Question

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

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

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