When the paint brush is dropped from the top the acceleration increases.
Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate.
An object in free fall experiences an acceleration of -9.8 m/s². Whether explicitly stated or not, the value of the acceleration in the kinematic equations is -9.8 m/s² for any freely falling object.
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mpulse is impulse is a force that is applied at a random time. a force that is applied very suddenly. the area under the force curve in a force-versus-time graph. the time interval that a force lasts
Impulse is the area, under the force curve in a force-versus-time graph.
What is impulse?Impulse is the integral of the force (F) over the time interval (Δt) over which the force acts. As force is a vector quantity so will be the impulse. Impulse applied on an object produces a vector change equivalent to its linear momentum, and the resulting direction is also changed. Impulse is the change in linear momentum of the body.
Two ways to calculate impulse:
Multiply force and time (F × Δt) Find the change in momentum (ΔP)Impulse is the area under the curve of a force versus time graph. The area above the time axis is positive Δp and the area below the axis is negative Δp. If the force is not constant, you can divide the graph into sections and add impulse to each section.
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A man throws a ball a maximum horizontal distance of 101m. The acceleration of gravity is 9.8 m/s^2. How far can ge throw the same ball vertically upward with the same initial velocity.
The same ball can be throw vertically upward height 50.5 m with the same initial velocity.
What is projectile motion?The movement of an object that has been launched into the air is known as projectile motion. Only gravity is felt by the item after the initial force that launches it. Projectile and trajectory both refer to the same thing: an object.
Given parameters:
maximum horizontal distance: R = 101m.
The acceleration of gravity: g = 9.8 m/s^2.
We have to find, maximum vertically upward with the same initial velocity by the ball; H =?
We know that, maximum horizontal distance travelled by a projectile: R = u²/g
So, u²/g = 101 m.
And, maximum height obtained by a projectile = u²/2g = 101/2 m. = 50.5 m.
Hence, the same ball can be throw vertically upward height 50.5 m with the same initial velocity.
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Did friction play a role? Do you believe you have demonstrated energy conservation and the work-kinetic energy theorem convincingly?
Yes, friction plays a role. Yes, I believe that proven conservation of energy and conservation of work-kinetic energy and the work-kinetic energy theorem.
The work-energy theorem, or the work-kinetic energy theorem, as I prefer to call it, says
Wnet=ΔK
Where K is kinetic energy and W represents work.
We require a comprehensive summation of all forces acting on an object, whether positive or negative, to obtain a reliable value for Wnet. Whatever is left after subtracting the losses (negative work such as friction) and any positive work done by the motive forces is given as the change in kinetic energy of the object.
Overall, energy is saved. According to this theorem, when an object slows down, its final kinetic energy is less than its initial kinetic energy, the change in its kinetic energy is negative, and so is the net work done on it. If an object accelerates, the net work done on it is positive. When calculating the mesh, you must include all the forces acting on the object.
If you omit any forces that act on the object, or if you include any forces that do not act on it, you will get the wrong result. The importance of the work-energy theorem, and the other generalizations it leads to, is that some types of calculations are much simpler than trying to solve Newton's second law.
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a simple ideal brayton cycle with air as the working fluid has a pressure ratio of 10. the air enters the compressor at 520 r and the turbine at 2000 r. accounting for the variation of specific heats with temperature, determine (a) the air temperature at the compressor exit, (b) the back work ratio, and (c) the thermal efficiency w/ regeneration od 80%
(a) Compressor discharge air temperature is 557.56K.
(b) Workback rate is 0.502.
(c) Thermal efficiency is 0.482 or 48.2%.
