The cost of 11 1/9 m of copper wire is Rs 1000. What is the cost of the wire per cm? (from my book answer list the answer is 90paise please explain the question)
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From the figure we can observed that 1 round of wire will cover 3 mm height of cylinder.
Number of rounds = Diameter of wireHeight of cylinder
=0.312=40 rounds.
Length of wire required in 1 round = Circumference of base of cylinder
=2πr=2π5=10π
Length of wire in 40 rounds =40×10π
=7400×22=78800=1257.14 cm
=12.57 m
Radius of wire = 20.3=0.15 cm.
Volume of wire = Area of cross-section of wire x Length of wire
=π(0.15)2×1257.14
=88.898 cm3
Mass = Volume x Density
=88.898×8.88
=789.41 gm
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