It takes 3.16s to hit the bottom of the well.
Calculationg = 9.8 m/[tex]s^{2}[/tex]
y = 9.8t m/[tex]s^{2}[/tex]
y = [tex]\frac{9.8 t^2}{2}[/tex] = 4.9[tex]t^{2}[/tex] m
When y =49, we have to find t
49 = 4.9[tex]t^{2}[/tex]
10 = [tex]t^{2}[/tex]
t = [tex]\sqrt{10}[/tex] = 3.16 s
Motion under gravityGravity causes a body to descend faster, and as it does, the air resistance that slows it down rises.
This keeps happening until the weight of the object and the force of air resistance are equal. The terminal velocity is the pace at which the item now falls instead of accelerating any longer.
What do you mean by motion in a gravitational field?When an object moves, it is said to be in motion under gravity since gravity has an impact on the object’s motion.
GRAVITY is the force that pulls things downward. In actuality, gravity pulls objects toward the Earth’s center.
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Hich physical law underlies the first law of thermodynamics? conservation of matter increase in entropy conservation of energy conservation of work
Conservation of energy describes law of thermodynamics.
Energy can be converted from one form to another, but it cannot be created or destroyed. According to the rule of conservation of energy, the total energy of any isolated system (for which energy and matter transfer over the system boundary is not feasible) is constant.
deltaU=Q-W
where Delta U}\Delta U denotes the change in the internal energy of a closed system (for which heat or work through the system boundary are possible, but matter transfer is not possible), Q denotes the quantity of energy supplied to the system as heat, and W denotes the amount of thermodynamic work done by the system on its surroundings
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A car moving with constant acceleration covers the distance between two points 120 m apart in a time of 8.0 s. its speed at the second point is 12 m/s. what is the speed of the car at the first point?
The speed of the car at the first point is 18 m/s.
How do we calculate the initial speed?
The equation we can be used for finding the speed of the first point is:
⇒ Δx = ½ (v + v₀)t
From this we can easily calculate v₀ i.e,
⇒ v₀ = 2Δx/t - v
According to the question it is given that,
Distance between two points is , Δx =120 m,
Time t = 8.0 s,
Speed at second point is, v = 12 m/s,
Speed at first point is, v₀ = ?
From above formula,
⇒ v₀ = 2Δx/t - v
= 2×120/8 - 12
= 240-96/8
= 144/8
= 18 m/s
Therefore the speed at first point is 18 m/s.
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A space traveller weighs herself on earth at a location where the acceleration due to gravity is 9.81 m/s29.81 m/s2 and finds a value of 515 n.515 n. what is her mass?
The mass of the space traveller on earth is calculated as 56.22 kg. The correct answer is 56.22 kg
What is force?
Force is termed as the product of mass and acceleration. Terms like stretch and squeeze also can be used to denote force. In Physics, force is defined as: The push or pull on an object with mass causes it to vary its velocity. Force is an external agent capable of adjusting a body's state of rest or motion. it's a magnitude and a direction.
Given information;
A space traveler weighs herself on Earth at a location where the acceleration due to gravity is 9.81 meters per second square.
And force applied on earth 551 N.
The value of mass can be determined by using the formula;
Force = Mass × Acceleration
Mass = [tex]\frac{Force}{Acceleration}[/tex]
Substitute all the values in the formula;
Mass = [tex]\frac{Force }{Acceleration }[/tex]
Mass = [tex]\frac{551}{9.81}[/tex]
Mass = 56.22 kg
Hence, the mass of the object is 56.22 kg
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two forces 3N and 4N act on a body in a direction due north and due East respectively calculate their equivalent
Two forces 3N and 4N act on a body in a direction due north From East, the equilibrant's angle is given by [tex]\theta=\tan ^{-1} \frac{3}{4}=36.8^{\circ}[/tex].
What are equilibrium and resultant force?The equilibrium force is the balanced force when the net force acting is zero and is the exact opposite of the consequent force. The resultant force is one single force replaced by numerous forces.
Briefing:3N and 4N are the two forces pulling on a body.
