Jack & Jill went up the hill to fetch a pail of water. At the well, Jill used a force of 7lbs to turn the crank handle with a radius of 1 foot to rotate the axle with a radius of 1 inch, so she could raise the 40lb bucket of water. C) What is the efficiency of the system?

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?