Question

9. 66 cm of silver is drawn into a wire 1 mm in
diameter. What is the length of wire in metres?and curved surface area​

Answer 1

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Volume of silver = 66 cubic cm

Diameter of wire = 1mm = 0.1 cm

Radius of wire = \frac{0.1}{2}=0.05 cm20.1=0.05cm

Since wire is in the shape of cylinder

So, volume of wire = \pi r^2 hπr2h

                               = \frac{22}{7} (0.05)^2 h722(0.05)2h

Since silver is drawn into wire so volume of silver is equal to the volume of wire .

So, \frac{22}{7} (0.05)^2 h= 66722(0.05)2h=66

(0.05)^2 h= 21(0.05)2h=21

h= \frac{21}{0.0025}h=0.002521

h= 8400h=8400

Length of wire = 8400 cm =84 m

Hence the length of wire is 84 m .

Answer 2

Answer:

Volume of silver = 66 cubic cm

Diameter of wire = 1mm = 0.1 cm

Radius of wire = \frac{0.1}{2}=0.05 cm20.1=0.05cm

Since wire is in the shape of cylinder

So, volume of wire = \pi r^2 hπr2h

= \frac{22}{7} (0.05)^2 h722(0.05)2h

Since silver is drawn into wire so volume of silver is equal to the volume of wire .

So, \frac{22}{7} (0.05)^2 h= 66722(0.05)2h=66

(0.05)^2 h= 21(0.05)2h=21

h= \frac{21}{0.0025}h=0.002521

h= 8400h=8400

Length of wire = 8400 cm =84 m

Hence the length of wire is 84 m .

hope it will help you....... . ..m