An object having a fixed emissivity of 0. 725 radiates heat at a rate of 10 w when it is at an absolute temperature t. If its temperature is doubled to 2t. At what rate will it now radiate?.

The self inductance can be calculated as 4.444 Henry.

The inductor will store energy = 20 joule,

current = 3 ampere.

     The current carrying conductor which allows or opposes the change of flow of current is known as self-inductance. The rate of change of current can also be given through self inductance.

Formula can be given  for the energy in the inductor as,

                      E = 1 / 2 × L × I² joule.

where as,    E - Energy

                    L - Inductance

                    I - Current flowing through the coil.

The equation can be rearranged as,

                      L =  2 E/ I²

                         =  2 × 20 / 3²

                         =  40 / 9

Hence,           L =  4.4444 Henry

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Reflection is the optical property of glass that allows this phenomenon.

Light can be carried along a distance within a transparent material by means of total internal reflection, with a minimum loss of amplitude.

(incident angle>critical angle light is reflected/bounces off)

When waves of light (and other electromagnetic radiation) come into contact with a surface or other boundary that does not absorb the radiation's energy, the waves bounce off the surface and back into space. The angle of incidence and angle of reflection are equal when light rays strike a flat surface, and the incident ray, the reflected ray, and the surface normal all lie in the same plane. There are three categories of reflection: glossy, specular, and diffuse.

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A particle moving at speed 0.32 c has momentum P₀. the speed of the particle is increased to 0.72 c then its momentum would be 2.25P₀.

It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.

Mathematically the formula of the momentum is

P = mv

where P is the momentum of the particle

m is the mass of the particle

v is the velocity by which the particle is moving

As given in the question a particle moving at speed 0.32 c has momentum P₀. the speed of the particle is increased to 0.72 c

by using the formula of the momentum and substituting the values of the velocity

P =mv

As mentioned in the question when the particle is moving with 0.32c velocity it has a momentum of P₀

P₀ = m*(0.32c)

If the speed of the particle is increased to 0.72 c the momentum would be

P=m*(0.72c)

by dividing the second equation from the first one

P₀/P = 0.32c/0.72c

P₀/P = 0.44

P =2.25P₀

Thus, the increased momentum of the particle would be 2.25P₀

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Answer:

The object with the greater mass will have the greater momentum

Explanation:

The momentum of an object with mass m, moving with velocity , is given by the formula

M = mv

Since both objects have the same velocity v, it is clear that the object with the bigger mass will have the greater momentum

Position the loop so that the field lines run perpendicular to the area vector or parallel to the surface so that there is no induced EMF in the loop

Magnetic Field is the region around a magnetic material or a moving electric charge within which the force of magnetism acts.

Flux is the presence of a force field in a specified physical medium, or the flow of energy through a surface. In electronics, the term applies to any electrostatic field and any magnetic field . Flux is depicted as "lines" in a plane that contains or intersects electric charge poles or magnetic poles.

As we all know that a moving charged particle will experience force by a magnetic field, the magnetic field produced by the field coil remains constant, that is, no force is experienced by electrons of the wire. So, we have to produce a relative motion between magnetic field and electrons.

Whenever the flux passing through the coil changes by any way (like either changing angle, magnetic field or area of coil), we are actually producing a relative motion between electrons and magnetic field. As a result, the electrons experience a magnetic force and shift to produce

flux =  [tex]\int\limits {BAcos(theta)} \,[/tex]

theta = angle between magnetic field and area

Since we know , EMF get induced only when flux changes , if their is no flux change , no EMF can be induced

Hence , in order to not induce any kind of EMF ,we need to maintain a constant flux , but in question it is a changing magnetic field which means changing flux ,in this situation we need to align a flat loop parallel to magnetic field so , their is zero flux through the loop .

