For a steel alloy it has been determined that a carburizing heat treatment of 6-h duration will raise the carbon concentration to 0.38 wt% at a point 3.0 mm from the surface. Estimate the time (in h) necessary to achieve the same concentration at a 5.6 mm position for an identical steel and at the same carburizing temperature.

Asimple speed reducer is composed of 2 spur gears. the pinion gear has a pitch diameter of 0.75" and 36 teeth while the driven gear has a pitch diameter of 4.0" and 192 teeth. a)-what is the diametral pitch of each gear? b)-if an electric motor rotating ccw at 3000 rpm is coupled to the pinion, what is the rotational speed of the driven gear? c)-if the torque delivered to the pinion is 1 n-m, what is the torque on the driven gear? d)-what is the power transmitted by the gear train?