List of top Material Science and Technology Questions on Mechanical Theory

Two thigh bones (femurs) of $10 \ cm^2$ area support a 40 kg body. Average pressure is:

What is the stress developed when a steel rod of radius 10 mm and length 1.0 m is stretched by a 100 kN force?

A load of \(4.0 \, \text{kg}\) is suspended from a ceiling through a steel wire of length \(20 \, \text{m}\) and radius \(2.0 \, \text{mm}\). The length of the wire increases by \(0.031 \, \text{mm}\) at equilibrium. The Young’s modulus of steel is: (Take \(g = 9.81 \, \text{m/s}^2\)):

A load of \(4.0 \, \text{kg}\) is suspended from a ceiling fan through a steel wire of radius \(2.0 \, \text{mm}\). The tensile stress developed in the wire when equilibrium is achieved is: (Take \(g = 9.81 \, \text{m/s}^2\)):

Aluminium alloy after failure has a final length of 2.195 in and a final diameter of 0.398 in at the fractured surface. The percentage of elongation and reduction in area is:

A 1.25 cm diameter bar is subjected to a load of 2500 kg. Calculate the engineering stress on the bar in megapascals (MPa):

A 0.500-inch diameter aluminum bar is subjected to a force of 2500 lb. The engineering stress in pounds per square inch (psi) on the bar is: