Question

tha radius of a solid sphere is 9 cm .it is melted and drawn into a wire of diameter 2mm.tha length of tha wire?

Answer 1

Volume of Sphere = 4/3*π*r²
                              = 4/3*π*81
                              = 27*4π
                              = 108π 

Volume of wire = π(0.2)²*h

 But Volume Remains same

So, 108π = π*0.04*h
    so, 108/0.04 = h = 2700 cm