We can easily experience black body in practical.
What is black body?
A black body or blackbody is the an idealized physical of the body that absorbs all to the incident of a electromagnetic radiation, regardless of frequency or angle of incidence. The probability is a name "black body" is given because it is absorbs all colors of light. A black body also emits the black-body radiation.
A body which completely absorbs all heat radiation incident on it is called perfectly black body. A perfectly black body can not be realised in practice but materials like Platinum black or Lamp black come close to being ideal black bodies. Such materials absorbs 96% to 85% of the incident radiations.
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the horse's center of gravity is not exactly in its middle; it is closer to its front hooves. what does this tell us about the force exerted by the front and back hooves at equilibrium?
At equilibrium, the forces exerted by the front and back hooves must be equal, but the force exerted by the front hooves will be slightly greater than that of the back hooves.
What is equilibrium?
Chemical equilibrium refers to the situation inside a chemical reaction where both the reactants are present at levels that have no further habit of changing over time, preventing any discernible change in the system's properties. Whenever the forward reaction and the reverse reaction move forward at the same speed, this condition results. The forward as well as backward reactions typically have equal, if not zero, reaction rates. The concentrations of a products and reactants do not change on a net basis as a result. Dynamic equilibrium is the name given to such a situation.
This is due to the fact that the horse's center of gravity is closer to the front hooves, and thus the front hooves must exert a greater force in order to keep the horse balanced.
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What do you predict would happen if you brought a negatively charged balloon next to an uncharged piece of paper?.
Answer:
The paper will be attracted to the balloon.
Explanation:
A negative charge represents an excess of electrons. If a negatively charged balloon is brought next to an uncharged piece of paper, the negatively charged electrons would repel the negatively charged electrons present in the molecules on the surface of the paper. This would cause an asymmetric distribution of electrons in the molecules of the paper. The asymmetric distribution would cause a momentary dipole in the affected molecules, with the positive pole oriented toward the balloon. The cumulative effect would be an attractive force between the negatively charged balloon and the uncharged paper.
If a series circuit has two loads of 8 ohms and 4 ohms what do you know about their voltage drops.
The voltage drops will have the ratio of 2 : 1
Assuming the loads have the same power factor, the voltage drop will be proportional to the load impedance. The loads have a ratio of 8 : 4, 2 : 1, so the voltage drops will have a ratio of 2 : 1
What is voltage drop ?Voltage drop is the reduction in electrical potential along an electrical current's path in a circuit. Because some of the energy supplied is lost, voltage drops in the source's internal resistance, across conductors, across contacts, and across connectors are undesirable.
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you are given force and distance, you can determine power if you know
O joules
O energy
• time
• watts
btw answer is not joules
You are given force and distance, you can determine power if you know time.
What is force?
A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Power is work done per unit time so, we need time to measure power.
You are given force and distance, you can determine power if you know time.
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you drop a rock from a cliff. you know the acceleration due to gravity is -9.8 m/s2. what speed is the rock traveling after two seconds?
By 2 seconds after it starts falling, its velocity is 19.6 m/s (9.8 m/s + 9.8 m/s), due to acceleration due gravity.
What is Gravitational Acceleration?
The acceleration an object experiences as a result of gravitational force is known as acceleration due to gravity. M/s2 is its SI unit. Its vector nature—which includes both magnitude and direction—makes it a quantity. The unit g stands for gravitational acceleration. At sea level, the standard value of g on earth's surface is 9.8 m/s2.
What is gravity?
A body is drawn toward the centre of the earth by the force of gravity. Let's have a look at two bodies with masses ma and mb. When two bodies are subjected to equal forces, the force in terms of mass is given by: The inertial mass of a body is defined as mb = ma [aA/aB].
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g why are the electric field lines of force perpendicular to the surfaces of conductors in an electrostatic situation?
The electric field lines of force perpendicular to the surfaces of conductors in an electrostatic situation because the electric field is created by the movement of electrons in the conductor. Electrons move in a plane perpendicular to the surface of the conductor, so the electric field is also perpendicular to the surface.
Electric field lines are the imaginary lines which gives the exact idea of electric field.
They are always perpendicular to the surface because according to electrostatics the charges should be at rest but if the electric field lines are not normal then there would be a component of force that would cause the unbalanced force which is absurd in electrostatics.Due to the unbalanced nature of this force, surface currents, or the movement of charges, will be executed so to prevent this situation the electric field must emerge perpendicular to surfaces.
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a manufacturer of air compressors claims that the lifetime of their compressors under typical use has a mean life of 60 monthswith a standard deviation of 4 months, but the comparable air compressors from the competing manufacturer has a mean life of55 months with a standard deviation of 10 months. suppose we randomly select 64 compressors from this manufacturer and 80
The null hypothesis for this comparison is that the two manufacturers have the same mean lifetime for their compressors.
What is compressor?
A compressor is indeed a mechanical device that lowers a gas's volume while raising its pressure. One particular kind of gas compressor is an air compressor. Pumps and compressors share characteristics in that both raise the pressure on a fluid and can move it through a pipe. The primary difference is that a compressor works to change a fluid's density or volume, which is typically only possible with gases. Compressors are frequently used for gases because liquids cannot be compressed as much as gases can. A pump's primary function is to pressurise and move liquids. To increase discharge pressure, many compressors can be staged, which involves repeatedly compressing the fluid in small steps or stages.
To test this hypothesis, we can use a two-sample t-test. Assuming that the two samples are independent and normally distributed, the test will yield a p-value. If the p-value is less than 0.05, then we can reject the null hypothesis and conclude that the two manufacturers have different mean lifetimes for their compressors.
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a 2 kg ball is revolving 35 times per minute around a circle with a 25 cm radius. what is the centripetal force?
The centripetal force acting on the ball revolving 35 times per minute around a circle with a 25 cm radius is 1.68 N
What is centripetal acceleration?
The characteristic of an object's motion when it travels along a circular-path is known as centripetal acceleration. Centripetal acceleration is the term for any moving object whose acceleration vector is directed toward the center of the circle.
The following informations are given in the question,
mass of the ball, m = 2kg
radius of the ball, r = 25 cm
= 0.25 m
time, t = 60 seconds
No of revoutions completed by the ball = 35
We know, Velocity = (No of revolutions x 2 π r )/t
= 35 x 2 x π x 0.25/ 60
= 0.46 m/s
The acceleration is, a = v^2/r
= 0.46 x 0.46/0.25
=0.84 m/s^2
The required centripetal force = 2 x 0.84
= 1.68 N
Hence, the Centripetal force is 1.68 N
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unless otherwise stated in the nec, rules affecting conductors are based on which type of conductors?
Rules affecting conductors are based on Copper and aluminum conductors.
Basically, conductors are the material that is used for the flow of current.
The main reason behind this is free electrons. All the conductors contain large no of free electrons in them which help in the flow of current from one point to another point. Copper and aluminum are the materials that are used as a conductor because they contain large numbers of free electrons and the cost of these materials is also not that much higher as compared to other conductors. Copper and aluminum conductors are easily available materials. Conductor size and area of the materials are also matters which is predefined by the National Electrical Code (NEC). According to the rules of NEC, materials are selected as a conductor. Rules affecting conductors are based on Copper and aluminum conductors.
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following long term potentiation, does the same amount of neurotramsitter relase from the presynatpic neuron cause an increased responsed in the postsynaptic neuron
A substantial body of research has shown that the main neuromodulatory neurotransmitters dopamine (DA), norepinephrine (NE), and acetylcholine (ACh) affect LTP magnitude at the cellular level.
After long-term potentiation has taken place, what happens?There are more AMPA receptor sites present when long-term potentiation takes place, but the presynaptic neuron also appears to undergo long-lasting modifications. After the long-term potentiation has been established, the terminal buttons of the neurons involved release more neurotransmitter.It is believed that a key mechanism underlying learning and memory is long-term potentiation (LTP) of synaptic effectiveness. A substantial body of research has shown that the main neuromodulatory neurotransmitters dopamine (DA), norepinephrine (NE), and acetylcholine (ACh) affect LTP magnitude at the cellular level.To learn more about Long-term potentiation refer to:
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an electron moves with velocity v in a direction opposite to the direction of the current in the neighboring long wire. what is the direction of the magnetic force acting on the electron?
An electron moves with velocity v in a direction opposite to the direction of the current in the neighboring long wire the direction of the magnetic force acting on the electron is perpendicular.
We can don't forget this diagram the use of the proper-hand rule. If you factor your pointer finger withinside the course the superb price is transferring, after which your center finger withinside the course of the magnetic area, your thumb factors withinside the course of the magnetic pressure pushing at the transferring price.
The magnetic pressure on a current-wearing cord is perpendicular to each the cord and the magnetic area with course given via way of means of the proper hand rule.Moving electric powered costs produce magnetic fields. F = qv × B. The pressure F is perpendicular to the course of the magnetic area B. It is also perpendicular to the course of the rate v.
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1. find the correlation between the eeg signal and a 15 hz sinusoid and a 25 hz sinusoid. is the eeg signal more similar to a 15 hz sinusoid or a 25 hz sinusoid?
The correlation between an EEG signal and a 15 Hz sinusoid and a 25 Hz sinusoid can be determined by calculating the cross-correlation of the signals.
What is correlation?
Any statistical relation between different random variables as well as bivariate data, whether causal or not, is referred to in statistics as correlation or dependence. Although "correlation" can mean any kind of association inside the broadest sense, in statistics it typically refers to the strength of a pair of variables' linear relationships. Examples of common dependent phenomena also include relationship between parent and child height and the relationship between a good's price and the number of units consumers seem to be willing to buy, as shown in the as such demand curve.
The higher the correlation, the more similar the signals are. Therefore, the EEG signal is more similar to the sinusoid with the highest correlation.
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q2. an object moves in a straight line at a constant speed. is it true that there must be no forces of any kind acting on this object? explain.
It is not true there must be no forces acting on an object that moves in a straight line at a constant speed. All forces act on an object in balanced.
If an object moves in a straight line at a constant speed it means the object has uniform motion. According to Newton's first law if the forces that act on an object in balanced (∑F = 0) so there are two condition
If the object is at rest, it will stay at rest.If the object is in motion, it will stay in motion with a constant speed in a straight line.So there must be forces acting on an object. But, all forces work in balanced.
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Blocks A and B of masses m and 2m, respectively, are connected by a light string and are pulled along a horizontal surface of negligible friction by a horizontal force of magnitude F, as shown in the figure. The tension in the string is T. If the masses of the blocks are doubled, and the magnitude of the horizontal force remains the same, the tension in the string will be:
As a result, the tension inside the string will remain the same when the mass of the blocks is doubled and the force being applied remains constant.
What does interpersonal conflict mean?Tension arises whenever there is apprehension, mistrust, and a potential for an unplanned act of violence or conflict. The likelihood that the confrontation between the two countries will continue is high. Conflict, hostility, unease, and antagonism are synonyms for this word. more phrasal verbs for tension.
What does stress mean in real life?Tension is the term used to describe the physical and mental stress that comes along with life's events. Stress can be caused by either happy or unhappy circumstances and can manifest as physical, mental, or emotional symptoms.
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An electronic cover letter should be _____.a.colorful and flashyb.simple and basicc.long and boringd.messy and brief
An electronic cover letter should be simple and basic.
An electronic cover letter should be written simple and straightforward. It also should be persuasive. In other words, it should make a compelling argument for a company to recruit you. It should use a "you" approach, describing how your history, experience, and personal attributes might benefit the organization. Many writers are hesitant to use the word "I" in a cover letter.
In addition, your cover letter's body paragraphs should convey your unique interest in the electrician position. It should also express your gratitude and respect for the employing company. Explain why you want this job and why it is a good fit for you. Then, briefly describe your relevant achievements.
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two speakers are emitting identical sound waves with a wavelength of 4.0 m. the speakers are 8.0 m apart and directed toward each other, as shown:
Constructive, Destructive, and Something in Between, per the provided statement.
What are frequency and wavelength?The distance between two wave crests, which also applies to troughs, is known as the wavelength. The unit of frequency in frames a second (Hz), which is the quantity of vibrations that cross a specific area in a second (Hertz).
What is the name for a light wavelength?The horizontal space between the wave's two peaks is known as a wavelength. Light's wavelength is used to measure it (in nanometers). Typically, wavelengths in the 400–700 nanometer (nm), or one hundred thousandth of a meter, range are considered to be visible light.
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30 pts!
A straight current-carrying wire is held in an exactly vertical direction. In order to produce a clockwise magnetic field around the wire, the current should be passed in the straight wire...
from bottom to top.
from left to right.
from top to bottom.
from right to left.
The current should be passed in the straight wire from top to bottom, to produce a clockwise magnetic field.
option C is the correct answer
What is Fleming's right hand rule?Fleming's right hand rule states that if we stretch the thumb, forefinger and the middle finger of right hand at right angles to one another in such a way that the forefinger points in the direction of magnetic field.
Based on the Fleming's right hand rule, holding a current carrying wire in your right hand, such that the thumb points in the direction of the current, then the direction in which the fingers wrap the wire will represent the direction of the magnetic force.
Thus, in order to produce a clockwise magnetic field around the wire, the current should be passed in the straight wire from top to bottom.
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a mechanical high-speed bat is flying along a path perpendicular to a wall. it emits a sound with a frequency f0 . the night is clear and the air is still. let the speed of sound waves in the still air be vs . the bat hears a sound wave reflected from the wall with a frequency fnew . from this information one can determine the speed vbat at which the bat is flying. install a detector at the wall.
The speed vbat at which the bat is flying is vbat = (1/5) * vs
What is the frequency?
The frequency of a repeating 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 emphasize differences between spatial and angular frequencies, respectively.
Observed frequency f = (v + vr) * f0 / (v + vs)
given speed of sound v = vs
speed of receiver vr = 0
speed of source vs = - vbat ( - ve as the bat is approaching the wall)
a. 1. f1 = (vs/(vs − vbat))*f0
b. for the bat the wall is emitting waves at f1
fnew = {(vs + vbat) / vs} * f1
7. fnew = (vs + vbat/(vs))*f1
c. fnew = {(vs + vbat) / vs}*f1
= {(vs + vbat) / vs} * {vs/(vs − vbat)}*f0
(3/2) * f0 = (vs + vbat) / (vs - vbat) * f0
3 * vs - 3 * vbat = 2 * vs + 2 * vbat
=> vbat = (1/5) * vs
4. vbat = (1/5) * vs
Hence, the speed vbat at which the bat is flying is vbat = (1/5) * vs
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Sketch curves representing the variation of the molar Gibbs free energy with temperature at the pressure corresponding to a triple point for an element. Repeat this sketch for a pressure slightly above and slightly below the triple point. Also draw the curves at 100 atm and compare.
J .Willard Gibbs created a new function that is now known as the Gibbs potential or Gibbs energy change (G). Pressure and temperature fluctuations have no effect on this function.
The Gibbs energy change of a system depends only on its current state, not on how it got there.
At constant pressure and temperature, a thermodynamic system can perform its maximum (or reversible) amount of work, which is referred to as Gibbs energy. In terms of thermodynamics, reversible work refers to a unique technique that ensures the system is in complete equilibrium with its surroundings.If both the extensive properties (U, G, and A) and the intensive properties (temperature and pressure) are constant, a thermodynamic system is said to be in equilibrium. Or there is no change overall in any of the properties. According to the following equation, the system is said to be at equilibrium if the reaction is reversible and the Gibbs free energy is zero.
A + B ⇄ C + D
ΔrG = 0
It is also known as the Gibbs energy for a reaction in its standard state.
0 = ΔrG + RT in K
ΔrG = - RT in K
or
ΔrG = - 2.303RT in K
ΔrG = ΔrH - TΔrS = - RT in K
For endothermic reactions, the value of ΔrH should be high and positive; if K is less than 1, little of the product is expected to form. The value of ΔrH is big and negative in the case of an exothermic reaction, and even the value of ΔrG is likely to be large and negative. When this occurs, the value of K will be significantly more than 1. Strong exothermic processes will supposedly have a higher value of K. Kilo Joule, which is frequently denoted as kJ/mol, is the unit used to measure Gibbs free energy.
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TRUE/FALSE. private corrections firms are not part of the government bureaucracy and therefore do not have to contend with the massive amount of paperwork that can clog government organizations.
The statement that private corrections firms are not part of the government bureaucracy and therefore do not have to contend with the massive amount of paperwork that can clog government organizations is a true statement.
