The thickness of a metallic tube is 1cm.and the inner diameter of the tube is 12cm. find the weight of 1m long tube. if the density of the metal is 7.8cm/cm cube?
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t =1cm R-r =1 R - 6 = 1 R= 7 volume = πh (R2 - r2) weight = 3.82668 [ hint] π = 3.14
vinitha3559:
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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
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