Type the correct answer in the box. use numerals instead of words. anne has a sample of a substance. its volume is 20 cm3, and its mass is 100 grams. what is the sample’s density? the sample’s density is g/cm3.

Current in the inductor, I = 100A

Given,

Magnetic potential energy stored, U= 30 joule

Inductance, L = 6.0 H

Therefore, current in the inductor, [tex]I^{2}[/tex]= (2×30×10^3) ÷ 6

                                                           = 2×5×10^3

                                                           = 10×10^3

                                                   [tex]I^{2}[/tex]       = 10000

                                                   I        = √10000

                                                  I        = 100A

Concept:-

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Mathematical order in atomic spectra was discovered by physics pioneers Balmer, Rydberg, and Ritz.

Atomic spectra are defined as the spectrum of the electromagnetic radiation emitted or absorbed by an electron during transitions between different energy levels within an atom.

When an electron gets excited from one energy level to another, it either emits or absorbs light of a specific wavelength. The collection of all these specific wavelengths of the atom in a given set of conditions like pressure, temperature, etc. is the atomic spectra of atoms. There are three types of atomic spectra and they are :

Using the Rydberg formula, it becomes easy to calculate the spectral lines. Following is the formula:

[tex]\begin{array}{l}\frac{1}{\lambda }=RZ^{2}(\frac{1}{{n}’^{2}}-\frac{1}{n^{2}})\end{array}[/tex]

Where,

R is the Rydberg constant (1.09737*107 m-1)

Z is the atomic number

n is the upper energy level

n’ is the lower energy level

λ is the wavelength of light

Spectral series of single-electron atoms like hydrogen have Z = 1.

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The speed of a beam of light will appear the same to all observers.

The exact distance that light travels in a vacuum in a second is 299,792,458 meters (983,571,056 feet). This is roughly 186,282 miles per second, or "c," the symbol for light speed in mathematics.

According to Einstein's theory of special relativity, an object (such as a single photon of light) cannot appear to move faster than the speed of light. This physical rule is not broken by Nemiroff's experiment since the laser pointer emits a stream of photons rather than a single photon.

Nothing can move faster than light in a vacuum, according to one of physics' most revered rules. However, in a recent experiment, this speed restriction was broken when a laser pulse traveled at more than 300 times the speed of light.

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A photon of blue light has a higher frequency and a lower wavelength than a photon of red light.

The wavelength of light is the distance between corresponding points in two adjacent light cycles, and the frequency of light is the number of cycles of light that pass a given point in one second.

Wavelength is typically represented by λ, the lowercase Greek letter lambda, while frequency is represented by ν, the lowercase Greek letter nu

Red light has a wavelength of ~700 nm, and a frequency of ~4.3*[tex]10^{14}[/tex] Hz. Visible light makes up just a small part of the full electromagnetic spectrum.

Wavelength of blue light: 450nm and  frequency of blue light 6.66 * [tex]10^{14}[/tex] Hz

Blue light has higher frequency, shorter wavelength and more energy.

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We will decrease the wavelength of light in order to cause electrons to be ejected from the surface of this metal.

We have a Light of a given wavelength that is used to illuminate the surface of a metal, however, no photoelectrons are emitted.

We have to find out what can we do in order to cause electrons to be ejected from the surface of this metal.

The emission of electrons from the surface of the metal when the light of specific frequency (greater than the threshold frequency) falls over it is called photoelectric effect.

Light consists of photons. The energy associated with the photons is used to emit out the electrons from the surface of metal. We know that - Energy can neither be created nor be destroyed and it can only be transferred from one body to another. Hence, the energy of these moving photons is used to emit electrons from the metal surface. The energy associated with the photon is given by -

E = hμ

Where - μ is the frequency of light an h is Planck's constant.

Now, we can see that the energy of the photon is directly proportional to the frequency of light. The minimum frequency required to eject the electron from the metal surface is called Threshold frequency. Thus, we can emit the electron from the metal surface by using the light of frequency greater than threshold frequency.

Hence, we will increase the frequency of light in order to cause electrons to be ejected from the surface of this metal

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The application of faraday's law to the existence (not the sign) of the induced voltage before you energize the primary coil

The magnitude of the emf generated in a circuit is proportional to the rate of change with time t of the magnetic flux that cuts across the circuit emf, according to this relationship, also known as Faraday's law of induction (to distinguish it from his laws of electrolysis).

