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Question

How do you use dimensional analysis to figure out how many seconds are in 4 years?

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Solution

1minute=60seconds
1hour=60minutes
60seconds×60minutes=3600seconds=1hour
24hours=1day
365.25days=1year (to account for leap years, the likelihood of the extra day out of 4 years is added.)
3600seconds×24hours=86,400seconds
...and finally:
86,400seconds×365.25days×4=126,230,400seconds.

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