state the order in which the following possible stages of a star occur: main-sequence star, planetary nebula, white dwarf, protostar, red giant.

When the mirror is moved so that the tree is between the focus point F and the mirror, the image appears shorter and on the same side of the mirror.This happens because of the phenomenon known as Reflection of Light. The mirror reflects light in such a way that it appears as if the light is coming from behind the mirror.

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The Earth's new period of revolution around the Sun would remain the same (option A) compared to its present orbital period.

According to Kepler's Third Law of Planetary Motion, the square of a planet's orbital period (T) is proportional to the cube of its average distance from the sun (r). Mathematically, it can be expressed as:

T^2 ∝ r^3

In this case, we are considering the scenario where the Sun has four times its present mass. However, the mass of the Sun does not affect the orbital period of the Earth directly. The Earth's orbital period is primarily determined by its distance from the Sun and the Sun's mass does not change this distance significantly.

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It is true that we can only perform ideal calculations under normal pressure and temperature.

The nominal air temperature at sea level are referred to as STP, or normal temperature and pressure. The conditions are 0 °C and 1 atmosphere of pressure, respectively.

It is now simpler to compare various measures for gasses, such as the number of molecules of gas in a certain volume. For scientists to be able to compare different sets of data in a meaningful way, a global standard for temperature and pressure must be established.

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The velocity of an electron in the third orbit of a hydrogen atom would be:

v = (3 * \(e^2\))/(4πε₀ * h)

The velocity of an electron in the first orbit of a hydrogen atom can be calculated using the Bohr model. According to the Bohr model, the velocity of an electron in the first orbit is given by the equation:

v = (Z * \(e^2\))/(4πε₀ * h)

where v is the velocity, Z is the atomic number of the atom (which is 1 for hydrogen), e is the elementary charge, ε₀ is the permittivity of free space, and h is Planck's constant.

If we want to calculate the velocity of an electron in the third orbit of a hydrogen atom, we can use the same equation, but with a different value for Z. In this case, Z would be 3, since we are considering the third orbit.

Therefore, the velocity of an electron in the third orbit of a hydrogen atom would be:

v = (3 * \(e^2\))/(4πε₀ * h)

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Complete Question: What would be the velocity of an electron in the third orbit of a hydrogen atom, given the velocity of an electron in the first orbit?

Answer:

Thermal energy can be transferred to one object to another in the form of heat. It causes molecules and atoms to collide with each other because of the rising of heat.

Explanation: Well thermal energy is a example of kinetic energy. It is heated by motion. It is heat that can be measured

Answer:

1 through 92 occur naturally on Earth

Answer:

1.5 m\s Ans ......

Explanation:

Data:

f = 0.5 Hz

w = 3 m

v = ?

Formula:

v = fw

Solution:

v = (0.5)(3)

v = 1.5 m\ s Ans ........

Answer:

1 mole of every substance has 6.022 × 10^23 particles. This is called Avagadro's constant

Answer:

waves

Explanation:

There are three major ways in which heat or thermal energy is transferred namely: conduction, convection and radiation. Please find the description of each below;

- Conduction is the method of heat transfer which involves a physical contact between the substances involved.

- Convection, on the contrary, occurs via a liquid medium

- RADIATION is a method of heat transfer which involves neither physical contact or liquid medium (matter) but occurs through WAVES e.g electromagnetic waves. For example, the sun transfers heat to the Earth via RADIATION.

Radiation transfers thermal energy through electromagnetic waves.

When it comes to transferring thermal energy, there are three primary methods:

Conduction: This involves the direct contact and transfer of heat between particles of a solid material.

Convection: This occurs in fluids (liquids and gases) when heated particles move and carry thermal energy with them.

Radiation: This method does not require any medium or direct contact. Instead, thermal energy is transferred through electromagnetic waves, such as infrared radiation, which can travel through a vacuum or transparent medium (like air).

Hence, the complete statement would be: "Radiation transfers thermal energy through electromagnetic waves, without the need for direct contact of particles or a medium."

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When the tunnel is running, a pitot tube mounted in the test section measures 2.4 atm, the reservoir pressure for the wind tunnel is approximately 0.585 atm.

