If the earth had uniform density, the gravitational potential of a mass m at a point in the interior of the earth, a distance r away from the earth's center, would be given by U(r), where M is the mass of the earth, and R is its radius. Suppose that a tunnel were drilled straight down through the center of the earth and coming out on the other side. How long would it take a stone dropped at one end to reach the other end

be subject to a force andchange its motion

current flows in a wire

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.