Question

What length of solid cylinder 2 cm in diameter must
be taken to be cast into a hollow cylinder of external
diameter 12 cm, 0.25 cm thick, 15 cm long?​

Answer 1

Answer:

Volume of solid cylinder=Volume of hollow cylinder

⇒πr 2h=π((6) −(6−0.25) 2 )×15

⇒(1) 2×h=(36−33.0625)×15

h=44.0625

∴Length of solid cylinder=440.625cm