Question

Calculate the speed a spherical rain drop would achieve falling from 4.2 km (a) in the absence of air drag (b) with air drag. Take the size across of the drop to be 4.2 mm, the density to be 1.00×103??/?3 , and the surface area to be ??2 . Additionaly: the density of air is 1.21??/?3 , and the drag coefficient for the spherical drop is 0.45.

a) In the absence of air drag

b) with air drag

Answer #1

Calculate the speed (in m/s) a spherical rain drop would achieve
falling from 4.10 km in the absence of air drag and with air drag.
Take the size across of the drop to be 5 mm, the density to be 1.00
? 103 kg/m3, and the surface area to be
?r2. (Assume the density of air is
1.21 kg/m3.)
(a)in the absence of air drag.
(b) with air drag.

Calculate the speed (in m/s) a spherical rain drop would achieve
falling from 2.10 km in the absence of air drag and with air drag.
Take the size across of the drop to be 9 mm, the density to be 1.00
✕ 103 kg/m3, and the surface area to be
πr2. (Assume the density of air is
1.21 kg/m3.)
(a)
in the absence of air drag
202.985 m/s (correct)
(b)
with air drag
9.8687 m/s (incorrect)

Calculate the velocity a spherical rain drop would achieve
falling (taking downward as positive) from 4.2 km in the following
situations.
h = 4.2 km
l = 4.8 mm
d = 1.23 kg/m3
a Calculate the velocity in the absence of air drag
in m/s.
b Calculate the velocity with air drag in m/s. Take
the size across of the drop to be 4.8 mm, the density of air to be
1.23 kg/m3, the density of water to be 1000
kg/m3,...

A spherical raindrop 3.1 mm in diameter falls through a vertical
distance of 3550 m. Take the cross-sectional area of a raindrop =
πr2, drag coefficient = 0.45, density
of water to be 1000 kg/m3,and density of air to be 1.2
kg/m3.
(a) Calculate the speed a spherical raindrop would achieve
falling from 3550 m in the absence of air drag.
(b) What would its speed be at the end of 3550 m when there is
air drag?

To maintain a constant speed, the force provided by a car’s
engine must equal the drag force plus the force of friction of the
road (the rolling resistance). Assume that the drag coefficient for
a Toyota Camry is 0.28, while for a Hummer it is 0.64. The density
of air at this temperature is 1.21 kg/m3.
s1 = 62 km/h
s2 = 110 km/h
A) What is the drag force at 62 km/h for a Toyota
Camry? (Drag area is...

a) SCSU physics and astronomy student club has a recently
established tradition of pumpkin drop, from the top of Wick Science
Building to the "moat" below street level. Although the
"experimental data" has not been made public, there have been
rumors of the drop took 2.12 seconds, i.e. falling from rest with
negligible air drag. Based on the rumor, how tall is the building
from the "moat" to the roof? Ignore air drag or any rotation of
pumpkins. Hint: You...

1. Physics and astronomy student club has a recently established
tradition of pumpkin drop, from the top of Wick Science Building to
the "moat" below street level. Although the "experimental data"
have not been made public, there have been rumors of the drop took
2.07 seconds, i.e. falling from rest with negligible air drag.
Based on the rumor, how tall is the building from the "moat" to the
roof?
Ignore air drag or any rotation of pumpkins.
Hint: You may...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

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