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The magnitude of the magnetic field at the center of the loop is [tex]3.77*10^{-5} T[/tex]

Given,

μ0 = 4π × [tex]10^{-7}[/tex] t ∙ m/a, I=6 A, R = 10cm =0.1m

magnetic field(B)=μ0*I/2R=[tex]\frac{4*3.14*10x^{-7}*6 }{2*0.1}[/tex]=[tex]3.77*10^{-5} T[/tex]

When it comes to the magnetic influence on moving electric charges, electric currents, and magnetic materials, we use the vector field of a magnetic field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling in a magnetic field. Iron and other ferromagnetic elements are drawn to a permanent magnet's magnetic field, which also draws or repels other magnets. Furthermore, a magnetic field with varying localization will impose a force on a variety of non-magnetic materials by altering the velocity of their outer atomic electrons. Magnetic fields surround magnetised materials and are produced by electric currents, like those found in electromagnets, and by electric fields with changing time constants.

A circular loop of wire of radius 10 cm carries a current of 6. 0 a. what is the magnitude of the magnetic field at the center of the loop? (μ0 = 4π × 10-7 t ∙ m/a)

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The magnetic force is acting towards 2.

It is given that the diagram below shows a wire carrying a current between the poles of a large horseshoe magnet.

We need to determine in which direction does the magnetic force act on the wire.

We will use Fleming's left hand rule here.

It states that

If we arrange our thumb, forefinger and middle finger of the left-hand perpendicular to each other, then the thumb points towards the direction of the force experienced by the conductor, the forefinger points towards the direction of the magnetic field and the middle finger points.

According to this, the magnetic force is acting towards 2.

Option B is correct.

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The magnetic force is acting towards 2 direction. the correct answer is option(b).

An electric charge, an electric current, and magnetic materials are all affected magnetically by a magnetic field, which is a vector field. A force perpendicular to the magnetic field and its own velocity acts on a moving charge in a magnetic field. Given that the illustration below depicts a wire conducting a current between the poles of a sizable horseshoe magnet, it is assumed. We must ascertain the direction in which the magnetic force acts on the wire.

Here, the Fleming left-hand rule will be applied. The thumb, forefinger, and middle finger of the left hand are arranged perpendicular to one another, with the thumb pointing in the direction of the force experienced by the conductor and the forefinger and middle finger pointing in the direction of the magnetic field. This indicates that the magnetic force is pulling in the direction of 2.

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The total energy contained in 1 mol of photons is 109.75 KJ / mol

Given,

Frequency =  2.75 × 10 ^ 14 hz

We know that, Energy = Number of photons × Energy in one photon

                                      = n h v

                                      = (6.023 × 10^23) × ( 6.626 × 10^-34) ×( 2.75×10^14)

                                      =109.75 KJ/mol

Concepts

The total energy of a system is the sum of its gravitational potential and kinetic energy, and this total energy is preserved in orbital motion. To depart a planet and not return, objects should have a minimum velocity, known as the Escape Velocity

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Newton's reformulation of kepler's third law allows us to measure the masses of bodies in orbit around each other, if we can measure the distances and periods of revolution

Isaac Newton made a reformulation of the 3rd law of Kepler with regards to the orbital periods of a planet and this helped to measure the masses of bodies in orbit around each other, if we can measure the distances and periods of revolution

This refers to the law of physics that states that the square of the orbital periods of a planet is directly proportional to the cube of the semi-major axis of its orbit

Hence, there was a reformulation of the 3rd law of Kepler by Isaac Newton with regards to the orbital periods of a planet and this helped to measure the masses of bodies in orbit around each other, if we can measure the distances and periods of revolution

This shows that the distances and periods of revolution are key aspects to neasyre the  masses of bodies in orbit around each other,

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The resistivity of the material of a wire is 1. 76 × 10-8 ωm. if the diameter of the wire is 2 × 10-3 m and its length is 2 m, then its resistance is  0.0112Ω

The resistance of a wire is solely determined by its length, cross-section area, and resistivity. So we calculate the resistance of a wire by knowing its diameter, length, and resistivity (which varies depending on the material). The resistance provided by a unit length of conductor with a unit area of cross-section is defined as resistivity. Its SI unit is the ohm-meter.

It does not alter as the wire length increases, but resistance increases fourfold when the wire is stretched to double its original length. Resistivity is defined as the electrical resistance per unit length and cross-sectional area of a conductor.

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According to the Elements of Style, the telescope was set up on the tripod by the astronomy club.

To find the answer, we need to know about the revision.

Thus, we can conclude that, according to the Elements of Style, the telescope was set up on the tripod by the astronomy club.

