Question

Determine the terminal velocity of a 90 kg skydiver. How long will it take to reach that velocity? Typical drag coefficient and the frontal area of skydivers are 0.1 and 0.15 m2 , respectively.

Answer #1

A 60.0-kg and a 90.0-kg skydiver jump from an airplane at an
altitude of 6.00*10^3 , both falling in the pike position. Make
some assumption on their frontal areas and calculate their terminal
velocities. How long will it take for each skydiver to reach the
ground (assuming the time to reach terminal velocity is small)?
Assume all values are accurate to three significant digits. Use
Drag Coefficient 1.21kg/m^3 and frontal Arear of skydiver of
0.140m^2.

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Determine the drag coefficient of a 75kg skydiver with a
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is 0.79. Frontal area is 0.42 m^2. The density of air is 1.1 kg/m^3
at this elevation. The terminal velocity is reached when the drag
force of a free falling object is equal to the weight.
a)Estimate the magnitude of the terminal velocity of the cyclist
after he has ridden his bike off of a cliff. Assume that the
frontal area remains constant during the fall.
b)Estimate...

A 510-g squirrel with a surface area of 905 cm2 falls from a
4.4-m tree to the ground. Estimate its terminal velocity. (Use the
drag coefficient for a horizontal skydiver. Assume that the
squirrel can be approximated as a rectangular prism with
cross-sectional area of width 11.4 cm and length 22.8 cm. Note, the
squirrel may not reach terminal velocity by the time it hits the
ground. Give the squirrel's terminal velocity, not it's velocity as
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Forces that are dependent on VELOCITY are DRAG FORCES. These
forces are due to the reaction of the medium to the motion of the
object. There are two sorts of these: LINEAR, or VISCOUS drag,
models forces proportional to the velocity of the object and occurs
in DIFFUSE media at SLOW speeds, and QUADRATIC, or TURBULENT, drag
models forces proportional to the square of the velocity and occur
in DENSE media or at HIGH speeds.
1. A ball with a...

John was swimming in the river. His swimming velocity was 0.7
m/s due east. The water was running at 0.1 m/s due west. John’s
projected area in the water was 0.45 m2 . Water density was 1000
kg/m3 . The coefficient of drag was 0.2.
(a) What was John’s velocity relative to the water?
(b) What was the pressure drag force from the water?
After a little while, John turned around and now is swimming at
0.7 m/s due west....

1. A 25 kg skydiver has a speed of 20 m/s at an altitude of 350
m above the ground. Determine the kinetic energy possessed by the
skydiver.
2. If a cruise ship travels 150 km to the south and then 250 km to
the west, what is the ship’s displacement from its starting
point?
3. A train is accelerating at a rate of 5 m/s . If its initial
velocity is 15 m/s, what is its speed after 10...

A hemispherical parachute made of an air-impervious material is
8.0(m) in diameter. The mass of the parachute and load combined is
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area facing flow and the viscosity of air is
1.8x10-5(PI).
a. How fast will the parachute descend in still air assuming
pressure drag dominates?
b. Calculate the Reynolds number based on these two calculations
and determine whether pressure drag or viscous drag dominates.
c. How far would an...

How long will it take $2000 to reach $6600 when it
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