WILL GIVE BRAINLIST

brief history of coal. the inventors of who discovered coal and when was it first used.

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question

mass = 20 kg

velocity = 4 m/s

We have

momentum = 20 × 4 = 80

We have the final answer as

Hope this helps you

The amplified sound produced a clear, bright, and piercing sound that filled the auditorium.

Amplification involves using electronic equipment, such as microphones and speakers, to increase the volume and projection of sound.

The amplification process not only made the sound of the flute louder but also improved its clarity and brightness. The use of high-quality microphones and speakers can accurately reproduce the tonal qualities of the flute, allowing for a faithful representation of the instrument's sound.

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The full question is:

A student was preparing to perform a flute solo in an auditorium for the spring band concert. The teacher went to the back of the auditorium and discovered that the sound of the flute was going to need to be amplified for people in the back to hear the solo. The amplified sound produced ____________ that filled the auditorium.

Sound travels at approximately 343 meters (or 1,125 feet) per second in dry air at room temperature.

To determine how far away lightning is when thunder sounds 10 seconds after the lightning flash, we can use the speed of sound.

Distance = Speed × Time

Distance = 343 m/s × 10 s

Distance = 3,430 meters

Therefore, if thunder sounds 10 seconds after the lightning flash, the lightning is approximately 3,430 meters (or 3.43 kilometers) away.

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The right ventricle of the heart pumps oxygen-poor blood to the lungs. The correct answer is B.

This is because the right atrium receives oxygen-poor blood from the body and then passes it on to the right ventricle, which then pumps it to the lungs for oxygenation. Once the blood is oxygenated, it returns to the left side of the heart via the pulmonary vein, and the left ventricle then pumps the oxygen-rich blood to the body. The right ventricle of the heart pumps oxygen-poor blood to the lungs. In this process, the right ventricle receives oxygen-poor blood from the right atrium and pumps it into the pulmonary artery, which then transports the blood to the lungs to get oxygenated.

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A wave is a disturbance that travels from one point to another in a medium. This disturbance can also be referred to as variation in energy. Light consists of energy derived from oscillating magnetic and electric fields. As light moves, it carries this energy from the source to another location. Also, waves have frequency and wavelength. Given these characteristics of light, we can conclude that

light is a kind of wave

Displacement in a given time is called work done. The total amount of work done to lift the piano to the fifth floor of the building is 245.0245 kJ.

Explanation:

Given:

m = 1000 kg

g = 9.8 m/s²

h = 25 m

Work done against gravity:

The work done against gravity is given by the formula:

\(Work_{gravity}\) = mgh

where m is the mass, g is the acceleration due to gravity, and h is the height.

\(Work_{gravity}\) = 1000 kg × 9.8 m/s² × 25 m = 245000 J

Work done to lift additional cable:

The work done to lift the additional length of cable can be calculated using the formula:

\(Work_{cable}\) = force × distance

\(Work_{cable}\) = linear mass density × length

Given:

linear mass density = 0.1 kg/m (linear mass density of the cable)

length = 5 m (additional length of cable)

\(Work_{cable}\) = 0.1 kg/m × 5 m

= 0.5 kg

\(Work_{cable}\) = \(Weight_{cable}\) × g × h

\(Work_{cable}\) = \(0.5 kg \times 9.8 m/s^2 \times5 m\)

= 24.5 J

Total work done:

The total work done is the sum of the work done against gravity and the work done to lift the additional cable:

Total work = \(Work_{gravity}\) + \(Work_{cable\)

Total work = 245000 J + 24.5 J

= 245024.5 J

Total work = 245024.5 J / 1000

= 245.0245 kJ

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Answer:

this is the answer the required questions

hope you like this

The ratio of the distance between the foci and the length of the major axis in an ellipse is called:

C. the eccentricity.

The eccentricity of an ellipse is a measure of how elongated or stretched out the ellipse is. It is defined as the ratio of the distance between the foci (2c) to the length of the major axis (2a). Mathematically, the eccentricity (ε) is given by the formula:

ε = c / a

where c is the distance between the foci and a is the semi-major axis (half the length of the major axis).

The eccentricity value ranges between 0 and 1. A value of 0 represents a circle, where the foci coincide at the center. As the eccentricity increases towards 1, the ellipse becomes more elongated, and the foci move farther apart.

The ratio of the distance between the foci and the length of the major axis in an ellipse is known as the eccentricity. It is a fundamental parameter that characterizes the shape and elongation of an ellipse.

