Use Dimensional Analysis to solve the following problems. a.) How many seconds old are you? (Express with 2 sig figs in scientific notation.)

Question

I am 13 years old and my birthday is July 28,2004

Answer 1

From July 28, 2004 until today, October 11, 2017 is 13 years + 64 days.

Using 365 days in a year as a standard, that would be 365 days/yr x 13 yrs = 4745 days + 64 days = 4809 days.

Using 24 hours in a day, and 60 minutes in an hour and 60 seconds in a minute...

(4809 days)(24 hrs/day)(60 min/hr)(60 sec/min) = 415,497,600 seconds

Putting this in scientific notation, you get 4.15....x10⁸ seconds

And rounding to 2 significant figures you get 4.2x10⁸ seconds