A 25 kg box is at rest on top of a spring with spring constant k = 1000 N/m. The spring is attached to the bottom of an elevator car, as shown in the figure below. i) With the elevator car at rest, fi

### The viscosity of a fluid is to be measured by a viscometer constructed of two 5 ft-long concentric cylinders. The inner diameter of the outer cylinder is 6

The viscosity of a fluid is to be measured by a viscometer constructed of two 5 ft-long concentric cylinders. The inner diameter of the outer cylinder is 6 inches. The gap between the two cylinders is 0.035 inch. and the gap is filled with fluid. The outer cylinder rotates at 250 rpm,