Answer: B
Explanation:
R=A+B
A goes south
B goes east
R=
A+B=
South+East=Southeast ==> B
Answer:
B
Explanation:
Vectors are drawn as lines with arrowheads on them.
Vectors can be added together by drawing the arrows nose to tail.
To add vectors A and B, place the tail of vector B at the nose of vector A (see attached diagram).
The single vector that goes from the start to the end of the combined vectors is called the resultant vector.
As R = A + B, then R is the resultant vector of A and B.
R starts at the tail of vector A and goes to the nose of vector B.
Water molecules are formed by covalent
bonding. What effect does this have on
the water molecule?
creates a polar molecule with two positive
ends
creates a nonpolar molecule with two positive
ends
creates a nonpolar molecule with one positive
and one negative end
creates a polar molecule with one positive
and one negative end
Answer:
When covalent compounds dissolve in water, they break apart into molecules, but not individual atoms. Water is a polar solvent, but covalent compounds are usually nonpolar. This means covalent compounds typically don't dissolve in water, instead, it makes a separate layer on the water's surface.
Explanation:
I don't understand the second part but hope this helps.
A 10 kilogram sled is pulled across a frictionless surface with a force of 50 newtons for a distance of 10 meters. The pull is applied to the sled for a time of 2.0 seconds.
Answer:
The power will be "250 watt". A further explanation is given below.
Explanation:
The given values are:
Force,
F = 50 N
Displacement,
d = 20 m
Time,
t = 2.0 seconds
Whenever the block is pulled, the angle will be "0" i.e., Cos0° = 1
Now,
The work will be:
= \(Force\times displacement\times \Theta\)
On substituting the given values, we get
= \(50\times 10\times Cos0^{\circ}\)
= \(50\times 10\times 1\)
= \(500 \ Newton\)
Now,
The Power will be:
= \(\frac{Work \ done}{time}\)
= \(\frac{500}{2.0}\)
= \(250 \ watt\)
when you stand in front of a convex mirror, the image you see is a. real and upright. b. real and inverted. c. virtual and inverted. d. real and inverted if your distance from the mirror is greater than two focal lengths. e. virtual and upright.
when you stand in front of a convex mirror, the image you see is
e. virtual and upright.
convex mirror:
A mirror that has a curved reflecting surface is said to be curved. Convex (bulging outward) or concave surfaces are both possible (recessed inward).
Convex mirrors have curved surfaces that protrude outward toward the source of light. Instead than being used to focus light, this protruding surface simply reflects it outward.
Convex mirrors include, but are not limited to, those used as calling bells, optical devices, and vehicle rear-view mirrors.
Parallel light rays strike a convex mirror, reflect outward, and move away from an imagined focal point in a straight line (F). When a ray reaches that tiny area of the surface, it still reflects at the same angle.
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A ball is thrown vertically upward and then comes back down. During the ball's flight up and down, its velocity and acceleration vectors are?
During the ball's flight up its velocity and acceleration vectors are in opposite direction and during the ball's flight down its velocity and acceleration vectors are in same direction.
The velocity vector is always in the direction of motion of the object. So, during the ball's flight up its velocity vector is in the upward direction (90°) and during the ball's flight down its velocity vector is in the downward direction (270°).When there is a positive acceleration in the object the acceleration vector is in the direction of motion of the object. When there is a negative acceleration in the object the acceleration vector is in the opposite direction of motion of the object. So, during the ball's flight up its acceleration vector is in the downward direction (270°) and during the ball's flight down its acceleration vector is in the upward direction (90°).Velocity vector is the rate of change of position of an object. Acceleration vector is the rate of change of velocity of an object.
Therefore, during the ball's flight up its velocity and acceleration vectors are in opposite direction and during the ball's flight down its velocity and acceleration vectors are in same direction.
