標題:
scientitif notation
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發問:
The volume of water in a reservoir is 1.35 km^3. a) Express the volume of water in m^3 and in scientific notation b) IF 2.7 x 10^6 m^3 of water is drained from the reservoir every day, how many days will it take to empty the reservoir?
最佳解答:
a) 1 km = 1000 m = 10^3 m so 1 km^3 = (10^3)^3 m^3 = 10^9 m^3. 1.35 km^3 = 1.35 x 10^9 m^3. b) Number of days = 1.35 x 10^9 / 2.7 x 10^6 = 0.5 x 10^(9 - 6) = 0.5 x 10^3 = 5 x 10^2 days = 500 days.
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