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When the magnetic field is heading west and the electric field is pointing up, the wave propagation will be in the north.

How do we find out the direction of wave propagation?

Electromagnetic waves (EM-waves), as we are aware, are transverse. Electric and magnetic fields are both perpendicular to one another in EM waves (E⊥B).

Transverse waves are waves in which the propagation direction is opposite the direction of amplitude. for instance, gravitational waves, light waves, and water waves.

In this instance, the magnetic field is heading west while the electric current is pointing up towards the screen's layout.

∴ E x B = κ

where E= the direction of the electric field,

B = the direction of the magnetic field,

κ = at a particular point, the direction of propagation

The aforementioned equation is right-handed. When we put our finger towards ourselves (away from the screen) and curl it to the west, and the thumb will indicate the wave propagation direction ( north side ).

The propagation of waves in our instance is in the north direction.

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True. The component of the normal force on the object parallel to the plane balances the friction force on the object at rest.

An object placed on an inclined plane is subject to three forces, namely;

∑F = 0

mg sinθ   -  μFₙ cosθ = 0

mg sinθ = μFₙ cosθ

where;

Thus, the component of the normal force on the object parallel to the plane balances the friction force on the object at rest.

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The correct option is (c) reduced performance due to stereotype threat.

What is a culture of learning?

A culture of learning, or learning culture, is one in which employees continuously seek, share, and apply new knowledge and skills to improve individual and organizational performance.

How does culture affect learning?

Why is culture important in learning?

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The direction of current flow is given by an arrow in the electrical circuit.

Several categories are used to categorise electrical circuits. One-way current only flows through a direct-current circuit. As with most residential circuits, an alternating-current circuit is a channel for transmitting electrical current that pulses back and forth numerous times each second.

A battery or generator, a device that provides energy to the charged particles that make up the current, a device that uses current, such as a lamp, an electric motor, or a computer, and the connecting wires or transmission lines make up an electrical circuit.

A source of electrical power, two wires that can transmit current, and a light bulb make up an electrical circuit. Both wires have one end connected to a cell terminal and the other end connected to a light bulb. When the light bulb is turned off, the electrical circuit is disrupted.

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The inductance of a coil if the coil produces an emf of 2.50 v when the current in it changes from -28.0 ma to 25.0 ma in 12.0 ms is L   = 0.566 H

An inductor is a passive electronic component that stores energy in the form of a magnetic field. In its simplest form, an inductor consists of a wire loop or coil. The inductance is directly proportional to the number of turns in the coil.

The SI unit of inductance is Henry abbreviated as 'H'. It is defined as the measure of electric current changes at one ampere per second resulting in an electromotive force of one volt across the inductor.

The expression for induced emf

E=−L (di /dt)

L= E (dt / di )

di = 25 - ( -28) = 53 mA = 53 * [tex]10^{-3}[/tex]  A

dt = 12 ms = 12 *  [tex]10^{-3}[/tex] sec

E = 2.5 V

L = 2.5 ( 12 *  [tex]10^{-3}[/tex]  / 53 * [tex]10^{-3}[/tex] )

L   = 0.566 H

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In a transformer, energy is carried from the primary coil to the secondary coil by magnetic field in the iron core.

To find the answer, we have to know more about the transformer.

Thus, we can conclude that, in a transformer, energy is carried from the primary coil to the secondary coil by magnetic field in the iron core.

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Two vectors have magnitudes of 10 and 15. The angle between them when they are drawn with their tails at the same point is 65. The component of the longer vector along the line of the shorter is 6.33 .

A vector is a quantity or phenomenon that has two independent properties: magnitude and direction. The term also denotes the mathematical or geometrical representation of such a quantity. Examples of vectors in nature are velocity, momentum, force, electromagnetic fields, and weight.

The taller component will be 15 . There will be two components taller component , one in the direction of shorter component and other perpendicular to the shorter wavelength .

The component of longer wavelength in the direction of shorter will be  

= 15 cos (theta ) = 15 cos (65) = 6.33

where theta  is the angle between both the vectors

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9 × 10²¹ electrons flow through a cross section of the wire in one hour.

= 1440 C

= 9 × 10²¹ electrons

Thus, we can conclude that the 9 × 10²¹ electrons flow through a cross section of the wire in one hour.

