A three-story school has interior column bays that are spaced 25 ft apart in both directions. If the loading on the flat roof is estimated to be 20 lb/ft2, determine the reduced live load supported by a typical interior column at ground level.

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?