Solution:
The heat added to the air t the compressor is given by
Process 1 - 2 [tex]\frac{T_{1} }{T_{2} } = (\frac{P_{2} }{P_{1} } ) = (\frac{10}{1}) = 1.93[/tex]
Therefore T₂ = T₁ × 1.93 = 288.89 K × 1.93 = 557.56 K
(a) the air temperature at the compressor exit is 557.56 K
(b) The back work ratio is given by T₂ -T₁/T₃ -T₄
For the turbine, we have T₃ /T₄ = (rp) = (10) = 1.93
which gives T₄ = T₃/1.93 = 1111.11/1.93 = 575.705 K
Therefore the back work ratio = [tex]\frac{ 557.56 K -2.88.89k}{1111.11-575.705k}[/tex] = 0.502
(c) The thermal efficiency of a Brayton Cycle is given by
ncycle = [tex]1 -\frac{1}{r-1} = 1-\frac{1}{1.4-1} = 0.482[/tex]
The cycle efficiency = 0.482 or 48.2%
Molecules in a gas move away from each other when heated increasing the space occupied by the gas. As with anything that is pressurized, increasing pressure from the compressor will increase the temperature of the refrigerant. Heat waves are dangerous and can cause illnesses such as heat cramps, heat stroke, and even death. Rising temperatures could also lead to a chain reaction of other changes around the world.
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An archer shoots an arrow at a 75.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow, (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 35.0 m/s? (Although neglected here, the atmosphere provides significant lift to real arrows.) In this part of the problem explicitly show how you follow the steps in the Problem-Solving Strategy for projectile motion found on pages 65 and 66. (b) There is a large tree halfway between the archer and the target with an overhanging branch 3.50 m above the release height of the arrow. Will the arrow go over or under the branch?
The angle that must the arrow be released to hit the bull's eye if its initial speed is 35.0 m/s is 18.435°.
Velocity is the time price at which an item is transferring alongside a course, even as speed is the price and route of an item's movement. positioned some other way, velocity is a scalar fee, even as speed is a vector.
Calculation:-
here R = 75 m and u = 35 m/s
R = u²nsin2θ/g
therefore , 75 = (35)²sin2θ/9.8
⇒ 2θ = sin⁻¹(75 × 9.8/35²) = 36.87°
⇒ θ = 36.87/2 = 18.435°
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The relative ability of a bonded atom to attract shared electron pairs is called its _____. This ability _____ as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.
The relative ability of a bonded atom to attract shared electron pairs is called its electronegativity. This ability increases as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei.
Electronegativity is defined as the ability of an atom in a molecule to attract electrons to itself. The concept of an electronegativity scale for the elements was proposed by Pauling.
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a drag racer starts her car from rest and accelerates at 6.8 m/s 2 for the entire distance of 340 m. how long did it take the car to travel this distance? answer in units of s
Since the car is at rest, its starting speed is 0 m/s, its acceleration is 6.8 m/s2, and the distance the car must travel is 340 m. t =100s
How fast are they moving initially and ultimately?An object's initial velocity is the rate at which gravity exerts its first force on it. However, the final mass and velocity quantity that gauges the speed and direction of a moving object after it has reached the maximum level acceleration.
Is there a constant initial speed?The starting velocity of an automobile is zero while it is at rest. Its initial velocity would be greater than zero if a projectile is thrown into the area. The starting velocity will be greater than zero but will become zero if a car stops after pressing the brakes.
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Henry is trying to move his 232 kg refrigerator. He is pushing, but the refrigerator is not moving. If the maximum coefficient of friction between the refrigerator and the floor is 0.87, how hard does Henry have to push in order to get the refrigerator to move?
Answer:
Once the fridge is moving you are still applying the same push force but now the opposing friction (now kinetic) force is less.
What is the net force in this image?
Net force on the image is 0 Newton.
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.
Net upward force is balanced by net downward force so net force is zero.
Net force on the image is 0 Newton.
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What is the net force in this image?
a 160 turn coil has an area of 3 cm2 and rotates in a magnetic field of 0.5 t. (a) what frequency will generate a maximum emf of 10 v?
If we rearrange the circuit so that the inductor and capacitor were connected in series,the impedance would be Decreased and the resonant frequency would be unchanged.
What is frequency?
Frequency is the rate at which something occurs over a particular period of time or in a given sample.
