Cepheids cataclysmic variables object is the period-luminosity relation used for determining distances.
What is Cepheids cataclysmic variables?Cepheid Variables are very bright stars that are 500–300,000 times as bright as the sun. They undergo brief variations every 1–100 days. They are pulsing variables that follow a predetermined pattern and experience rapid expansion and contraction. Other pulsating variables include RR Lyrae stars, which are short period, older stars that are not as massive as Cepheids; and RV Tauri stars, which are super giants with higher light fluctuations. Astronomers may study the variability of a Cepheid's brightness to determine its distance.
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A body is projected vertically upwards with a speed 100 m/s from the ground then distance it covers in its last second of its upward journey in meters is
The distance travelled by the body on last second of its upwards journey is 4.935m
What is projectile motion?
A projectile is an object or particle that is launched toward the surface of the Earth and moves along a curved path only under the influence of gravity.
To solve this question, consider the horizontal distance to be H and
distance traveled by the body in the last second be d
[tex]H=U^{2} /2g[/tex]
[tex]H=100^{2} /2*9.8[/tex]
H=510.2m
Now time taken to reach a height of
510.2 m= [tex]\sqrt[n]{2H/g}[/tex]
=10.2 seconds
Now,
[tex]s=ut+1/2gt^{2}[/tex]
[tex]H-d= (100)(t-1)-1/2g(t-1)^{2}[/tex]
[tex]510.2-d=100*9.2-1/2*9.8*9.2^{2}[/tex]
d=4936m
So, the correct answer is '4.936m'.
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Ernest rutherford was a prominent scientist who contributed significantly to the theory of atomic structure. True or false?.
Ernest rutherford was a prominent scientist who contributed significantly to the theory of atomic structure. Yes, the following statement is true.
Ernest Rutherford is considered one of the greatest scientists and experimentalists who worked on the atomic model and is also known for his contribution to nuclear physics.
he discovered that an atom is composed of three fundamental particles i.e. electrons, protons, and neutrons.
Most of the spaces are empty in an atom while its all mass is confined in a dense positively charged area called the nucleus.
Moreover, he also discovered alpha and beta radiations emitting from uranium.
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This means the evidence is valid on its face, or based on the evidence, and the elements :_____
Prima facie means the evidence is valid on its face, or based on the evidence, and the elements.
What is prima facie?Prima facie, a Latin phrase that means "at first glance" or "based on first impression," The feminine versions of primus, which means "first," and facies, which means "face," both in the ablative case, would be translated literally as "at first face" or "at first appearance." "On the face of it" is a typical translation in contemporary, colloquial, and conversational English.
Prima facie refers to the initial appearance of enough supporting evidence to establish a case, and it is used in modern legal English (both in civil law and criminal law). Prima facie evidence is a term used in common law regimes to describe evidence that, absent rebuttal, would be sufficient to establish a certain claim or fact. In academic philosophy, the phrase is used similarly.
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When managers establish accurate measuring and monitoring systems to evaluate how well the organization has achieved its goals, they are engaging in the essential task of _______.
Managers do the crucial duty of controlling when they create precise measuring and monitoring methods to assess how well the firm has achieved its goals.
What do you understand by monitoring systems?Software that assists system administrators in monitoring their infrastructure is known as a monitoring system. These tools keep an eye on the hardware, software, and traffic of the system and raise the alarm in the event of errors or disturbances. There are several monitoring systems available, ranging from commercial software to freeware.
The monitoring system broadcasts a signal and logs information about the signal, including whether it was received, how long it took the host to receive it, whether any signal data was lost, and other details.
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Need the answer badddd without this app I’d be screwed
Answer:
B
Explanation:
The first modern personality test was the Woodworth Personal Data Sheet, which was first used in 1919. It was designed to help the United States Army screen out recruits who might be susceptible to shell shock.
so, B is correct
Answer:
The answer is B, I hope this helps.
Two solid metal balls all have the same radius. one is made of aluminum, the other of gold. if the balls are resting at the bottom of a pool of water, which ball has the largest buoyant force?
The buoyancy force on the gold ball will be more than that of aluminum.
