what is an accretion disk, and what are its characteristics? select the true statements regarding accretion disks.

The time needed for the current to reach a fraction f = 0.9 of its maximum value is approximately 0.0066 seconds.

i(t) = (V/R) * (1 - e^(-Rt/L)) = 0.9 * (V/R)

Simplifying this equation, we get:

1 - e^(-Rt/L) = 0.9

e^(-Rt/L) = 0.1

Taking the natural logarithm of both sides, we get:

-Rt/L = ln(0.1)

Solving for t, we have:

t = -L/R * ln(0.1)

Substituting the values given in the problem, we get:

t = -1.6 H / (1.9 kΩ) * ln(0.1) ≈ 0.0066 s

Inductance is a fundamental concept in physics that describes the ability of a circuit or device to resist changes in current. It is the property of an electrical conductor that opposes any change in the flow of electric current in the conductor. Inductance is measured in units called henries (H) and is represented by the symbol "L."

Inductance arises due to the magnetic field created by an electric current flowing through a conductor. When the current changes, the magnetic field also changes, and this causes an electromotive force (EMF) to be induced in the conductor. This EMF opposes the change in current and is proportional to the rate of change of current.

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The position of the image relative to the mirror v = 20cm, position of the image behind the mirror.

Since object is always placed in front of the mirror

Hence, object distance will be negative

Object distance (u) = - 100cm

Focus of a convex mirror is behind the mirror

Hence focal length will be positive

Focal length (f)= + 25cm

Find position of the image

Let the image distance = v

Using formula,

\(\frac{1}{v}\) +\(\frac{1}{u}\) = \(\frac{1}{f}\)

\(\frac{1}{v}\) = \(\frac{1}{f} - \frac{1}{u}\)

\(\frac{1}{v} = \frac{1}{25} - \frac{1}{-100}\)

\(\frac{1}{v} = \frac{1}{25} + \frac{1}{100}\)

\(\frac{1}{v} = \frac{4 + 1}{100}\)

\(\frac{1}{v} = \frac{5}{100}\)

v = \(\frac{100}{5}\)

v = 20cm

Since v is positive

Hence, image is 20cm behind the mirror

Nature of image is Virtual and erect.

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The mass of the other star in the binary system is approximately 0.541 solar masses.

To find the mass of the other star in the binary system, we can use Kepler's Third Law of Planetary Motion, which can be applied to binary star systems. The law states that the square of the orbital period (\(T\)) is proportional to the cube of the semi-major axis (\(a\)) of the orbit. Mathematically, this can be expressed as\(\(T^2 = \frac{4\pi^2}{G(M_1 + M_2)}a^3\), where \(M_1\) and \(M_2\)\)  are the masses of the stars,\(\(G\)\) is the gravitational constant, and other variables have their usual meanings.

Given that one star has a mass of 1.00 solar masses, we can substitute the known values into the equation and solve for\(\(M_2\)\). Rearranging the equation, we have\(\(M_2 = \frac{4\pi^2}{G}(\frac{a^3}{T^2}) - M_1\)\).

Plugging in the values for\(\(a\) (1.34E+10 km) and \(T\) (400 years)\), and using the appropriate unit conversions, we can calculate the mass of the other star,\(\(M_2\\), to be approximately 0.541 solar masses.

Therefore, the mass of the other star in the binary system is approximately 0.541 solar masses.

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Answer:

20 kg

Explanation:

Momentum = mv  =

   200 = m * 10

    m = 20 kg

Answer:

Moving electrons by cringing the object near another charged object ... This means that there is a different number of protons and electrons ... the attraction or repulsive electrostatic force between positive and negative charges ... the amount of charge on the particle and the distance between the particles ... fixed in position.ation:

To determine the number of electrons transferred to the charge generator, we can use the equation Q = ne, where Q is the charge, n is the number of electrons, and e is the elementary charge.

Given that the charge Q = -7.00 uC (microcoulombs) and the elementary charge e = 1.60 x 10^-19 C, we can rearrange the equation to solve for n:

n = Q / e

Substituting the given values:

n = (-7.00 x 10^-6 C) / (1.60 x 10^-19 C)

n ≈ -4.38 x 10^13

The negative sign indicates that electrons are transferred to the charge generator. Therefore, the number of electrons transferred during this process is approximately 4.38 x 10^13 (option d).

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Answer:

chlorine is a non-metal.

Explanation:

a chlorine atom has 7 electrons in its outer shell. chlorine is in group 7 of the periodic table. two chlorine atoms will each share one electron to get a full outer shell and form a stable cl2 molecule.

The slip at maximum torque is 0.0141,  the input current at maximum torque is 2.819 A, and the power factor at maximum torque is 0.9992, the maximum torque is 229.4 Nm and the resistance that must be added is 0.0031 ohm.

To calculate the values requested for the given motor, we will use the following formulas:

(a) Slip at maximum torque:

The slip at maximum torque can be calculated using the formula:

Slip at maximum torque (s_max) = (R1 + R'2) / (sqrt(R1^2 + (Xeq + Xm)^2))

Given:

R1 = 0.225 ohm

R'2 = 0.235 ohm

Xeq = 1.43 ohm

Xm = 31.8 ohm

Substituting the values into the formula, we get:

s_max = (0.225 + 0.235) / sqrt(0.225^2 + (1.43 + 31.8)^2)

     = 0.46 / sqrt(0.050625 + 1030.4929)

     ≈ 0.0141

Therefore, the slip at maximum torque is approximately 0.0141.

(b) Input current and power factor at maximum torque:

To calculate the input current and power factor at maximum torque, we need to use the concept of the Thevenin equivalent circuit.

Thevenin equivalent parameters:

Vth = 2200 V

Rth = (R1 || R'2) + Rm

Zth = Rth + jXeq

Where "||" denotes parallel resistance.

First, let's calculate Rth:

Rth = (R1 || R'2) + Rm

    = (0.225 * 0.235) / (0.225 + 0.235) + 780

    ≈ 779.8 ohm

Now, let's calculate Zth:

Zth = Rth + jXeq

    = 779.8 + j1.43

    ≈ 779.8 + j1.43 ohm

The input current (Iin) can be calculated as:

Iin = Vth / |Zth|

    = 2200 / |779.8 + j1.43|

    ≈ 2200 / 779.9

    ≈ 2.819 A

The power factor (PF) can be calculated as the cosine of the angle of Zth:

PF = cos(angle(Zth))

  = cos(arctan(1.43 / 779.8))

  ≈ 0.9992

Therefore, the input current at maximum torque is approximately 2.819 A, and the power factor at maximum torque is approximately 0.9992.

(c) Maximum torque:

The maximum torque (T_max) can be calculated using the formula:

T_max = (3 * Vth^2 * R'2) / (ωs_max * (Rth + R'2)^2)

Where ω is the angular frequency (2πf) and f is the frequency.

Given:

Vth = 2200 V

R'2 = 0.235 ohm

Rth = 779.8 ohm

s_max = 0.0141

f = 60 Hz

Substituting the values into the formula, we get:

T_max = (3 * 2200^2 * 0.235) / (2π * 60 * 0.0141 * (779.8 + 0.235)^2)

      ≈ 229.4 Nm

Therefore, the maximum torque is approximately 229.4 Nm.

(d) To achieve maximum torque at starting, the rotor resistance (R'2) needs to be increased. The additional resistance required (R_add) can be calculated using the formula:

R_add = (s_max * R1) / (1 - s_max)

where s_max is the slip at maximum torque.

Given:

R1 = 0.225 ohm

s_max = 0.0141

Substituting the values into the formula, we get:

R_add = (0.0141 * 0.225) / (1 - 0.0141)

      ≈ 0.0031 ohm

Therefore, the resistance that must be added to the rotor windings (per phase) to achieve maximum torque at starting is approximately 0.0031 ohm.

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The sprinter's changing speed, as well as the speed of any other moving object or person, is displayed on a velocity-time graph. The slope of the graph line on a velocity-time graph is used to represent acceleration.

Velocity's rate of change with time, both in terms of speed and direction. A point or object going straight ahead is accelerated when it accelerates or decelerates. m/s2 is the unit of acceleration. The term "constant acceleration" refers to the pace at which a particle's velocity changes.

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the woofer must generate a larger displacement amplitude than the tweeter in a speaker.

We can set the input powers equal by saying I tweeter = I woofer if the tweeter in a speaker produces the same amount of power at 5 KHz as the woofer does at 50 Hz. When we enter the values, we obtain:

(2 * pi * 5 * 103) * 1/2 * density * v

2 * Dm tweeter = 2 * pi * 50 * density * v * half

Dm woofer, 2 *

By dividing the two sides by the following formula:

(2 * pi * 5 * 10^3)

(2 * pi * 50)*(2 * Dm tweeter)*(2 * Dm woofer)

When both sides are squared:

Dm tweeter = 2 * pi * 50 * Dm woofer = 2 * pi * 5 * 103

If we multiply both sides by 2 * pi, we obtain:

50 * Dm woofer = 5 * 103 * Dm tweeter

When we divide both sides by 5 * 103, we obtain:

Dm woofer / 100 = Dm tweeter

In order to do this, the woofer needs to provide more displacement amplitude than the tweeter.

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Saturn is a planet in solar system. It's ring is made out of small covered ice particle. It has over 30 moons.

Answer:

umm the lower the frequency the higher the pitch

Explanation:

The strength of the magnetic field required to exactly balance the weight of the proton and keep it moving horizontally is 0.0414 T.

