Copernicus's model of the universe differs from Ptolemy's because Copernicus believed the Sun is at the center of the universe and majority of the bodies in the universe revolves around the Sun.
What is the Universe?The universe is defined as the open place that contains the planets, stars, galaxies, and all other forms of matter and energy.
There are different models of the universe including which contains the Copernicus's model and Ptolemy's model.
The Copernicus's model of the universe differs from Ptolemy's because Copernicus believed the Sun is at the center of the universe and majority of the bodies in the universe revolves around the Sun.
While the Ptolemy's model of the universe differs from the Copernicus's model because Ptolemy believed that the Earth is at the center of the universe and everything in the universe revolves around the Earth.
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Why are the magnetic fields of superconducting magnets often stronger than those of conventional magnets?
The superconducting magnets are able to generate powerful magnetic fields because they have no electrical resistance.
To find the answer, we have to know more about the superconducting magnets.
What is superconducting magnet?An example of an electromagnet is a superconducting magnet. They are constructed from coils of superconducting wire and must be used while being chilled to cryogenic temperatures. Because the wire encircling the magnet has no electrical resistance when it is in its superconducting condition, they may produce powerful magnetic fields. Because of this, the magnet can conduct far greater electrical currents than the typical electromagnet.Thus, we can conclude that, the superconducting magnets are able to generate powerful magnetic fields because they have no electrical resistance.
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Why do we use the halfway-mark as a point of comparison rather than at the point which all the disks are floating?
We use the halfway mark as a point of comparison rather than at the point at which all the disks are floating because If the experiment were to be repeated, we would require a set of reference points.
The net rates of photosynthesis can be compared at the point where half the initial number of disks are floating. The time it takes for half of the disks to float reduces as the net rate of photosynthesis rises, showing an inverse relationship between the value and the net rate.
As photosynthesis develops, oxygen is delivered into the leaf's interior, changing the buoyancy and raising the disks. The rate at which the disks increase is an indirect indicator of the net rate of photosynthesis because cellular respiration, which uses oxygen, is occurring concurrently.
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A 0. 50 l sample of a gas has a mass of 11. 3 g at stp. what is the mass of 1. 00 mol of this gas? in other words, what is the molar mass (molecular weight)?
the molar mass of the given sample is 44.24kg.
To find the answer, we have to know about the concept of mole.
How to find the molar mass of the sample?Mole is the amount of substance that containing Avogadro number of particles.We can write the expression for mole as,[tex]mole,n=\frac{m}{M}[/tex]
where, m is the given mass and M is the molar mass.
Given that, the 0.5 mol of sample has a mass of 11.3g. Thus the molar mass will be,[tex]n=\frac{m}{M} \\M=\frac{n}{m}=\frac{0.5}{11.3*10^{-3}} =44.24kg[/tex]
The mass of 1 mole of given sample will be,[tex]m=n*M=1*44.24kg=44.24kg[/tex]
Thus, we can conclude that, the molar mass of the given sample is 44.24kg.
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If you illuminate red paint with pure blue light, what color will that paint appear?
The red paint will appear no colour when it is illuminated with pure blue light.
Why does a red colour appear as red?When visible light of all wavelengths incident on a red coloured object, it absorbs all the wavelengths accept red colour.So it is reflected from its surface and makes the object red.What does happen when red coloured object is illuminated by pure blue light?As the pure blue light has no red coloured wavelength, so the object cannot reflect the red light wavelength. So we will get no reflection from the object.Thus, we can conclude that the red coloured object appears colourless as it is illustrated by pure blue light.
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A 5,000 kg train is traveling at a velocity of 100 m/s and hits another train. The two trains stick together, and the new velocity is 50 m/s. What is the mass of the second train?
Answer:
We assume the second train was standing still and that momentum is conserved.
Then the product of mass and velocity before the collision is
(5000 kg)·(100 m/s) = 500,000 kg·m/s.
After the collision, where M is the mass of the second train, the momentum is
((5000+M) kg)·(50 m/s) = 500,000 kg·m/s
Dividing by 50 m/s and subtracting 5000 kg, we have
(5000 +M) kg = 10,000 kg
M kg = 5000 kg
The mass of the second train is 5000 kg
Why do the lighter isotopes disappear first from the atmosphere? Where do those isotopes go?