What is buoyancy force?An upward force applied by a fluid against the weight of an item that is partially or totally submerged is known as upthrust, also known as buoyancy. Pressure in a fluid column increases with depth due to the weight of the fluid on top.
Given that two solid metal balls all have the same radius. one is made of aluminum, the other of gold. And the balls are resting at the bottom of a pool of water.
The buoyancy force at the bottom force will be calculated by finding the density of the balls.
Buoyancy force = Volume inside water x Density X g
Density of gold = 19.3 g / cc
Density of aluminium = 2.7 g / cc
Since the density of the gold ball is more than the density of the aluminum ball.
Therefore, the buoyancy force on the gold ball will be more than that of aluminum.
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To include a css file in an html document, you use the _______________________ element.
To include a css file in an html document, you use the link element.
While CSS determines the look and layout of a website, HTML defines its content and organisational structure. Together, the two languages make it possible to build a well-organized, useful website.
What kind of selection would you employ to make a specific HTML element reference?The id selector chooses a particular HTML element by using the id property. The id selector is used to choose a single distinct element since each element's id is distinct inside a page. A hash (#) character should be written after the element's id in order to pick it.
How may CSS be added to HTML?There are three techniques to include CSS in HTML documents: Using the style property inside HTML elements is known as "inline." Utilizing a "style" element in the "head" section is one internal method. External – by linking to an external CSS file using the link> element.
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A water pump with a power of 3.4 × 102 watts lifts water at the rate of 7.5 × 10-2 meters/second from a water tank. What is the force exerted by the pump on the water?
Answer:
P = W / t work / time = power
P = F * S / t
F = P t / S force required
F = P / (S / t) since given .075 meters / sec
F = 340 J/sec / .075 m/sec = 4530 J / m = 4530 Newtons
4. Apply Scientific Reasoning Four boys push
on the front, back, and sides of a shopping
cart. The boys in the front and on the two
sides push with a force of 60 N. The boy in
back pushes with a force of 50 N. Which way
does the cart move?
The body would be moved in the forward direction by a net force of 10N.
What direction does the cart move?We know that force is a vector quantity. This implies that it has both magnitude and direction. The net force that acts on a body is the resultant force and this is the force that would move the object in a given direction. The object moves in the direction of the net force.
We are told that the forward force = 60 N
The backwards force = 50 N
We now have to determine the net force in order to understand the direction in which the body would move.
Net force = 60 N - 50 N = 10 N
It then follows that the body would be moved in the forward direction by a net force of 10N.
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Assortative mating changes ______ frequencies but does not change ______ frequencies.
Allele frequencies are unaffected by assortative mating, but genotype frequencies .
Assortative mating:Individuals with similar phenotypes and genotypes mate with others more frequently than is anticipated under a random mating pattern in assortative mating, which is a mating pattern and a type of sexual selection.
Frequencies of genotypes:A population's genotype frequency is calculated by dividing the number of people having a particular genotype by the overall population size. The genotype frequency in population genetics is the frequency or ratio (i.e., 0 f 1) among genotypes inside a population.
The frequency for alleles in biology:The term "allele frequency" describes the prevalence of an allele in a population. It is calculated by calculating the number of times the allele occurs in the population and dividing by the sum of all the gene copies.
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An electron not only moves around the nucleus but also on its own axis, thus generating a tiny field. The direction of this field is described by the quantum number, ms, which is not related to any specific orbital but is a property of the electron itself. True or false?.
Yes, the given statement is true.
An electron not only moves around the nucleus but also rotates on its own axis, thus generating a tiny magnetic field. The direction of the field is described by the spin quantum number, ms, which is not related to any specific orbital but is a property of the electron itself.
An atom is made up of three fundamental particles electrons, protons, and neutrons, and a positively charged nucleus. In an atom, electrons rotate on their axis as well as aorund the nucleus.
The rotational movement of electrons around the nucleus creates a magnetic field.
However, the magnetic forces cancel out each other due to the opposite spins of the electrons.
similarly, in a wire, the movement of electrons generates a magnetic field around the wire.
