Question

40. A sphere of diameter 6 cm is dissolved and converted into a wire of radius 0.2cm. t length of wire is a) 6 cm b) 700 cm C) 900cm d) 450 cm​

Answer 1

Answer:

900 cm

given,R of sphere=6/2=3cm ;r of wire=0.2cm

Let length of wire be h

volume of sphere=4/3πr^3=36π

volume of sphere =volume of wire

36π=πR^2h

36=0.2×0.2×h

36/(0.2×0.2)=h

900=h

hence,length of wire=900cm