Answer:
If the light were incident upon two polarizers at right angles, no light would get thru - thus each polarizer must block 50% of the light.
One polarizer would allow 50% of the light to pass.
Find the magnitude of this
vector:
Answer: = 25. 5 m
Explanation:
2-D vectors can be solved using the Pythagorean theorem: [tex]a^{2} +b^{2} =c^{2}[/tex]The hypotenuse, or longest side is not given and that is what must be solved forDirection can be omitted as the question only asks for magnitudeMagnitude: is the distance or quantity in which an object moves during motionSolve for C using Pythagorean theorem:
1. [tex]\sqrt{a^{2}+b^{2} }=c[/tex]
2. [tex]\sqrt{22.2 m ^{2} +12.6m^{2} } =c[/tex]
3. [tex]25.52646 m= c[/tex]
round to lowest number of significant digits when dividing and multiplyingrounded to 3 significant digits∴ Magnitude of the vector is 25.5 m
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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Find the critical value of t for a two-tailed test with 14 degrees of freedom using = 0. 5
The critical value of t for a two-tailed test with 14 degrees of freedom using = 0. 5 is ±164.5577.
In hypothesis testing, critical values are one of the two approaches which allow you to decide whether to retain or reject the null hypothesis.
The critical value approach consists of checking if the value of the test statistic generated by your sample belongs to the so-called rejection region, or critical region, which is the region where the test statistic is highly improbable to lie. A critical value is a cut-off value (or two cut-off values in case of a two-tailed test) that constitutes the boundary of the rejection region(s). In other words, critical values divide the scale of your test statistic into the rejection region and non-rejection region.
To determine critical values, you need to know the distribution of your test statistic under the assumption that the null hypothesis holds. Critical values are then the points on the distribution which have the same probability as your test statistic, equal to the significance level α. These values are assumed to be at least as extreme at those critical values.
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convert 0.74ev to joules
How would a small bar magnet be oriented when placed at position X?
Based on the document attached, the small bar magnet will be oriented when placed at position X is option d:
What is the magnet position about?The orientation of the magnets is known to be one that do affect its magnetic force. Atoms atoms, such as iron, are known to often gives a stronger magnetic force when compared to other atoms.
These atoms can be seen as tiny magnets, that has the north and south of each pole. If the poles is known to be oriented in all directions, the material will not bring about a net magnetic force.
Therefore, Based on the document attached, the small bar magnet will be oriented when placed at position X is option d because the shapes of the magnetic field lines in regards to the bar magnet are said to be closed.
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A particle with charge 5. 0 μc is placed at the corner of a cube. the total electric flux through all sides of the cube is:_____.
A particle with a charge of 5. 0 μc is placed at the corner of a cube. the total electric flux through all sides of the cube is 7.1 × [tex]10^4 Nm^2/C[/tex].
Electric flux:Electric flux is a measurement of how many electric field lines are present at any given surface. It has a scalar value. Voltmeters are its SI unit. Gaussian Law It is known as a closed surface when the total flux linked inside it is equal to one zero times the total charge contained within it.
The electric flux is positive when electric lines emerge from a surface and negative when the same lines enter a surface.
Flux through any surface is given by;
Φ[tex]= \frac{Q}{E}[/tex]
Where, E = The magnitude of the electric field.
Q = The charge of the particle.
If a corner atom is shared by eight neighboring such cubes, then one- eight part of the corner atom or particle contributes to each cube.
Φ [tex]= \frac{Q}{8E}[/tex] = [tex]\frac{5 * 10^-^6}{8*8.5 * 10^-^1^2}[/tex]
= 7.1 × [tex]10^4 Nm^2/C[/tex]
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If a critical mass of fissionable material in a spherical shape is flattened like a hamburger, it will be?
A subcritical state will result by flattening a critical mass of fissionable material into the shape of a hamburger.
To find the answer, we need to know about the critical mass.
What is critical mass?A material's nuclear characteristics (particularly, its nuclear fission cross-section), density, shape, enrichment, purity, temperature, and environment all affect its critical mass.A mass of fissile material is considered to be in a critical state when a nuclear chain reaction in the mass is self-sustaining and there is no change in power, temperature, or neutron population. At a specific temperature, a mass might be precisely critical. A subcritical state will result by flattening a critical mass of fissionable material into the shape of a hamburger.The cross sections for fission and absorption grow as the relative neutron velocity drops.Thus, we can conclude that, a subcritical state will result by flattening a critical mass of fissionable material into the shape of a hamburger.
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Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is?
