The velocity of a particle is v={2i+(6−2t)j} m/s, where t is in seconds.
part a) if r = 0 when t = 0, determine the displacement of the particle during the time interval t = 2 s to t = 4 s .

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.