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8. A projectile launched horizontally with a speed of 10.0 m/s hits the ground in 1.2 seconds. If the projectile
had been launched at 20 m/s in the same direction, it would have hit the ground in
a. 0.6 seconds
b. 1.2 seconds
c. (2.4 seconds
d. 4.8 seconds
Answer:a
Explanation:
Plsss ASAP I need answer nowwwwwwww
Explanation:
-3m/s
0
2.5 m/ sec2
hope its right
a system releases 425 kj og heat and does 307 kj of work on the surroundings in the process. what is the change in the internal energy of the system
A system produces 307 kj of work for the environment while releasing 425 kj of heat. The system's internal energy changes as 118kj
According to the first law of thermodynamics, heat is a form of energy, and consequently, thermodynamic processes are governed by the idea of conservation of energy. Heat energy cannot be created or destroyed, so it makes sense.
Given that heat released by system (Q) = -425kj as heat is released
Work done by the system (W) = -307kj
internal energy change in the system is ΔU
ΔU = Q + W = -425 + (-307) = -732kj
Because we know from conservation of energy Q>0 and W<0
There is decrease in internal energy
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If the distance between us and a star is doubled, with everything else remaining the same, the luminosity If the distance between us and a star is doubled, with everything else remaining the same, the luminosity remains the same, but the apparent brightness is decreased by a factor of two. is decreased by a factor of four, but the apparent brightness remains the same. is decreased by a factor of two, and the apparent brightness is decreased by a factor of two. remains the same, but the apparent brightness is decreased by a factor of four. is decreased by a factor of four, and the apparent brightness is decreased by a factor of four.
Answer:
The luminosity remains the same, but the apparent brightness is decreased by a factor of four.
Explanation:
The apparent brightness, F = L/4πr² where L = luminosity and r = distance between us and the star.
Since L is independent of the distance between us and the star, it is constant, then
F ∝ 1/r²
So, F₁/F₂ = r₂²/r₁² where F₁ = apparent brightness at r₁ and F₂ = apparent brightness at r₂
If the distance is doubled, that is r₂ = 2r₁, then
F₁/F₂ = r₂²/r₁²
F₁/F₂ = (2r₁)²/r₁²
F₁/F₂ = 4r₁²/r₁²
F₁/F₂ = 4
F₂ = F₁/4
So, since the luminosity is constant, the luminosity remains the same, but the apparent brightness is decreased by a factor of four.
the density of a material is 8.53g/cm^3. express this in units
of kg/ft^3
The density of the material is approximately 530 kg/ft³ when converted.
Given the density of the material as 8.53 g/cm³, we can convert it to units of kg/ft³ using appropriate conversion factors. Firstly, we utilize the relationships: 1 g/cm³ = 0.001 kg/cm³ and 1 cm = 0.0328 ft. This allows us to convert the density from g/cm³ to kg/m³ as follows:
8.53 g/cm³ × (0.001 kg/g) ÷ (1 cm/0.01 m) = 8530 kg/m³
Next, to convert from kg/m³ to kg/ft³, we employ the conversion factor: 1 kg/m³ = 0.0624 lb/ft³. By applying this conversion, we get:
8530 kg/m³ × (0.0624 lb/ft³ ÷ 1 kg/m³) = 532.992 lb/ft³
Rounding the value to two significant figures, we obtain approximately 530 kg/ft³ as the density of the material.
It's worth noting that the density of a material represents the amount of mass per unit volume. In this case, the material has a density of approximately 530 kg/ft³, indicating that a cubic foot of the material weighs around 530 kilograms. Density is a crucial property in various scientific and engineering applications, as it helps determine the behavior and characteristics of substances.
Therefore, the density of the material is approximately 530 kg/ft³ when converted.
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using question 13, the measured initial kinetic energy (j) of the bullet is: hint: 1 gram = 1/1000 kg
a.15870 b.1.5 c.1500 d.15.01 e.15000 f.150.0 g.5.0 h.1.50
The measured initial kinetic energy (J) of the bullet is 158.70 J.
So, the correct answer is A.
We know that the initial kinetic energy (KE) of the bullet is given by:
KE = (1/2) mv²
Where,m = mass of the bullet
v = velocity of the bullet
So, the initial kinetic energy of the bullet can be calculated as:
KE = (1/2) mv²
KE = (1/2) (m) (v)²
To determine the initial kinetic energy of the bullet in Joules, we can use the formula KE = 1/2mv², where m is the mass of the bullet and v is its velocity.
