need a solution

Asked by  | 20th Jan, 2009, 08:41: PM

Expert Answer:

The wire has weight 13.2 Kg=13200 gm

Now from the weight we can find the volume of the wire as   it's given that when copper weighs 8.4 gm its vol is 1

 So when copper weighs 13200 gm, its volume =(13200/8.4) ( 11000/7)

Now, let the length of the copper wire be l cm

We know that the shape wire is like the shape of a right circular cylinder.Let the radius of the wire =r.

So according to question , r=diameter/2=2 mm =2/10 cm

So volume of the wire ==(22/7)*(2/10)*(2/10)*(l).

Thus ,

 we have the equation,

(22/7)*(2/10)*(2/10)*(l)= (11000/7)

Solving we get

l=12500 cm


Answered by  | 21st Jan, 2009, 11:45: AM

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