According to Faraday's law of induction, when a magnetic field changes, a voltage results. This difference in electric potential can induce electric currents to flow.

The first faraday's law states that the amount of chemical change caused by a current at an electrode-electrolyte interface is proportional to the amount of electricity used, while the second law states that different substances can undergo different amounts of chemical change when the same amount of electricity is applied to them.

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A fixed container containing an ideal gas is heated. The pressure of the gas increases because the molecules move faster.

You can speed up the motion of the molecules in a gas by heating it. The pressure will rise and there will be greater impacts on the container's walls.

The container walls are pressed against by the combined force of the collisions. The energy you provide when you heat the gas makes the gas's particles more kinetically energetic and put more pressure on the container.

As the temperature rises, the pressure must as well since pressure is the force the particles per unit of area exert on the container.

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Answer:

1/8

Explanation:

2R is the same as 1D, so you are a full diameter above yhe earth. The diameter of the earth is 12,742km, space starts at 100km so it probably isn't a third or a quarter. it is most likely an 1/8 or 1/9. if I had to guess it would be 1/8

Only P-waves reach the side of Earth that is opposite the focus because P-waves option 4:  can travel through liquids and S-waves cannot.

A P wave is known to be a compressional wave. This is seen as  a kind of a seismic body wave that often moves or shakes the ground a lot in the same direction and also in its opposite direction as the  wave moving direction.

Note that the P waves can be able to move via liquid and solids and gases, but the S waves can only move through solids.

Hence, Only P-waves reach the side of Earth that is opposite the focus because P-waves option 4:  can travel through liquids and S-waves cannot.

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Answer:

the relationship between Newton first law of motion and inertia is there are two types of inertia: 1. Inertia of rest

2. Inertia of motion

Newton first law states that the body at rest stays at rest until it is acted by external or unbalanced force that is inertia of rest or body in motion remain in motion unless it is acted by unbalanced force or external force and this is inertia of motion.

Inertia is the tendency of an object to remain at motion or in rest.

The answer is t=1.29 seconds.

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shifting of the frequency will take place by 1.674 × 10¹² Hz.

Frequency is a unit of measurement for how frequently a recurrent event, like a wave, takes place over a specified period of time. A cycle is one repetition of the repeating pattern. Frequency only exists in moving waves that change their places throughout time. Frequency is one way to define how fast a wave moves.

Δλ/λ₀ = v/c

Relativistic doppler effect,

[tex]v' = v_{0} \frac{ \sqrt{ 1 - v/c}}{ \sqrt{ 1 + v/c}}[/tex]

[tex]\frac{v}{c}= \frac{7.16}{3000}[/tex]

[tex]v'= 6.91 * 10^{14} * \frac{\sqrt{1 -\frac{7.16}{3000} } }{\sqrt{1-\frac{7.16}{3000} } }[/tex]

[tex]v'=6.893 * 10^{14}[/tex]

[tex]|v'-v_{0}|= 1.647 * 10^{12}[/tex]

shifting of the frequency will take place by 1.674 × 10¹² Hz.

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The mural paintings at Dura-europos suggested narrative scenes were part of the component of the decoration of many late antique synagogues in this type of context.

This refers to a type of graphic work which is usually done on walls, ceilings etc. This is usually done by a professional known as a painter and uses different techniques to get the right shades and shape.

This type of painting was used at Dura-europos in which different narrative scenes served as a component for the many late antique synagogues in this aspect and context of artwork present during that period of time.

This therefore makes narrative scenes the most appropriate choice.

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Stele is a c) carved stone slab used to mark graves or historical events

It is a stone or wooden slab, generally taller than it is wide, erected in the ancient world as a monument. The surface of the stele often has text, ornamentation, or both. Stela, also spelled stele , plural stelae, standing stone slab used in the ancient world primarily as a grave marker but also for dedication, commemoration, and demarcation.

Stelae were created for many reasons. Grave stelae were used for funerary or commemorative purposes. Stelae as slabs of stone would also be used as ancient Greek and Roman government notices or as boundary markers to mark borders or property lines. Stelae were occasionally erected as memorials to battles.

Today, forms of stele are still used, most often in war monuments.

hence , stele used for carved stone slab used to mark graves or to commemorate historical events.

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Answer:

60.7 m high

Explanation:

d = v t   +  1/2 a t^2

  = 12 (2.5) + 1/2 (9.81)(2.5^2)  = 60.7  m

Time period remains the same in both the experiment as change in amplitude does not affect time period.

