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ASTR 100 HW 1

# ASTR 100 HW 1 - Jaclynn Hilligoss Section 0203 Homework#1...

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Jaclynn Hilligoss Section 0203 Homework #1 1.   (a)  i. 83,321,134 = 8.3321134 x 10^7 ii. -370,165,373 = -3.70165373 x 10^8 iii. 0.00541 = 5.41 x 10^-3 iv. -0.00001816 = -1.816 x 10^-5 v. 5410 = 5.41 x 10^3     (b) i. -6.9354 x 10^6 = -6,935,400 ii. 9.388 x 10^2 = 938.8 iii. 2.31 x 10^3 = 2,310 iv. 6.15 x 10^-1 = .615 v. -6.899 x 10^-3 = -0.006899 2.  Speed of Light = 3.0 x 10^8 m/s     (a) Lightbulb 2m from eye T = d/v  T= 2m/ 3.0 x 10^8 m/s              T= 6.67 x 10^-9 secs.     (b) Sun 1.5 x 10^11 from Earth T = d/v  T= 1.5 x 10^11m/ 3.0 x 10^8 m/s              T= 500 seconds or 8.3 minutes 3.  (a) Year->  equivalent to the amount of time the Earth takes to completely orbit around  the sun       (b) Day->  equivalent to the amount of time between one sunrise to the next sunrise.  24 hour period   (c) Rotate->  when something turns or spins about its axis 1

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(d) Planet->
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