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प्रश्न
Find the length of 13.2 kg of copper wire of diameter 4 mm, when 1 cubic cm of copper weighs 8.4 gm.
उत्तर
Density of copper = Weight/Volume = 8.4 gram/1 cm3 = 8.4 gram/cm3
Volume = Weight/Density = 13.2 kg x 1000 gram/kg/8.4 gram/cm3 = 1571.43 cm3
`"L"="V"/(pi r^2)=(1571.43"cm"^3)/(22/7xx(0.2"cm")^2= 12500.01`cm = 125 m
Thus, length of 13.2 kg of copper is 125 m.
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