The frequency of the re-emitted light is identical to that of the absorbed light.
To find the answer, we need to know more about the frequency of light.
Why the re-emitted light has the same frequency?The wavelength of the light that is momentarily absorbed in glass and then re-emitted is the same, which explains why the re-emitted light has the same frequency as the absorbed light and the frequency of the absorbed light is the same. An electromagnetic wave's energy is inversely related to its frequency. The relationship between the wave's wavelength and frequency depends on the speed of light:[tex]frequency=\frac{c}{wave length}[/tex] , c is the speed of light.
Despite not having mass, light still has energy, and that energy is conserved. As a result, in order for there to be energy conservation, the energy of the light that is received and reemitted must be equal.Thus, we can conclude that, the re-emitted light's frequency matches the absorbed light's frequency.
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An astronomer is studying galaxies of stars that are very far away and thus look extremely faint (using visible light). What kind of telescope should she and her graduate students apply for time on?
If the galaxies that are being studied are very far away, it follows that the telescope with the biggest aperture possible should be used.
What is a telescope?A telescope is a device that is used for the study of the outer space. The telescope can be mounted in an observatory and then used to observe the various galaxies that exist out there in space.
There are various kinds of telescopes that could be used for different kinds of studies that take place in outer space and these telescopes are quite responsible for the breakthroughs that we have so far experienced in the study of the occurrences in outer space.
Thus, if the galaxies that are being studied are very far away, it follows that the telescope with the biggest aperture possible should be used.
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Which would be represented by FN on a force diagram?
O Northern Force
O Newton Force
O Normal Force
O Negative Force
The acronym FN on a force diagram would represent Normal Force. That is option C.
What is a force diagram?A force diagram is the type of diagram that illustrates the different types of forces acting on an object.
The types of forces that can be represented by a force diagram include the following:
Applied Force.Gravitational Force.Normal Force.Frictional Force.Air Resistance Force.Tension Force.Spring Force.The normal force (FN) is the force that is acting of the object which is perpendicular to the surface the object is in contact with.
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Answer:
C~
Explanation:
Fn is normal, if it's negative then it's most likely -Fn.
Have a good day.
For typical rubber-on-concrete friction, what is the shortest time in which a car could accelerate from 0 to 70 mph? suppose that μs=1. 00μs=1. 00 and μk=0. 80μk=0. 80
The shortest time in which a car could accelerate from 0 to 70 mph is 3.193 seconds.
To find the answer, we have to know more about the friction.
How to find the shortest time?We have the expression for final velocity as,[tex]v=u+at[/tex]
It is given in the question that,[tex]v=70mph=31.29m/s\\1mile=1609.3m,1hour=3600s\\u=0\\k_s=1\\k_k=0.8[/tex]
It is given that; the car could accelerate from 0 to 70mph. Thus, acceleration will be,[tex]a=g*k_s=9.8*1=9.8m/s^2[/tex]
Thus, the shortest time will be,[tex]t=\frac{v-u}{a} \\t=\frac{31.29}{9.8}=3.193s[/tex]
Thus, we can conclude that, the shortest time in which a car could accelerate from 0 to 70 mph is 3.193 seconds.
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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?.
160 W rate it will radiate.
What, using an example, is absolute temperature?The Kelvin scale, where 0 represents absolute zero, is used to measure absolute temperature. The temperature at which matter's particles move the least and cannot cool down is known as the zero point (minimum energy)
What is the temperature's absolute value?The lowest energy state for a thermodynamic system is absolute zero. In terms of temperature, it is equivalent to 459.67 °F in Fahrenheit and 273.15 °C in Celsius.
Why is absolute temperature used?The temperature of an object on a scale where 0 is assumed to be absolute zero is known as its absolute temperature, also known as thermodynamic temperature. The Kelvin and Rankine scales measure absolute temperature.
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When you apply a force, f, to an object you get an acceleration of 2m/s2. If you apply the same force to an object with twice the mass, what is the acceleration? m/s.
The consequent acceleration, in, is caused by doubling the net force, F, acting on the same object.ms^-2 is going to 2a.What is net force?The vector sum of the forces exerted on a particle or body is known as the net force. As with all actual forces combined, its corresponding torque, or net force, forms the resultant force and affects the object's rotational motion. A torque-free resultant force may be defined by a system of forces.Learn more about net force with the help of given link:https://brainly.com/question/18038995#SPJ4
The acceleration would be 1m/s²
What is Force?
putting pressure to a door to push or pull it. Because force is a vector variable, it has both magnitude and direction. Force is defined as the "product of mass and acceleration of a body," in accordance with Newton's second law.