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What does your answer indicate about the total resistance of a parallel circuit with three resistors, compared to the resistance of the circuit with a single resistor?
The total resistance of a Parallel circuit with three resistors will be one third times lesser than the resistance of the circuit with single resistor.
What are resistors?A resistor is a passive two-terminal electrical component used in circuits to implement electrical resistance. Resistors have a variety of purposes in electronic circuits, including lowering current flow, adjusting signal levels, dividing voltages, biassing active components, and terminating transmission lines.
High-power resistors that can generate many watts of heat instead of electrical energy can be utilized as test loads for generators, power distribution systems, and motor controls. With temperature, time, or operating voltage changes, fixed resistors’ resistances only slightly fluctuate.
Variable resistors can be utilized as force sensors, heat sensors, light sensors, volume controls, lamp dimmers, humidity sensors, and chemical activity sensors.
What are the types of combination of resistors?When two or more resistances are connected between two points and each has a different current direction, the resistances are said to be connected in parallel.
In such circuits, the branches intersect at a common location, causing the current to branch out and then recombine.
When two or more resistances are connected end to end and the same current passes sequentially through all of them, this is referred to as a series connection. The total resistance in this situation is equal to the entire number of Individual resistances included in the series combination.
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Two 10-cm-diameter charged rings face each other, 18.0 cm apart. both rings are charged to 40.0 nc . what is the electric field strength?
The electric field strength = 1104.31 N/C
How do magnetic waves function?When charged particles, including electrons, are accelerated, an electromagnetic field, also known as an EM field, is created. Electric fields surround all electrically charged particles. Particles in motion generate magnetic fields.
Where can I find electromagnetic fields?Electromagnetic fields can be found throughout our environment yet are undetectable to the eye. Electric fields are created by the local accumulation of electric charges inside the atmosphere caused by thunderstorms.
According to the given information:diameter of rings, d = 10 cm
Distance between the rings, r = 18 cm
Charge of the rings, q = 40 nc
The electromagnetic field strength at the rings' midway is computed as follows:
E[tex]_n_e_t[/tex] = E₁ - E₂
E[tex]_n_e_t[/tex] = E₁(₊ve) - E₂(-ve)
The strength of the electric field at the center of a left ring is computed as follows;
[tex]E=\frac{k q L}{\left(R^2+L^2\right)^{3 / 2}}\\[/tex]
E = [tex]E=\frac{9 \times 10^9 \times 20 \times 10^{-9} \times 0.18}{\left(0.05^2+0.18^2\right)^{3 / 2}}[/tex]
E = 1104.31 N/C
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What is the maginitude of the average velocity of the particle between t = 1.0 s and t = 4.0 s
The correct answer for the maginitude of the average velocity of the particle between t = 1.0 s and t = 4.0 s is 0.67 m/s .
The average velocity concept was used to solve this problem.First, use the figure to calculate the distance and time required.The average velocity is then calculated using the time interval and total displacement. Average velocity is a measure of displacement over time. This is also known as the average rate of change in position over time.
The average velocity is as follows:
The velocity is denoted by v = (v 2-v 1) / (t 2- t 1)
t 1 = 4 sec
t 2 = 1 sec
t2 - t1 = 4 seconds - 1 second = 3 seconds
x1 = 2 m
x 2 = 0 m
x 2- x1 = 2 m
The velocity formula is v = (x 2- x1) / (t2- t 1)
the answer = 0.67 m/s
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Based on the data provided, the intracellular molarity of dissolved solutes in sweet potato cells is approximately ________.
a) 0.2 m
b) 0.4 m
c) 0.6 m
d) 0.8 m
Answer:
0.4 M
Explanation:
Just did mastering bio :)
A steadily flowing stream of water is funneled into a graduated cylinder for exactly 30 s, during which time 50 ml is collected. what is the volumetric flow rate of the stream? the mass flow rate?
The stream has a mass flow rate of 1.666 g/sec and a volumetric flow rate of 1.666 ml/sec.
What is the mass known as?The dimensionless quantity mass is used to represent the amount of matter contained in a particle or object (symbolized m). The kilogram is the chosen unit of mass according to the International System (SI) (kg).