To solve this problem, we can use the isentropic relations for a compressible flow through a nozzle. Assuming the flow is adiabatic and reversible (i.e., isentropic), we can relate the pressure ratio to the area ratio through the following equation:

(p2/p1) = (A1/A2)^γ

where p1 and p2 are the pressures at the throat and exit, respectively, A1 and A2 are the throat and exit areas, and γ is the specific heat ratio of the gas.

In this problem, the area ratio is given as A2/A1 = 5. The pitot tube measures the pressure at the exit, which we can call p2. We want to find the reservoir pressure, which we can call p1.

We can rearrange the above equation to solve for p1:

p1 = p2 / (A2/A1)^γ

Substituting the given values and assuming γ = 1.4 for air, we get:

p1 = 2.4 atm / 5^1.4

= 0.585 atm

Therefore, the reservoir pressure for the wind tunnel is approximately 0.585 atm.

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Answer: C

Where stress has built up between plates

Hope this helps, if wrong please let me know

Hope you get this right!

Answer:

A gas takes the shape of its container

To find the amplitude of the magnetic field of an electromagnetic wave with an intensity of 80 MW/m^2, we can use the formula for intensity (I):

I = 1/2 (ε₀c * E²) = 1/2 (μ₀c * B²)
where I is the intensity, ε₀ is the electric permittivity, c is the speed of light, E is the electric field amplitude, μ₀ is the magnetic permeability, and B is the magnetic field amplitude.

We want to solve for B, so we can rearrange the equation as follows:
B² = 2I / (μ₀c)
Now, plug in the given values:

I = 80 MW/m^2 = 80 x 10^6 W/m^2
c = 3.0 x 10^8 m/s
μ₀ = 4π x 10^(-7) T⋅m/A

B² = 2 * (80 x 10^6) / (4π x 10^(-7) * 3.0 x 10^8)
B² ≈ 3.392 x 10^(-10)

Now, take the square root to find the amplitude of the magnetic field B:

B ≈ sqrt(3.392 x 10^(-10))
B ≈ 5.82 x 10^(-6) T

Converting this to micro-teslas (µT) gives:

B ≈ 5.82 x 10^(-6) * 10^6 µT
B ≈ 5.82 µT

Since this is closest to option A (0.33 µT), the correct answer is A) 0.33 µT.

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Molecular Orbital Theory (MOT) is a key concept in understanding chemical bonding, and it explains the formation of bonds through the interaction of atomic orbitals. The essential feature of MOT responsible for bond formation is the concept of constructive and destructive interference between the overlapping atomic orbitals.

When two atoms approach each other, their atomic orbitals overlap and combine to form molecular orbitals. These molecular orbitals can be bonding or antibonding, depending on the nature of their interaction. Constructive interference occurs when the wave functions of the atomic orbitals combine in-phase, resulting in a lower energy molecular orbital with electron density concentrated between the nuclei. This increased electron density strengthens the electrostatic attraction between the positively charged nuclei and the negatively charged electrons, forming a stable chemical bond.

On the other hand, destructive interference occurs when the wave functions of the atomic orbitals combine out-of-phase, leading to the formation of a higher energy antibonding molecular orbital. In this case, electron density is reduced between the nuclei, creating a node that weakens the electrostatic attraction and destabilizes the bond. Electrons in antibonding orbitals can counteract the bonding effect of electrons in bonding orbitals.

Bond order, a measure of bond strength, is determined by the difference between the number of electrons in bonding and antibonding orbitals. A positive bond order signifies a stable bond, while a zero or negative bond order indicates that the bond is not formed or is weak.

In summary, the formation of molecular orbitals through constructive and destructive interference between atomic orbitals is the key feature of MOT responsible for bond formation. Bonding orbitals result in stable chemical bonds, while antibonding orbitals can weaken or prevent bonds from forming.

