(2 points) type i and type ii supernovae are respectively caused by what types of stars?

Answer: No

Explanation:

Whenever light travelling on a straight line encounters obstruction, it diffracts and scatter.

Scattering of light occurs when light passes through a rough path or a diffused surface.

But in case of spectral diffusion, which is the fluctuation in spectroscopy as a result of time dependent frequency shifts.

Spectral diffusion occurs in particular molecules initiated by excessive excitation energy.

Fluctuation in frequency does not mean diffraction of light or particles

Therefore, spectral diffusion does not cause light to scatter.

Betelgeuse is the 10th brightest star in the night sky comparing to other stars. And it is the second brightest in Orion's constellation.

Betelgeuse is the tenth brightest star in the night sky and, after Rigel, the second brightest in Orion's constellation. it is a distinctly reddish semiregular variable star with the widest apparent magnitude range of any first-magnitude star, ranging from +0.0 to +1.6. Betelgeuse is the brightest star in the night sky at near - infrared wavelengths. Its Bayer name is Orionis, which is Latinized to alpha Orionis and abbreviated alpha Ori or Ori

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The Productivity Index (PI) of the well is 2 psi/bbl per day. This indicates the efficiency of the well in delivering fluids from the reservoir to the wellbore.

The Productivity Index (PI) is a measure of the well's ability to deliver fluids from the reservoir to the wellbore. It is calculated by dividing the difference between the reservoir pressure and the flowing bottomhole pressure by the production rate. In this case, the reservoir pressure is given as 3,000 psi, and the flowing bottomhole pressure is measured at 2,990 psi. The production rate is 5 barrels per day.

For calculating the PI, use the formula:

PI = (Reservoir Pressure - Flowing Bottomhole Pressure) / Production Rate

Substituting the given values into the formula:

PI = (3,000 psi - 2,990 psi) / 5 bbls per day

Simplifying the equation:

PI = 10 psi / 5 bbls per day

PI = 2 psi/bbl per day

Therefore, the Productivity Index (PI) of the well is 2 psi/bbl per day. This indicates the efficiency of the well in delivering fluids from the reservoir to the wellbore.

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Answer :B: Bulbs B and C will remain lit.

If the switch is closed and Bulb A is removed, Bulbs B and C will remain lit. Option B is correct.

An electric bulb is a gadget that uses electricity to create visible light. It is the most popular type of artificial lighting and is necessary for modern society.

The light bulb is connected to a switch in a parallel configuration. The switch is open, which means there will be a lot of resistance and no current will flow via this route.

Across the parallel connection, the battery would create the same potential difference. Because the current would not go via the open switch, it would instead flow through the light bulb, causing it to illuminate.

If the switch is closed, the circuit get completed, hence the current starts flowing in the circuit and the bulb start glowing.

When one bulb in a series circuit is removed out, the rest of the bulbs stop shining and shut off.

But if bulb A is removed,in that condition the only connected bulb can glow. If the switch is closed and Bulb A is removed, Bulbs B and C will remain lit.

Hence, option B is correct.

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Notice that 40.35 is 5 times the half-life of 8.07 days. So in this time, the starting amount x of the sample was halved 5 times until 25 g of it were left, meaning

x/2⁵ = 25 g

Solve for x :

x = 2⁵ • (25 g) = 800 g

The mean free path where commercial aircraft fly (about 30,000 ft) is nearest 0.0076 mm. (A)

The mean free path is the average distance a molecule can travel before it collides with other molecules in the atmosphere. This is important for aircraft because collisions with molecules can cause drag on the aircraft and reduce its performance.

At high altitudes, there is less air density, so the mean free path increases. At 30,000 ft, the mean free path is around 0.0076 mm, which is the closest answer to the given options.

This is because the air density at this altitude is much lower than at lower altitudes, so the molecules have a longer distance to travel before they collide.

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Answer:

D-A radiator emitting warm air and drawing in cool air

Explanation:

Power will treble with an increase in voltage. The current (or flow of electrons) will rise in direct proportion to the voltage (or electrical pressure) in a circuit; for example, doubling the voltage will result in a doubling of the current flow. Thus, option D is correct.

The voltage and resistance in a circuit that prevent current flow determine how many current flows through it. Similar to voltage, resistance is a number that depends on two locations.

According to Ohm's law, the voltage (V) and resistance (R) in a circuit are both inversely correlated with the electrical current (I) that flows through the circuit (R). Since the resistance of the circuit remains constant, if the voltage is raised, the current will rise as well.

Therefore, current would increase in the power source.

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The boiling point of ethanol will be 78.85 °C.