How is the mass determined?The following equation can be used to determine mass = volume * density. It is possible to gauge the gravitational force acting on a mass by determining its weight. The Newton (N) is the SI unit of weight (N).
Briefing:t= 30 sec
V= 50ml
Volumetric flow rate = V/t
= 50ml/30sec
= 1.666 ml/sec
We know density of water= 1g/cm³
= 1 g/ml
So, mass flow rate = V/t
= 1g/ml * 50ml/30sec
= 1.666 g/sec.
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a) How far did the vehicle travel in total?
I need help on how to count each distance please
The total distance travelled during the vehicle's journey as found from the speed-time graph is 6.125 m
V = d / t
V = ( u + v ) / 2
V = Average Speed
d = Distance
t = Time
u = Initial velocity
v = Final velocity
During the first 0.5 s, u = 0 and v = 1 m / s.
d = ( 0 + 1 ) * 0.5 / 2
d = 0.25 m
During the next 0.5 s, u and v are equal meaning constant velocity ( V = 1 m / s ).
d = 1 * 0.5
d = 0.5 m
During the next 1 s, u = 1 m / s and v = 1.5 m / s.
d = ( 1 + 1.5 ) * 1 / 2
d = 1.25 m
During the next 2.5 s, u and v are equal meaning constant velocity ( V = 1.5 m / s ).
d = 1.5 * 2.5
d = 3.75 m
During the next 0.5 s, u = 1.5 m / s and v = 0.
d = ( 1.5 + 0 ) * 0.5 / 2
d = 0.375 m
Total distance travelled is the sum of all the individual distances calculated.
Total distance travelled = 0.25 + 0.5 + 1.25 + 3.75 + 0.375
Total distance travelled = 6.125 m
Therefore, the total distance travelled during the vehicle's journey as found from the speed-time graph is 6.125 m
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What is true about an object as its temperature increases?a. the object's atoms lose heat. b. the object's atoms gain kinetic and elastic potential energies. c. the object's atoms gain heat.
When temperature of an object is increases then the objects atom gain kinetic energy and elastic potential energies.
Kinetic energy- It is the energy of an object due to its motion.
Example - All moving object possesses kinetic energy due to their motion.
Elastic potential energy - it is the energy stored in a spring that has been stressed or compressed from its natural length.
Example - An Archers stretched bow.
Heat is a form of both potential and kinetic energy.
Temperature helps in thermal expansion which result in higher collision between particles. It increases the kinetic energy of the molecule.
an object as its temperature increases then the object's atoms gain kinetic and elastic potential energies.
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You are preparing a performance review and have the following measurement at hand: pv = 300; ac = 200; and ev = 250. what is cpi of the project? group of answer choices 0.80 1.25 1.50 0.83
The correct option is (b) 1.25
The CPI of the project is 1.25. Earned Value (EV) is divided by Actual Cost (AC) to determine CPI.
CPI is calculated as follows: EV / AC. In this case, 250 / 200 = 1.25.
The CPI measures the effectiveness of project resources in relation to the project budget. Earned Value is divided by Planned Value to calculate SPI. SPI evaluates how well resources are performing in relation to the project schedule.The cost performance index (CPI) is a gauge of how closely the realized value of the job actually accomplished matches the costs really incurred: CPI = EV / AC. The actual progress (earned value) in comparison to the expected progress is measured by the schedule performance index (SPI) = EV / PVThe departure from the project's expected cost is measured using the CPI. SPI is the variance from the project's projected completion date. The project is over budget if the CPI is less than 1. Project is running late if SPI is less than 1.Learn more about the CPI and SPI with the help of the given link:
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A sheet metal screw holding a metal body panel has pierced the insulation of a power wire and is touching the copper strands. this is known as a:_________
A sheet metal screw holding a metal body panel has pierced the insulation of a power wire and is touching the copper strands, this is known as a short to ground.
A substance called insulation is used to block sound and air. Insulation is used in the walls and attic of a home to keep warm air inside and cold air outside during the winter. An example of insulation is fibreglass. noun.
Covering anything in order to prevent heat, sound, or electricity from leaving or entering; also, the state of being covered in this manner: The animal's thick coat serves as excellent insulation from the arctic cold.
Any of the aforementioned alternatives would be safer than insulating your home with small glass shards doused in formaldehyde when compared to fibreglass insulation. However, cellulose is the most secure choice available.
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Notice a small hydraulic jump at location where the channel has a width of 5 m. at the crest of the jump the depth appears to be about 1 m. what is the flow rate?
A small hydraulic jump at location where the channel has a width of 5 m. at the crest of the jump the depth appears to be about 1 m, Fr = 1.
Hydraulic Depth is the area of a cross-section divided by the highest width. Hydraulic Width is especially useful for irregularly shaped channels (not rectangular), as seen within the equation for calculating the Froude Number.
A hydraulic jump may be a phenomenon within the science of hydraulics which is often observed in open channel flow like rivers and spillways. When liquid at high velocity discharges into a zone of lower velocity, a rather abrupt rise occurs within the liquid surface.
Hydraulic jump, Sudden change in water level, analogous to a blast wave, commonly seen below weirs and sluice gates where a smooth stream of water suddenly rises at a foaming front. The very fact that the speed of water waves varies with wavelength and with amplitude ends up in a large type of effects.
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Suppose with 200 n of force applied horizontally to your 1500 n refrigerator that it slides across your kitchen floor at a constant velocity. what are the friction forces on the refrigerator?
Think about a point item (or particle) that is moving horizontally while being affected by a net force that is not zero. The object's acceleration is inversely proportional to its mass and to the strength of the applied force.
Known data:
The word "force" has a specific meaning in science. At this level, calling a force a push or a pull is entirely appropriate. A force is not something an object "has in it" or that it "contains." One thing experiences a force from another. There is no distinction between living and non-living things in the concept of a force.
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Compare the ball's accelerations, both direction and magnitude, immediately after they leave her hand. is one acceleration larger than the other? or are the magnitudes equal?
Both balls soon after they left her palm experienced the same amount of acceleration, but in opposite directions.
Further equation :We define acceleration a as the rate of change of velocity with respect to time for linear motion:
a = dv/dt = d²x/dt²
According to Newton's second law, a force F is required to accelerate a mass m:
F= ma
The forces exerted on the ball govern its acceleration. There is just one force acting on both balls at the moment they are released from the student's hand: gravity. Therefore, the amount and direction of the acceleration of both balls are the same:
F = mg with,
|g| = 9.81 m/s², pointing straight down.
Both balls soon after they left her palm experienced the same amount of acceleration, but in opposite directions.
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A solar eclipse when the moon is at its far end of orbit, leaving a ring of light around the black circle of the moon is called a(n):_________
A solar eclipse when the moon is at its far end of orbit, leaving a ring of light around the black circle of the moon is called a ring of fire.
When the moon passes in front of the sun and casts a shadow on Earth, there is a solar eclipse. Only during the new moon phase, when the moon travels squarely between the sun and Earth and casts shadows on its surface, can a solar eclipse occur.
The North and South Poles are unable to view total solar eclipses. Solar eclipses that are nearly identical occur every 18 years and 11 months. There can be two to five solar eclipses per year, depending on the Sun, Moon, and Earth's geometry. One to two years can pass between complete solar eclipses.
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Why are astronomers interested in building observatories capable of detecting neutrinos, cosmic rays, and gravitational waves?.
Astronomers are interested in building observatories capable of detecting neutrinos, cosmic rays, and gravitational waves because these are not forms of light, they can provide information about the objects that emit them that light cannot.
Astronomers study the heavens at X-ray wavelengths using satellites and earth-orbiting observatories. Because X-rays and gamma rays are absorbed high in the Earth's atmosphere, instruments to observe this radiation must be placed in orbit above the atmosphere.
Astronomy relies on electromagnetic radiation to help us see the universe. It allows us to see (visual light) on Earth. Pulsars, for example, emit X-rays but not visible light, which is how we know they exist. Neutrinos are also made up of energy, but they are made up of radioactive decay.