Lighter molecules move fast and escape from the upper atmosphere relatively quickly.
To find the answer, we have to know more about the lighter isotopes.
What are lighter isotopes?Lighter molecules are mobile and soon leave the higher atmosphere.A particular element's stable isotopes have slightly different atomic masses and quantum mechanical energies.The lighter isotope of an element's chemical bonds are more easily broken than the heavier isotope's. As a result, the light isotope typically benefits from chemical reactions.Thus, we can conclude that, lighter molecules move fast and escape from the upper atmosphere relatively quickly.
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Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7?
The star with apparent magnitude 2 is more brighter than 7.
To find the answer, we have to know about apparent magnitude.
What is apparent magnitude?100 times as luminous as a star with an apparent brightness of 7 is a star with a magnitude of 2. The apparent magnitude of bigger stars is always smaller. The brightest star in the night sky is Sirius. The brightness of a star or other celestial object perceived from Earth is measured in apparent magnitude (m). The apparent magnitude of an object is determined by its inherent luminosity, its distance from Earth, and any light extinction brought on by interstellar dust in the path of the observer's line of sight.Thus, we can conclude that, the star with apparent magnitude 2 is more brighter than 7.
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Explain how forces of attraction and repulsion exist within an atom. describe how an electric charge is developed by friction or by contact. contrast electron movement within conductors and insulators. list the ways in which lightning can be produced.
There are three kinds of forces within the atom:
i) Electromagnetic force of attraction between the electrons and protons
ii) Electromagnetic force of repulsion between the protons or weak nuclear force
iii) Strong nuclear force between the electrons and protons
What is nuclear force?The electromagnetic force of attraction:
Electrons circle in the orbits above the nucleus. There exists an electromagnetic force of pull between the electrons and protons. That’s why electrons do not depart the atom.Weak nuclear force:
It is an electromagnetic significance of revulsion between the protons in the nucleus of the atoms.Strong nuclear force:
This force is strongest from all the fundamental details and exists between the protons and neutrons in the nucleus of an atom. This pressure overcomes the weak nuclear force and does not allow protons to stray out.To learn more about nuclear force, refer to:
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Answer:
1.)Electrons surrounding a nucleus are attracted to the protons within it because electrons and protons have opposite charges. Electrons closest to the nucleus are attracted with such a force that they can’t escape from the atom. These electrons tend to shield the protons from electrons that are farther away because electrons have the same charge and repel each other. Electrons that are farther away have less attraction to the protons within the nucleus and are more likely to be detached from the atom.
2.)Electrons can be transferred from atoms of one body to atoms of another body through friction. This can occur when one body is rubbed against another or when a liquid flows across a solid. In either case, one body may be given a positive charge while the other body is given a negative charge of the same magnitude. Both charges are developed at the same time. Electrons can also be transferred from one body to another when a charged body comes into contact with an uncharged body. The electrons move in the direction that will equalize the charges; thus, the uncharged body will be given the same charge as the charged body.
3.)Free electrons move from points of negative charge to points of positive charge. When these electrons move freely from one point to another with little resistance, the material they’re traveling through is said to be a conductor. Conductors have a large number of free electrons. Insulators, on the other hand, have very few free electrons and offer great resistance to the movement of these electrons. Electric charges produced on one end of a body composed of insulating materials will most likely not spread throughout the body. In a conductor, this charge would spread throughout the entire body. Metals are generally conductors; oils, rubber, air, porcelain, and plastics are good insulators.
4.)Lightning is produced by the rapid transfer of free electrons when one of the following conditions exist:
One part of a cloud is positively charged and a neighboring part of the same cloud is negatively charged.
A positively charged cloud comes near a negatively charged cloud.
A cloud with either a positive charge or a negative charge comes near the earth.
Explanation:
PENN FOSTER
A charge of 2 c is at the origin. when charge q is placed at 2 m along the positive x axis, the electric field at 2 m along the negative x axis becomes zero. what is the value of q?
The value of Q will be -8 C.
In the presence of an electric or magnetic field, matter experiences a force due to its electric charge.
A moving electric charge generates a magnetic field, and an electric charge has an accompanying electric field.
The information provided in the issue is;
The separation between and is 2m.
The separation between and is 2m.
