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21 July, 11:11

A copper wire (density=8.96g/cm3) has a diameter of 0.25 mm. if a sample of this copper wire has a mass of 22g, how long is the wire?

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  1. 21 July, 11:24
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    8.96g/1 cm^3=8.96g/10mm^3=0.896g/mm^3

    0.896g/1 mm^3

    22/8.96=2.4553 cm^3

    22/0.896=24.55357143mm^3

    (pi) (r^2) (length)

    (pi) (0.125) (x) = 24.55357143

    =62.52515621 mm long, or 6.252515621 cm long
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