Aparallel helical gearset consists of a 19-tooth pinion driving a 57-tooth gear. the pinion has a left-hand helix angle of 30, a normal pressure angle of 20, and a normal module of 2.5 mm. find: (a) the normal, transverse, and axial circular pitches (b) the transverse diametral pitch and the transverse pressure angle (c) the addendum, dedendum, and pitch diameter of each gear

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.

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.