3. On a very rainy day, Nick drags a box of old books to the bookstore to sell. The box moves through the puddles at U = 10 ft/min. For all calculations use an approximation that the box follows the figure. Calculate the force required to keep the box moving at U. Hints: obtain drag coefficient by calculating the Reynolds number, consider the projected area as the bottom plus the two long sides. • Determine the power (in watt) required to overcome the skin friction drag B=2ft L=3 ft Water line D = 2 in
3. On a very rainy day, Nick drags a box of old books to the bookstore to sell. The box moves through the puddles at U = 10 ft/min. For all calculations use an approximation that the box follows the figure. Calculate the force required to keep the box moving at U. Hints: obtain drag coefficient by calculating the Reynolds number, consider the projected area as the bottom plus the two long sides. • Determine the power (in watt) required to overcome the skin friction drag B=2ft L=3 ft Water line D = 2 in
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Transcribed Image Text:3. On a very rainy day, Nick drags a box of old books to the
bookstore to sell. The box moves through the puddles at U
= 10 ft/min. For all calculations use an approximation that
the box follows the figure.
Calculate the force required to keep the box moving
at U.
Hints: obtain drag coefficient by calculating the Reynolds
number; consider the projected area as the bottom plus the two
long sides.
• Determine the power (in watt) required to overcome the skin friction drag
B = 2 ft
L=3 ft
-Water line
D = 2 in
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