Ch 3-4 - Gravitation and Orbits Here are some useful...

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Gravitation and Orbits Here are some useful constants. R is radius, and r is the distance between two objects. M earth = 6.0 × 10 24 kg M moon = 7.35 × 10 22 kg M sun = 2.0 × 10 30 kg r moon,earth = 3.84 × 10 8 m r sun,earth = 1.5 × 10 11 m R earth = 6.38 × 10 6 m R moon = 1.74 × 10 6 m R sun = 7.0 × 10 8 m 1. Which is larger, the magnitude of the gravitational force of the moon on the Earth or the magnitude of the gravitational force of the Sun on the Earth. (Note: full credit will only be given if you calculate each force and compare them–no guessing allowed!) 2. The magnitude of the gravitational force of the Sun on the Earth is the magnitude of the gravitational force of the Earth on the Sun. (a) greater than (b) less than (c) equal to 3. If the net force on an object is zero for a time interval _t, then (a) the object’s momentum is constant. (b) the object’s momentum is zero. (c) the change in an object’s momentum is positive.

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This note was uploaded on 02/24/2010 for the course PHY 303K taught by Professor Turner during the Fall '08 term at University of Texas at Austin.

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Ch 3-4 - Gravitation and Orbits Here are some useful...

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