Why might peck drilling be used instead of standard drilling with a 0.25" diameter hole which is 3 inches deep on a aluminum part? a. to save time b. to reduce temperature and tool wear of the bit c. to keep the flutes fully engaged at all times and increase chip length

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?