This can be calculated using Clausius-Clapeyron equation, which is:

\(ΔHvap / Tb = ΔSvap / R\) ,

where \(ΔHvap\) is the heat of vaporization, \(ΔSvap\) is the entropy of vaporization, \(Tb\) is the boiling point in Kelvin, and \(R\) is the gas constant.

Plugging in the values given, we can solve for \(Tb\):

\(Tb = ΔHvap / (ΔSvap / R) = (38.6 kJ/mol) / (110 J/mol K) / (8.314 J/mol K)\)

\(Tb = 351 K\)

Converting to Celsius:

Tb (°C) = Tb (K) - 273.15 = 351 K - 273.15 = 78.85 °C

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Answer:

Friction is a force that resists the relative motion of two bodies in direct contact, such as the box and the carpet.

Answer:

B. Cant stop things from going wrong.

Explanation:

To me it's the only reasonable answer...

The length and orientation of the road in a frame of reference that is moving with the given velocity  in a direction making an angle of 30 degrees with the road is calculated to be 2.641 meters and  16.83 degrees respectively.

Let's first calculate the velocity of the road in the frame of reference that is moving with a velocity of 0.6c. We can use the velocity addition formula to calculate this:

v' = (v - u) / (1 - uv/c²)

where

v = velocity of the road

u = velocity of the frame of reference = 0.6c

c = speed of light

Since the road is at rest in its own frame of reference, v = 0. Substituting the values, we get:

v' = (-0.6c) / (1 - 0.6c × 0 / c²)

v' = -0.8824c

The negative sign indicates that the road appears to be moving in the opposite direction in the moving frame of reference.

Now, let's calculate the length of the road in the moving frame of reference. We can use the length contraction formula to calculate this:

L' = L × √(1 - v'²/c²)

where

L = length of the road

v' = velocity of the road in the moving frame of reference

Substituting the values, we get:

L' = 5 × √(1 - (-0.8824c)²/c²)

L' = 2.641 meters

Therefore, the length of the road in the moving frame of reference is 2.641 meters.

Finally, let's calculate the orientation of the road in the moving frame of reference. We are given that the direction of the velocity of the frame of reference makes an angle of 30 degrees with the road. We can use the following formula to calculate the angle between the road and the velocity of the frame of reference in the moving frame of reference:

tan(e') = (tan(e) - u/c) / (1 - u×tan(e)/c)

where

e = angle between the road and the velocity of the frame of reference

u = velocity of the frame of reference = 0.6c

e' = angle between the road and the velocity of the frame of reference in the moving frame of reference

Substituting the values, we get:

tan(e') = (tan(30) - 0.6c/c) / (1 - 0.6c×tan(30)/c)

tan(e') = 0.294

Taking the inverse tangent, we get:

e' = 16.83 degrees

Therefore, the orientation of the road in the moving frame of reference is 16.83 degrees and the length of the road in the moving frame of reference is 2.641 meters.

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The complete question is :

Given a road of length 5 meters, calculate the length and orientation of the road in a frame of reference that is moving with a velocity of 0.6c in a direction making an angle of 30 degrees with the road.

The picture position travels away from the mirror as the object approaches it, and the image size increases (but the image is still inverted).

A force pushing or pulling an object will cause it to move in that direction. The acceleration increases as the force and object weight increase. Moreover, it can cause something to shift pace, direction, or tempo.

The primary forces that produce motion are gravity and friction. The motion of an object will change if one, both, or both forces are changed. The force that draws two objects together is called gravity. The amount of "stuff" in an object, or its mass, is the same for everything.

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For the particle with the position function r(t) = ⟨\(t^{2}\)+t,\(t^{2}\)−t,\(7t^{3}\)⟩, the velocity is ⟨2t+1,2t-1,\(21t^{2}\)⟩, the acceleration is ⟨2,2,42t⟩, and the speed is √(\((2t+1)^{2}\) + \((2t-1)^{2}\) + \((21t^{2})^{2}\).

To find the velocity, acceleration, and speed of the particle, we need to differentiate the position function with respect to time.

Given the position function r(t) = ⟨\(t^{2}\)+t,\(t^{2}\)−t,\(7t^{3}\)⟩, we can differentiate it to find the velocity function v(t):

v(t) = r'(t) = ⟨2t+1,2t-1,\(21t^{2}\)⟩.

Thus, the velocity of the particle is given by ⟨2t+1,2t-1,\(21t^{2}\)⟩.

To find the acceleration, we differentiate the velocity function v(t):

a(t) = v'(t) = ⟨2,2,42t⟩.

