In a turning operation on stainless steel with hardness = 200 hb, the cutting speed = 200 m/min, feed = 0.25 mm/rev, and depth of cut = 7.5 mm. how much power will the lathe draw in performing this operation if its mechanical efficiency = 90%. use standard tables to obtain the appropriate specific energy value.

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?