Time period is given by:

[tex]T = 2\pi \sqrt{\frac{m}{k} }[/tex]

where,

T = time period

m = mass

k = spring constant

From the given formula, we find that the time period is only dependent on mass of the object and spring constant in a simple harmonic motion (SHM). If there is any change in mass of the object or the spring constant, the time period will change accordingly.

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15 HP at 240 V is the maximum size of a three-phase, 240-volt motor that can be controlled using a size 2 NEMA contactor

This is further explained below.

Generally, Size 2 NEMA contactors can only handle three-phase, 240-volt motors up to 15 horsepower at 240 volts.

In conclusion, Contactors and motor starters produced by NEMA (National Electrical Manufacturers Association) are graded according to their sizes. These sizes are categorized according to the current and power ratings that they carry.

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The resistance value of the sliding rheostat is 15 ohms.

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms.

The total resistance of the circuit can be calculated from the total current in the circuit and the total voltage in the circuit.

R = V/I

R = 50 /2

R = 25 ohms

The resistance value of the sliding rheostat is calculated as follows;

R(rheostat) = 25 ohms - 10 ohms = 15 ohms

Thus, the resistance value of the sliding rheostat is 15 ohms.

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Social inequality, as defined by sociologists, is the unequal distribution of desirable resources, rewards, and positions in a society.

What is social inequality?

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The distance covered by the car before it stops is 98.58 m.

Force acting on the car will be

ma = -mg sinθ

where,

m = mass of the car

a = acceleration of the car

g = acceleration due to gravity

θ = angle of inclination

Given,

θ = 10°

Put the values in the above equation,

ma = -mg sinθ

a = -g sin 10°

a = -10 (0.173)

a = -1.73 m/s²

We know the initial velocity is 18.2m/s and when the car comes to a stop the final velocity becomes zero.

u = 18.2 m/s

v= 0 m/s

Using one of the kinematics equations,

v² - u² = 2as

0 - (18.2)² = 2 (-1.73) (s)

331.24 = 3.36 (s)

s = 98.58 m

Hence, the distance covered by the car before it stops is 98.58 m.

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When the government intervenes in markets with external costs, it does so in order to protect the interests of bystanders. An externality is either an external cost or external benefit that spills over to bystanders.

Government can play a role in reducing negative externalities by taxing goods when their production generates spillover costs. This taxation effectively increases the cost of producing such goods. The higher cost, then, better reflects the true cost of production because it includes the spillover costs of, say, pollution.

So, such taxation attempts to make the producer pay for the full cost of production. The use of such a tax is called internalizing the externality. When the government intervenes in markets with external costs, it does so in order to: protect the interests of bystanders. An externality is either an external cost or external benefit that spills over to bystanders.

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The flux through the paper when the paper is turned 25° with respect to field will be 22.67 [tex]Nm^{2} /C[/tex].

We have a piece of paper is held with one face perpendicular to a uniform electric field the flux through it is 25 [tex]Nm^{2} /C[/tex].

Now we have to calculate the flux through the paper if it is turned 25° with respect to the field.

Electric flux (E) through a surface is defined as the dot product of Electric field vector and Normal vector to the surface. The formula to calculate the electric flux is -

Φ = [tex]\vec{E}.\vec{A}[/tex] = E x A x cosθ

In the question it is given that when one face perpendicular to a uniform electric field the flux through it is 25 [tex]Nm^{2} /C[/tex]. In this case θ = [tex]0^{o}[/tex].

Therefore -

E x A x cos [tex]0^{o}[/tex] = 25

EA = 25 [tex]Nm^{2} /C[/tex]

When the paper is turned [tex]25^{o}[/tex] with respect to field, then the flux through it can be calculated as follows -

Φ = 25 x cos ([tex]25^{o}[/tex]) = 22.67 [tex]Nm^{2} /C[/tex].

Hence, the flux through the paper will be 22.67 [tex]Nm^{2} /C[/tex].

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The correct answer is option B. The maximum height that can be reached by the stone is determined as 11.5 m.

The maximum height attained by the stone when it is a 2/3 of its total height is calculated as follows;

v² = u² - 2gh

where;

0 =  u² - 2gh

2gh =  u²

h =  u²/2g

h = (15²)/(2 x 9.8)

h = 11.48 m

h = 11.5 m

Thus, the maximum height that can be reached by the stone is determined as 11.5 m

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The core of each giant planet is made up of rocky materials, which is 5 to 10 times the mass of earth.