The forces work along the North and the East, which are perpendicular to one another.
The resultant of the forces, which is provided by the equilibrant force,
R = √(3)²+(4)²
R = 5N
From East, the equilibrant's angle is given by
[tex]\theta=\tan ^{-1} \frac{3}{4}=36.8^{\circ}[/tex]
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The path of motion of a thrown javelin is an example of
The path of motion observed during the javelin throw is an example of curvilinear motion.
What is curvilinear motion?When an object is thrown at a particular angle, the motion of an object is curved i.e, called curvilinear motion.
Example: A stone thrown into the air at a particular angle.
The javelin throw is a sport with a track and field event where a spear of 2.5m in length is thrown into the air at a particular angle. Thus considered an example of curvilinear motion
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-2,-9 reflected across the y axis??
Answer:
(2,-9)
Explanation:
Reflection over the y-axis:
As a general rule any point (x, y) reflected over the y-axis becomes ( -x, y)
The y-axis acts like a mirror.
Reflect (-2, 9) over the y-axis:
The point (-2,-9) reflected over the y-axis becomes point ( 2,-9)
A mass of 30.4 g stretches a spring up to 0.85 m as it hangs from the spring. what is the spring constant?
By using Hooke's Law, the spring constant is 0.358 N/m.
We need to know about Hooke's Law to solve this problem. Hooke's Law describes the force applied to spring (elastic materials) will proportional to spring constant and displacement under the elastic condition. It can be described as
F = k . x
where F is force, k is spring constant and x is displacement.
From the question above, we know that
m = 30.4 grams = 0.0304 kg
x = 0.85 m
Find the weight
W = m . g
W = 0.0304 . 10
W = 0.304 N
By substituting the given parameters, we get
F = k . x
W = k . x
0.304 = k . 0.85
k = 0.304 / 0.85
k = 0.358 N/m
Hence, the spring constant is 0.358 N/m.
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If the atomic mass of neon is 20 amu, how much neon would be needed to have an avogadro's number of neon atoms?
By Avogadro's number, the mass of Neon atom is 20 grams.
We need to know about Avogadro's number to solve this problem. Avogadro's number is the number that explains how many carbon atoms are in one mol. The Avogadro's number is
Na = 6,02 × 10²³ atoms / mol
From the question above, we know that
Mr = 20
N = 6,02 × 10²³ atoms
By using Avogadro's number, we can calculate how much Neon atoms
N = n . Na
6,02 × 10²³ = gr / Mr . 6,02 × 10²³
gr / 20 = 1
gr = 20 grams
Hence, the mass of Neon atom is 20 grams.
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In step 9 of the procedure, if you were asked to determine the mass of solution in a test tube, how would you measure this mass?
In order to calculate the mass of the solution, we use the formula
V = πr2h
What does a test tube weigh?After heating, the test tube and anhydrous hydrate weigh 17.05 g. The test tube weighs 15.81 g when it is empty. 1.24 g is the mass of anhydrous hydrate. 0.48 g of water is lost.
How would you calculate a test tube’s volume?Don’t factor in the glass’s thickness when reading. Using the following formula, determine the capacity of each test tube: V = r2h, where r (the radius) = ½ the diameter and = 3.14.
Your final computation should be rounded to the correct number of significant figures.
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In ernest rutherford's gold foil experiment, why did alpha particles sometimes (1 in 8,000) fly violently in a random direction?
In ernest rutherford's gold foil experiment, why did alpha particles sometimes (1 in 8,000) fly violently in the positive alpha particle were perfectly aligned to strike a nucleus.
In Rutherfords' experiment, the positively charged alpha particles were perfectly aligned to strike the nucleus. Thus they got deflected in a random direction due to repulsions between the positively charged nucleus and positively charged alpha particles.
Ernest Rutherford conducted this experiment in response to J.J. Thomson's plum-pudding model experiment.
A thin piece of gold foil, an alpha particle-emitting radioactive source, and a fluorescent screen that encircles the gold sheet were used in this experiment. He set the radioactive source in front of the gold sheet, which had a fluorescent screen surrounding it. Now, the alpha particle from that radioactive source bombarded this gold foil sheet.
