Drag Force and Terminal Velocity Problems Fishbane Chp 5
The maximum acceleration is achieved when there is no drag (low speed)
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The maximum acceleration is achieved when there is no drag (low speed).
Thus
F
engine
=
ma
= (800 kg)(4.8 m/s
2
) = 3.8
10
3
N.
At
a top speed of
v
max
= 90 m/s,
the acceleration is zero and
so
C
D
= 2
F
engine
/
Av
2
= 2 (3.8
10
3
N)/(1.25 kg/m
3
)(1.8 m
2
)(90 m/s)
2
=
0.42
.
P44. Assume that the drag force on a parachute is given by Eq. (5–30) in the text. The
effective
area of the parachute is
and the density of air is
If a 90-
kg parachutist finds
that his terminal speed is
what is the drag coefficient?
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drag force
so
If a 90-
what is the drag coefficient?