Question

a hollow core metallic cylinder whose external radiusis 4.3cm and internal radius is 1.1cm and whole length is 4cm is meltedand recast into a solid cylinder of 12cm long.Find the diameter of solid cylinder​

Answer 1

Answer:

hollow cylindervol: πh (R+r) (R-r)

πx4 (4.3+1.1)(4.3-I.I)

πx4x5.4x3.2cm3

Vol.of cylinder = πr^2h=πxr^2 x 12

.πx4x5.4x3.2= πxr^2 x 12

r^2 = πx4x5.4 x 3.2/πx12=5.76

r =v5.76 = 2.4 cm

diameter = 4.8cm