An origin charge equals +2 C
The electric fields are identical in magnitude but are facing in different directions. As a result, the following relationship can be used
Q/16=1/2
The value of Q will be -8 C.
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Th value of q is= -8C
How can we calculate the value of the q?Here, To calculate the value of q we use the formula,
The E-field due to a point charge = [tex]\frac{k\times Q}{D^{2} }[/tex]
Here we are given,
D= the distance along the axes.
k= The coulomb's constant.
We have to find, the charge along the axes = Q
Now, we have to substitute the known values in that equation for the cases,
For the E-field at x=-2 to equal 0, the E-fields from both charges must be equal in magnitude and opposite in direction.
For the first case, E from +2C charge = [tex]\frac{k\times Q}{D^{2} }[/tex] = [tex]\frac{k\times (+2C)}{2^{2} }[/tex]=[tex]\frac{k\times (+2C)}{4 }[/tex].
For the second case, E from Q charge= [tex]\frac{-k\times Q}{D^{2} }[/tex]=[tex]\frac{-k\times Q}{(2+2)^{2} }[/tex]=[tex]\frac{-k\times Q}{16 }[/tex].
Now, Comparing the two cases we can find that,
[tex]\frac{k\times (+2C)}{4 }=\frac{-k\times (Q)}{16}[/tex]
Or,[tex]\frac{+2C}{4}= \frac{-Q}{16}[/tex] (Eliminate k from both sides of the equation.)
Or,[tex]Q=-8C[/tex]
So, from the above calculation we can conclude that,
The value of q is -8C.
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An object is dropped from the top of a building and is observed to take 7. 2s to hit the ground. How tall is the building?.
the height of the building is H=36 m.
What is The Law of Gravity?According to Newton's law of gravity, every particle of matter in the universe is attracted to every other particle with a force that varies directly as the product of their masses and inversely as their distance from one another.
Properties of Gravity -
It is a universal attractive force. It is directly proportional to the product of the masses of the two bodies. It obey inverse square law. It is the weakest force known in nature.Examples of Gravity -
The force that holds the gases in the sun.The force that causes a ball you throw in the air to come down again.The force that causes a car to coast downhill even when you aren't stepping on the gas.v₀=0 m/s
H₀=0 m
g=10 m/s²
t=7,2 s
H - ?
[tex]H= H_{0} + v_{0}t+\frac{gt^{2} }{2} \\[/tex]
H = 0 +0 × 7.2 + 10(7.2)²/2
H = 36m
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Glycerin at a temperature of 30 degrees celcius flows at a rate of 8×10−6m3/sthrougha horizontal tube with a 30mmdiameter. what is the pressure drop in pascals per100m?
The pressure drop in pascal is 3.824*10^4 Pascals.
To find the answer, we need to know about the Poiseuille's formula.
How to find the pressure drop in pascal?We have the Poiseuille's formula,[tex]Q=\frac{\pi r^4P}{8\beta l}[/tex]
where, Q is the rate of flow, P is the pressure drop, r is the radius of the pipe, is the coefficient of viscosity (0.95Pas-s for Glycerin) and l being the length of the tube.By substituting values and rearranging we will get the pressure drop as,[tex]P=3.284Pascals[/tex]
Thus, we can conclude that, the pressure drop in pascal is 3.824*10^4.