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The resistivity comes out to be \(=800×10 { }^{ - 4} Ωm\)

Given:

length,l=100vm or 1m

Area,A

Resistance,R

To find:

resistivity,ρ

ρ = RA/l

\( = \frac{400 \times 2 \times 10 {}^{ - 6} }{1} \)

\( = 800 \times 10 {}^{ - 4} Ωm\)

Thus,the resistivity comes out to be

Thus,the resistivity comes out to be \(=800×10 { }^{ - 4} Ωm\)

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Light takes approximately 5.59 nanoseconds to travel a distance of 5.50 ft in vacuum.

To calculate the time it takes for light to travel a given distance in vacuum, we can use the formula:

time = distance / speed of light

The speed of light in vacuum is approximately 299,792,458 meters per second.

First, let's convert the given distance of 5.50 ft into meters:

5.50 ft = 5.50 ft * 0.3048 m/ft = 1.6764 meters

Now, we can calculate the time it takes for light to travel this distance:

time = 1.6764 meters / 299,792,458 meters per second

time ≈ 5.59102452 × 10^(-9) seconds

Therefore, light takes approximately 5.59 nanoseconds to travel a distance of 5.50 ft in vacuum.

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The equation that describes the graph is y = 16.7x + 150.

We have been given the graph of a certain function data set in physics. We know that the graph is the representation of data on cartesian coordinates. In this case, we are asked to find the equation of the graph in the form; y=mx+b

m = slope of the graph

b = intercept of the graph.

To obtain the slope;

m = y2 - y1/ x2 - x1

m = 400 - 200/ 16 - 4

m = 200/ 12

m = 16.7

Then we can see from the graph that the y - intercept is 150. Having these data, the equation that could describe the graph is now;

y = 16.7x + 150

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1c 2c 3a 4a 5d

Explanation:

I just know.

ur welcome.

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Answer: regression

Regression is the defense mechanism of repressing thoughts of a traumatic or problematic event by reverting memory back to before it happened, so this is the closest one to the scenario in the answer.

Reaction formation is the mechanism in which a person does the opposite of what their impulse tells them to.

The radius of the event horizon for a black hole is measured by the Schwarzschild Radius.

Hence, the correct option is B.

The Schwarzschild Radius is a characteristic length scale associated with a non-rotating, spherically symmetric black hole.

It represents the radius of the event horizon, which is the boundary beyond which nothing, including light, can escape the gravitational pull of the black hole.

It is denoted by the symbol "rs" and is calculated based on the mass of the black hole. The Schwarzschild Radius determines the size of the event horizon and plays a crucial role in defining the properties of a black hole.

Therefore, The radius of the event horizon for a black hole is measured by the Schwarzschild Radius

Hence, the correct option is B.

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Answer: Stored energy

Initial speed of the coin (u)= 0 (As the coin is released from rest)

Acceleration due to gravity (a) = g = 9.81 m/s²

Time of fall (t) = 1.5 s

From equation of motion we have:

\( \boxed{ \bf{v = u + at}}\)

By substituting values in the equation, we get:

\( \longrightarrow \) v = 0 + 9.81 × 1.5

\( \longrightarrow \) v = 14.715 m/s

\( \therefore \) Speed of the coin as it hits the ground/Final speed of the coin = 14.715 m/s

The speed of the coin as it hits the ground is 14.715 m/s.

We can solve the problem above using the equation of acceleration under gravity.

⇒ Equation:

v = u+gt................... Equation 1

⇒ Where:

From the question,

⇒ Given:

Substitute these values into equation 1

Note the speed has a negative sign because it acts in the same direction as the acceleration due to gravity

Hence, the speed of the coin as it hits the ground is 14.715 m/s.

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The force which counteracts the thrust force for the flight is known as the drag force, as it opposes the flow.

Drag is a force that opposes an object's relative motion to a fluid environment in the field of fluid dynamics. It may be among two liquid film (or surfaces) or in between a liquid and a flat wall. The drag force is influenced by velocity, as opposed to other resistive forces like dry contact, which are essentially independent of it.

When a flow is moving at low or high speed, the drag force is equal to the speed for low pressure and to the square of the velocity for high-speed flow. Although viscous friction is what ultimately causes drag, turbulent drag is unaffected by viscosity.

