Question

Alpha Centaun is 4.3 light years from earth. Express distance (in kilometers) in scientific notation. ( A light year is about 9.5 x 10^12 km)

Answer 1

To answer this question, first change 4.3 years to seconds. 4.3 years x 365 days per year x 24 hours per day x 60 minutes per hour x 60 seconds per minute = 135,604,800 seconds.

Then I would convert 3.00 x 108 m/s to km/s by dividing by 1000. This will equal 300,000 km/s.

Then multiply speed times time to determine distance.

135,604,800 seconds x 300,000 km/s = 4.07 x 1013 km.

Answer 2

Answer:

4.275 x $10^{13}$km

Explanation:

As 1 light year = 9.5 x $10^{12}$ km

and Alpha Centaur is 4.3 light years away the distance = 4.3 x 1 light year =

42.75 x $10^{12}$km = 4.275 x $10^{13}$km

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