Bureaucracies are made up of experts, offices that perform tasks.
They are the instruments that enable the government to manage efficiently some essential functions.
Some may argue that their existence is obsolete, yet.
Bureaucrats have administrations for enforcing their own rules:
They also enable executive powers to be carried. Not only enforcing rules, but also creating rules. When people disobey the rules, bureaucracies punish for deviating from the norms.
The public policies are enforced by the bureaucracies, and although many and large bureaucracies may result, their existence is still needed for the governments to ensure that federal and state laws act in coordination.
Therefore, the statement that private corrections firms are not part of the government bureaucracy and therefore do not have to contend with the massive amount of paperwork that can clog government organizations is a true statement.
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it is often recommended that you let your car engine run idle to warm up before driving, especially on cold winter days. while the benefit of prolonged idling is dubious, it is certainly true that a warm engine is more fuel efficient than a cold one. explain the reason for this
It is certainly true that a warm engine is more fuel efficient than a cold one and it is because the engine warms up to an efficient temperature faster than a cold one.
What is Engine?This is also referred to as motor and is known as a machine which is designed or set up to convert one or more forms or types of energy into mechanical energy.
In the case of a warm engine , there is usually more fuel efficiency than a cold one when compared which is because engine warms up to an efficient temperature faster thereby saving fuel in the vehicle or machine involved.
This is therefore the reason why it is often recommended that you let your car engine run idle to warm up before driving, especially on cold winter days thereby making it the correct choice.
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o generate the hypochlorous acid, you will use 0.6 molar equivalents of oxone (which equates to 1.2 molar equivalents of the active oxidizing agent, khso5 )
The presence of hypochlorous acid must be established by a chemical test, the potassium iodide-starch test.
How does potassium iodide test work?It is a typical experiment to use iodine to check for the presence of starch. A bright orange-brown hue can be seen in a solution of potassium iodide (KI) and iodine (I₂) in water. The hue turns deep blue when it is put to a sample that includes starch, as the bread in the preceding image. Plants contain the carbohydrate known as starch. It is made up of two different kinds of polysaccharides, each of which is composed of glucose units joined in one of two ways. One is called branching amylopectin, and the other is called linear amylose.The substance that gives the color blue is called amylose. Iodine can be bonded inside the helix-shaped structure that its chain takes on.To learn more about iodine test, refer to
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in the video, the torque due to the mass of the plank is used in the calculations. for this question, ignore the mass of the board. rank, from largest to smallest, the mass mm needed to keep the board from tipping over. to rank items as equivalent, overlap them. view available hint(s)
Sort the mass m required to prevent the board from toppling over from largest to smallest. Overlap items to rank them equally. Disregard the board's bulk. Sort the mass m required to prevent the board from toppling over from largest to smallest. Sort the required mass to prevent the board from toppling over from largest.
What is torque?
When an engine exerts itself, torque, which is a twisting force, speaks to the rotational force of the engine and quantifies how much of twisting force is available. Everyday activities like turning a doorknob, opening a soda bottle, and use a wrench, or peddling a bicycle all involve torque.
Overlap items to rank them equally. Due to its angular momentum, the earth revolves around the sun. If the earth were to be stopped in its orbit and then allowed to fall directly toward the sun. I received a ton of information regarding the of the sun and earth from the questioner.
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what is the angular momentum lcm of the system before the collision, with respect to the center of mass of the final system?
The exact point of an object measured from all its edge.
What is center of mass?
the center of mass of a distribute of mass in space is the unique point where the weighted relatively position of the devided mass sums to 0. This is a point to which a force of may be applied to cause of a linear acceleration it without an angular acceleration.
Most of the time (not everytime)the centre of mass of an object lies within the object itself.
Eg-the center of mass of a ball in middle of a ball and the centre of mass of a copy is middle of a copy.
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f an electron rotates around the nucleus at that radius, what would be its speed according to the planetary model? (enter your answer in terms of c.)
According to the planetary model, the speed of an electron revolving around the nucleus is given as follows;
v = e/√4[tex]\pi[/tex]∈₀mr.
The orbital speed of an electron, orbiting around a nucleus in a circular orbit of radius 50 consistent with the Bohr model, regularly called a planetary version, the electrons encircle the nucleus of the atom in precise allowable paths referred to as orbits. whilst the electron is in one of these orbits, its energy is fixed.
