February 18, 2008

# February 18, 2008 - Total lunar eclipse on Wednesday...

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February 18, 2008 Total lunar eclipse on Wednesday doesn’t count for anything for this class though? CH 7.1 In Newton’s version of Kepler’s law (p^2=4pi^2a^3/G(M 1 +M 2 ), why is M 1 +M 2 usually written as just M o Because usually one of the masses is much smaller than the other At exactly the same time that you drop a valuable crystal glass, your housemate throws a bottle horizontally. The bottle lands at the feet of your noisy neighbor. Which smashes first, the glass or the bottle? o They hit at the exact same time o They have the same acceleration goes downward Everything falls at the same rate, not matter if it is thrown out or dropped straight down What keeps an orbiting object in orbit? o Gravity! Since the direction is changing, there must be an acceleration Newton’s first law A constant for pulling inward Centripetal force Why are astronauts weightless in space o There is gravity in space o Weightlessness is due to a constant state of Free-fall

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