An aluminum alloy that has been solutionized at 500°c and quenched rapidly to room temperature and immediately aged at 120oc that the precipitation rate is several orders of magnitude faster than the same aluminum alloy that has been solutionized and quenched from 500°c, held at room temperature for a month, and then aged at 120oc. explain this behavior

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?