Question

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 of the boat decreased

3.)If the density of saltwater is 1029kg/m^{3}, which of
the following object will float in this saltwater?

a.)A cylinder made of unknown material, but mass 50kg, diameter
0.05m and height of 0.1m

b.)A cylinder with mass 1kg, diameter 0.2m and height of 0.1m

c.)A piece of quartz (quartz density is 2320kg/m^{3}
)

d.)A piece of iron metal (iron density is 7800kg/m^{3}
)

4.)An object with mass 2kg is floating on the surface of water(
density of water is 1kg/m^{3}). If we know the displaced
volume of water from the object is 0.001m^{3}, then the
density of the object is. ( please answer in the unit of
kg/m^{3})

5.)What is the direction of net buoyant force from the fluid to
a submerged object?

a.)Right

b.)Up

c.)Left

d.)Down

6.)What does Archimedes' principle say about the buoyant
force?

a.)It is equal to the weight of the displaced liquid.

b.)It is equal to the weight of the submerged object.

c.)It is equal to the weight of the container of the liquid.

d.)It is equal to the weight of the entire liquid.

7.)Why does a hollow Iron ship float in water but a solid iron
nail sink?

a.)Weight of nail is more than the ship.

b.)Weight of nail is less than the ship.

c.)Ship displaces enough water to balance its weight but nail
doesn't.

d.)Nail displaces enough water to balance its weight but ship
doesn't.

8.)Why does an iron nail float in mercury but sink in
water?

a.)Density of mercury is less than iron but density of water is
more than iron.

b.)Density of mercury is more than iron but density of water is
less than iron.

c.)Iron weighs less in mercury.

d.)Iron weighs more in mercury.

9.)A floating ship is more submerged in fresh water than in salt
water. Why?

a.)Salt increases the density and hence the weight of the displaced
water.

b.)Salt decreases the density and hence the weight of the displaced
water.

c.)Salt decreases the mass of the ship.

d.)Salt increases the mass of the ship.

10.)A cylinder is allowed to float first in liquid A then in liquid B. The height of the submerged part in liquid A is 1.33 times the height of the submerged part in liquid B. What is the ratio of the density of liquid A to Liquid B?

Answer #1

5) net buoyant force always act in UP direction

How does the magnitude of the buoyant force acting on the
floating object compare to the weight of the object, and to the
weight of the water displaced by the floating object? The wood
floated and the brick did not. What conditions, in terms of forces,
are required for an object to float? What conditions are required
in terms of the densities of the object and the fluid for the
object to float?

An object of mass 1.6 kg and volume 0.0022 m3 is placed into a
fluid of density 1.33 ✕ 103 kg/m3. The fluid is at rest.
(a) Will the object float or will it sink in the fluid? float
sink
(b) If it floats, what fraction of volume is immersed in the
fluid? If it sinks, find its acceleration, ignoring any drag force
on the object. (Enter the magnitude of the acceleration if it
sinks.)

1. If the buoyant force of an object is 300 N, and it displaces
a volume of 14 m3, find the density
of the fluid.
a) 21.43 kg/m3
b) 30.61 kg/m3
c)2.18 kg/m3
d) 5.16 kg/m3
2. Find the frequency of an object that gives of an energy of
3.2x10-33J.
a) 2.12x10-66 Hz
b) 6.2x107 Hz
c) 4.8 Hz
d) 1.07x10-41 Hz
3. You observe a blue star that emits a wavelength of λ = 483
nm. Find the temperature...

As shown in the above figure, a solid object has a density of
1200 kg/m3 and a volume of 8.00x10^-5 m³. It is lowered on a string
into water and completely submerged without touching the container.
The density of water is 1000 kg/m3.
Keep 3 decimal places in all answers. (Don't use scientific
notations.)
Without the string, would the solid object sink in water or
float in water? No submission.
(a) What is the magnitude of the weight (in Newtons)...

A 20.2 kg copper mass rests on the bottom of a pool. (The
density of copper is 8.92 ✕ 103 kg/m3 and the density of water is
1.00 ✕ 103 kg/m3.) HINT Archimedes' principle states, "Any object
completely or partially submerged in a fluid is buoyed up by a
force with magnitude equal to the weight of the fluid displaced by
the object." Click the hint button again to remove this hint. (a)
What is the volume of the copper...

Question 3. Choose whether each of the
following statements is True or False:
a)The pressure at certain depth in
water is less than that at the same depth in oil.
b)As you go deeper in a swimming pool,
the buoyant force on you changes with depth.
c)The buoyant force on a floating
object must be equal to the weight of the object.
d)A ship does not sink in seawater
because the density of steel is less than that of seawater....

PLEASE SHOW WORK AND EXPLAIN!
NASA builds a raft made of styrofoam that can just support the
weight of three astronauts without submerging. The weight of
each astronaut is 733 N. Neglecting the weight of the raft
itself, which is very light, what is the volume of the raft?
(a) 0.11 m3
(b) 0.22 m3
(c) 0.44 m3
(d) 1.20 m3
(e) 1.50 m3
QUESTION 40**
The raft is now transported to Mars. After being loaded with the
same three astronauts in the Mars colony...

WOODEN CYLINDER
VALUES
mass (kg)
0.0354
weight (N)
0.34692
length (m)
0.290
diameter (m)
0.0163
volume (m3)
0.0002086
density (kg/m3)
169.7
WATER
VALUES
density (kg/m3)
1000
Vi (m3)
180 ml
V (m3)
213 ml
?V (m3)
33 ml
weight of displaced water (N)
0.3234
BRASS CYLINDER
VALUES
weight (N)
2.002
length (m)
0.0605
diameter (m)
0.0192
radius (m)
0.0095
volume (m3)
0.00001751
WA (N)
1.765
ALUMINUM CYLINDER
VALUES
weight (N)
0.621
length (m)
0.0605
diameter (m)
0.0192
radius (m)
0.0096...

In addition to the buoyant force, an object moving in a liquid
experiences a linear drag force Fdrag = (bv, direction opposite the
motion), where b is a constant. For a sphere of radius R, the drag
constant can be shown to be b = 6πηR, where η is the viscosity of
the liquid. Consider a sphere of radius R and density ρ that is
released from rest at the surface of a liquid with density ρf.
a. Find an...

1. Three objects have the same volume, one spherical, one
rectangular, and the other cylindrical. If you put these 3 objects
under water, how do their buoyant upward forces compare?
A.
According to Archimedes’ Principle, they are all subject to the
same amount of buoyant forces because they have the same volume
B.
The cylindrical object gets the most buoyant force because it
has a longer shape
C.
The rectangular object gets the most buoyant force because of
its flat...

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