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In a regression analysis, if sse = 200 and ssr = 300, then the coefficient of determination is:_________
0.600
In a regression analysis, if sse = 200 and ssr = 300, then the coefficient of determination is: 0.600
1. You have that the data set having SSR=300 and SSE=200
2. Therefore you have the coefficient of determination is:
r²=SSR/SSTO
SSTO=SSR+SSE
3. Then, when you substitute the values, you obtain:
SSTO=200+300
SSTO=500
r²=300/500
4. So, you have that the result is:
r²=0.6
As a result, as you can see, the solution to the previous exercise is that the coefficient of determination is 0.6
What exactly is the connection between SST, SSR, and SSE?The difference between SST and SSR is the amount of Y's variability that is still unaccounted for after using the regression model, also known as the sum of squared errors (SSE). Sum of squares of residual can be used to directly calculate SSE.To learn more about regression analysis visit:
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I have provided a picture of the question
Answer:
Explanation:
Formula
Electric Force formula
F = k * q1 * q2 / r^2
Gravitation Force Formula
F = G * m1 * m2 / r^2
Givens
k = 8.99 * 10^9 N m^2/C^2
N = newtons (units of force.m = metersc = coulombs (units of charge.G = 6.67 * 10^-11 N m^2 /kg^2
c_e = c_p = 1.6 * 19 Charge electron / Charge Protonm_e = 9.11 * 10^-31 Mass Electronm_p = 1.67 * 10^27 Mass ProtonSolutions
Fe = 8.99 * 10^9 * 1.6 * 10^-19 ^2/ 8.4 * 10^-11
The force = the electric force constant * the charge of the proton*charge electron/ distance apart in meters. It looks small but actually it is quite large in comparison to the Gravitational Force
Fe = 3.2 * 10^-8 (Answer First Box)
Fg = 6.67 * 10^- 11 * 9.11*10^-31 * 1.67*10^-27 / 8.4 * 10^-11
The gravitational Force is very small. Just look at the powers which come to 10^-68 - -22 = - 46 which is about 6 times smaller than the electric force.
Fg = 1.44 * 10^-47 (Answer Second Box)
How far apart are two conducting plates that have an electric field strength of 4. 4 kv/m between them, if their potential difference is 15 kv?
Conducting plates will be 3.75 m apart if an electric field strength of 4. 4 kV/m between them, if their potential difference is 15 kV
The potential difference, also referred to as voltage difference between two given points is the work in joules required to move one coulomb of charge from one point to the other. The SI unit of voltage is the volt. Volt Formula.
In a simple parallel-plate capacitor, a voltage applied between two conductive plates creates a uniform electric field between those plates. The electric field strength in a capacitor is directly proportional to the voltage applied and inversely proportional to the distance between the plates.
E = V/d
E = Electric field strength
d = distance between the plates
V = potential difference
Electric field strength = 4 kV/m
Potential difference = 15 kV
d = V / E = 15 kV / 4 kV/m
= 3.75 m
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The strip of the sky through which the sun, the moon, and the bright planets appear to move in the course of a year is called:_______.
Answer:
Milky way galaxy
Explanation:
This is where the sun is the main star whereby the other planets and stars revolve around it in a cycle
Ice cubes float in a glass of iced tea. why would cooling be less if the cubes were instead on the bottom of teh drink?
Ice cubes float in a glass of iced tea because due to a lack of convection, ice cubes will cool more slowly if they are on the bottom. Ice is denser than water at 4° C.
Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids. Conduction is used to move heat from the object to the fluid initially, but the fluid motion is responsible for the bulk of the heat transfer.
Natural convection is caused by the fact that most fluids have a tendency to expand when heated, which causes them to become less dense and rise due to the increased buoyancy. Heat is transferred between two bodies by currents of moving gas or fluid, which is known as convection. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.
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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 pressure will 14. 0 g of co exert in a 3. 5 l container at 75°c?
a) 4. 1 atm
b) 5. 0 atm
c) 6. 4 atm
d) 1. 1 atm
The pressure will 14. 0 g of co exert in a 3. 5 l container at 75°c is 4.1atm.
Therefore, option A is correct option.
Given,
Mass m = 14g
Volume= 3.5L
Temperature T= 75+273 = 348 K
Molar mass of CO = 28g/mol
Universal gas constant R= 0.082057L
Number of moles in 14 g of CO is
n= mass/ molar mass
= 14/28
= 0.5 mol
As we know that
PV= nRT
P × 3.5 = 0.5 × 0.082057 × 348
P × 3.5 = 14.277
P = 14.277/3.5
P = 4.0794 atm
P = 4.1 atm.
Thus we concluded that the pressure will 14. 0 g of co exert in a 3. 5 l container at 75°c is 4.1atm.
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Light enters a glass plate at an angle of incidence of 25°. If the index of refraction of a glass is 1.6, the angle of refraction is
a. 15°
b. 16°
c. 40°
d. 43°
The angle of refraction is a. 15°
What is the Snell's law?Snell's law is described as “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given team of media”.
By Snell's law:
η = sin i / sin r. i = 25, η = 1.6
1.6 = sin25° / sin r
sin r = sin25° / 1.6
= 0.4226/1.6= 0.2641
calculating
r = sin⁻¹( 0.2641 )
sin−1(0.264) is ≈ 15.3075
the angle of refraction is a. 15°
What is Snell's first law?
