The density of sample is 5 g/cm3
Given:
volume of sample = 20 cm3
mass of sample = 100 grams
To Find:
density of sample
Solution: Density is the measure of how much “stuff” is in a given amount of space. For example, a block of the heavier element lead (Pb) will be denser than the softer, lighter element gold (Au). A block of Styrofoam is less dense than a brick. It is defined as mass per unit volume
density = mass/volume
d = 100/20
d = 5 g/cm3
So, density of sample is 5 g/cm3
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What is a stele?
a) carved stone slab used for voting
b) carved stone slab symbolizing the creation of humankind
c) carved stone slab used to mark graves or historical events
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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Each giant planet has a core made of ________ that is 5 to 10 times the mass of earth.
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.
What are rocky materials?The term rocky material refers to materials predominantly made up of the elements carbon, nitrogen, and oxygen in combination with hydrogen. A core of "ice" and "rock" equal to around 10 Earth masses exists within each large planet. Major internal heat sources on Jupiter, Saturn, and Neptune allow them to absorb as much (or perhaps more) energy as they do from solar radiation. There is no discernible interior heat in Uranus.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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Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. in order to cause electrons to be ejected from the surface of this metal you should:_________
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.
What is Photoelectric Effect ?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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If 30 j of magnetic potential energy is stored in a 6. 0-h inductor, what is the current in the inductor?
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:-
As a result of the magnetic forces that magnets exert on one another, magnetic potential energy is the energy that is stored in a system of magnets.Magnetic potential energy stored in an inductor, U = 1/2 (L[tex]I^{2}[/tex])L is the inductance of the inductor.I is the current flowing through the inductor.Learn more about Current here: https://brainly.com/question/17403680
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What role does inequality play in a society’s tendency toward rigidity – that is, a tendency to not adapt to mounting problems and pressures?
Social inequality, as defined by sociologists, is the unequal distribution of desirable resources, rewards, and positions in a society.
What is social inequality?
Key to the concept is the notion of social differentiation. People are classified and differentiated based on social features such as differences, identities, and roles, which has an impact on social inequality. Social difference on its own need not imply the segregation of people into classes based on privilege, rank, and power. Social differentiation, however, forms the foundation of social inequality when a social category—such as class, occupation, gender, or race—puts people in a position where they may demand a larger share of resources or services.Learn more about the social inequality with the help of the given link:
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A car moving 18.2 m/s starts to coast up a frictionless 10.0 degree hill. how far does it roll before coming to a stop
The distance covered by the car before it stops is 98.58 m.
Calculation: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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14. The cutaway diagram below shows the paths
of earthquake waves generated at point X.
P- and
S-waves
reach
seismograph
No waves
Crust
Mantle
Core
P-waves only
-
Focus
Only P-waves reach the side of Earth that
is opposite the focus because P-waves
(1) are stronger than S-waves
(2) travel faster than S-waves
(3) bend more than S-waves
(4) can travel through liquids
and S-waves cannot
14
S-Wave Travel Time Copyright © 2017
Topical Review Book Compars
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.
What are P waves?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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A mass m is attached to an ideal massless spring with spring constant k. In experiment 1 the mass oscillates with amplitude a, and period t. A student grabs the mass and brings it to rest before starting experiment 2. In experiment 2, the mass is set to oscillate with a larger amplitude of 3a. What is the period of the oscillation in experiment 2?.
Time period remains the same in both the experiment as change in amplitude does not affect time period.
What are the factors on which time period depends in SHM?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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A stone that is thrown vertically upwards was having a velocity of 15m/s after reaches 2/3 of its maximum height. What is the maximum height that can be reached by the stone?
A. 9.8m
B. 11.5m
C. 22.9m
D. 34.4m
The correct answer is option B. The maximum height that can be reached by the stone is determined as 11.5 m.
Maximum height attained by the stoneThe maximum height attained by the stone when it is a 2/3 of its total height is calculated as follows;
v² = u² - 2gh
where;
v is final velocity at maximum height, v = 0u is initial velocityg is acceleration due to gravity0 = 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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Wolfgang pauli hypothesized an exclusion principle. This principle says two electrons in an atom cannot have the same what?.
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.
What is Pauli's exclusion principle ?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.
It is known as the exclusion principle because, in accordance with it, all other electrons in an atom are excluded from having the same set of specific values for the four quantum numbers as one electron in the atom.Learn more about Pauli's exclusion principle here:
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A girl, standing on a bridge, throws a stone vertically downward with an initial velocity of 12.0 m/s, into the river below. if the stone hits the water 2.50 seconds later, what is the height of the bridge above the water?
