Let consider three cylindrical aluminum beams in compression, each 5 m long. The foremost is a solid rod having a diameter of 10 mm, the second is a solid rod having a diameter of 6 mm, and the third is a hollow pipe having the outer diameter of 10 mm and a wall thickness of 2 mm. For each of the beam, determine:
i) Its mass
ii) The highest force which the beam will withstand before failing
iii) The ratio of greatest force over the mass