Sol-An LC circuit is made up of an inductor (L) and a capacitor (C). At the resonance condition of the LC circuit, the inductive reactance XL. becomes equal to the capacitive reactance Xc.
It is defined as-
XL= 2πfL
Xc= 1/2πfC
So when reactance are equal we have-
XL=Xc
2πfL= 1/2πfC
f^2=1/4π^2LC
f=1/2π√LC
The resonance condition is the same for both the parallel and series LC circuit, so the resonance frequency will not change.
The impedance of a parallel LC circuit is:
Z(w)= jL w^2-w^2•/w
In a series LC circuit, when w
, the impedance becomes equal to 0.
Therefore the impedance of a series LC circuit will decrease and the resonant frequency will remain the same.
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a boy standing at one end of a floating raft that is stationary relative to the shore walks to the opposite end of the raft, away from the shore. as a consequence, the raft does which of the following? [hint: use conservation of momentum.]
If a boy standing at one end of a floating raft that is stationary relative to the shore walks to the opposite end of the raft, away from the shore, the raft will move towards the shore.
According to law of conservation of momentum, the total linear momentum of a closed system remains constant. Initially the raft is at rest, so the magnitude of momentum is zero. Because,
p = m v
p = Momentum
m = Mass
v = Velocity
If v = 0, p = 0
According to law of conservation of momentum, the final magnitude of this must be zero. So if the boy walks away from the shore, the raft must move towards the shore to maintain this zero magnitude.
Therefore, if a boy standing at one end of a floating raft that is stationary relative to the shore walks to the opposite end of the raft, away from the shore, the raft will move towards the shore.
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What caused the need for topographic maps to be updated?
There is the need for topographic maps to be updated because it makes resources and environment monitoring more significant
What is a Topographic map?This is referred to as a type of map which shows the shape of the Earth's surface through the use of contour lines. The geographical representation is also important in the socio-economic development of a country or place.
In developing countries , there is the need to monitor the resources and environment due to different changes occurring as a result of high human activity influence such as mining, pollution etc in which the government has to discover methods to control it and avoid resources depletion.
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recent evidence suggests that mars once had a global magnetic field. assuming this is true, which of the following could explain why mars today lacks a global magnetic field like that of earth?
The explanation why Mars today lacks a global magnetic field like that of the Earth is because Mars's interior has cooled so much that its molten core layer no longer undergoes convection.
Why does plаnet Mаrs hаs no mаgnetic field like the eаrth?The Eаrth's mаgnetic field is generаted by the motions of the liquid mаteriаl under the surfаce, pаrticulаrly the outer core. Mаrs, аs а much smаller body, cooled off fаster, аnd this convective motion ceаsed. The mаgnetic field died with it, except for weаk locаl pаtches thаt remаin to this dаy. However, it did hаve а mаgnetic field for а while, which helped retаin wаter аnd аtmosphere just аs it does on Eаrth todаy - something like the first billion yeаrs of its history. This is why it is considered one of the most likely plаces to hаve supported life in the distаnt pаst.
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White light strikes a prism on one side while individual colors of light travel out of the prism on its other side. This demonstrates that.
The demonstration shows that white light is made up of different colors. When the white light hits the prism, it is bent at different angles because the different colors are refracted at different angles.
This is why the different colors come out of the prism at different angles.This causes the different colors to spread out and appear on the other side of the prism.
The different colors come out of the prism at different angles because they are refracted at different angles. This is because each color has a different index of refraction. The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in a medium.
Each color has a different index of refraction because they each interact with the medium differently. This is why the different colors spread out and appear on the other side of the prism.
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Use the image of chlorophyll to answer the question.
How are carbon atoms represented in this image?
a.) white circles
b.) red circles
c.) blue circles
d.) dark grey circles
The carbon atoms in this image are shown as white circles. It has 55 carbon atoms coupled to 72 hydrogen atoms, 5 oxygen atoms, 1 magnesium atom, and differently substituted porphyrin rings with magnesium.