The ground nation of the hydrogen atom, wherein its electricity is lowest, is whilst the electron is inside the orbit that is closest to the nucleus. The orbits which can be similar to the nucleus are all of the successively extra power. The electron isn't allowed to occupy any of the areas in between the orbits. A regular analogy to the Bohr version is the rungs of a ladder pa is 2. 2×106ms−1.
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consider the following statements and determine if true or false. false a spontaneous electrochemical reaction will always have a positive voltage false w
Yes this statement is true about electrical resistance.
What is electrical resistance ?
electrical resistance is a force that counteracts the flow of current.
Sol- when two lamps are connected in parallel to a battery, the total electrical resistance that the battery senses is more than the resistance of either . Beacuse In a parallel circuit each bulb is in its own circuit. As bulbs are added the resistance in the circuit decreases since each circuit is another pathway for electrons to move from one end of the circuit to the other.when two lamps are connected in series to a all the battery the electricals resistance that the battery's senses is the more than the resistance of either lamp.
As each bulb is connected in parallel to the battery, each has the same potential difference across it as the all of voltage across the battery of the terminals. All other to the potential differences are zero, as all the wires have to the zero resistance.
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Although ________ satellites are the most expensive to build and launch, they also have the longest orbital life of many years.
Medium Earth Orbit Satellites are the most expensive to build and launch but have the longest orbital life.
A medium Earth orbit Satellites(MEO) is an Earth-centered orbit that is between 1,243 and 22,236 miles (1,243 km) above sea level and is higher than a low Earth orbit (LEO) but lower than a high earth orbit (HEO).
In contrast to the boundary between MEO and LEO, which is an arbitrary altitude determined by recognized practice, the boundary between MEO and HEO is the specific altitude of a geosynchronous orbit, in which a satellite circles the Earth once every 24 hours, or one full revolution of the Earth. All MEO satellites have orbital periods that are fewer than 24 hours, with the shortest periods (for circular orbits at the lowest MEO altitude) being under 2 hours. Solar radiation pressure, which affects satellites on MEO orbits,
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Professor bloom discusses an example where two squares appear different colors although they are the same. What is the explanation for this bias?.
Our brain compensates when we see two squares far away from one another
What is the reason for seening different colors ?Surprisingly, the answer is that squares A and B are the same color, but that your perception of them as different is based on the information about the surrounding colours and shadows.
Professor Bloom claims that this bias results from the brain trying to make up for two squares that are far apart, which he claims is the reason why two squares appear to have different colours when they are actually the same.
Because they absorb some colours (wavelengths) while reflecting or transmitting others, objects appear to be different colors. Our perception of colour is based on the wavelengths that are reflected or transmitted.
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Why must microwave towers generally be spaced no more than 30 miles apart to ensure the transmitter and receiver are able to have line-of-sight of each other?.
The distance between stations can only be greater than the visual horizon, or between 30 and 50 miles, due to the requirement of a line of sight (48 to 80 km). The second reason is because, quite surprisingly, microwave networks may have lower latency than fiber, as we have already hinted at.
What is the purpose of a microwave tower?A physical transmission tool called a microwave antenna is used to send microwave signals between two or more places. Antennas are used for radio astronomy, electronic warfare, and broadcasting in addition to other applications.
What function does the microwave antenna serve in the mobile tower?A key system component that enables a microwave system to send and receive data between microwave sites is a microwave antenna. They are typically found at a tower's summit.
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How did dark matter contribute to the formation of galaxies?.
The gravitational pull of dark matter led to the formation of protogalactic clouds.
Computer models created by scientists to understand how galaxies form show that galaxies form when dark matter coalesces and condenses. Dark matter is invisible matter, and the total mass of the universe is about five times that of normal matter. Scientists believe that dark matter may be responsible for the unexplained movements of stars within galaxies.
Computers play an important role in dark matter data exploration. This allows scientists to create models that predict the behavior of galaxies. Satellites are also used to collect dark matter data. Without dark matter radiation would keep the galactic structure from clumping together for too long essentially wiping it out, and keeping the universe smooth and homogeneous. Our solar system and galaxies are essential to our lives.
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