Question

A copper wire 3 mm in diameter is found about the cylinder whose height is 1.2 M and diameter is 10 cm so as to cover the arrived surface of cylinder find the length and mass of wire assuming the density of copper wire to be 8.8 gram per centimetre​

Answer 1

Curved surface area of the cyclinder=2πrh=2×3.14×5×12 cm^2 =120×3.14 cm^2

width of wire=3mm=3/10 cm

area of wire =l×3/10cm ^2

l×3/10=120×3.14

l=1203.14×10/3 cm =12560 cm

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