The phytol chain, a long carbon-hydrogen side chain, connects the ring to the porphyrin ring, a nitrogen-containing structure that surrounds the central magnesium atom in the chlorophyll molecule. Chlorophyll is the primary pigment used by plants to absorb light energy. A chlorophyll molecule has a porphyrin head and a long hydrocarbon tail.
Chlorophyll comes in four different varieties: chlorophyll a, which is present in all higher plants, algae, and cyanobacteria; chlorophyll b, which is present in higher plants and green algae; chlorophyll c, which is present in diatoms, dinoflagellates, and brown algae; and chlorophyll d, which is only present in red algae.
Thus, we might conclude that the white circles in this figure represent the carbon atoms.
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A bowling ball with a positive initial velocity slows down as it rolls down the lane toward the pins.
Is the bowling ball’s acceleration positive or negative as it rolls toward the pins? Explain
The bowling ball’s acceleration is positive as it rolls toward the pins.
What is bowling?
One of the most well-liked leisure activities in the world is bowling, sometimes referred to as "tenpins." To knock down ten pins, players roll a large ball down a lane. Many bowlers compete in amateur or professional bowling leagues, and it is regarded as both an individual and a team sport.
Although the ball is descending with a negative velocity, it is slowing down. hence, for the ball to slow down, the velocity must rise. Let the ball's initial speed, for illustration purposes, be -15 m/s. and it is reducing its speed to, say, -13 m/s. This indicates that its speed has increased by 2 m/s. Its acceleration is therefore positive.
Hence, the bowling ball acceleration is positive.
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2. As a shot putter in track, you want to throw as far as you can. You as the coach give your
best advice based on the Physics you learned. Give 2 suggestions to help your student and
explain why?
Answer:
Below
Explanation:
Throw it faster and closer to 45° to get the furthest horizontal distance
Brandon the child skater is propelled by a power rocket. Brandon and the rocket together have a mass of 25 kg. When
the thrusting force is 100 N and friction is 20 N. (a) what will be Brandon's acceleration? (b) How far will he go in 5 s if he
starts from rest?
The acceleration of the skater is 3.2 m/s^2 while the distance covered is 40 m
What is friction?The term friction has to do with the force that opposes motion. We know that the net force would be the difference between the thrust force and the frictional force since they act in opposite directions.
Now;
ma = 100 N - 20 N
The m is the mass of the object and the a is the acceleration of the skater.
25a = 100 N - 20 N
a = 100 N - 20 N/25
a = 3.2 m/s^2
Now;
s = ut + 1/2at^2
If u = 0 m/s (started from rest)
s = 1/2at^2
s = 0.5 * 3.2 * (5)^2
s = 40 m
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the sides of a yield sign all have the same length (see figure). the perimeter of a roadway yield sign is 219 centimeters. find the length of each side.
A roadway yield sign's exterior measurement is 219 centimeters. Consequently, the yield sign is 73 centimeters long on each side.
The perimeter of a given figure is equal to the total length of its sides.
Given that a yield sign's sides are uniform in length As a result, if the yield sign's perimeter is determined, it will be,
The yield sign's perimeter equals x + x + x.
Sphere = 3x
Therefore, if the circumference of a roadway yield sign is 219 centimeters, we can rewrite the circumference as,
Perimeter = 3x
219 centimeter = 3x
x = 219 centimeter / 3
x = 73 centimeter
Consequently, the yield sign is 73 centimeters long on each side.
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If light and sound travel from point A to point B and start at the same time, which will reach point B first? Responses A sound.sound. B light and sound at the same time.light and sound at the same time. C light in some situations, sound in others.light in some situations, sound in others. D light.
If light and sound travel from point A to point B and start at the same time, then Light will reach point B first as the speed of light is much greater than that of sound.
Light is an electromagnetic wave that can travel in a vacuum as well. It does not require any medium for transference. Light is a transverse wave, that is, the medium moves in the direction perpendicular to that the direction of propagation of the wave.
The speed of light in a vacuum is 3 × [tex]10^{8}[/tex] m/s
Sound is a longitudinal wave, and the direction of disturbance is parallel to the propagation of the wave. It cannot travel without a medium.
