Question

A steel rectangular tube has outside dimensions of 150 mm x 50 mm and a wall thickness of 4 mm. State the inside dimensions, the area of its cross section, and the weight of a piece 1.22 m long.

Answer 1

Answer:

 inside dimension  $= 142 mm \times 42 mm$

cross section area $= 7.5\times 10^{-3} m^2$

mass of 1.2 meter log steel  $= 1.843\times 10^{-3} \rho$

Explanation:

given data:

Outside dimension of steel rectangular $= 150 mm\times 50mm$

Thickness = 4 mm

Long = 1.22 m

inside dimension will be $= (150- 8)mm \times ( 50-8)mm$

                                         $= 142 mm \times 42 mm$

cross section area $= 150\times 50 mm^2$

                               $= 7500\times 10^{-6} m^2$

                               $= 7.5\times 10^{-3} m^2$

let the density be assumed as \rho

mass of 1.2 meter log steel will be $= 1.2 \times (7.5\times 10^{-3} - 0.142\times 0.048)\times \rho$

                                                       $= 1.843\times 10^{-3} \rho$