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Answer:

Momento = 170.8 Kgm/s

Explanation:

Dados los siguientes datos;

Masa = 3,05 kg

Velocidad = 56 m/s

Para encontrar el impulso;

El momento se puede definir como la multiplicación (producto) de la masa que posee un objeto y su velocidad. El momento se considera una cantidad vectorial porque tiene magnitud y dirección.

Matemáticamente, el momento viene dado por la fórmula;

\( Momento = masa * velocidad \)

Sustituyendo en la fórmula, tenemos;

\( Momento = 3.05 * 56 \)

Momento = 170.8 Kgm/s

The number of distinct values of resistance that can be made is five. So, option D. is correct.

1. Let's represent the resistance of each identical resistor as R.
2. Consider the possible combinations:
  a. No resistor connected:

This case doesn't contribute to a resistance value.
  b. One resistor connected:

The resistance value is R.
  c. Two resistors connected in series:

The resistance value is R + R = 2R.
  d. Two resistors connected in parallel:

The resistance value is (R * R) / (R + R) = R/2.
  e. Three resistors connected in series:

The resistance value is R + R + R = 3R.
  f. Three resistors connected in parallel:

The resistance value is (R * R * R) / (R * R + R * R + R * R) = R/3.
  g. One resistor in parallel with two resistors in series:

The resistance value is (R * (R + R)) / (R + (R + R)) = (2 * R) / 3.

3. Count the distinct resistance values: R, 2R, R/2, 3R, R/3, and (2 * R) / 3, which sums to a total of 5 different resistance values.

So, the correct answer is five distinct values of resistance can be made using three identical resistors in any combination. So, option D. is correct.

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Explanation:

If you place an electrically charged hair comb near bits of paper, the paper bits may be attracted to or repelled from the comb, depending on the charge of the comb and the bits of paper.

When you comb your hair with a plastic comb, the comb can pick up electrons from your hair, which gives the comb a negative charge. This negative charge can attract positively charged objects, such as small bits of paper or dust, to the comb.

On the other hand, if the comb has a positive charge, it can repel positively charged objects and attract negatively charged objects. So if the bits of paper have a negative charge, they may be repelled by the positively charged comb.

In either case, the attraction or repulsion would be relatively weak because the charge on a hair comb is typically small. However, it can still be a fun experiment to try!

The linear speed of the electron is 7.03 x 10¹³ m/s and the angular speed of the electron is 5.6 x 10¹³ rev/s.

The speed of the electron is calculated as follows;

F = ma = mv²/r  ---(1)

F = qvB  ----- (2)

mv²/r = qvB

mv/r = qB

mv = qBr

v = qBr/m

where;

v = (1.6 x 10⁻¹⁹ x 2 x 10³ x 0.2) / (9.1 x 10⁻³¹)

v = 7.03 x 10¹³ m/s

ω = v/r

ω = (7.03 x 10¹³ m/s) / (0.2 m) = 3.51 x 10¹⁴ rad/s

ω = 3.51 x 10¹⁴ rad/s  x 1 rev/2π rad

ω = 5.6 x 10¹³ rev/s

Thus, the linear speed of the electron is 7.03 x 10¹³ m/s and the angular speed of the electron is 5.6 x 10¹³ rev/s.

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Bodily injury due to slips and falls is considered a physical hazard from conditions involving: surface residues.

In general, injuries can be caused by:

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Answer:

Their common velocity after collision is 3.6 m/s

Explanation:

Given;

mass of the first meatball, m₁ = 3.0 kg

initial velocity of the first meatball, u₁ = 6.0 m/s

mass of the second meatball, m₂ = 2.0 kg

initial velocity of the first meatball, u₂ = 0 m/s

let their common velocity after collision = v

Apply the principle of conservation of linear momentum for inelastic collision ;

m₁u₁ + m₂u₂ = v(m₁ + m₂)

(3 x 6) + (2 x 0) = v( 3 + 2)

18 = 5v

v = 18 / 5

v = 3.6 m/s

Therefore, their common velocity after collision is 3.6 m/s

The thickness of insulation required to limit the heat flux through the composite wall to 60 W/m^2 in the case of gas free convection is approximately 17.998 m.

To determine the thickness of insulation required to limit the heat flux through the composite wall, we need to consider the different cases of heat transfer and use the appropriate convection heat transfer coefficient.