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This is for Earth Space Science
One of the major events that contributed to Snowball Earth was the series of large volcanic eruptions that occurred 700 million years ago in what is now Canada. These eruptions caused ⎽⎽⎽(blank)⎽⎽⎽⎽⎽ particles to get trapped in the atmosphere. The particles blocked incoming solar radiation, which had a strong ⎽⎽⎽(blank)⎽⎽⎽ effect on the planet.
1. carbon dioxide; warming
2. sulfur gas; warming
3. sulfur gas; cooling
4. carbon dioxide; cooling
The words that complete the blanks are; carbon dioxide; warming. Option 1
What is volcanic eruption?The term volcanic eruption has to do with a situation in which molten magma suddenly bursts out of the earth and may solidify to give rise to the emergence of rocks. We know that rocks are the solid parts of the earth hat may occur above or below the earth's crust. During a large volcanic event. It is common that carbon dioxide is evolved into the atmosphere.
To complete the sentence; One of the major events that contributed to Snowball Earth was the series of large volcanic eruptions that occurred 700 million years ago in what is now Canada. These eruptions caused carbon dioxide particles to get trapped in the atmosphere. The particles blocked incoming solar radiation, which had a strong warming effect on the planet.
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The rigid beam is supported by a pin at c and an a992 steel guy wire ab of length 6 ft. If the wire has a diameter of 0. 2 in. , determine the distributed load w if the end b is displaced 0. 12 in. Downward. The wire remains elastic.
The length by which the guy wire stretches is; δ = 0.091 in
We are given;
Length of guy wire AB = 6ft = 72 in
Diameter of wire = 0.2 in
UDL = 200 lb/ft
From the free body diagram of the rigid beam system and the guy wire attached, we can say that;
Taking moments about point C gives;
∑Mc = 0; -(2000 * 5) + (F_BA * cos 30 * 10) = 0
-10000 + 8.66F_BA = 0
8.66F_BA = 10000
F_BA = 10000/8.66
F_BA = 1154.73 lb
Now, the length which it stretches is gotten from the formula;
δ = PL/AE
Where;
δ is change in length
P is Force
L is length of wire
A is area
E is modulus of elasticity of wire(steel) = 29000 ksi = 29000000 psi
A = πd²/4
A = π * 0.2²/4
A = 0.0314 in²
Thus;
δ = (1154.73 * 72)/(0.0314 * 29000000)
δ = 0.091 in
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If you drop an object in the absence of air resistance, it accelerates downward at 9.8 m/s^2. if instead you throw it downward, its downward acceleration after release is :________
The downward acceleration after release is 9.8 m/s^2.
What is the universal law of gravitation, or NLG?
Every particle of matter in the universe is drawn to every other particle by a force that varies directly with their combined masses and inversely with their distance from one another.
Whether an object is moving or at rest, gravity still exerts its force on it.
In the given case, the general equation is as follows:
s = s₀+v₀t+1/2g[tex]t^{2}[/tex]
where
s is referred to as position at time t,
s₀ is referred to as the initial position,
v₀ is referred to as the initial velocity,
g is referred to as the acceleration of gravity and
t is referred to as the elapsed time.
When the object leaves your hand, we would typically say that time is (t)=0.
An object initial velocity is increased when it is thrown, whereas it would be zero if it were simply dropped.
However, once it is out of your hand, gravity accelerates at the same rate in both directions. As a result, the downward acceleration is 9.8 meters per second squared.
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please help i need it fast
An equilibrium in a game in which players pursue their own self-interests and do not cooperate is called a:_________
The Equilibrium in a game in which players pursue their self-interests and do not cooperate is called as Non-Cooperative Equilibrium.
What is Non-Cooperative Equilibrium?As opposed to cooperative games, non-cooperative games feature individual player competition, and alliances can only function there if they are self-enforcing. It is conceivable to model cooperation using non-cooperative game theory and competition using cooperative game theory, since the terms "cooperative" and "non-cooperative" are merely technical phrases for the game theory that is used to model a game.
