If the modulus of rigidity of a material is R and its modulus of elasticity is E, what will be the value of the ratio RE when Poisson's ratio is 0.05?

A 40 cm long and 10 cm diameter brass cylinder was subjected to a tensile load of 50,000 N. The resulting increase in length and decrease in diameter were noted to be 0.8 mm and 0.05 mm respectively. Find the Poisson's ratio of brass.

A shaft of 60 mm diameter subjected to torsion has a shear strain of 0.0006 at the outer surface. The rate of twist will be equal to: