chapt1 probl22

# Physics: Principles with Applications

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Unformatted text preview: Solution: (a) Since there are 60 s/minute, and 60 minutes/hour, and 24 hr/day, and 365.25 day/year, the distance light travels in a year is 2.98 108 m/s 60.0s/min 60.0min/hr 24.0hr/dy 365.25dy/yr 1.00yr = 9.40 1015 m. (b) Now, 1.0 AU = 1.50 108 km, or 1.0iAU = 1.50 108 km 1.000 103 m/km = 1.50 1011 m. Thus, a light-year is 9.40 1015 m 1.0AU = 6.27 105 AU. 1.50 1011 m (c) Thus, light goes 6.27 105 AU/year. Converting this to AU/hr we get 6.27 105 AU/yr 1yr 1day = 7.15 AU/hr. 365.25 day 24hr ...
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