A horizontal curve is to be designed for a section of a highway having a design speed of 50 mi/h. a. If the physical conditions restrict the radius of the curve to 400 ft, what value is required for the super elevation at this curve?
b. Is this a good design?

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?