AME 101 Fall 2006
Problem Set #5
Assigned: Friday, 11/9/2007
Due: Friday, 11/16/2007, 4:30 pm, in my mailbox (OHE 430J)
As always, no late homework is accepted for credit
(you may turn in late homework, however, if you just
want it graded.)
Problem #1 (20 points)
a)
Howard and Samantha go skydiving. Howard weighs 175 lbf with all his gear, and has a cross
sectional area when free falling of 8 ft
2
. If Howard’s terminal velocity is 150 miles per hour,
what is his drag coefficient?
b)
Samantha has an unusual skydiving style. She freefalls lying perfectly straight horizontally, and
her shape can be treated as roughly that of a cylinder 5 ft long and 2 ft in diameter. She weighs
125 lbf with all her gear. Assuming that her drag coefficient can be modeled as that of a circular
cylinder, what is her terminal velocity? To do this problem you will have to
1)
Guess a terminal velocity
2)
Compute her Reynolds number
3)
Look up her drag coefficient in Figure 14
4)
Computer her drag force
5)
Does her drag force equal her weight? If not, adjust your guess of terminal velocity and
go back to step 2.
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 Fall '07
 Ronney
 Fluid Dynamics, Aerodynamics, Drag force, terminal velocity

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