A train is approaching you at very high speed as you stand next to the tracks. Just as an observer on the train passes you, you both begin to play the same recorded version of a Beethoven symphony on identical MP3 players.(b) What If? According to the observer on the train, whose MP3 player finishes the symphony first?

The question pertains to the Bernoulli equation and asks about the initial substitution that needs to be made when working with this equation.

To begin working with the Bernoulli equation, the initial substitution involves replacing the total pressure (which includes both static pressure and dynamic pressure) with the sum of the static pressure and the pressure due to the velocity of the fluid. This substitution simplifies the equation by separating the pressure terms from the velocity terms. The Bernoulli equation relates the pressure, velocity, and elevation of a fluid along a streamline and is derived from the principles of conservation of energy for an ideal, incompressible fluid flow.

The Bernoulli equation states that the sum of the pressure energy, kinetic energy, and potential energy per unit volume of fluid is constant along a streamline. By substituting the total pressure with the sum of static pressure and the pressure due to velocity, the equation becomes more amenable to analysis and can provide insights into the behavior of the fluid flow. This initial substitution is crucial for applying the Bernoulli equation and analyzing various fluid flow scenarios, such as in pipes, nozzles, and airfoils.

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Answer:

Coins made of a good conductor will slow down as they roll past the magnet.

Explanation:

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.

One of the ways in which a coin operated vending machine checks to make sure that the coins fed to it are genuine is to roll them past a strong magnet. As such, coins made of a good conductor will slow down as they roll past the magnet due to the force of attraction that exists between the magnet and the coin (metal).

This ultimately implies that, the magnet tends to attract the coin to itself and as such slowing down the motion of the coin. Similarly, if it's a fake coin, it simply means it would be a bad conductor and as such it will roll fast past the strong magnet.

3,970.8

Explanation:

v=661.8×6

3,970.8

Answer:

50 horas

Explanation:

Datos:

velocidad inicial: \(v_{i}=0km/h\) (inicia del reposo)

velocidad final: \(v_f=100km/h\)

aceleración: \(a=2km/h^2\)

Usando la formula de la velocidad final con aceleracion constante:

\(v_f=v_i+at\)

donde t es el tiempo.

De la formula anterior despejamos para el tiempo t:

\(t=\frac{v_f-v_i}{a}\)

sustituimos los valores:

\(t=\frac{100km/h-0km/h}{2km/h^2}\\ \\t=\frac{100km/h}{2km/h^2}\\ \\t=50h\)

Answer:

Gravitational.

Explanation:

In Earth, everything have a volume and mass, or downward force of gravity, which Earth's mass exerts on them.

If the voltage at node n is 0 V , then the voltage at node N is also 0 V .

In the question ,

the voltage at the node n is = 0 V and

\(V_{an} (t)\) = 10cos(5t) , \(Z_{line}\) = 5 Ω, and \(Z_{motor}\) = 5 Ω .

From the figure given below , we have to find the voltage at node N .

So , for balanced source ,

equal line impedance ,  \(Z_{line}\) = 5 Ω for all phases and

balanced load (motor) that is  \(Z_{motor}\) = 5 Ω for all 3 phases then ,

Voltage at neutral Source = voltage at neutral at load

that is   Vₙ = \(V_{N}\) , and it is given that  Vₙ = 0.

So ,  \(V_{N}\)  will also = 0 .

Therefore , the voltage at node N will be 0  , the correct option is (a) 0 V .

The given question is incomplete , the complete question is

If the voltage at node n is 0V (reference ground) and \(V_{an} (t)\) = 10cos(5t) , \(Z_{line}\) = 5 Ω, and \(Z_{motor}\) = 5 Ω , What is the voltage at node N ?

(a) 0 V

(b) 1cos(5t) V

(c) 1 V

(d) 5cos(5t) V

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Donita is employing the defense mechanism of displacement. Displacement is a defense mechanism where an individual redirects their feelings or impulses from one target to a less threatening or more acceptable one.

In this case, Donita's anger towards her boss is being displaced onto her physical activity of running. By leaving work early and running an extra mile, Donita is using exercise as a means to release her anger and frustration in a healthier way. Instead of confronting her boss directly or engaging in destructive behavior, she channels her negative emotions into a productive activity that allows her to release tension and regain a sense of control.

Running serves as a symbolic outlet for Donita to channel her anger and redirect it towards a non-threatening target. Engaging in physical exercise can provide a release of pent-up emotions, as it helps to reduce stress, increase endorphin levels, and promote a sense of well-being. By focusing on running and the physical exertion it requires, Donita can temporarily distance herself from the source of her anger and find a sense of relief. This displacement defense mechanism allows her to cope with her negative emotions in a constructive manner, promoting both her physical and mental well-being.

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Answer:

The group number indicates the number of valence electrons specific to the group, which is directly related to the number of electrons lost or gained while forming a compound.

Explanation:

What is an element's oxidation number?
The oxidation number of an element is the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.