Hence, the acceleration of the particle is ⟨2,2,42t⟩.

Finally, the speed of the particle is the magnitude of the velocity vector, which can be calculated as follows:

speed = √(\((2t+1)^{2}\) + \((2t-1)^{2}\) + \((21t^{2})^{2}\).

Therefore, the velocity of the particle is ⟨2t+1,2t-1,\(21t^{2}\)⟩, the acceleration is ⟨2,2,42t⟩, and the speed is √(\((2t+1)^{2}\) + \((2t-1)^{2}\) + \((21t^{2})^{2}\).

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Answer:

periscope, an optical instrument used in land and sea warfare, submarine navigation, and elsewhere to enable an observer to see his surroundings while remaining under cover, behind armor, or submerged.

Explanation:

Step index fibres have refractive indices of 1.45 for the cladding and 1.46 for the core. The pulse dispersion caused by the numerical aperture alone is measured in ns/km.

For TIR to occur, the core should have a higher refractive index than the cladding since TIR only occurs when light moves from a denser to a rarer medium.

The part of the fibre that carries light is called the core. The core is encircled by the cladding. A substance with a slightly lower index of refraction than the core makes up the cladding. Whole internal reflection takes place at the core-cladding boundary as a result of this discrepancy in the indices.

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Answer:

When several resistors are connected in series, the total resistance equals the sum of the individual resistors. In series combination, the current is same through each resistor.

1)   V=  60 volt

Total resistance R = R₁ + R₂

                              = 20 + 10

                              = 30 Ω

2) Ohms law states that,

           \(\sf I =\dfrac{V}{R}\\\\\\I = \dfrac{60}{30}\\\\I = 2 \ A\)

3) Voltage around 10 Ω resistor,

          V₂ = I R₂

             = 2 * 10

              = 20 volt

___________________________________________________

4) Total current = 1 A

5) Total voltage = 8 volt

6) Voltage around R₁ is V₁

              R₁ = 2 Ω  ; I = 1 A

              V₁ = IR₁

                   = 1 * 2

                   = 2 volt

7) Resistance 2:

        Total resistance = R

        Total voltage = V = 8 volt

        Total current = I = 1 A

                  \(\sf R = \dfrac{V}{I}\\\\\\ R = \dfrac{8}{1}\\\\\)

                  R = 8 Ω

               R₁ + R₂ = 8 Ω

                2 + R₂ = 8

                      R₂  = 8 - 2

                      R₂ = 6 Ω

8)Voltage around R₂:

                  \(\sf V_2 = IR_2\\\\V_2 = 1*6\\\\\)

                  V₂ = 6 volt

9) Total R = 8 Ω

_________________________________________________

10) Total V = 12 volt

11)  Total R = 8 + 8

                 = 16 Ω

12) Total current I,

                \(\sf I = \dfrac{V}{R}\\\\I = \dfrac{12}{16}\\\\I = 0.75 \ A\)

13) Voltage at each resistor:

           V₁ = I*R₁

               = 0.75 * 8

               = 6 volt

         V₂ = I*R₂

              = 0.75 * 8

             = 6 volt

_______________________________________________________

     14) Total R =   40 + 20

                       = 60 Ω  

15) To find V₁, first find total voltage.

           I = 2 A ;  R = 60 Ω  

           V = IR    

              = 2 * 60

               = 120 V

        V₁ + V₂  =V

        V₁ + 80 = 120

                V₁ = 120 - 80

                 V₁ = 40 volt              

Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago.

A certain ammeter has a resistance of zero on a scale which reads up to a certain maximum value.

This means that the ammeter has the ability to conduct a large amount of electrical current without any resistance whatsoever. This is an important feature of an ammeter, as it allows for accurate measurements of electrical current in circuits, without the added resistance of the ammeter itself. By having a resistance of zero, the ammeter is able to accurately measure the amount of current flowing through the circuit without any interference.

The reading on the ammeter is also unaffected by any changes in the electrical current, as the resistance of the ammeter remains at zero regardless of the changes in the current. This ensures that the ammeter can provide reliable and accurate readings, regardless of the current flowing through the circuit.

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Correct question is :

a certain ammeter has a resistance of on a scale which reads up to ____.

The principle of conservation of energy states that in a closed system, where no work is done by non conservative forces, the total mechanical energy remains constant (option B).

This means that the sum of kinetic energy and potential energy within the system does not change over time.

In this context, option b is the correct choice, as it states that the total mechanical energy is constant. The other options are not accurate because they focus on individual aspects of energy (kinetic, potential, or power) remaining constant, rather than considering the total mechanical energy of the system. Hence, the correct answer is Option B.