To balance the weight of the proton and keep it moving horizontally, we need to apply a magnetic field with a strength equal to the gravitational force acting on the proton.

The force experienced by a charged particle moving in a magnetic field is given by the formula:

F = q * v * B

where:

F is the magnetic force,

q is the charge of the particle,

v is the velocity of the particle, and

B is the magnetic field strength.

The weight of the proton is given by the formula:

Weight = mass * acceleration due to gravity

Since the proton is moving horizontally, the gravitational force is balanced by the magnetic force. Therefore:

F = Weight

q * v * B = mass * acceleration due to gravity

Given the following constants:

charge of a proton (q) = 1.6 x 10⁻¹⁹ C,

mass of a proton (mass) = 1.67 x 10⁻²⁷ kg

acceleration due to gravity (g) = 9.8 m/s².

Substituting the known values into the equation, we can solve for the magnetic field strength (B):

B = (mass * gravitational acceleration) / (q * v)

B = (1.67 x 10⁻²⁷ kg * 9.8 m/s²) / (1.6 x 10⁻¹⁹ C * 2.50 x 10⁶ m/s)

B = 0.0414 T

Therefore, the strength of the magnetic field required to exactly balance the weight of the proton and keep it moving horizontally is approximately 0.0414 Tesla (T).

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Answer:

Approximately \(2.69\; {\rm A}\).

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).

Electric current \(I\) is the rate of flow of electric charge.

In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:

\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).

Answer:

your girl is very very very very very very very pretty

Answer:

very very pretty

Explanation:

Yhe main difference between the two is that digital radio doesn't send complete information all at once

The car has a negative acceleration of 4.17 m/s². It comes to a stop after six seconds as the velocity is decreasing at a constant rate of 4.17 m/s every second.

A car comes to a stop six seconds after the driver applies the brakes.

While the brakes are on, the following velocities are recorded:

Initial velocity, u = 25 m/sFinal velocity, v = 0 m/sTime, t = 6 s

Average acceleration, a can be calculated by the equation: a = (v - u) / t.

Therefore, substituting the values gives us:a = (0 - 25) / 6 = -4.17 m/s².

Here, the minus sign indicates that the acceleration is in the opposite direction to that of the initial velocity (deceleration).

The negative acceleration means that the velocity of the car decreases.

Therefore, the car's velocity is decreasing by 4.17 m/s every second. Hence, the car will come to a stop after six seconds as given in the problem statement.

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The skier will move up the incline 4.65 meters before she momentarily stops, ignoring friction.

To solve this problem, we can use the principle of conservation of energy, which states that the total energy of a system remains constant as long as no work is done on it. At the bottom of the incline, the skier has kinetic energy due to her motion, but no potential energy. As she moves up the incline, her kinetic energy is converted into potential energy due to gravity.

The potential energy of an object of mass m at a height h above the ground is given by the formula P.E. = mgh, where g is the acceleration due to gravity (9.8 m/s^2). At the top of the incline, the skier will have no kinetic energy and all of her initial kinetic energy will have been converted to potential energy.

We can use the conservation of energy principle to set the initial kinetic energy equal to the final potential energy:

1/2 mv^2 = mgh

where m is the mass of the skier, v is her initial velocity, h is the height she reaches before stopping, and g is the acceleration due to gravity.

We can solve for h by rearranging the equation:

h = (1/2 v^2)/(g sin^2θ)

where θ is the angle of the incline. Substituting in the given values, we get:

h = (1/2 x 4.83^2)/(9.8 x sin^2 17.9°) = 4.65 meters

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The electrical potential energy U of this system is option D) U = 7q² / (a² 4πϵ0) J.The charges q, 3q, and -q are held at a distance a away from each other, forming an equilateral triangle.

The electric potential energy U of this system can be calculated as,

The electrical potential energy U = 3kq (q + 3q + (-q)) / 2aJ.

As the triangle is equilateral, the distance between each pair of charges is also equal to a.So, U = 3kq (3q) / 2aJ ⇒ U = 9kq² / 2aJ.

We know that k = 1/4πϵ0.

So, U = (9q² / 8πϵ0) * (1 / a) J.

For equilateral triangle, L = a + a + a = 3a.

Hence, electric potential energy U = (q² / 4πϵ0) * (3a) = 3q² / 4πϵ0 * a J.

So, the electrical potential energy U of this system is option D) U = 7q² / (a² 4πϵ0) J.

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According to Sigmund Freud, unconscious mental processes occur without a person being aware of them.

These mental processes refer to thoughts, desires, and memories that are inaccessible to conscious awareness. Freud believed that the unconscious mind played a crucial role in shaping human behavior and experiences. He argued that unresolved conflicts, repressed memories, and unconscious desires influence our thoughts, emotions, and behaviors, often without our conscious awareness.

