Using the term c in this case is a little confusing. It is more generic to use a general velocity, v. That way, in this case, we know to use the speed of sound.
wavelength*frequency=v
wavelength_20Hz = (345 m/s)/(1/20s)
<span>wavelength_20kHz = (345 m/s)/(1/20000s)
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Potable water is also known as drinking water which is safe to drink and for cooking purposes
The Answer would be false! electromagnet does attract to iron
Answer:
Using simple mechanics its D thats because A wouldn't make sense at all and C wouldn't be related, D might be.
So we're left with B and D. So B is wrong becuase that wouldn't affect the shape it depends on how it was created and how much interaction with other galaxies have made (gravity w/ mass). So if you understand Stephen Hawking he said that nature is not perfect and can change. The masses can change and can be collided therefore the answer is:
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D</u></h2>
