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3 years ago

9

Why has Earth’s climate changed so rapidly in recent years? A The sun has gotten much hotter. B People are eating too many plant

s. C People are burning too many fossil fuels. D The Earth is rotating too slowly to cool off effectively.

1 answer:

professor190 [17]3 years ago

6 0

Answer:

The answer is C

Explanation:

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Hi , the jobs are
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the capillaries , enable the actual exchange of water and chemicals between the blood and the tissues
veins, carry the blood from the capillaries back toward the heart

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viva [34]

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3 years ago

A communications satellite transmits a radio wave at a frequency of 9.4 x 10^9 Hz. What is the signal’s wavelength? Assume the w

sergejj [24]

To calculate this we will use the light equation:
$c=$ λ $*f$

We have Frequency $f=9.4* 10^{9}Hz$ .
We know that speed of light in vacuum is $c =3.8* 10^{8} m/s$ .
Since a unit of speed of light is m/s, we can change the unit of frequency Hz to 1/s, since Hz means cycles per second (f=1/T).

So:
$f=9.4* 10^{9}1/s$
<span> $c =3.8* 10^{8} m/s$
</span>
<span> $c=$ λ $*f$
</span>⇒ λ $= \frac{c}{f}$
⇒ λ $= \frac{3.8* 10^{8}}{9.4* 10^{9}}$
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3 years ago

Which statement correctly describes the difference between a polar covalent bond and a nonpolar covalent bond?

Sauron [17]

Answer:

D: Nonpolar covalent bonds involve two atoms that have equal electonegativity whereas polar covalent bonds involve two atoms that are unequal in their electronegativity.

Explanation:

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3 years ago

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