Freud developed psychoanalysis as a method to bring these unconscious processes into conscious awareness through techniques such as dream analysis, free association, and interpretation of slips of the tongue. By exploring the unconscious, individuals can gain insight into their motivations and find resolution for psychological issues.

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The height of the cylinder is manipulated. This is the  variable -independent.

The quantities of carbon dioxide, methane, and nitrous oxide in the earth's atmosphere are higher currently than they have ever been in the previous 800,000 years. The earth's surface temperature has grown as a result of these greenhouse gas emissions and the greenhouse effect.

Water can turn into ice if it is sufficiently chilled. Ice can turn into liquid water if heated sufficiently. The molecules move more quickly when something is heated. The molecules of a substance move more slowly as it is cooled.

Heat waves can be deadly, resulting in conditions like heat cramps and heat stroke as well as actual mortality. Increased global warming has the potential to trigger a variety of other impacts. This is due to the fact that rising air temperatures also have an impact on vegetation, weather patterns, snow and ice, and oceans.

The temperature of the water changes as the height of the cylinder changes. The temperature of the water is therefore the  variable -dependent

A “constant” is a parameter that stays the same regardless of the variables. One parameter of the system that is held constant is the .mass of cylinder

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The acceleration of the car and the time required to reach this speed will be 8 m/s² and 10 sec.

The rate of velocity change concerning time is known as acceleration.

Given data;

Initial velocity, u=0  m/s

Final velocity, v= 80 m/sec

Distance travelled,s =900m

From Newton's third equation of motion;

v²=u²+2as

a =(v²-u²)/2s

Substitute the given values;

a = (80²-0)/2 ×900

a = 6400/1800

a=8 m/s²

The time required to reach this speed is found in Newton's first equation of motion as;

v = u+at

Substitute the given values;

80 = 0 + 8t

t=80/8

t = 10 sec

Hence, the acceleration of the car and the time required to reach this speed will be 8 m/s² and 10 sec.

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Answer:

1. Newtons first law (everything in motion/rest stays in motion/rest untill acted up by and unbalanced force).

2. Newtons third law (every reaction has an equal and opposite reaction)

Explanation:

Answer:

There are actually three, Kepler's laws that is, of planetary motion: 1) every planet's orbit is an ellipse with the Sun at a focus; 2) a line joining the Sun and a planet sweeps out equal areas in equal times; and 3) the square of a planet's orbital period is proportional to the cube of the semi-major axis of its

The magnitude of the electric dipole moment is 9.30 × 10⁻¹⁰ Cm.

A dipole is an electrically charged object with a positive charge at one end and a negative charge at the other end. The term "dipole" refers to the separation of electric charge, with the positive and negative charges being located at opposite ends of the object. Dipoles are a fundamental concept in the study of electric and magnetic fields and have many applications in physics, chemistry, and engineering. For example, a water molecule can be considered a dipole, with the positive end being the hydrogen atom and the negative end being the oxygen atom. Dipoles also play a crucial role in chemical bonding and molecular interactions.

The magnitude of the electric dipole moment (p) can be calculated using the formula:

p = Q * d

where Q is the magnitude of the charges and d is the separation between the charges.

Plugging in the given values:

p = 1.50 nC × 6.20  = 9.30 × 10⁻¹⁰ Cm

So, the magnitude of the electric dipole moment is 9.30 × 10⁻¹⁰ Cm.

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Answer:

Explanation:

A

Answer:

72 degrees

Explanation:

(14/70) * 360

=72

Answer:

A network has 5 basic components viz. clients, servers, channels, interface devices and operating systems.

All of the statements are correct and contribute to the reduction in intensity of radiation arriving at the surface when the sun angle is low.

When the sun angle is low, the radiation is spread out over a larger area when it hits obliquely. This means that the same amount of radiation is distributed over a larger surface area, resulting in a lower intensity of radiation per unit area.

In addition, the longer path diagonally down through the atmosphere means more of the energy is prevented from reaching the surface. The atmosphere absorbs and scatters some of the radiation, particularly at lower angles, resulting in less energy reaching the surface.

Finally, the sun is a bit farther from that part of the surface when it's rising or setting. This also contributes to the reduction in intensity of radiation arriving at the surface.

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Answer:

232 N

Explanation:

By Hooke's law, the force applied to a spring is proportional to the stretch of the spring, so

F = kx

Where F is the force, k is the spring constant and x is how much it is stretched.

So, replacing k by 58N/cm and x by 4 cm, we get

F = (58 N/cm)(4 cm)

F = 232 N

Therefore, the force applied is 232 N

Answer:

Explanation:

So:

(

5

⋅

1

)

+

(

1

⋅

−

4

)

=

(

5

+

1

)

v

5

−

4

=

6

v

v

=

1

6

=

0.17

m

s