(1) The age of the universe is thought to be somewhere around 10 billion years. Assuming one significant figure, write this in powers of ten in (a) years, (b) seconds:

Age  =  10×109 yr  =  1×1010 yr

(1)

Age  =  1×1010yr×(365 d/1 yr)×(24 hr/1 d)×(3600 s/1 hr)  =  3×1017 s

(2)

(3) See page 1068 of the text.
(5) uncertainty  =  (0.25/2.26)×100  =  11%
(7) (a) .5/5  =  10%, (b) .5/50  =  1%, (c) .5/(5×60)  =  0.2%
(13) See page 1068 of the text.
(15) 6 ft 2 in  =  74 in ×1 m/39.37 in  =  1.9 m
(23) See page 1068 of the text.

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On 22 Aug 1999, 16:24.