Question

Aaj solid iron rectangular block of dimensions 4.4 into 2.6 into 1 metre cube is cast into a hollow cylindrical pipe of internal radius 30 cm and thickness 5 cm find the length of pipe

Answer 1

Internal radius, r = 30 cm

Thickness, w = 5 cm

External radius, R = 30 + 5 = 35 cm

Here volume of cuboid = volume of hollow cylinder 440 × 260 ×100 = π(R2 – r2)h

⇒ 440 × 260 × 100 = π(352 – 302)h ⇒ 440 × 260 × 100 = π(325)h

∴ h = 11200 cm = 112 m