The group number indicates the number of valence electrons specific to the group, which is directly related to the number of electrons lost or gained while forming a compound. For example, group 1 metals are always +1 and group 2 metals are always +2.

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Together, the two cars are traveling at a speed of 29.11 m/s.

As a result,

The car's mass is 1 m = 1250 kg.

Initially, the car's speed was 1, u = 32 m/s.

Car 2 mass, m' = 875 kg

The starting speed of vehicle 2 is 25 m/s.

both vehicles stick together. An inelastic collision is a situation here. The pace is maintained. Let V be the combined speed of the two vehicles.

Using conV = 29.11 m/s, it is determined.

Thus, the combined speed of the two cars is 29.11 m/s. Therefore, this is the necessary solution. momentum preservation as:

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Answer:

The answer is below

Explanation:

A 140 kg load is attached to a crane, which moves the load vertically. Calculate the tension in the

cable for the following cases:

a. The load moves downward at a constant velocity

b. The load accelerates downward at a rate 0.4 m/s??

C. The load accelerates upward at a rate 0.4 m/s??

Solution:

Acceleration due to gravity (g) = 10 m/s²

a) Given that the mass of the crane (m) is 140 kg. If the load moves downward, the tension (T) is given by:

mg - T = ma

Since the load has a constant velocity, hence acceleration (a) = 0. Therefore:

mg - T = m(0)

mg - T = 0

T = mg

T = 140(10) = 1400 N

T = 1400 N

b)  If the load moves downward, the tension (T) is given by:

mg - T = ma

T = mg - ma = m(g - a)

T = 140(10 - 0.4) = 140(9.96) = 134.4

T = 134.4 N

c)  If the load moves upward, the tension (T) is given by:

T - mg = ma

T = ma + mg = m(a + g)

T = 140(0.4 + 10) = 140(10.4)

T = 145.6 N

2) To find the distance (s) if the load move from rest (u= 0) and accelerates for 20 seconds (t = 20). We use:

s = ut + (1/2)gt²

s = 0(20) + (1/2)(10)(20)²

s = 2000 m

Answer:

converts high-voltage, low-current power into low-voltage, high-current power.

Explanation:

Answer:

1, 3, 5,

Explanation:

A concave mirror is a hollowed sphere that has been cut into parts, each of which has a painted exterior. The plant's image has the qualities of a real, inverted, and smaller image. So, the correct options are A, C and E.

A hollow spherical formed into a mirror when the external surface of the each cut portion was painted, reflecting light from the interior surface. This kind of mirror is known as a concave mirror. When the concave mirror is placed too close to the item, a magnified and phoney image results.

This has an inward-curving reflective surface that faces away from the source of light. Light is reflected internally to a single focus point. Headlights on cars and torches are examples of concave mirrors. But, as the distance grows between the object and the mirror, the size of the image reduces and a real image is produced.

Thus, the correct options are A, C and E.

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Your question is incomplete, most probably the complete question is :

Leo places a plant in front of the center of curvature of a concave mirror. Which characteristics will the image of the plant have? Check all that apply.

Answer:

e.g. means "for example" but is physics is also stands for gravitational potential energy

During an experiment you record the temperature at which crystals of sugar begin to liquefy. This is called the melting point of the sugar.

Melting point is the temperature at which the solid and liquid phases of a substance are in equilibrium.

A solid substance, when subjected to heat, is capable of changing state to a liquid. The temperature at which the change of state occurs is called the melting point.

According to this question, the temperature at which crystals of sugar begin to liquefy is recorded.

This suggests that this temperature is called the melting point of sugar.

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Answer:

Explanation:

Using the equation of motion v² = u²+2as

v is the final velocity = 40m/s

u is the iniyail velocity 0m/s

a is the acceleration

s is the displacement

Substituting in the formula;

40² = 0²+2a(50)

1600 = 100a

Divide both sides by 100

100a/100 = 1600/100

a = 16

Hence the car acceleration is 16m/s²

Explanation:

tan(theta)=(v^2)/(length of string × g)

=(1.4^2)/(0.84 × 9.8m/s )

=1.96/(8.232)

=0.2380952381

theta=arctan(0.2380952381)

=13.4°

Explanation:

What is the difference between the displacement of the photographer flying from FL to CA and the displacement of astronauts flying from CA back to FL? The displacements have opposite directions. Car 'A' travels from New York City to Miami ata speed of 25 m/s.

F = ma, or force equal to mass times acceleration, is Newton's second law of motion.

Second Law of Movement by Newton Since it shows how powers and movement are connected, F=ma is essential. You can use it to determine an object's velocity and position, as well as its acceleration with known forces. For inventors, scientists, and engineers, This is extremely helpful.

As per Newton's Second Law of Movement, when a power works on a mass, the mass speeds up (gains speed) (object). When you ride a bicycle, you can see this law of motion in action in a great way. Your bike makes up the mass. Your leg muscles press against the bicycle's pedals to produce the force.