From question 13, we know that the mass of the bullet is 0.023 g, which is equal to 0.023/1000 kg. We also know that its velocity is 330 m/s.
Plugging these values into the formula, we get KE = 1/2 x 0.023/1000 x (330)²= 158.7 J.
Therefore, the measured initial kinetic energy of the bullet is option A, 158.70 J.
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a solution has a strong absorption between 530 and 700 nm and absorbs light with the wavelength between 500-700 nm most intensely in the visible portion of the electromagnetic spectrum. what is the color of the solution perceived by the human eye?
The color that will be perceived by human eyes would be green.
The human's eyes and color perceptionThe solution will appear green to the human eye.
This is because the solution strongly absorbs light in the range of 530 to 700 nm, including the visible spectrum's green portion.
Additionally, the solution absorbs light most intensely in the wavelength range of 500 to 700 nm, which corresponds to the green and yellow-green regions of the spectrum. As a result, the solution appears green to the human eye.
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If your initial speed was 15 m/s , and you were heading due west, what was your average velocity during braking
Answer:
Your average velocity would be 20 m/s.
Explanation:
hope this helped!
The starter motor of a car engine draws a current of 150 a from the battery. the copper wire to the motor is 5.0 mm in diameter and 1.2 m long. the starter motor runs for 0.80 s until the car engine starts. a. how much charge passes through the starter motor
If the starter motor of a car engine draws a current of 150 a from the battery. the amount of charges that passes through the starter motor is 120C.
How to find the amount of charges?Using this formula to determine the amount of charges that passes through the starter motor
I = q/t
q= lt
Where:
L = Current = 150A
t = Starter motor = 0.8s
Let plug in the formula
q =150A × 0.8s
q =120C
Therefore we can conclude that the charges is 120C.
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Ellipses have only one focus. Question 14 options: True False
Answer:
False. This is because ellipses have 2 focus points and not only one.
A toy car with a resistance of 20.0 ohms is connected to a 6.0 volt battery.
How much current flows through the car?
Answer:
0.3 A
Explanation:
The current of the car can be found using the formula:
Current = \(\frac{Voltage }{Resistance}\)
= \(\frac{6}{20}\)
= 0.3 amps
thorium isotope (Th^232) has a half-life of 1.4*10¹⁰ years.
a)write the radioactive decay equation.
b) find the radioactive radiation activity of 10 g of thorium
c)and the activity after 10 years
The radioactive decay equation for thorium-232 is \(Th^{232} - > Ra^{228} + He^{4}\). To find the radioactive radiation activity of 10 g of thorium, calculate the number of nuclei using Avogadro's number and the decay constant. For the activity after 10 years, use the radioactive decay law with the appropriate values.
a) The radioactive decay equation for thorium-232 (\(Th^{232}\)) can be written as follows:
\(Th^{232} - > Ra^{228} + He^{4}\)
In this equation, thorium-232 undergoes alpha decay, transforming into radium-228 and emitting an alpha particle (helium-4 nucleus).
b) To find the radioactive radiation activity of 10 g of thorium, we need to calculate the number of thorium-232 nuclei in the given sample. First, we find the number of moles of thorium-232 by dividing the mass of the sample by its molar mass. The molar mass of thorium-232 is approximately 232 g/mol. Thus, the number of moles is:
Number of moles = 10 g / 232 g/mol
Next, we calculate the number of thorium-232 nuclei using Avogadro's number, which is approximately 6.022 × \(10^{23}\) nuclei/mol:
Number of nuclei = Number of moles × Avogadro's number
Finally, we determine the radioactive radiation activity (A) by multiplying the number of nuclei by the decay constant (λ). The decay constant (λ) is related to the half-life (T1/2) of thorium-232 through the equation:
λ = ln(2) / T1/2
The decay constant represents the probability of decay per unit time. Therefore, the activity can be calculated as:
Activity = λ × Number of nuclei
c) To find the activity after 10 years, we use the radioactive decay law, which states that the activity of a radioactive substance decreases exponentially with time. The remaining activity (A_t) after a given time (t) is given by the equation:
\(A_t = A_0 * (1/2)^{t/T1/2}\)
Where A_0 is the initial activity at t = 0. Substituting the initial activity calculated in part b, the decay constant, and the desired time of 10 years, we can determine the activity after 10 years.