Let's calculate the thickness of insulation for each case:

1. Gas Free Convection (h = 5 W/m^2⋅K):

For this case, we can use the formula for one-dimensional heat conduction through a composite wall:

q = (T1 - T2) / (R_total)

where q is the heat flux, T1 is the temperature on one side of the wall, T2 is the temperature on the other side of the wall, and R_total is the total thermal resistance of the composite wall.

The total thermal resistance is given by:

R_total = R_insulation + R_ss1 + R_ss2

where R_insulation is the thermal resistance of the insulation, R_ss1 is the thermal resistance of the first stainless steel sheet, and R_ss2 is the thermal resistance of the second stainless steel sheet.

The thermal resistance can be calculated using the formula:

R = thickness / (k * A)

where R is the thermal resistance, thickness is the thickness of the material, k is the thermal conductivity, and A is the cross-sectional area of heat transfer.

Given:

k_ins = 1.5 W/m⋅K

k_ss = 15 W/m⋅K

Thickness of stainless steel sheets (ss): 1 mm = 0.001 m

Heat flux (q) = 60 W/m^2

T1 = 50°C

T2 = 25°C

h_gas_free_conv = 5 W/m^2⋅K

Let's calculate the thermal resistance for each layer:

R_ss1 = 0.001 m / (15 W/m⋅K * A)

R_ss2 = 0.001 m / (15 W/m⋅K * A)

R_insulation = x / (1.5 W/m⋅K * A)

Substituting these values into the equation for R_total, we get:

R_total = x / (1.5 W/m⋅K * A) + 0.001 m / (15 W/m⋅K * A) + 0.001 m / (15 W/m⋅K * A)

Now we can rearrange the equation for heat flux q and solve for the insulation thickness x:

x = q * (1.5 W/m⋅K * A) / (h_gas_free_conv * A) - 0.002 m

Substituting the given values, we have:

x = 60 W/m^2 * (1.5 W/m⋅K * A) / (5 W/m^2⋅K * A) - 0.002 m

Simplifying, we get:

x = 18 - 0.002 m

x ≈ 17.998 m

Therefore, the thickness of insulation required to limit the heat flux through the composite wall to 60 W/m^2 in the case of gas free convection is approximately 17.998 m.

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Answer:

Two examples of materials containing Bose-Einstein condensates are superconductors and superfluids. Superconductors conduct electricity with virtually zero electrical resistance: Once a current is started, it flows indefinitely. The liquid in a superfluid also flows forever.

Explanation:

Answer:

18N is the net force

Explanation:

Since friction always acts in the opposite direction of an objects motion we subtract the applied force from the frictional force to get our resultant net force of 18N.

The rate law is always the same with or without catalyst. The kinetic law for non-catalytic reactions is always different in the presence of a catalyst. The kinetic laws of catalytic reactions differ from non-catalytic reactions only when the catalyst is involved in the rate-limiting step.

Non-catalytic reactions proceed via a one-step mechanism (one transition state observed), whereas catalytic reactions follow a two-step mechanism, and the activation energy is significantly reduced. lower to

Catalysts are not consumed by reactions and can participate in multiple reactions at the same time. The only difference between catalytic and uncatalyzed reactions is the different activation energies. It has no effect on the energies of the reactants or products.

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Answer:

Jump from tallest building (Burj Khalifa) without any protection kit.

The size of the region responsible for powering an Active Galactic Nucleus (AGN) is typically c. Solar System size. This region, which includes the supermassive black hole and the surrounding accretion disk, has dimensions comparable to those of our Solar System.

First, it's important to understand what an AGN is. An AGN (Active Galactic Nucleus) is a compact region at the center of a galaxy that emits a tremendous amount of energy across the electromagnetic spectrum, from radio waves to gamma rays. The energy output of an AGN is believed to be powered by the accretion of matter onto a supermassive black hole at the center of the galaxy. As matter falls toward the black hole, it becomes heated and emits radiation before eventually crossing the event horizon and being swallowed by the black hole.


In summary, the size of the region responsible for powering an AGN is not a simple answer, but rather a complex question that depends on the specific AGN being observed and the method used to measure its size. While estimates can vary widely, the emission region of an AGN is typically much larger than the black hole itself but still relatively compact compared to the overall size of the galaxy, making "d. galaxy size" the most appropriate answer to this question.

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Answer:

if the thrust is increased