Acceleration - any process that alters velocity. There are only two ways to accelerate: changing your speed or changing your direction, or changing both. This is because velocity is both a speed and a direction.
if the force applied is f
the mass of the object is m
and acceleration is a = 2m/s²
so the relation will be,
f = ma
f = m×2
ATQ,
Now, when mass is 2m
a = f/m
a = 2m / 2m
a = 1 m/s²
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What happens to the appearance of an object as it gets hotter?
a. the object gets fainter.
b. the object gets brighter.
c. the object gets redder.
d. the object gets bluer.
Answer:
d) the object gets bluer
blue wavelengths are shorter than red wavelengths (in the visible spectrum)
blue light will carry more energy than an equivalent amount of red light
The appearance of an object as it gets hotter is that the object gets bluer. Hence, option (d) is correct.
What is Wavelength?Wavelength is the separation between the equivalent points of two successive waves. When two points or particles are referred to be "corresponding points," it means that they are both in the same phase and have completed exactly the same portions of their vibration. Typically, the wavelength of transverse waves—those whose points advance at right angles to one another—is assessed from crest to crest or from groove to trough; for longitudinal waves—those whose points advance in the same direction—the wavelength is measured from compression to compaction or from rarefaction to rarefaction.
A wave train's speed (v) in a medium is equal to its frequency (f), hence the formula for wavelength is v/f. Wavelength is commonly represented by the Greek character lambda λ.
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Physics question about grade and static friction. Pls help, thanks!
a.
i. The angle for telegraph hill is 17.48⁰ii. The coefficient of static friction has to be no less than 0.315b.
i. The angle for Canton Ave. is 20.3⁰ii. The coefficient of static friction has to be no less than 0.37c.
i.The angle for Bradford Street is 22.3⁰ii. The coefficient of static friction has to be no less than 0.41What is a grade?A grade is the ratio of the vertical rise to horizontal run of a road
What is the coefficient of static friction?The coefficient of static friction is a number which shows the amount of friction between two surfaces.
a. i. Angle for Telegraph hillSince grade = rise/run
= tan θ
So, θ = tan⁻¹(grade)
Since grade for Telegraph hill = 31.5%
= 31.5/100
= 0.315
θ = tan⁻¹(grade)
θ = tan⁻¹(0.315)
θ = 17.48⁰
So, the angle for telegraph hill is 17.48⁰
ii. Coefficient of static friction for Telegraph hillFor no sliding the coefficient of static friction, μ ≥ tanθ
≥ tan17.48⁰
≥ 0.315
So, the coefficient of static friction has to be no less than 0.315
b. i. Angle for Canton Ave.Since grade = rise/run
= tan θ
So, θ = tan⁻¹(grade)
Since grade for Canton Ave. = 37%
= 37/100
= 0.37
θ = tan⁻¹(grade)
θ = tan⁻¹(0.37)
θ = 20.3⁰
So, the angle for Canton Ave. is 20.3⁰
ii. Coefficient of static friction for Canton Ave.For no sliding the coefficient of static friction, μ ≥ tanθ
≥ tan20.3⁰
≥ 0.37
So, the coefficient of static friction has to be no less than 0.37
C. i. Angle for Bradford StreetSince grade = rise/run
= tan θ
So, θ = tan⁻¹(grade)
Since grade for Bradford Street = 41%
= 41/100
= 0.41
θ = tan⁻¹(grade)
θ = tan⁻¹(0.41)
θ = 22.3⁰
So, the angle for Bradford Street is 22.3⁰
ii. Coefficient of static friction for Bradford StreetFor no sliding the coefficient of static friction, μ ≥ tanθ
≥ tan22.3⁰
≥ 0.41
So, the coefficient of static friction has to be no less than 0.41
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Hazel is analyzing the written information and the image she found. Figure 1 shows that low-frequency radiation is generally considered to be non-ionizing, while high-frequency radiation is generally considered to be ionizing. Use the drop-down menus to complete the statements that support this.
Low-frequency electromagnetic waves have (low-high)
energy. High-frequency electromagnetic waves have (low-high)
energy. High-frequency waves are (more-less)
likely to ionize an atom because of their greater (energy-speed)
.
High-frequency waves are (more-less) likely to ionize an atom because of their greater (energy speed) for low- radiofrequency is generally considered to be non-ionizing, while high- radiofrequency is generally considered to be ionizing.