In summary, the radioactive decay equation for thorium-232 is \(Th^{232} - > Ra^{228} + He^{4}\) . To find the radioactive radiation activity of 10 g of thorium, calculate the number of nuclei and multiply it by the decay constant. For the activity after 10 years, use the radioactive decay law and substitute the appropriate values.
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a circular loop of wire of radius 0.10 m carries a current of 6.0 a. what is the magnitude of the magnetic field at the center of the loop?
A. 1.2 x 10^-5 T
B. 1.2 x 10^-7 T
C. 3.8 x 10^-7 T
D. 3.8 x 10^-5 T
The magnitude of the magnetic field at the center of the loop is 1.2 x 10^-5 T. The correct option is a.
The magnetic field at the center of a circular loop of wire can be calculated using the formula for the magnetic field produced by a current-carrying wire. The formula is given by:
B = (μ₀ * I) / (2 * r)
where B is the magnetic field, μ₀ is the permeability of free space (4π x 10^-7 T·m/A), I is the current, and r is the radius of the loop.
Plugging in the given values, we have:
B = (4π x 10^-7 T·m/A * 6.0 A) / (2 * 0.10 m)
B = (2π x 10^-7 T·m) / (0.20 m)
B = π x 10^-7 T·m / 0.20 m
B = 5π x 10^-7 T
Approximating π as 3.14, we get:
B ≈ 5 x 3.14 x 10^-7 T
B ≈ 1.57 x 10^-6 T
Therefore, the magnitude of the magnetic field at the center of the loop is 1.57 x 10^-6 T, which is closest to 1.2 x 10^-5 T (option A).
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What is the height of the building if the gravitational potential energy is 800 J and the person standing on the top of the building weighs 50 N? GPE = w x h
Answer: Take a picture of the question please
Explanation:
In most cultures, the difference between the majority viewpoint and the minority viewpoint is that the majority group is made to feel __________ and the minority group is made to feel __________. A. Divergent. . . Normal B. Equal. . . Superior C. Superior. . . Equal D. Normal. . . Divergent Please select the best answer from the choices provided A B C D.
The difference between the majority viewpoint and the minority view is that the majority group is made to feel normal and the minority group is made to feel divergent.
What is the viewpoint?A vantage point or point of view from which something is viewed or assessed is known as the viewpoint The story is narrated from a variety of perspectives, including two major ones and several smaller ones.
Most studies comparing majority versus minority influence argue the author, places a premium on influence in the sense of prevailing. In this context.
There is evidence that majorities have greater public influence than minorities, and that minority impact when it happens, is mostly latent. In the current version,
Hence the difference between the majority viewpoint and the minority view is that the majority group is made to feel normal and the minority group is made to feel divergent.
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Answer: D
Explanation:
Simplified for you.
Two asteroids crashed. The crash caused both asteroids to change speed. Scientists want to use the change in speed and motion to figure out which asteroid has more mass. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the asteroids changed their motion.
Asteroid 1 has more mass than Asteroid 2.
Asteroid 1 and Asteroid 2 are the same mass.
Asteroid 1 has less mass than Asteroid 2.
Answer:
Asteroid 1 has more mass than asteroid 2
Explanation:
User avatar
thenoobygamerpro
01/25/2020
Physics
Middle School
answered
Asteroid 1 moving 8km/s right asteroid 2 moving 16 km/s left before the crash. After the crash asteroid 1 is moving 4 km/s left and changed speed bu 12km/s. Asteroid 2 moving 2km/s left and changed speed by 14km/s
Two asteroids crashed. The crashed caused both asteroids to change speed. Scientist want to use the change in speed and motion to figure out which asteroid has more mass. Based on the information in the diagram. which statement is correct? In your answer explain what the forces were like and why the asteroids changed motions
Asteroid 1 has more mass than asteroid 2
Asteroid 1 and asteroid 2 are the same mass
Or asteroid 1 has lees mass than asteroid 2
1
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Answer: Asteroid 1 has more mass than asteroid 2
Explanation:
We can use the conservation of momentum law to find the answer. So, according to this law:
"If two objects or bodies are in a closed system and both collide, the total momentum of these two objects before the collision will be the same as the total momentum of these same two objects after the collision".
This means the momentum before the collision or crash () is equal to the momentum after the collision ():
(1)
Before the crash:
(2)
Where:
is the mass of the first asteroid
is the velocity of the first asteroid
is the mass of the second asteroid
is the velocity of the second asteroid
(3)
After the crash:
(4)
Where:
is the final velocity of the first asteroid
is the final velocity of the second asteroid
(5)
Substituting (3) and (5) in (1):
(6)
Grouping similar terms:
(7)
Then:
(8) This means must be multiplied by 1.16 km/s in order to make this side of the equation equal to .
(i) The mass of snow that falls on the animal is 1.65 kg. The specific latent heat of fusion of
snow is 330000J/kg.
Calculate the thermal energy needed to melt this snow.
The energy that makes up a system's temperature, or thermal energy, is said to be present in the system.The required thermal energy is 2360J.
What is thermal energy ?The energy that makes up a system's temperature, or thermal energy, is said to be present in the system.
Thermal energy is emitted as heat.Thermodynamics, a distinct field of physics, examines how work is accomplished via the transmission of heat between various systems (see the first law of thermodynamics).
Mass of aluminum = 25g
Melting point = 658°C
Latent heat of melting = 94.4j/g
Unknown:
Amount of heat require for melting = ?
The amount of heat required for this melting will be the product of the mass of the aluminum and the latent heat of melting;
H = m L
m is the mass
L is the latent heat of melting
insert the parameters and solve;
H = 25 x 94.4 = 2360J
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The process of a nucleus giving off radioactive particles to become more stable is called
Answer:
Radioactive Decay
Explanation:
1.) What is the key difference between mass and weight?
A )Mass is measured in Newtons
B )Weight is measured in grams or kilograms
C ) Weight is equal to mass x gravity
2.) In terms of particles, what is the difference between a liquid and a solid?
A) a liquid has more thermal energy than a solid
B) a solid has more thermal energy than a liquid
C) Both solids and liquids have the same amount of thermal energy
3.) A mixture is...
A) a pure substance
B) at least two substances chemically combined
C) at least two substances physically combined
4.)In terms of particles, what is the difference between a liquid and a solid?
A) a liquid has more thermal energy than a solid
B) a solid has more thermal energy than a liquid
C) both solids and liquids have the same amount of thermal energy
Answer: C, A, C, A
Explanation:
I apologize if incorrect. I answered these to the best of my abilities, please feel free to let me know if they were correct or incorrect.
find the amount of heat needed to increase the temperature
The amount of heat needed to increase the temperature of 150 kg of material by 10 K is 75,000 J.
To find the amount of heat needed to increase the temperature, you would need to use the specific heat capacity of the material and the amount of material given.
Let's say the specific heat capacity of the material is given as 50 J/(kg * K) and the amount of material is 150 kg.
If you need to increase the temperature by 10 K,
the amount of heat needed can be calculated as:
Amount of heat = mass x specific heat capacity x temperature increase ΔT = 10 K Amount of heat = 150 kg x 50 J/(kg * K) x 10 K= 75,000 J
Therefore, the amount of heat needed to increase the temperature of 150 kg of material by 10 K is 75,000 J.
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A box sits on a platform supported by a compressed spring. The box has a mass of 1.0 kg. When the spring is released, the spring gives 14.7 J of energy to the box. What will be the maximum height above the platform reached by the box before it begins to fall
The maximum height above the platform reached by the box before it begins to fall is 1.5 m.
The given parameters:
Mass of the box, m = 1.0 kgEnergy stored in the spring, E = 14.7 JThe maximum height above the platform reached by the box before it begins to fall is calculated as follows;
\(mgh = E\\\\h = \frac{E}{mg} \\\\h = \frac{14.7}{1 \times 9.8} \\\\h = 1.5 \ m\)
Thus, the maximum height above the platform reached by the box before it begins to fall is 1.5 m.