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Answer: 15m..............

Answer:

A: Excess H+ is absorbed by bicarbonate ions.

Explanation:

Answer:

No. 3, 4, 5, and 8 are scalar quantities

The particle's turning points, speed at a specific position, maximum speed, description of motion, and possible motions with a different potential energy are discussed.

a) The particle's turning points occur at approximately x = -1.0 m and x = 3.5 m, where the potential energy is at its maximum and minimum values.

b) The particle's speed at x = 2.0 m can be determined by calculating the kinetic energy at that position using the conservation of mechanical energy. Since the mechanical energy is given as 12 J and the potential energy at x = 2.0 m is known, the kinetic energy can be found and then converted to speed.

c) The particle's maximum speed occurs at the positions where its kinetic energy is at its maximum. This can be determined by finding the positions where the potential energy is at its minimum, using the conservation of mechanical energy.

d) The motion of the particle from the left turning point to the right turning point can be described as oscillatory motion or simple harmonic motion. As the particle moves away from the left turning point, it accelerates due to the change in potential energy, reaches maximum speed at the equilibrium position, and then decelerates as it approaches the right turning point.

e) If the potential energy is lowered to 4.0 J, the particle will have a different equilibrium position and the turning points will be at different locations.

The specific motions of the particle will depend on the new shape of the potential energy graph, and it could exhibit oscillatory motion or other types of motion depending on the specifics of the potential energy function.

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Answer:

650N

Explanation:

we're using w=m×g

and gravity on earth is 10N

so it'll be

W=65 (being the mass) × 10

=650N

(explanation for a)

Answer:

pressure=force (N)/area (square metres)

Answer:

1.76 seconds/cycle

Explanation:

Frequency is   10 cycles / 17.6 seconds

PERIOD is  1/frequency = 17.6 seconds/10 cycles = 1.76 s/c    

          cycle is a vibration , so the unit may be  1.76 second / vibration

Answer:

They are all composed of gases.

Explanation:

The inner planets are mainly composed of types of rock. The surface and interior is rocky but the atmosphere is composed of gases. The outer planets happen to be composed mainly of gas, or in other terms, elements. The two primary elements that make up these planets are hydrogen and helium. Because the inner planets are made up of primarily, they have given the nickname the "Terrestial Planets" and the outer planets are called "Gas Giants" because of their gas (elements) composed atmospheres and overall interiors.

Answer: A: they are composed of gas

Explanation:

.Explanation:

.......................................................

The gymnast's velocity as she lands on the ground is approximately 8.06 m/s.You need to understand that the gravitational acceleration on Earth is approximately 9.8 m/s² and the velocity of the gymnast changes from 4.0 m/s upward to some final velocity down when she lands.

Also, the height of the bar and the height of the ground level will be used in solving this problem.Using the formula for motion with constant acceleration:

`v² = u² + 2as`

where `v` is the final velocity, `u` is the initial velocity, `a` is the acceleration, `s` is the displacement.

Substituting the given values of the gymnast's velocity, acceleration due to gravity, and the displacement:

`v² = u² + 2as` becomes

`v² = 4.0² + 2(-9.8)(-2.5)`

Note that the negative sign was used since the displacement of the gymnast is in the downward direction.

Therefore: `v² = 16.0 + 49.0`

=> `v² = 65.0`

To find `v`, we need to take the square root of both sides:

`v = sqrt(65.0)`

=> `v ≈ 8.06 m/s`

Therefore, the gymnast's velocity as she lands on the ground is approximately 8.06 m/s.

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Answer:

Explanation:a. The ring will fall slower than free fall as it falls around the magnet.

When a conducting ring falls towards a magnet, it experiences a changing magnetic field due to the magnet's presence and its motion. According to Faraday's law of electromagnetic induction, a changing magnetic field induces an electric current in a conducting loop. In this case, the induced current in the ring creates a magnetic field that opposes the motion of the magnet.

By Lenz's law, the induced magnetic field in the ring acts in such a way as to oppose the change that caused it. In this scenario, the ring falling towards the magnet creates a change in the magnetic field, and the induced current in the ring produces a magnetic field that opposes the motion of the magnet. This opposing force between the ring and the magnet results in a reduction in the acceleration of the ring, causing it to fall slower than it would under free fall conditions.

b. If the ring has a section cut from it, making it an incomplete ring, the cut ring will fall at the same rate as free fall around the magnet.

When a section is cut from the ring, it breaks the conducting path, preventing the formation of a complete loop. Without a closed conducting loop, there is no continuous path for the induced current to flow. As a result, the magnetic field produced by the induced current is disrupted, and the opposing force between the ring and the magnet is not present.

Without the opposing force, the cut ring will fall freely around the magnet without any significant deviation from the acceleration due to gravity. Therefore, the cut ring will fall at the same rate as free fall when falling around the magnet.

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