Question

An unknown object is placed inside of a spherical container and dropped from an airplane. When empty, the spherical container has a mass of 3.00 kg. The container has a drag coefficient of 0.500 and a diameter of 39.2 cm. With the unknown object inside, the container reaches a terminal velocity of 65.2 m/s. What is the mass of the unknown object? Use 1.22 kg/m^3 for the density of air.

Answer #1

A 2.0g latex balloon is filled with 2.0g of helium. When filled,
the balloon is a 28 cm diameter sphere. When released, the balloon
accelerates upward until it reaches a terminal speed. What is this
speed? Assume air density of 1.2 kg/m^3 and a drag coefficient for
sphere of 0.47

Imagine that you are working for a salvage company. An empty
shipping container was accidently dropped by a crane while being
loaded onto a cargo ship. It is now sitting at the bottom of the
harbour, 12 metres below the surface of the water. It needs to be
moved as it is blocking ships from using the wharf.
The shipping container is 6.06 m long, 2.59m high and 2.43 m
wide, has a usable internal volume of 33 cubic metres,...

A skydiver of mass m = 70 kg, which includes the mass of all the
equipment she is wearing (helmet, parachute, etc.), jumps from an
airplane at high altitude. The density of the air is ρ = 1.22 kg/m3
.
(a) Estimate a numerical value for the terminal speed of the
diver while she is in a horizontal spread-eagle formation.
(Parachute is not open.) The drag coefficient of the diver in this
formation is about 1.0. Any other needed quantities...

The mass of a bicyclist and bike is 80 kg. The drag coefficient
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 spherical object (50 cm diameter, c=0.46 kJ/kg*C, k = 42
W/m*C, density = 7800 kg/m3 ) is initially at a uniform temperature
of 450 C. It is suddenly placed in a constant temperature
environment of 100 C. The convection transfer coefficient is 500
W/m2*C. How long would it take for temperature in the center of the
sphere to cool down to 150 C? Note: Bi for a sphere is
(hD)/(6k).Suggestion: First calculate Biot number, then determine
if T is...

1.)The Buoyant Force from a fluid to an object depends on which
of the following factors?
a.)The volume of the object
b.)The volume of the fluid
c.)The density of the fluid
d.)The density of the object
2.)Why did the Titanic sink after it hit an iceberg and water
rushed into the hull through the hole created by the
collision?
a.)The density of water has increased
b.)The density of the boat increased
c.)The mass of the boat has decreased
d.)The volume...

A stone is dropped from the top of a cliff. The splash it makes
when striking the water below is heard 3.2 s later. How high is the
cliff?
2. The pressure variation is a sound wave is given by Δ P =
0.0035 sin (0.38 π x – 1350 π t) Determine a. the wavelength b. the
frequency c. the speed and d. the displacement amplitude of the
wave. Assume the density of the medium to be 2.2 x...

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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