Concept and Importance of Reynold's Number, and Practice Calculating It. Concept of Pressures, both static and dynamic pressure.

Table I contains data for a larval tunicate and a shortfin Mako shark swimming in sea water at 15°C. Use these data in the following problems:

Tunicate shark cruise shark burst
Animals length 2 mm 4 meters 4 meters
Swim speed 10 mm s-1 70 km hr-1 144 km hr-1
dynamic viscosity 15°C 1.1375 mPa s
kinematic viscosity 15°C 1.1386 mm2 sec-1
density sea water 15 °C 1.025kg L-1

A. (1pt) Calculate the Reynolds numbers for the tunicate, the shark while cruising, and the shark during burst swimming. Show your work. Will inertial or viscous forces dominate the swimming behavior in each case?

B. (1pt) Is the flow likely to be laminar or turbulent in each situation?

Ashielded metal arc-welding operation is accomplished in a work cell by a fitter and a welder. the fitter takes 5.5 min to load components into the welding fixture at the beginning of the work cycle, and 1.5 min to unload the completed weldment at the end of the cycle. the total ength of the weld seams 1200 mm, and the travel speed used by the welder averages 300 mm/min. every 600 mm of seam length, the welding stick must be changed, which takes 0.8 min. while the fitter is working, the welder is idle (resting): and while the welder is working the fitter is idle. (a) determine the average arc-on time as a fraction of the work cycle time. (b) how much improvement in arc-on time would result if the welder used flux-cored arc welding (manually operated), given that the spool of weld wire must be changed every 10 weldments, and it takes the welder 5.0 min to accomplish the change? (c) what are the production rates for these two cases (weldments completed per hour)? attach your work and solutions.