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(a) The gravitational force received by each 1 kg mass is 8.66 N.

(b) The magnitude of gravitational acceleration is 8.66 m/s².

(c) The orbital speed of the ISS is  7,663.6 m/s.

(d) The time take  for the ISS to orbit round the Earth is 5,558.75 s = 1.54 hours.

The gravitational force received by each 1 kg mass is calculated as follows;

F = Gm₁m₂/r²

where;

F = (6.67 x 10⁻¹¹ x 5.97 x 10²⁴ x 1) / (6780,000)²

F = 8.66 N

mg = GMm/r²

g = GM/r²

where;

g = (6.67 x 10⁻¹¹ x 5.97 x 10²⁴ ) / (6780,000)²

g = 8.66 m/s²

v = √GM/r

v = √(6.67 x 10⁻¹¹ x 5.97 x 10²⁴  / 6780,000)

v = 7,663.6 m/s

T = 2πr/v

T = (2π x 6780,000) / (7663.6)

T = 5,558.75 seconds

1 hour = 3600 seconds

=  5,558.75/3600

= 1.54 hours

Thus, the gravitational force received by each 1 kg mass is 8.66 N.

The magnitude of gravitational acceleration is 8.66 m/s².

The orbital speed of the ISS is  7,663.6 m/s.

The time take  for the ISS to orbit round the Earth is 5,558.75 s = 1.54 hours.

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As additional resistors are included lined up across a consistent voltage source, there are more ways for current to take.

So more current spills out of the source, and the all out current provided by the source increments.

The power supplied by the battery is (voltage) x (current).  So if the voltage is constant and the current increases, the power being supplied must also increase.

A resistor is an electrical part that cutoff points or manages the progression of electrical flow in an electronic circuit. Resistors can likewise be utilized to give a particular voltage to a functioning gadget like a semiconductor.

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The solid cylinder reaches the bottom first.

A (solid) cylinder is a solid that has two parallel planes and a cylindrical surface surrounding it. An element of the cylinder is a line segment that is determined by an element of the cylindrical surface between two parallel planes. A cylinder's components are all the same length. The material's velocity would be higher if the moment of inertia was lower and the radius of gyration k was smaller. In comparison to a hollow cylinder with k as 1, a solid cylinder with k as 1/2 will move at a faster speed. Their energies at both levels, including potential energy and energy lost through friction, would stay the same because they had the same mass and radius.

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A solid cylinder and a hollow cylinder of the same mass and radius, both initially at rest, roll down the same inclined plane without slipping. Choose the correct options.

The solid cylinder reaches the bottom first.

A solid object will always roll down the ramp faster than a hollow object of the same shape regardless of their exact mass or diameter.

The solid cylinder has a lower moment of inertia than the hollow one does. Although they have the same mass, all the hollow cylinder's mass is concentrated around its outer edge so its moment of inertia is higher.

The velocity would be greater for the material with radius of gyration k is lower of for which the moment of inertia is lower. Solid cylinder with k as 1/2 will have greater velocity as compared to hollow cylinder which has k as 1. As they have same mass and radius their energies at both the levels would remains same including the potential energy and energy lost due to friction.

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The three most normal units of estimation for temperature are Celsius, Fahrenheit, and Kelvin.

A thermometer is an instrument that measures temperature. It can gauge the temperature of a strong, for example, food, fluid like water, or gas like air.

The Celsius scale is important for the decimal measuring standard. The decimal standard of estimation additionally incorporates units of mass, like kilograms, and units of length, like kilometers. Most logical fields measure temperature utilizing the Celsius scale. Zero degrees Celsius is the edge of freezing over water, and 100 degrees Celsius is the limit of water. Three countries don't utilize the Celsius scale. The United States, Burma, and Liberia utilize the Fahrenheit scale to quantify temperature. In any case, even in these nations, researchers utilize the Celsius or kelvin scale to gauge temperature. Water freezes at 32 degrees Fahrenheit and bubbles at 212 degrees Fahrenheit. The Kelvin scale is utilized by physicists and different researchers who need to record exceptionally exact temperatures. The Kelvin scale is the main unit of estimation to incorporate the temperature for "outright zero," the complete shortfall of any intensity energy.

