Estimate the drag on one side of a 12-ft-long, 51-ft-wide flat plate if atmospheric air at 60°F is flowing with a velocity of 20 ft/sec. Assume that:
(a) Re _{\text {crit }}=3 \times 10^{5}
(b) Re _{\text {crit }}=5 \times 10^{5}
(c) Re _{\text {crit }}=6 \times 10^{5}