sammie
  • sammie
astronomers use a light year to measure distance. light year is distance light travels in a year. speed of light is 300,000 km/sec. How long is 1 light year in kilometers?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
all right, looks like you need to figure out how many seconds are in a year
anonymous
  • anonymous
so, 60 seconds in 1 minute, 60 minutes in 1 hour, 24 hours in 1 day, ~365 days in 1 year...
anonymous
  • anonymous
60*60*24*365

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anonymous
  • anonymous
is how many seconds there, now if light travels 300,000km in 1 second, then light will travel x km in 60*60*24*365 seconds
sammie
  • sammie
thanks for your help!
sammie
  • sammie
on that on do i need to multiply the seconds part by 300,000?
anonymous
  • anonymous
so you have 300,000km/sec * x sec to obtain only km
anonymous
  • anonymous
so yes
sammie
  • sammie
then that will give me my km?
sammie
  • sammie
I have another question too. using the last question, the nearest star to the earth is 4.34 light years from earth. how far is that in km?
anonymous
  • anonymous
ok so you know how many km are in 1 light year
anonymous
  • anonymous
you just found that with 300,000 * (60*60*24*365)
anonymous
  • anonymous
so you a found value with km/light year
anonymous
  • anonymous
so you can multiply a value like (x light years) * ( y km/light year ) and obtain only km, the units, light years, cancel out
sammie
  • sammie
okay i think i finally am starting to get it
anonymous
  • anonymous
nice

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