Determine i* per year for the cash flows shown below: Year 0 1 2 3 4

Cash Flow, $ 0 −80,000 9000 70,000 30,000

1.Use excel spreadsheet.

2.Use try and error method.

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?