Stereolithography is to be used to build the part in Figure below. Dimensions of the part are shown in detail. The laser beam diameter = 0.175mm, and the beam can be moved across the surface of the photopolymer at = 600mm/s. Layer thickness = 0.15mm. Compute an estimate of the time required to build the part, if 8s are lost each layer to lower the height of the platform that holds the part. Neglect post-curing time.

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?