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

Thus, we can conclude that, the core of each giant planet is made up of rocky materials, which is 5 to 10 times the mass of earth.

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Answer:

yes, it is a magnet.

Explanation:

The electrons that are travelling through the wire go in 1 direction allowing it to create a magnetic field around its area.

Potential difference required in an electron microscope to give an electron wavelength of 4. 5 nm will be 0.063 V.

The difference in potential between two points that represents the work involved or the energy released in the transfer of a unit quantity of electricity from one point to the other is called potential difference.

The wavelength of an electron is calculated for a given energy (accelerating voltage) by using the de Broglie relation between the momentum p and the wavelength λ of an electron

lambda = 4.5 nm = 4.5 * [tex]10^{-9}[/tex] m

h = [tex]6.626 * 10^{-34}[/tex]  J s

e = 1.6 * [tex]10^{-19}[/tex] C

m = 9.1 * [tex]10^{-31}[/tex] kg

Energy = eV

lambda = h / [tex]\sqrt{2mE}[/tex] = h / [tex]\sqrt{2m(eV)}[/tex]

[tex](lambda)^{2}[/tex] = [tex]h^{2}[/tex] / (2m (eV))

V = [tex]h^{2}[/tex] / (2 m e  [tex](lambda)^{2}[/tex] )

V  =  [tex](6.626 * 10^{-34} )^{2}[/tex] /  2 * 9.1 * [tex]10^{-31}[/tex] *  1.6 * [tex]10^{-19}[/tex]  * [tex](4.9 * 10^{-9}) ^{2}[/tex]

V = 0.063 V

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Segment

The space between two waves is known as a segment in an ECG. Beginning at the end of the P wave and ending at the beginning of the QRS complex is the PR segment. Beginning at the end of the QRS wave and ending at the beginning of the T wave is the ST segment.

An electrocardiogram (ECG) is a quick test that can be used to examine the electrical activity and rhythm of your heart. The electrical signals that your heart beats out each time it beats are picked up by sensors that are affixed to your skin.

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No two electrons in an atom or molecule may have the same four electronic quantum numbers, according to the Pauli Exclusion Principle. Only two electrons can fit into an orbital at a time, hence they must have opposing spins.

According to Pauli's exclusion principle, two electrons cannot share the same orbital and must have anti-parallel or opposite spins. Example: Two bonded electrons in a neutral helium atom achieve the opposite spin to occupy the lowest-energy () states.

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The magnitude of the force is(F)= 0 N.

To calculate the force here we use the formula,

[tex]F= I \times L \times B \times sin\theta[/tex]

Here we are given,

I= The current passing through the wire = 0.60A.

L= The length of the wire= 2.0 m.

B= The magnetic field created by the wire= 0.50T.

[tex]\theta[/tex]= The angle that the wire makes after orientation= 0° (because its orientation is parallel).

We have to find the magnitude of the force = F

Now, we substitute the known values in the above equation,

[tex]F= I \times L \times B \times sin\theta[/tex]

Or, [tex]F= 0.60 \times 2.0 \times 0.50 \times sin (0)[/tex]

Or, F=0

Now from the above calculation we can conclude that, the magnitude of force is 0 N.

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The conversion of CO2 into the three-carbon sugar G3p is the Calvin cycle's net reaction.

Calvin cycle uses ATP and NADPH, which are created during the light reaction, to decrease atmospheric carbon dioxide in 3C sugar; Three steps can be distinguished in the Calvin Cycle reaction:

Carboxylation: A reaction that is catalyzed by RUBISCO, where RUBIP is the CO2 acceptor, results in the formation of 6 molecules of PGA (phosphoglycerate).

Here, there are 6 molecules with 18 carbons in PGA and 3 molecules with 3 carbons in CO2.

Reduction: One molecule of the output, glyceraldehyde 3 phosphate, is used to create sugar while the remaining five molecules go through regeneration.

Here, one glyceraldehyde-3-phosphate molecule with three carbon atoms is present.

Regeneration: From glyceraldehyde 3 phosphate, CO2 acceptor (RUBIP) is generated.

Here, 3 molecules of RUBIP and 5 molecules of dihydroxy acetone phosphate each have 15 carbons.

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