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What is the buoyant force on 5kg solid object with density of 2×10⁴kg/m³ immersed in fluid with 5×10³kg/m³ density?
Buoyancy force can be calculated with the equation
\(Fb = Vs × D × g\)
where
Fb = the buoyancy force,Vs = the submerged volume,D = the density of the fluid the object is submerged in,g = the force of gravity.In this case, the weight of the ball is 5 kg and the density of the ball is 2× 10⁴kg/m³
Therefore the volume is given as
\(v = \frac{m}{d} = \frac{5}{2 \times 10 {}^{4} kgm {}^{ - 3} } \\ v = \: \frac{5}{20000} m {}^{ - 3} \)
Substituting the given values in the equation, we get,
\(Fb=Vs \times D \times g \\ Fb = \frac{5}{20000} m {}^{3} \times 5000kgm {}^{ -3} \\ \times10ms {}^{ - 2} \\ = 12.5N\)
Hence, the force of buoyancy is 12.5N.what is an avcoto????//
Answer:
avocado, also called alligator pear, fruit of Persea americana of the family Lauraceae, a tree native to the Western Hemisphere from Mexico south to the Andean regions.
Explanation:
Match the phrase with word please help!
Phrases:
1.) The amount of work done when jerry carries a box from his house to the moving truck . He exerts a force of 35 N while carrying the box 4 meters
2.) The power resulting from 420 Nm of work being completed in 3 seconds
3.) The amount of work done when Fido carries his toy from the backyard to his crate. He exerts a force of 1.2 N over a distance of 15 m
4.) The power resulting from 120 Nm of work being completed in 20 seconds
A.) 140 joules
B.) 140 Newton-meters
C.) 6 joules
D.) 6 Newton-meters
Answer:
1-B, 2-A, 3-D, 4-C
Explanation:
1. The force exerted is, F = 35 N
Distance the box is moved, d = 4 m
So the amount of work done is, W = F x d
= 35 x 4
= 140 Newton-meters
2. Work done, W = 420 Nm
Time, T = 3 seconds
Therefore, the power required is,
\($P=\frac{W}{T}$\)
\($P=\frac{420}{3}$\)
= 140 joules
3. The force exerted is, F = 1.2 N
Distance the box is moved, d = 5 m
So the amount of work done is, W = F x d
= 1.2 x 5
= 6 Newton-meters
4. Work done, W = 120 Nm
Time, T = 20 seconds
Therefore, the power required is,
\($P=\frac{W}{T}$\)
\($P=\frac{120}{20}$\)
= 6 joules
A wave with a frequency of 3kHz was found to
oscillate 440 times.
Over what time period was it measured?
Give your answer to 2 decimal places.
The time interval is 0.15 s
What is the frequency of oscillation?The frequency of oscillation refers to the number of cycles of a periodic waveform that occur per unit of time, usually measured in hertz (Hz), which represents cycles per second.
Based on the information that can get in the question that has been put before us here and now;
Note that;
Frequency = Number of oscillations/Time
3 * 10^3 = 440/time
Time = 440/3 * 10^3
Time = 0.15 s
Thus we can see from the calculation that the time that is taken is 0.15 s
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Think about the reasons behind the cost of the Birkin bag and explain why it costs $60,000 in your own words. Do you think that this is a good marketing strategy? Why? Can you think of any other products (clothes / elctronics / anything) that use the same strategy? Does it work?
Answer:
In terms of both price and availability, the Birkin bag is as elusive as it is exclusive. For more than two decades, the bag has been the most sought item in the handbag industry. For such a modest bag, that's a lot of staying power (in looks alone, the design itself takes some 18 hours and is done by a single craftsman).
Of course, it's likely that the bag's rarity is what keeps it at the top of every want list. It is difficult, for example, to stroll into a Hermès store and buy a bag –– even if you could afford to pay the minimum price of $10,000. No, you have to be on an elite list to receive a Birkin.
Explanation:
There are alot more things like the Birkin Bag that use the same marketing skills and it works for alot of companies.