Microwaves and radio waves are examples of radiofrequency (RF) radiation, which is at the low-energy end of the electromagnetic spectrum. It belongs to the non-ionizing radiation class. Non-ionizing radiation lacks the energy to expel an atom's electrons.
A minimally invasive procedure known as radiofrequency ablation, or RFA, reduces the size of tumors, nodules, and other growths in the body. RFA is used to treat a variety of ailments, such as benign and cancerous tumors, chronic venous insufficiency in the legs, and persistent back and neck pain.
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If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected?.
The voltage remain constant
According to Ohm's Law:
V = IR
If we halved the resistance let:
R'=R/2
then
I'=21 in order to kept the Voltage same. Also the resistance is the opposition to the current. So, if resistance will halved then obviously current will double
So when we put these value in to Ohm's Law the results is:
V'=I'R'
V'=21(R/2)
V'-IR which is equal to first voltage. Hence,
V'=V
So, the voltage remains same
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By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are:____.
The wire's magnetic field lines are circles that are perpendicular to the wire and have their centers on the wire.
What is Right hand rule?According to Fleming's Right Hand Rule, if the thumb, forefinger, and middle finger are arranged in a straight line on the right hand.The thumb will point in the direction of the conductor's motion in relation to the magnetic field.The forefinger will point in the direction of the magnetic field. And the middle finger will point in the direction of the induced current.What is magnetic field?The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field.Learn more about magnetic field here:
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Savanna regions developed during the Triassic period.
Please select the best answer from the choices provided
T
F
How many joules of energy will a stock tank heater rated at 1500 watts use in a 24 hour period?
A stock tank heater rated at 1500 watts will use 1,29,600 kJ of energy in a 24 hour period.
Given :
Power = 1500 WTime = 24 hours = 24 x 3600 sec = 86,400 secWe know that
Energy = Power x time
E = P * t
E = 1500 x 24 x 3600
E = 129600000 J ( or 129600 kJ)
Hence, a stock tank heater rated at 1500 watts will use 1,29,600 kJ of energy in a 24 hour period.
The formula that links energy and power is:
Energy = Power x Time.
The unit of energy is the joule, the unit of power is the watt, and the unit of time is the second.
If we know the power in watts of an appliance and how many seconds it is used we can calculate the number of joules of electrical energy which have been converted to sortie other form.
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Question 9 of 10
Which of the following is an example of the strong nuclear force acting in an
atom?
A. A proton repelling a proton
B. A neutron attracting a neutron
C. A neutron repelling an electron
OD. An electron attracting a proton
A atomic neutron particle that is attracting another atomic neutron is an example of the strong nuclear force acting in an atom (Option B).
What are nuclear forces?The expression 'nuclear forces' makes reference to the attraction between different subatomic particles in a given nucleus of a particular atom, which represents the strongest force in the universe.
Subatomic particles include positively charged particles (i.e., protons), neutrally charged particles called neutrons, and electrically negative charged particles called electrons (e-).
In conclusion, a atomic neutron particle that is attracting another atomic neutron is an example of the strong nuclear force acting in an atom (Option B).
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The development of fusion energy has not been successful so far because of the high temperatures needed for fusion to occur. It’s not clear when we will have the technology to accomplish this. Do you think the government should continue to fund fusion research? Give your reasons.
Government should continue to fund fusion energy research because:
it potentially will produce large amounts of energyscientific research could discover more feasible methods of fusion energy productionit is a very clean form of energyWhat is fusion energy?Fusion energy is the energy produced from fusion reactions.
Fusion reactions are a type of nuclear reaction in which small atomic nucleus are fused together to produce larger atomic nucleus with the release of large amounts of energy.
The Sun produces its energy from fusion reactions between hydrogen atoms to produce helium nucleus. This reaction takes place at very high temperatures.
It is important that the government continue to fund fusion energy research because:
it potentially will produce large amounts of energymore scientific research could discover alternative cheaper methods of fusion it is a very clean form of energyIn conclusion, the continuous government funding will make it possible to finally discover cheaper and more feasible ways to produce fusion energy.
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What observational evidence supports the idea that mercury once shrank by some 20 kilometers in radius?
The voltage between two parallel plates separated by a distance of 3. 0 cm is 120 v. The electric field between the plates is?
The electric field between plates is 4000V/m.
An electric field (sometimes E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles.
The value of the electric field has dimensions of force per unit charge. In the metre-kilogram-second and SI systems, the appropriate units are newtons per coulomb, equivalent to volts per metre.