The primary differentiating factor is the lack of an outside authority to set norms mandating cooperative behavior. Players are unable to form coalitions without outside control (such as contract law), therefore they must face off against one another alone.
Hence, Non-Cooperative Equilibrium is the state of a game in which players just look out for themselves and do not collaborate.
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Given the s-n curve for 4340 steel, is there an endurance limit? if so, what is the stress value for the endurance limit? (4 pts)
The endurance limit is defined as the maximum amplitude. at Completely reversed stress that the standard Specimen Can Sustain for a 10° Cycle with out fatigue failure.
From the below graph,
[tex]10^6[/tex] cycles --> stress amplitude σ( MPa) = 750 M Pa
What is stress amplitude in fatigue?The fatigue strength is the stress amplitude at which failure occurs for a given number of cycles. N is the number of cycles required for a material to fall flat at a given stretch in order to extend fatigue life. S = Smax-Smin, the stretch runThe fatigue limit could be a stress amplitude threshold value. Stretch amplitudes below this level do not result in failure, whereas stretch amplitudes above the fatigue constraint result in crack initiation and split growth, which leads to failure. The fatigue strength is the stress amplitude at which failure occurs for a given number of cycles. N is the number of cycles required for a material to fail in fatigue life at a given stress range.The maximum amplitude is used to define the endurance limit. The standard specimen can withstand completely reversed stress for a 10° cycle without fatigue failure.To learn more about stress amplitude, visit;
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a car accelerates from rest to 22 m/s in 12.5 seconds. what distance does it cover in this time?
Answer:
Hope the picture helps you.............
This is for ESS(Earth Space Science)
The combination of low oxygen levels in the ocean and low carbon dioxide in the atmosphere led to cooling temperatures and the Late Devonian extinction, 380 million years ago. Many ocean dwellers went extinct, including ⎽⎽⎽(blank)⎽⎽⎽⎽⎽. In contrast, ⎽⎽⎽⎽(blank)⎽⎽⎽⎽ fared best since they were transitioning from sea to land and could survive in both regions.
1. trilobites; tetrapods
2. tetrapods; armored fish
3. trilobites; armored fish
4. tetrapods; trilobites
The combination of low oxygen levels in the ocean and low carbon dioxide in the atmosphere led to cooling temperatures and the Late Devonian extinction, 380 million years ago. Many ocean dwellers went extinct, including trilobites. In contrast, tetrapods fared best since they were transitioning from sea to land and could survive in both regions.
The tetrapods are characteristized by the possession of muscles and skeleton which aids support and movement respectively.
What are tetrapods?The tetrapods are referred to as vertebrates ( those animals with backbones) which have two pairs of limbs. That is, they have four different limbs
So therefore, The combination of low oxygen levels in the ocean and low carbon dioxide in the atmosphere led to cooling temperatures and the Late Devonian extinction, 380 million years ago. Many ocean dwellers went extinct, including trilobites. In contrast, tetrapods fared best since they were transitioning from sea to land and could survive in both regions.
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What is the weight, in n, of an object with a mass of 200 kg at a location where g = 9.6 m/s^2?
The gravitational force applied on the object or weight of the object is equal to 1920 N.
What is weight?
The force exerted on an object by gravity is known as the weight of the object in science and engineering. The gravitational force acting on the any object is referred to as weight in several common textbooks. Some people refer to weight as a scalar quantity that measures the gravitational force's strength. Others define it as the strength of the force that mechanisms that counteract the effects of gravity impose on a body.
In order to calculate the object's weight we just needed to multiply its mass with the given gravitational acceleration. Then after inserting the values for m and g we can obtain the solution.
So, we get equation
[tex]F = m \times g[/tex]
Putting values in the equation,
[tex]F = 200 \times 9.6[/tex]
We get the force,
[tex]F = 1920 N[/tex]
Therefore, the weight of the object is 1920 N.
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10.0 points
A reconnaissance plane flies 446 km away from
its base at 684 m/s, then flies back to its base
at 1026 m/s.
What is its average speed?
Answer in units of m/s.