This enables scientists to measure them despite the fact that they can pass through almost anything without being noticed. Gravitational waves are disturbances caused by the curvature of space that expand at a specific rhythm or "force" that travels at the speed of time. Because they can all be measured without being light, they are ideal for being found in space to create more knowledge about the universe.
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Swings of the amusement park rotate with a constant speed. what is the direction of acceleration experienced by a rider?
The direction of acceleration experienced by a rider will be toward the center of the circle.
What is Centripetal Acceleration ?Centripetal acceleration is the acceleration experience by a body moving in a circular path which is always toward the center of the circle.
Centripetal acceleration a = v² / r
Given that swings of the amusement park rotate with a constant speed. The velocity of the swing will not be constant because of the different directions the swing velocity will experience.
The direction of acceleration experienced by a rider will be centripetal acceleration which will always in the direction toward the center.
Therefore, the direction of acceleration experienced by a rider will be toward the center of the circle.
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An ion of aluminum has a charge of 3 . the ion contains 10 electrons. how many protons does a neutral atom of aluminum possess?
a. 3
b. 10
c. 13
d. 16
The correct toption is (C) 13
The neutral atom of aluminum possess 13 protons.
Aluminum, denoted by the letter Al, is a group 3 element on the periodic chart. Total weight is 27 kilos. Since the number of electrons and protons in a neutral atom are equal, an aluminum atom that is neutral or uncharged has 13 electrons, 13 protons, and 14 neutrons. Keep in mind that the product of protons and electrons determines mass.The solution to this is that a 3+ charge on an aluminum ion means that an aluminum atom has lost three electrons, or 13 electrons - 3 electrons = 10. An aluminum atom will consequently have 10 electrons because it has a +3 charge. The fact that an aluminum atom possesses 13 protons when it is in a neutral state is unaffected by this.Learn more about the quantum mechanics with the help of the given link:
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What is the energy change when an electron in a hydrogen atom jumps from n = 2 to n = 5?
The energy change when an electron in a hydrogen atom jumps from n = 2 to n = 5 is 2.028×10 −19J.
What is hydrogen atom?A hydrogen particle is an iota of the synthetic component hydrogen. The electrically nonpartisan particle contains a solitary decidedly charged proton and a solitary adversely charged electron bound to the core by the Coulomb force. Nuclear hydrogen comprises around 75% of the baryonic mass of the universe. A hydrogen molecule is an iota of the compound component hydrogen. The electrically unbiased iota contains a solitary decidedly charged proton and a solitary adversely charged electron bound to the core by the Coulomb force. Nuclear hydrogen is around 75% of the baryonic mass of the universe.
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Can you articualte the different elemants of a software architecture and solutions at a basic level ?
In essence, yes. Despite the fact that the majority of people believe software architecture and design to be distinct.
What is software architecture?A system's architecture outlines its main parts, their connections (structures), and how they work together. There are several contributing variables to software architecture and design, including business strategy, quality attributes, human dynamics, design, and IT environment.
Software Architecture and Software Design can be divided into two separate stages: Software Architecture and Software Design. The functional needs in architecture cast and separate nonfunctional considerations. Functional needs are fulfilled in design.
A system's architecture acts as a blueprint. It establishes a communication and coordination mechanism among components and offers an abstraction to control the complexity of the system.
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A hockey puck is set in motion across a frozen pond. if friction and air resistance are ignored, how much force is required to keep the puck sliding at constant velocity? *
A hockey puck is set in motion across a frozen pond, if friction and air resistance are ignored, zero newton force is required to keep the puck sliding at constant velocity .
What is a friction?The force preventing solid surfaces, fluid layers, and sliding material components from moving in the same direction is known as friction. Friction between two surfaces causes kinetic energy to be converted into thermal energy when they move in relation to one another (that is, it converts work to heat). The utilization of friction produced by rubbing pieces of wood together to start a fire serves as an example of how this attribute can have dramatic effects. When a viscous fluid is agitated, for instance, kinetic energy is transformed into thermal energy. Wear, which can result in component damage or performance degradation, is another significant effect of various types of friction. Tribology is a field of study that includes friction.
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