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Space.
Title: Space.
Category: Science & Technology / Physics
Details: Words: 2157 | Pages: 9.2 (approximately 235 words/page)
Space.
Projectile Motion
*Object, moving in gravitational field, with gravity only force acting on it - moves in a parabolic shape
*Measured in two independent dimensions
oVertical - gravity effects
oHorizontal - remains constant though-out motion
*Galileo - formulas for projectile motion
oS = UT - Horizontal motion
oS = UT + ½ AT2 - Vertical motion
Galileo analysis of Projectile motion
*Trajectory of projectile makes a parabolic shape
*Led him to consider reference frames
*Opponent believed in idea of geocentrism - stone would be left behind …showed first 75 words of 2157 total…
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…showed last 75 words of 2157 total…surface at life time of 2.2us but found - lifetime is dilated to 49.2us
Implications of time dilation and length contraction for space travel
*Travellers will age more slowly to stationary observer
*Time dilation - possible to travel to stars in one lifetime
oHowever travelling at 0.999c - take 4.47 yrs to reach closest star; on return it will be 200 yrs later on earth
*If speeds can be reached in excess of c (300c) possible to travel into past
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