Acurved hook has a circular cross-section of radius 1-in and is made of 1040cd steel. the distance of the centroidal axis from the axis of curvature is 3-in. a repeated force is applied to the hook which causes the bending moment at a cross-section to vary between 0and 10 kip-in. calculate the safety factor at the inner-most pointon the cross-sectionforinfinitelife. ignore the effect of normal internal reactions due to the load on the hook. a reliability of 50% is required from the estimate of safety factor. assume the surface of the hook is commercially polished.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

On a average work day more than work place firs are reorted

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.