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7718.04 J joules are required to convert 16. 5 g of ice at 0.0°C to liquid water at 32. 0°C

Specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degree.

Latent heat of fusion, also known as enthalpy of fusion, is the amount of energy that must be supplied to a solid substance (typically in the form of heat) in order to trigger a change in its physical state and convert it into a liquid (when the pressure of the environment is kept constant).

heat require to convert 16.5 g of ice at 0°C to water at 0°C

Q1 =  [tex]mH_{f}[/tex] = 16.5 * 334 = 5511 J

heat require to convert 0°C of water to water at 32. 0°C

Q2 = mcΔT = 16.5 * 4.18 *(32-0) = 2207.04 J

Total heat = Q1 + Q2

                 = 5511 J + 2207.04 J = 7718.04 J

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The bisecting-angle instrument (bai) uses aiming rings to determine the correct pid angulation.

This instrument is commonly used in dental medicine and radiography so as to achieve short cone technique x-rays.

It however employs the use of aiming rings for accuracy to determine the correct position-indicating device angulation thereby making it the most appropriate choice.

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When a metal is illuminated by light, photoelectrons are observed provided the light's wavelength is less than 669 nm. The work function will be 0.030 * [tex]10^{-17}[/tex] J

The work function (or work function) is defined as the minimum amount of thermodynamic work (i.e. energy) required to remove an electron from a solid to a point in the vacuum immediately outside the solid surface.

When light of suitable frequency falls on a metal surface, electrons are emitted. These photo (light) generated electrons are called photoelectrons

h = 6.62 x [tex]10^{-34}[/tex] J/Hz

c = 3 * [tex]10^{8}[/tex] m/s

lambda = 669 * [tex]10^{-9}[/tex] m

work function = h*c/lambda

                       = 6.62 x [tex]10^{-34}[/tex]  * 3 * [tex]10^{8}[/tex] /  669 * [tex]10^{-9}[/tex]

                       = 0.030 * [tex]10^{-17}[/tex] J

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The angle between two just-resolvable points of light for a 2. 75 mm diameter pupil in radians, assuming an average wavelength of 550 nm will be 2.44 * [tex]10^{-4}[/tex] radian

The limit of resolution (or resolving power) is a measure of the ability of the objective lens to separate in the image adjacent details that are present in the object. It is the distance between two points in the object that are just resolved in the image.

Resolving power is the capacity of an instrument to resolve two points which are close together.

theta = 1.22 * ( lambda / diameter )

          = 1.22 * ( 550 * [tex]10^{-9}[/tex] / 2.75 * [tex]10^{-3}[/tex] )

         = 244 * [tex]10^{-6}[/tex]

         = 2.44 * [tex]10^{-4}[/tex] radian

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Observe that the given vector field is a gradient field:

Let [tex]f(x,y,z)=\nabla g(x,y,z)[/tex], so that

[tex]\dfrac{\partial g}{\partial x} = x y^2 z^2[/tex]

[tex]\dfrac{\partial g}{\partial y} = x^2 y z^2[/tex]

[tex]\dfrac{\partial g}{\partial z} = x^2 y^2 z[/tex]

Integrating the first equation with respect to [tex]x[/tex], we get

[tex]g(x,y,z) = \dfrac12 x^2 y^2 z^2 + h(y,z)[/tex]

Differentiating this with respect to [tex]y[/tex] gives

[tex]\dfrac{\partial g}{\partial y} = x^2 y z^2 + \dfrac{\partial h}{\partial y} = x^2 y z^2 \\\\ \implies \dfrac{\partial h}{\partial y} = 0 \implies h(y,z) = i(z)[/tex]

Now differentiating [tex]g[/tex] with respect to [tex]z[/tex] gives

[tex]\dfrac{\partial g}{\partial z} = x^2 y^2 z + \dfrac{di}{dz} = x^2 y^2 z \\\\ \implies \dfrac{di}{dz} = 0 \implies i(z) = C[/tex]

Putting everything together, we find a scalar potential function whose gradient is [tex]f[/tex],

[tex]f(x,y,z) = \nabla \left(\dfrac12 x^2 y^2 z^2 + C\right)[/tex]

It follows that the curl of [tex]f[/tex] is 0 (i.e. the zero vector).