PLEASE SHOW TO THREE SIGNIFICANT FIGURES: 1. Convert 0.390 km into feet, using t

Question

PLEASE SHOW TO THREE SIGNIFICANT FIGURES:

1. Convert 0.390 km into feet, using the fact that one km equals 0.621 mile and one mile equals 5280 feet. (Enter your answer to three significant figures.) feet

2. Convert 0.390 g into grains, using the fact that one ounce equals 28.35 g and one ounce equals 437.5 grains. (Enter your answer to three significant figures.) grains

3. Convert 3.9 X 10 to the 7th power kg into tons, using the fact that there are 2.205 pounds in one kilogram and 2000 pounds in a ton. (Enter your answer to two significant figures.)

Explanation / Answer

1]

1 KM = 0.621 mile

0.39 KM = 0.242 mile

1 mile = 5280 feet

0.242 mile = 1277.76 feet

2]

1 ounce = 28.35 gms

0.39 gms = 0.39 / 28.35 = 0.0137 ounces

1 ounce = 437.5 grains

0.0137 ounces = 0.0137*437.5 = 5.993 grains

3]

1Kg = 2.205 pounds

3.9*10^7 Kg = 85995000 pounds

2000 pounds = 1 ton

85995000 pounds = 85995000 pounds / 2000 pounds = 42997.5 tons

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