The speed of sound is maximum in air.
Speed of sound in air = 343 m/s
Thus, The speed of sound is greater than that of sound. So, the light will reach first.
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a spotlight on the ground shines on a wall m away. if a man m tall walks from the spotlight toward the building at a speed of , how fast is the length of his shadow on the building decreasing when he is m from the building?
The shadow is decreasing at the rate 0.9375 m/s if wall 12m away and man 2m and speed 2.5 m/s and shadow is 4m.
Let height of shadow= y,CD=x
Height of man=2 m
Speed of man= dx/dt=2.5m/s
ΔABD=ΔECD
therefore, AB/EC=BD/CD
y/2=12/x
xy=24
differentiate w.r.t t
xdx/dt+ydx/dt=0
xdy/dt=-ydx/dt
dy/dt = - y/x dx/dt
dy/dt=-3/8*2.5=-0.9375 m/s
length of shadow is decreasing at the rate of 0.9375 m /s
Therefore,
Speed is a term used to describe an object's magnitude of velocity. Kinematics typically examines speed. Dispatching, expedition, haste, and hurry are some frequent synonyms for speed. In spite of the fact that all of these words refer to "quickness in movement or action," the word "speed" suggests quick efficiency in movement or action. Additionally, some people use various forms of speed to suppress their appetite. Velocity, as opposed to speed, refers to the rate and direction of an object's movement as it moves along a path. Speed is defined as the rate at which a distance changes over time with a Velocity. It has a distance by time dimension. The basic unit of distance plus the basic unit of time are combined to form the SI unit of speed. The metric system uses meters per second as the unit of speed.
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When a pole vaulter reaches the top of her vault, how does her potential energy compare to her kinetic energy?.
Kinetic energy is twice the potential energy.
What type of energy is used in pole vaulting?A pole vaulter has kinetic energy when running forward. When a pole vaulter lowers the pole and jumps, it slows down and bends the pole. Their kinetic energy is transformed into polar elastic potential energy. When the pole is raised, the pole vaulter is lifted higher. After the start, the athlete and pole rotate around his starting box, converting some of the athlete's kinetic energy into gravitational potential energy. Also, during the jump, the momentum of the athlete causes the pole to flex, temporarily storing elastic stretch energy in the pole.
Mechanical energy depends on the position and motion of an object, and its force is the sum of kinetic energy (kinetic energy) and stored (potential) energy. That is, mechanical energy is produced when the potential energy of an object combines with its kinetic energy.
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Stuart is listing the changes to matter and energy that occur during the process of photosynthesis. Which of these examples should he include in his list?.
The energy that occur during the process of photosynthesis that changes to convert light energy into chemical energy stored in carbohydrates.
What is meant by photosynthesis?Photosynthesis occurs in plants that have chlorophyll and converts the solar energy absorbed into the chemical fuel required for energy generation.
Photosynthesis is primarily responsible for producing and sustaining the oxygen content of the Earth's atmosphere, as well as providing the majority of the energy required for life on Earth.
Plant leaves absorb sunlight and convert it into glucose and oxygen with the help of water and carbon dioxide.
Carbohydrates are broken down and undergo chemical changes in the presence of sun radiation, resulting in sustenance.
As a result, light energy is converted into chemical power during photosynthesis.
The plants convert the sunlight into glucose and oxygen with the help of water and carbon dioxide.
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A car moving with the initial velocity of 30 m/s slows down at a constant rate of -3 m/s2. What distance does the car cover over this time?
Distance does the car cover over this time is 150 meter.
What is velocity?When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.
Uniform motion an object is said to have uniform motion when object cover equal distance in equal interval of time within exact fixed direction. For a body in uniform motion, the magnitude of its velocity remains constant over time.
Given that car moving with the initial velocity of 30 m/s slows down at a constant rate of -3 m/s².
Using equation of motion
v² = u² +2as
s = -u²/2a
s = 30²/2.3
s = 150 meter
Distance does the car cover over this time is 150 meter.