So the angle associated with the incidence and refraction can have a relation to the refractive index of the two mediums. Snell's First Law: It states that the incident ray, the refracted ray and the standard lie on the same plane.
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A galvanic cell is formed when two metals are immersed in solu- tions differing in concentration 1 when two different metals are immersed ? when two different metals are exposed 1 j when two metals are brought close in one electrolyte to air together and electrically insulated from one another.
A galvanic cell is formed when two metals are immersed in solu- tions differing in concentration 1 when two different metals are immersed.
What is galvanic cell?The galvanic cell utilizes the ability to split the flow of electrons in the process of oxidization and reduction, compelling a half-reaction and connecting each with a wire so that a way can be formed for the flow of electrons via such wire.A galvanic cell is an electrochemical cell that transforms the chemical energy of a spontaneous redox response into electrical energy. It has an electrical possibility equal to 1.1 V. In galvanic cells, oxidation occurs at the anode and it is a negative plate. Lessening occurs at the cathode and it is a positive plate. A galvanic cell is an electrochemical cell that converts the free liveliness of a chemical method into electrical energy. A photogalvanic cell generates species photochemically which react resulting in an electrical current via an external circuit.To learn more about galvanic cell, refer to:
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The energy a molecule contains due to its constant random motion is known as ____________.
A. potential energy
B. thermal energy
C. kinetic energy
D. internal energy
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?.
The experiment's time period is unaffected by the change in amplitude in either experiment.
What are the variables that affect time in SHM?The time frame is provided by:
[tex]$T=2 \pi \sqrt{\frac{m}{k}}$[/tex]
where,
T = Time period.
M = mass.
k = spring constant.
We can see from the formula above that the only factors affecting the time period in a Simple Harmonic Motion (SHM) are the object's mass and spring constant. Any changes in the object's mass or the spring constant will cause the time period to adapt.
Describe the Spring Constant.The attribute is known as a spring's "spring constant" describes the relationship between the force acting on a spring and the displacement it causes. In other terms, it describes the stiffness and size of a spring's range of motion.
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19. when the wave speed increases, will the wavelength need to increase, decrease or stay the same to get the same standing wave pattern (such as the one with 3 antinodes)?
When the wave speed increases the wave stay the same to get the same standing wave pattern
Standing wave are the combination of two waves moving in opposite directions . Amplitude of both the waves is same and frequency is also same . The phenomenon is the result of interference
Wavelength and frequency are inversely related to each other .
frequency = c / wavelength
so if one get change then the other changes. As one get decrease other will increase and vise versa. . The speed of the wave depends on the medium. Change in the frequency of the wave changes its form to go into the next harmonic so the wavelength changes .Also in order to maintain the wave pattern the wavelength remain same
Hence , speed of wave will not affect the wavelength of wave.
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Three origin, the identical second point to the charges right of atx 2.0 hc 50 cm, are and placed the on thrd the 1s at x-axis. the 100 the cm first mark. charge 15 what at are the the magnitude le and direction of the electrostatic torce which acts on the charge at the or ongin?
The magnitude and direction of the electrostatic torce is - 0.00712 x 10^9N towards left direction
Given:
q1 = +2 uC
q2 = -2 uC
q3 = +4 uC
To Find:
magnitude le and direction of the electrostatic torce
Solution: Electric force is a vector quantity. The electric force is proportional to the product of the magnitude of the charges. It is inversely proportional to the square of the distance between the charges. The electric force is calculated by,
F = kqQ/r^2
Force between q1 and q2
F1 = +2 x -2 x k/50 x 50 = - 0.0016k
Force between q1 and q3
F2 = +2 x +4 x k/100 x 100 = + 0.0008k
Net force on charge at origin is F1 + F2
F(net) = F1 + F2 = - 0.0016k + 0.0008k
F(net) = - 0.0008 x 8.9 x 10^9 = - 0.00712 x 10^9N
So, force on charge at origin is - 0.00712 x 10^9N and towards left direction
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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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In a particular chemical reaction, the energy of the reactants is 30 kJ and the energy of the products is 5 kJ. The maximum energy of the system is 40 kJ.
Sketch a potential energy diagram for this reaction. Make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.