007
The average speed in m/s, given the data is 820.80 m/s
What is speed?Speed is the distance travelled per unit. Mathematically, it can be expressed as:
Speed = distance / time
What is average speed?This is the total distance travelled divided by the total time taken to cover the distance.
Average speed = total distance / total time
How to determine the time taken to fly away from the baseDistance = 446 km = 446 × 1000 = 446000 mSpeed = 684 m/sTime to fly away =?Speed = distance / time
684 = 446000 / time
Cross multiply
684 × time = 446000
Divide both side by 684
Time = 446000 / 684
Time to fly away = 652.05 s
How to determine the time taken to return the baseDistance = 446 km = 446 × 1000 = 446000 mSpeed = 1026 m/sTime to return =?Speed = distance / time
1026 = 446000 / time
Cross multiply
1026 × time = 446000
Divide both side by 1026
Time = 446000 / 1026
Time to return = 434.70 s
How to determine the average speedTotal distance = 446000 + 446000 = 892000 mTime to fly away = 652.05 sTime to return = 434.70 sTotal time = 652.05 + 434.70 = 1086.75 sAverage speed =?The average speed can be obtained as follow:
Average speed = total distance / total time
Average speed = 892000 / 1086.75
Average speed = 820.80 m/s
Thus, the average speed is 820.80 m/s
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What is the potential difference across each capacitor,if they are connected to a 12 v batter?
It is discovered that the capacitor’s potential difference increases to 4.0 V in one second.
Does a capacitor have a different potential across it?There is a potential difference (p.d.) between the plates of a capacitor when it is completely charged, and the larger the area of the plates and/or the smaller the distance between them (known as separation), the greater the charge that the capacitor can carry and the greater the capacitance.
How are differences in potential calculated?Divide the resistance present in the circuit by the current flow rate.
The resulting number, expressed in volts, is the potential difference. Ohm's Law, or V = IR, is the name of this equation.
What is the difference in potential between parallel capacitors?With several parallel capacitors, the potential difference is the same, but the charge increases. Similar to adding resistance in series, paralleling capacitors increases effective capacitance.
Effective capacitance is calculated as effective capacitance = capacitance 1 + capacitance 2.
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A ball is thrown directly downward with an initial speed of 7.05 m/s, from a height of 29.9 m. after what time interval does it strike the ground? s
The ball that is thrown directly downward with an initial speed of 7.05 m/s, from a height of 29.9 m. takes 3.29 s to strike the ground
The formula for the downward vertical launch and the procedure we will use is:
t = {V₀ + [tex]\sqrt{}[/tex][(V₀)² + 2*g*y]}/ g
Where:
v₀ = initial velocityg = gravityy = heightt = timeInformation about the problem:
g = 9.8 m/s²v₀ = 7.05 m/sy = 29.9 mt= ?With the information gave, we can calculate the time from the ball is thrown, using the formula of downward vertical launch:
t = {V₀ + [tex]\sqrt{}[/tex][(V₀)² + 2*g*y]}/ g
t = {7.05 m/s + [tex]\sqrt{}[/tex][(7.05 m/s)² + 2*9.8 m/s²*29.9 m]}/ 9.8 m/s²
t = {7.05 m/s + [tex]\sqrt{}[/tex][49.70 m²/s² + 586.04m²/s² ]}/ 9.8 m/s²
t = {7.05 m/s + [tex]\sqrt{}[/tex][635.74 m²/s² ]}/ 9.8 m/s²
t = {7.05 m/s + 25.214 m/s}/ 9.8 m/s²
t = 32.26 m/s/ 9.8 m/s²
t = 3.29 s
What is vertical launch?In physics vertical launch is the motion described by an object that has been launched vertically in which the acceleration is the earth's gravitational force.
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A car accelerates from 5m/s to 20m/s in 2.5 seconds
Acceleration of the car is 6 m / s ².
a = ( v - u ) / t
a stands for acceleration
u stands for initial velocity
v stands for final velocity
Given ,
u = 5 m / s
v = 20 m / s
t = 2.5 s
a = ( v - u ) / t
a = ( 20 - 5 ) / 2.5
= 15 / 2.5
a = 6 m / s ²
Hence , Acceleration of car is 6 m / s ² .
