Question

the length of a metallic tube is 1 m,its thickness is 1m and its inner diameter is 12cm. find the weight of the tube if the density of the the metal is 7.7 gram per cubic cm.

Answer 1

the answer of the questions is 21

Answer 2

• inner diameter = 12 cm

Therefore, radius = 6 cm

• Thickness = 1 cm

External radius = thickness + inner radius

=1 + 6 = 7 cm.

• Length of tube = 1 m = 100 cm

Now, volume of tube = π(R² - r²)h

22/7 * (7² - 6²) * 100

22/7 * 13 * 100 = 4085.71 cm³

• Density of metal per cm³ = 7.7 g

Weight of tube = 7.7 g × 4085.71

                         = 31868.538 g

                         = 31.868 kg