Question on unit!!!Thx!!!

2012-12-03 12:25 am

Starting with the definition 1 in. = 2.54 cm, find the number of

a) kilometers in 1.00 mile

b) feet in 1.00 km

Please show the steps.

Thank you very much!!!

回答 (1)

micatkie

2012-12-03 1:33 am

✔ 最佳答案

a)
1 in = 2.54 cm
1 x (1/12) ft = 2.54 x (1/100) m
1 x (1/12) x (1/5280) miles = 2.54 x (1/100) x (1/1000) km
1 mile = 2.54 x (1/100) x (1/1000) x 12 x 5280 km
1 mile = 1.61 km (to 3 sig. fig.)

b)
1 in = 2.54 cm
1 x (1/12) ft = 2.54 x (1/100) m
1 x (1/12) ft = 2.54 x (1/100) x (1/1000) km
1 km = 1 x (1/12) x (1/2.54) x 100 x 1000 ft
1 km = 3280 ft (to 3 sig. fig.)

2012-12-02 17:34:32 補充：
To avoid calculations, you may use the following webpage :
http://www.onlineconversion.com/length_common.htm

參考: micatkie, micatkie

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