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
An astronaut travels to a position in space that is a height of 2R above the surface of the earth, where R is earths radius.At this height, the force of earths gravity is ____ of its force at the surface.
A.1/8
B.1/9
C.1/4
D.1/3
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
A fixed container containing an ideal gas is heated. The pressure of the gas increases because:_________
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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A 2. 0-m wire carrying a current of 0. 60 a is oriented parallel to a uniform magnetic field of 0. 50 t. what is the magnitude of the force it experiences?
The magnitude of the force is(F)= 0 N.
How can we calculate the value of the magnitude of the force?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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What potential difference is required in an electron microscope to give an electron wavelength of 4. 5 nm?
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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What would happen if the government taxed the producers of thsi product because it has negative externalities?
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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What is the name given to the portion of the electrocardiogram between two waves?.
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.
What is ECG ?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.
A test that captures the electrical activity of the heart is called an electrocardiogram (ECG). The ECG shows what is occurring in various heart regions and aids in identifying any issues with heart rate or rhythm.Learn more about ECG here:
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From different frames of reference, time intervals and lengths both appear different. what is one measurement that will appear the same to all observers?
The speed of a beam of light will appear the same to all observers.
Speed of light: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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When a piece of paper is held with one face perpendicular to a uniform electric field the flux through it is 25 n·m2/c. when the paper is turned 25° with respect to the field the flux through it is:_____.
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.
What do you mean by Electric flux? What is the formula to calculate it?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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A basketball is thrown with an initial upward velocity of feet per second from a height of feet above the ground. the equation models the height in feet t seconds after the basketball is thrown. after the ball passes its maximum height, it comes down and then goes into the hoop at a height of feet above the ground. about how long after it was thrown does it go into the hoop?
The answer is t=1.29 seconds.
What is Velocity?The rapidity of movement or operation; swiftness; speed: a high wind velocity. Mechanics. the time rate of evolution of position of a body in a specified demand. the rate of speed with which something happens; rapidity of movement or reaction.Velocity is the prime hand of the position as well as the rapidity of the object. It can be characterized as the distance covered by an object in a unit of time. Velocity can be defined as the displacement of an object in a unit of time.Velocity (v) is a vector amount that measures displacement (or change in position, Δs) over the change in time (Δt), described by the equation v = Δs/Δt. Speed (or rate, r) is a scalar amount that measures the distance traveled (d) over the transformation in time (Δt), represented by the equation r = d/Δt.To learn more about Velocity, refer to:
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What do the mural paintings at dura-europos suggest was a component of the decoration of many late antique synagogues?
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.
What is Mural painting?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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The net reaction of the calvin cycle is the conversion of co2 into the three-carbon sugar g3p. Along the way, reactions rearrange carbon atoms among intermediate compounds and use the atp and nadph produced by the light reactions. In this exercise, you will track carbon atoms through the calvin cycle as required for the net production of one molecule of g3p.
The conversion of CO2 into the three-carbon sugar G3p is the Calvin cycle's net reaction.
What is Calvin Cycle?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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What was discovered in atomic spectra by physics pioneers balmer, rydberg, and ritz?
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 :
Emission spectraAbsorption spectraContinuous spectra.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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What is the maximum size of a three-phase, 240-volt motor that can be controlled using a size 2 nema contactor?
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.
What is a NEMA contactor?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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how to solve this? help
The resistance value of the sliding rheostat is 15 ohms.
What is resistance?
Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms.
Total resistance of the circuitThe 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
Resistance value of the sliding rheostatThe 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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The compass is a small bar magnet that’s free to spin. Based on what you observed, is the coil of wire with current passing through it a magnet?
The compass is a small bar magnet that’s free to spin. Based on what you observed, is the coil of wire with current passing through it a magnet?
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.
The galaxy ngc 4414 is moving away from us at 7.16x10^5 m/s. by how much will the frequency of the 6.91x10^14 hz hydrogen line be shifted in the galaxy's spectrum
shifting of the frequency will take place by 1.674 × 10¹² Hz.
What is Frequency?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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Discuss the application of faraday's law to the existence (not the sign) of the induced voltage before you energize the primary coil
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 photon of blue light has a ____ frequency and a _____ wavelength than a photon of red light.
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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What is the relationship between Newton first law of motion and inertia
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.
