Arailcar barge (rectangular) is 52 m long, 9 m wide, and it floats in fresh water at 2.4 m draft even keel, with kg 2.3m. what will be the change in draft at each end of this barge if a 25,000 kg railcar (already on board) is rolled from one end to the other, a distance of 41 m traveled by the railcar's center of mass?

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?