CHEM 222 Lecture Notes - Law And Justice, Geochemistry, Spinning Wheel

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Planets rotate on their own axes (as do the moons of the planets) Partly due to the seasonal movement of mass over the earth (seasonal wobble) The moon librates (swings back and forth) as it orbits the earth. Venus, uranus, and pluto are inclined more than 90 to their orbital plane. Pluto and uranus rotate with their axes lying almost in their orbital plane. Venus has highest inclination angle (it rotates backwards in relation to its revolution about the sun. A rotating body tends to stay in rotation unless acted upon by an external torque. ) = the quality and quantity which determines the continuing tendency to rotates. ) = in radians, determines the number of turns per unit time (rad/s) The properties inherent to the wheel are assembled as the moment of inertia (its inertia with respect to rotational motion) of the wheel: The angular momentum of the spinning wheel is: