Question

the thickness of the metallic tube is 1 centimetre and inner diameter of the tube is 12 cm find the weight of 1 M long tube if the density of the metal be 7.8 gram per centimetre cube

Answer 1

Answer:

Step-by-step explanation:

Density = mass/volume

----------=volume=area×thickness

Mass= density×area×thickness

Area of cylinder= 2pi×radius×length of tube

Mass=7.8×2×3.14×6×100×1

Mass=9360gm

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 = 7.8 g × 4085.71

                         = 31868.538 g

                         = 31.868 kg