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. During a collision with a wall, the velocity of a 0.200-kg ball changes from 20.0 m/s toward the wall to 12.0 m/s away from th
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Answer:

106.7 N

Explanation:

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where

F is the average force

\Delta t is the duration of the collision

m is the mass of the ball

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In this problem:

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F=\frac{m(v-u)}{\Delta t}=\frac{(0.200 kg) (-12.0 m/s-20.0 m/s)}{0.06 s}=-106.7 N

And since we are interested in the magnitude only,

F = 106.7 N

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What is the momentum of an 18-kg object moving at 0.5 m/s?
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