Question

To make a rod of length 90 cm and diameter 1.4 cm, then iron required for it is ______​

Answer 1

Answer:

Given: For cylindrical rod: length of rod (h) = 90 cm, and diameter (d) = 1.4 cm To find: Iron required to make a rod diameter (d) = 1.4 cm ∴ radius (r) = d/2 = 1.4/2 = 0.7 cm Volume of rod = πr2h = (22/7) x 0.7 x 0.7 x 90 = 22 x 0.1 x 0.7 x 90 = 138.60 cc ∴ 138.60 cc of iron is required to make the rodRead more on Sarthaks.com - https://www.sarthaks.com/856617/how-much-iron-is-needed-to-make-a-rod-of-length-90-cm-and-diameter-1-4-cm