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The given question is incomplete kindly refer below for complete question :
A car accelerates from 5m/s to 20m/s in 2.5 seconds . Find the acceleration of the car .
If a process removes heat from a system, must the system's temperature decrease in this process?
If a process removes heat from a system, must the system's temperature decrease in this process,
No the system's temperature could stay the same if there is work done on the system to exactly compensate for heat loss.Since heat removes = work done on the system then change in internal energy will be zero. hence there will be no change in temperature of the system. then Temperature of the system depend on the Internal Energy of the system.internal energy is the total amount of all potential and kinetic energyif a system is heated means that it gains internal energy and if loses heat means decrease in internal energyTo know more about internal energy visit : https://brainly.com/question/11278589
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When evaporating solvent from a solution by gently blowing compressed air on it, why is it helpful to warm the solution?
Solvent evaporation reduces the vapor pressure of the liquid by removing heat energy from the solution and container, cooling both as a result. Warming the remedy mitigates this
One way to separate the components of a mixture with a dissolved solid in a liquid is through evaporation. The liquid evaporation, or transforms from a liquid to a gaseous condition. It frequently calls for heat. The solid is all that remains after the liquid has entirely evaporated. The spontaneous passage of molecules from the liquid phase to the gas phase is known as evaporation. Condensation's opposite is evaporation.
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Why is an action potential conducted in only one direction, from an axon hillock to an axon terminal?
The action potential is conducted in only one direction because the brief refractory period inhibits reopening of voltage-gated Sodium (Na) channels.
There is a slight depolarization of the membrane potential which causes the sodium channels residing in the neuronal membrane to open. Therefore, the leading edge of more additional nearby sodium channels gets activated when an action potential is able to depolarize the membrane. This results in another depolarization spike, the leading edge of which opens up more nearby sodium channels, etc.
So, from the point of start, depolarization of waves propagates. The action potential then moves along an axon in every direction. Action potentials, however, go one way. This is due to the sodium channels' ability to close after activation, known as their refractory period. This movement guarantees that the action potential travels along the axon in a particular direction.
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From your observations in electrostatics i, what evidence is there for the existence of at least two varieties of charge? have you seen anything that shows that a third type of charge exists?
No there is nothing that shows third type of charge existence.
Why do we know there are two different kinds of charges?A few straightforward experiments can demonstrate the existence of two different types of charges. As it loses electrons to the silk cloth when the glass rod is rubbed against it, the glass rod becomes positively charged. The silk material acquires a negative charge.
Why are there two different types of fees?The physical characteristic of matter is its electric charge. It comes in both positive and negative forms. While opposite charges repel one another, like charges attract.
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Tech a says that friction bearings are made up of balls and rollers. tech b says that non friction bearings are in sliding contact between moving surfaces. who is correct?
Here in this question neither of them are correct. As the friction bearings are not made of balls and rollers. Also, non friction bearings are not in a sliding contact between moving surfaces.
In order to provide a low-friction support surface for rotating or sliding surfaces, friction bearings are composed of a stationary, non-moving bearing surface, such as machined metal or a pressed-in bushing.
Lubricating oil is frequently used in friction bearings to isolate the moving part from the mated non-moving bearing surface. An antifriction bearing uses rolling parts connected by inner and outer rings to absorb the radial forces acting on the rotor.
It is typically mounted to the shaft with an interference fit. Pumps and aero-derived gas turbines frequently use antifriction-type bearings.
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The average speed of a runner in a 352. meter race is 8.0 meters per second. How long did it take the runner to complete the race?
Of the four states of matter, which has particles that are the most tightly packed together?
O liquid
O solid
O gas
O plasma
Answer: In solids, the particles are tightly packed together. In liquids, the particles have more movement, while in gases, they are spread out. Particles in chemistry can be atoms, ions or molecules.
Explanation: hope this helps
solid state of matter is a particles which has the most tightly packed together.
