Question

the radius of a metallic sphere is 9 cm .it was melted to make a wire of diameter 4mm find the length of wire​

Answer 1

Let the radius of sphere be R and radius of wire be r.

V ( sphere)  = 4/3 × π × r³

V = 4/3 × π × 9 × 9 × 9

V = 972π

d = 4 mm

r =  2 mm or 0.2 cm

v ( wire ) = π × r² × h

v = (0.2)²πh

Volume of cylinder = Volume of wire

972π = 0.04 π h

h = 972 / 0.04

h = 24300 cm