A5-mm thick hollow steel has an allowable stress limited to 200 mpa. determine the inside and outside diameter of the tube if the force applied is 2.0 kn.

Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.