NATS 1745 Lecture Notes - Lecture 8: Inverse-Square Law, Tide, Chromatic Aberration
17 Jul 2017
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Gravitational attraction is universal; it"s the cause of motion both on earth and in space. Gravitational attraction increase with proximity to its source. Chromatic aberration is the failure of a lens to focus all colours in a light ray at the same point. Inverse square law means that if you move twice as far from the sun, then the force diminishes to one- quarter. Halley and the royal society offered a prize to anyone who could prove that gravity is defined by the inverse-square law. Halley urged and funded newton to publish his proof. By applying kepler"s 3rd law to the orbits of the moons of jupiter and saturn, he calculated the planets" masses. Describe (briefly) the effect that this source of gravity has on earth"s oceans to create the high tide. They occur when the earth, the sun, and the moon are in a line. The gravitational forces of the moon and the sun both contribute to the tides.