What is the activation energy for this reaction?
What is the enthalpy change for this reaction?
Is this reaction endothermic or exothermic? Explain your answer in two ways: first, using the energy values, and second, by referring to the shape of the graph.
The coating on the head of a match is highly flammable. When it burns, it releases a great deal of energy. However, before the match can burn, it must gain a small amount of energy from a spark. That spark is typically produced by striking (rubbing) the match head against a rough surface. Sketch and describe a potential energy diagram that represents the striking and burning of the match. Remember to label the diagram with the energy changes that occur. Your answer must include the potential energy diagram and a written description. (Note: you do not have to use actual energy values.)
An energy of 25kJ is given out hence the reaction is exothermic.
What is a reaction?Chemical reaction is said to occur when reactants combine leading to the formation of products. In a plot of the energy against the reaction profile, the topmost point of the graph is called the activation energy.
We know that a reaction is exothermic when reactants posses more energy than the products. Hence the enthalpy change for this reaction is;
ΔH = 5kJ - 30kJ = -25kJ thus the reaction is an exothermic reaction.
Now, the activation energy for the lighting of the match stick is high that is why a spark is required before the reaction gets underway. Heat is evolved in the process hence the reaction is exothermic. The energy of the reactants is greater than the energy of the products.
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What is the frequency in hertz of a signal that repeats 80,000 times within one minute? What is its period?
1333.3 is the frequency in the hertz of a signal that repeats 80,000 times within one minute. 0.00075 is its period.
The frequency of a repeated event is its number of instances per unit of time. In some cases, it is also referred to as temporal frequency or ordinary frequency to underline differences with spatial and angular frequencies, respectively.
The length of time it takes for a particle in a medium to complete one full vibrational cycle is the period of a wave. Being a time, a period is measured in time units like seconds, hours, days, or years. The Earth's orbit around the Sun has a duration of around 365 days, and one cycle of the Earth lasts 365 days.
frequency = cycle /second
frequency = 80000 / 60
frequency = 1333.3 hertz
Period = 1 / frequency
Period = 1 / 1,333.3
Period = 0.00075
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When current flow tries to decrease in an inductor, the magnetic field ________ and the voltage polarity across the inductor ________.
When current flow tries to decrease in an inductor, the magnetic field collapses and the voltage polarity across the inductor reverses
The associated magnetic flux also decreases, it then induces an e m f across the inductor, the sense of which is to assist the decreasing current.
Faraday's law of induction (to distinguish it from his laws of electrolysis), states that the magnitude of the emf induced in a circuit is proportional to the rate of change with time t of the magnetic flux Φ that cuts across the circuit:
emf = −dΦ/dt
Lenz's law, in electromagnetism, statement that an induced electric current flows in a direction such that the current opposes the change that induced it.
When the current flowing through the coil changes, the time-varying magnetic field induces an electromotive force (e.m.f) in the conductor, described by Faraday's law of induction.
According to Lenz's law, the induced voltage has a polarity (direction) which opposes the change in current that created it. As a result, inductors oppose any changes in current through them. Hence , polarity across the inductor got reversed
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I WILL MARK U BRAINLIEST IF U CAN ANSWER THIS QUESTION!!
Answer:
The answer is (d) is totally reflected
Explanation:
Using the total internal reflection concept.
This concept state that:
"If the angle of incidence is greater than the critical angle then the light will not refract but it will reflect back totally"
Using the above statement, as incident angle is 42 degree and critical angle is 41 degree it means incident angle is greater than the critical angle. Therefore, light will not refract but it will totally reflected.
What is the net force on a rock that has a force of 4.9N down and 2.8N up applied to it
7.7N up
-7.7N down
-2.1N down
2.1N down
The net force on a rock that has a force of 4.9N down and 2.8N up applied to it is 2.1N down.
Define force.
A force is an effect that can alter an object's motion according to physics. An mass-laden object can change its velocity, or accelerate, as a function of a force. An obvious method of describing force is as a push or a pull. A force is a vector quantity because it possesses both magnitude and direction.
Thrust, which increases an object's velocity; drag, which decreases an object's velocity; and torque, which causes changes in an object's rotational speed, are all concepts connected to force. Each part of an extended body often exerts stresses on the sections that are nearby.
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