The voltage between points A and B is
V=E.d
E =V/d (uniform E- field only)
where d is the distance from A to B, or the distance between the plates.
Given:
distance d = 3 cm
voltage V = 120 V
Electric field E = V/d
E = 120 V / 3cm
E = 40 V / 1 cm [ 1 cm = 1/100 m ]
E = 4000 V/m.
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Part a a calorimeter consists of an aluminum cup inside of an insulated container. The cup is weighed on a top-loading balance and is found to have a mass of 31. 91 g. A reaction is conducted in the calorimeter, raising the temperature from 21. 2 c to 26. 1 c what is the change in heat q for the aluminum cup in units of j? aluminum has a specific heat of 0. 903 j 1 ? 1 write your answer to the correct number of significant figures.
The change in heat q for the aluminum cup is 141 J.
What is Specific heat?A substance's heat capacity is the amount of heat needed to increase its overall temperature by one degree. The heat capacity is known as the specific heat capacity or the specific heat if the substance's mass is unity.
change in heat -
The amount of heat Q that is transported to create a temperature shift depends on the substance and phase involved, the mass of the system, and the magnitude of the temperature change. (A) The temperature change and the amount of heat transported are directly inversely related.
The answer's sign dig is determined by a calculation's lowest sign digits.
The solution will need 3 digits because the temperatures are provided with 3 significant digits and the specified heat has 3 significant digits (the mass has 4 significant digits).
31.91 g * 0.903 J/g-C * (26.1 - 21.2 C) = 141 J
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Suppose i create a two-slit interference pattern using light with some wavelength lambda and slits with some separation d. If i were to increase lambda, what would happen to the interference pattern on the wall?.
If we increase the wavelength (λ), fringe width will increase and the interference pattern on the wall will spread out.
What is two - slit interference?The double or two-slit interference is a demonstration that light and matter can display characteristics of both classically defined waves and particles.
It also displays the fundamentally probabilistic nature of quantum mechanical phenomena.
During a two-slit interference experiment, a beam of light is aimed at a barrier with two vertical slits.
The fringe width is given by the relationfringe width = λ L / D
where;
λ is wavelength of light used, L is distance of wall from the source of light and D is slit separation.Thus, if we increase the wavelength (λ), fringe width will increase and the interference pattern on the wall will spread out.
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If one oscillation has 5. 8 times the energy of a second one of equal frequency and mass, what is the ratio of their amplitudes?
The ratio of their amplitudes will be 2.41.
To find the answer, we have to know more about the simple harmonic motion.
How to find the ratio of their amplitudes?It is given that,[tex]E_1=5.8E_2\\m_1=m_2 \\\omega_1=\omega_2[/tex]
We have the relation between these quantities and amplitudes as,[tex]A=\sqrt\frac{2E}{k} \\k=m\omega^2[/tex]
Here, for both the oscillation, k will be same.Thus, the ratio of amplitude will be,[tex]\frac{A_1}{A_2} =\sqrt{\frac{E_1}{E_2} } =\sqrt{\frac{5.8E_2}{E_2} } =2.41[/tex]
Thus, we can conclude that, the ratio of their amplitudes will be 2.41.
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The reason the position of a particle cannot be specified with infinite precision is the?
The reason the position of a particle cannot be specified with infinite precision is the uncertainty principle .
The position of a particle moving in a straight line is a vector which represents a point P on the line in relation to the origin O. The position of a particle is often thought of as a function of time, and we write x(t) for the position of the particle at time t.
The Heisenberg uncertainty principle is a law in quantum mechanics that limits how accurately you can measure two related variables. Specifically, it says that the more accurately you measure the momentum (or velocity) of a particle, the less accurately you can know its position, and vice versa.
The uncertainty principle (for position and momentum) states that one cannot assign exact simultaneous values to the position and momentum of a physical system. Rather, these quantities can only be determined with some characteristic “uncertainties” that cannot become arbitrarily small simultaneously
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Research how generators and transformers are used. Explain how faraday’s law is applied and why the designs are practical and therefore widely used?
The “Generators” generate current, and transformers convert between current and voltage. According to Faraday's law, the magnetic flux enclosed by a closed path changes at a time rate whose negative is equal to the electromotive force surrounding the way.
Generators are machinery that transforms mechanical energy into electrical energy. A static device called a transformer is used to move electrical energy from one circuit to another. Magnetic coupling and electrical separation characterize a transformer.
A fundamental property of electromagnetism known as Faraday's law of induction describes how a magnetic field will interact with an electric circuit to produce an electromotive force or electromagnetic induction.
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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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