3. A spur gear shall translate power from a 20kW motor rotating at 600rpm. A reduction ratio of 3 is required. The pinion is manufactured from alloy steel with allowable stress 408MPa, with milled surfaces. It shall have a pitch diameter of 200mm and module 4mm, pressure angle, =20 degrees. a. What are the numbers of teeth on the pinion and the gear? b. What is the tangential velocity? c. What is the required face width, b ? d. What is the radial force between the pinion and the gear