To clarify, in a system where only conservative forces act, energy can be transformed between kinetic and potential forms without any net loss or gain. For example, when an object is lifted against gravity, its kinetic energy decreases while its potential energy increases, keeping the total mechanical energy constant. Similarly, as the object falls, its potential energy decreases while its kinetic energy increases, maintaining the conservation of energy principle. This principle is fundamental in understanding various physical phenomena and plays a crucial role in problem-solving within physics.

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Answer:

it would be coal

Explanation:

coal is the most used energy source in many countries as of China , India and, the United States

Coal is a primary energy source used by power plants to generate electricity

Electricity generation plants convert the chemical energy of fuel into electricity. Coal, oil, natural gas and nuclear fuels are the energy sources most commonly used for generating electricity.

"Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests."

"A fundamental form of energy observable in positive and negative forms that occurs naturally (as in lightning) or is produced (as in a generator) and that is expressed in terms of the movement and interaction of electrons. "

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The force of gravity can more easily overcome the force of friction if the ramp is steep. Obviously, gravity causes an object on an incline to move faster down the slope than an object on a flat slope. Because of the increased height, falling takes longer.

Hence, The force of gravity can more easily overcome the force of friction if the ramp is steep.

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A) The electric field at 1.0 cm above the center of the sheet is 2.5 × 10⁵ N/C, B) the electric field 15 m above the center of the sheet is 11 N/C.

Side of the square sheet, l =25 cm = 0.25 m

Uniformly distributed charge, Q = 275 × 10⁻⁹ C

ε₀ = 8.8 × 10⁻¹²

a) When close to the sheet, we assume it as an infinite sheet, So,

E = σ/2ε₀,

σ = Q/l²

E = Q/(2ε₀l²)

E = (275 × 10⁻⁹)/(2×8.8 × 10⁻¹²×0.25²)

E = 2.5 × 10⁵ N/C

B) When far from the sheet, we assume it as a point charge, if R = 15 m

E = Q/(4πε₀R²)

E = (275 × 10⁻⁹)/(4π×8.8 × 10⁻¹²× 15²)

E = 11 N/C

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Nuclear Fusion is a process by which the nucleus of the two atoms fuses to form a completely new element. The Helium in the sun is produced by the process of nuclear fusion.

It is a process by which the nucleus of the two atoms fuses to form a completely new element.

For Example-

Therefore, the Helium in the sun is produced by the process of nuclear fusion.

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The best comparison is "The electromagnet with 40 coils will be stronger than the electromagnet with 20 coils." The correct option is D.

The strength of an electromagnet is directly proportional to the number of wire coils around its core. As such, an electromagnet with more wire coils will have a stronger magnetic field than one with fewer wire coils. In this case, the electromagnet with 40 wire coils will be stronger than the one with 20 wire coils.

Option A is not true because the strength of the electromagnet does not increase exactly in proportion to the number of wire coils. It depends on the core material, the amount of current flowing through the wire, and other factors.

Option B is not true because the number of wire coils directly affects the strength of the electromagnet, so the two electromagnets will not be equally strong.

Option C is not true because the electromagnet with fewer wire coils will be weaker than the one with more wire coils.

Therefore, The correct answer is option D.

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Answer:

2 miles

Explanation:

Answer:

Surface material/texture

Explanation:

Answer:Korotkoff Sounds. -tapping sounds created by turbulent blood flow in arm. -pressure is slowly being released from cuff, so systolic pressure is above that of the cuff, but diastolic is still below, so the artery opens in systole and collapses in diastole.

Explanation:

9,800 Newtons of pressure must be supported by the wire (N). T = m x a, where T is tension, m is the car's mass, and an is the velocity, can be utilized to compute that.

T=1400 kg x 0.70 m/s2.

T = 9,800 N

First, figure out how much force is needed to start the car moving.

Force = mass × accelerate

Force = 1400 kg × 0.70 m/s2

Force = 980 N

Step 2: Calculate the tension in the cable.

Tension = Force

Tension = 980 N

Consequently, to propel the vehicle vertically upwards towards a speed of 0.70 m/s2, the wire should endure a tension of 980 N.

A force which draws on something and extends it is known as tension in thermodynamics. This force can be applied across a thread, wire, cord, or even other media. Pulling apart of the medium's extremities causes it to decompress, which is the reverse of compression. To determine the tension in a media, divide the pressure acting on its endpoints by both the surface of its pass.

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Answer:

layers of cotton lining the interior

Explanation: