'I am NOT an alcoholic': Gerard Butler reveals the real reason behind his stretch in rehab. Actor Gerard Butler has revealed his rehab agony and set the record straight over rumours of his alcoholism. The 42-year-old Scot checked into the Betty Ford Centre in February for three weeks after being injured in a surfing accident. He said: 'Maybe a stronger person wouldn't have needed to go. But I'm glad I did it.
Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).
why does a neap tide occur during this time? that is when the pull of gravity from the moon is at a 90 degree angle with the pull of gravity from the sun What is different between high tide and low during a spring tide vs. a neap tide? great difference between high tide and low tide during a spring tide than a neap tide Why does this difference occur? The combined forces of a the Moon's gravity and the Sun's gravity in a line produces tides with the greatest difference between consecutive low and high tides during a spring tide. During a neap tide the opposing forces of the Sun's gravity and the Moon's gravity at a 90 degree angle produces tides with the least difference between consecutive low and high tides.