Question

How many nanoseconds are there in 1.00 yr ?  (It needs to be shown using only 3 significant figures.  I came up with 1.89 x 10^9.   However it doesn't seem right.)..........Please disregard...I figured it out...I made a simple calculation error.  The answer is 3.16x10^16

Answer 1

(1 year) x (365.24 day/year) x (86,400 sec/day) x (10⁹ nanosec/sec) =

  (1 x 365.24 x 86,400 x10⁹)  nanosec/year =  3.156 x10¹⁶  (rounded)

                                                                         3.16 x 10¹⁶  (rounded more)

(Note:  1.89 x 10⁹ nanoseconds  =  1.89 seconds.  Not quite a year.)