Question

The thickness of a metallic tube is 1cm and its outer radius is 11cm. Find it's mass of such 1m long cube if the density is 7.5 g/cm3​

Answer 1

Answer:

31.868 kg.

Step-by-step explanation:

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 = 7.8 g

Weight of tube = 7.8 g × 4085.71 = 31868.538 g = 31.868 kg.

Hope it helps

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