A periodic wave on a string has a wavelengths of 25cm and a frequency of 3hz, what's the speed of the wave?

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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the answer to this is proletariats.

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