If the distance from the moon to the Earth increased from 230,000 (which it is today) to 2,000,000 miles, what affect would this have on the tides?

Answer 1

effect is the right word.

The sun's affect on the tides would not effect a change in height, but the Moon, which is the predominate tidal factor, would affect the tides by the inverse of the change in gravity, that is 1/(2/.23)^2. So the effect would be to greatly decrease tidal height, the effected change about of height .013 of the previous height. What an affect.

http://www.wsu.edu/~brians/errors/affect.html