Calculate the forging force for the cylindrical workpiece made of 1020 steel that is 90 mm high and 125 mm in diameter and is reduced in height by 40%. Assuming that it is a complex forging and that the projected area of the flash is 30% greater than the projected area of the forged workpiece.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?