A force in physics is an input that has the power to change an object's motion. A mass-containing object's velocity can vary, or accelerate, as a result of a force. Intuitively, a push or a pull can also be used to describe forces.

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The drag force, which resists the flow, is the force that balances the propulsion force for flight.

In the study of fluid dynamics, drag is a force that opposes an object's relative motion to a fluid environment. It could be situated between two liquid surfaces (or films) or between a liquid and a flat wall.

Unlike other resistive forces like dry contact, which are largely independent of velocity, the drag force is affected by it.

For low pressure and high speed flows, respectively, the drag force is equal to the speed for low pressure and the square of the velocity. Although drag is ultimately caused by viscous friction, turbulent.

Thus, The drag force, which resists the flow, is the force that balances the propulsion force for flight.

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  The centre of mass of the system is the point at which the total

  mass of system could be concentrated without changing the moment

  of the system.

Centre of Mass is the point at which the whole mass of the system

is assumed to be concentrated.

 The general formula for the COM is:

              xₙ =  Σmₐxₐ / Σmₐ         where,  a = 1,2,3.........n

  Here the term Σ mₐ xₐ is called the first moment of the system and the

  denominator expression is called total mass of the system.

    Therefore, from this theory we can say that the moment of the system

    remain unchanged while calculating the COM.

  Hence, The centre of mass of the system is the point at which the total

  mass of system could be concentrated without changing the moment

  of the system.

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The acceleration of the objects can be determined by applying Newton's second law and considering the tension in the string. The acceleration is found to be approximately 2.31 m/s², directed towards the heavier object.

To find the acceleration of the objects, we can consider the forces acting on each object. Let's assume the 39.0 kg object is hanging vertically, and the 18.0 kg object is on the horizontal surface. The tension in the string will be the same for both objects.

For the 39.0 kg object:

The gravitational force acting on it is given by F₁ = m₁g, where m₁ is the mass of the object and g is the acceleration due to gravity. As the object is accelerating downwards, there is a net force acting on it in the downward direction. The tension in the string is directed upwards. So, we have T - F₁ = m₁a, where a is the acceleration of the system. Therefore, T = m₁(g + a).

For the 18.0 kg object:

The gravitational force acting on it is F₂ = m₂g, where m₂ is the mass of the object. As the object is on a horizontal surface, the net force acting on it is given by T - F₂ = m₂a. Since the object is moving towards the right, the acceleration is directed towards the right.

Since the tension in the string is the same for both objects, we can equate the two expressions for T: m₁(g + a) = T = m₂g - m₂a. Solving this equation for a, we get a = (m₂g) / (m₁ + m₂) - (m₁g) / (m₁ + m₂). Substituting the given values, we find a = 2.31 m/s². The negative sign indicates that the acceleration is towards the heavier object.

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Answer:

me‍♀️

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Answer:

me it's annoying like just let us get the answer

Answer:

The objects in interaction A are farther apart than in interaction B.

The objects in interaction A are farther apart than in interaction B.

According to Coulomb's law: The magnitude of each of the electric forces with which two point-at-rest charges interact is directly proportional to the product of the magnitude of both charges.

And inversely proportional to the square of the distance that separates them and has the direction of the line that joins them.

The formula will be given as:

] \(F=\dfrac{kq_1q_2}{r^2}\)

Intersaction A is having weak force since the magnitude of the force is same in both interaction A and B from the formula of force the force is also dependent on the distance between the charge.

Thus the weak force in the interaction A is due to the higher distance between the two charges.

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According to the question; The output power is 0.643W.

Power is the quantity of energy that is transported or transformed per unit of time in physics. The watt, which is equal to one joule per second in the International System of Units, is the unit of power. Power may also be referred to as activity in earlier writings. A scalar concept is a power.

According to the question:

Power, P₁ = 150W

Sound intensity level, β = 103db

Distance, d = 1.60m

The sound intensity level is β = 10log(I/I₀)

Reference intensity I₀ = 10⁻¹²

By solving, Intensity, I = 0.02w/m²

Power output P₀ = (4πd²) I

P₀ = 0.643W

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