Alift up system is used to transport objects among different floors. the two bearings on both ends of the shaft have the same dimension (l = 1 inch and diameter d = 2 inch), and they are made of steel-backed, ptfe coated bronze. the load bearing statistics are as follows: pmax = 36,000 psi; vmax = 390 ft/min; (pv)max = 51,000 lb-ft/in2-min. a cable is located at the midpoint of the shaft that is used to lift the chamber. the radius of the drum on the shaft is 6 inches. if the speed of the lifting chamber is 18 in/s, find the maximum load this lifting system can support.

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.

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86