The cable of hoist has a cross sectional of 80mm2.The hoist is used to lift a crate weighining 500 kg.The free length of of the cable is 30 m.Assume all deformation is elastic. (a) what is the stress on the cable. (b) How much will the cable extend if it is made from steel(E-200 Gpa)? (c) How much will the cable extend if it is made from polypropylene(E-1.2 Gpa)?

A steel [E = 200 GPa] rod with a circular cross section is 9-m long. Determine the minimum diameter D required if the rod must transmit a tensile force of 21 kN without stretching more than 4 mm.

A disk of SBR elastomer 3.0 cm in diameter 0.5 cmthick is used as a cushioning surface between two steel rods ofthe same diameter, as shown below (not to scale). a. If the rods are brought together with an axial force of 100 N such that the SBR is compressed elastically between them, what is the thickness of the SBR under load? b. Under the same conditions as part (a), what is the greatest possible diameter of the SBR under load? c. If the SBR is bonded to the rods, how far can one rod be rotated with respect to the other before the SBR/rod interface fractures? Assume that the rods are essentially rigid and the distance between them remains constant. Please answer in degrees of rotation.

When a tensile load of 20kN is applied to a rod of length 5 cm changes its length by 1 mm. The strain on the rod is ?

Compute the ultimate strength for a  composite which uses Aramid fibers and Polyester matrix. The volume fraction of fibers is 45 % and matrix is 55 %. Note- use chart in image

When a tensile force is applied to a material, the maximum stress that material can take before it is broken is 15 MPa. The same material’s modulus of elasticity is 4000 GPa a) If the original diameter of the material is 2cm, calculate the maximum load that the material can hold. b) If the initial length of the specimen is 15 cm, calculate the maximum length of the material before it is broken.