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MAXImum [283]
2 years ago
6

A star is moving towards the earth with a speed at 90% the speed of light. It emits light, which moves away from the star at the

speed of light. Relative to us on earth, what is the speed of the light moving toward us from the star?
Physics
1 answer:
AnnyKZ [126]2 years ago
5 0

Answer:

The speed of light measured in any frame is c = 3.00E8 m/s.

This is one  of Einstein's  postulates of special relativity.

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3 years ago
what is the value of the constant for a second order reaction if the reactant concentration drops from .657 M to ,0981 M in 17 s
yaroslaw [1]

Answer : The value of the constant for a second order reaction is, 0.51M^{-1}s^{-1}

Explanation :

The expression used for second order kinetics is:

kt=\frac{1}{[A_t]}-\frac{1}{[A_o]}

where,

k = rate constant = ?

t = time = 17s

[A_t] = final concentration = 0.0981 M

[A_o] = initial concentration = 0.657 M

Now put all the given values in the above expression, we get:

k\times 17s=\frac{1}{0.0981M}-\frac{1}{0.657M}

k=0.51M^{-1}s^{-1}

Therefore, the value of the constant for a second order reaction is, 0.51M^{-1}s^{-1}

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Which structure is found in all EUKARYOTIC cells? Large central vacuole, Golgi apparatus, flagella, cilia
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HOPE THIS HELPS!
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