Amultiple disk clutch, steel on bronze, is to transmit 4.5 hp at 710 rpm. the inner radius of contact is 1.0 in, and the outer radius of contact is 2.6 in. the clutch operates in oil with an expected coefficient of friction 0.125. the average allowable pressure is 47 psi, maximum. assuming uniform wear, determine the followings: a. how many total disks of steel and bronze are required? b. what axial force is required? c. what is the average pressure? d. what is the actual maximum pressure?

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

What precautions should you take to prevent injuries when dealing with heavy loads?

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.