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When the index card is quickly pulled away from the glass in a horizontal direction, why does the disk fall straight down into the glass?
a. kinetic friction
b. inertia
c. static friction
d. equilibrium
The disk falls straight down into the glass due to inertia. Therefore, option (B) is correct.
What is the Law of Inertia?The Law of inertia can be described as an object will continue to be in a state of rest or in motion unless an external force applies to it. All objects will come to rest and moving objects will continue to move in the absence of external power.
When the resistance is given by the body to continue to be in motion until an external force applies to it. Inertia s the reason the body to continue the motion in the same direction in the absence of external force. Inertia depends on density and mass, not on velocity.
When the index card is quickly pulled from the glass in a horizontal direction, the disk falls straight down into the glass as the disk tries to stay at rest due to inertia.
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A balloon rises at a rate of 4 meters per second from a point on the ground 50 meters.
50 metres away from the observer, a balloon begins to rise at a rate of 4 metres per second. When the balloon is 50 metres above the ground, determining how quickly the angle of elevation between the observer and the balloon changes.
Let h be the height of the balloon above the ground and represent the angle of elevation.
tanθ= h/50
provided that a balloon's height is 50 metres
tanθ =50/50
tanθ=1
θ=45o
tanθ= h/50
differentiating in light of time t
(1/50)dh/dt sec2 d/dt
Given that the balloon rises at a rate of 4 metres per second, we obtain 45o, therefore dh/dt = 4 m/s.
sec245o d=1/50*4 dt
2*dθ/dt= (1/50)*4
dθ/dt= (1/50)*4/2
dθ/dt= 1/25
0.04 rad/sec for d/dt.
When the balloon is 50 metres above the ground, the angle of elevation of the balloon is changing at a rate of 0.04 rad/sec from the observer.
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Which ituation with or without friction i more imilar to your everyday experience on a kateboard or bicycle?
Skateboarders move more quickly and more slowly depending on the gravitational field around them.
Skateboarders go more slowly and more quickly depending on the amount of friction they encounter. The skater initially has no kinetic energy, only potential energy. The skater had used all of the energy that she will ever have. Since the track is frictionless, no energy is converted to thermal energy throughout the route from point A to point B. The skater has greater potential energy the higher he is. His kinetic energy increases and his potential energy falls as his height decreases. Ice skating is a good illustration of sliding friction.
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How long has Pripyat been unoccupied?
The numbers of years that Pripyat been unoccupied is 36 years.
Why was Pripyat left behind?"The Chernobyl tragedy damaged the ecology irreparably, and the effects will continue for thousands of years." Due to excessive radiation levels, the area was evacuated, and Pripyat, a once-vibrant city of 50,000 people that included many nuclear plant workers, was left in ruins. Its urban landscape become covered with trees and vines over time.
Therefore, According to experts, the region won't be secure for at least 3,000 years; nevertheless, other people think this estimate is overly optimistic. A 2016 research states that it is anticipated that the reactor site won't be livable for at least 20,000 years.
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If 10mC of charge passes through a battery of 12 V, how much energy is transferred to the charge?
Energy is transferred to the charge is 120J
What is energy?
Energy is a general term that we use frequently in our daily lives. Although the term "energy" is frequently misused, it has a specific physical meaning. In physics, energy is defined as something's ability to accomplish work. Energy can take various forms. All energy is either kinetic or potential. Let us take a closer look at what energy is and the many sorts of energy in this post.
On Earth, there are various types of energy. On Earth, the sun is considered the elemental form of energy. Energy is a quantifiable property in physics that can be transferred from an item to perform work. As a result, we can define energy as the ability to perform any type of physical activity.
According to the laws of energy conservation, "energy cannot be generated or destroyed; it can only be transformed from one form to another." Joule is the SI unit of energy. One of the fundamental rules of physics is the law of energy conservation. It regulates the movements of individual atoms in a chemical process at the microscopic level. According to the rule of conservation of energy, "the entire energy of the system is conserved in a closed system, i.e., a system that is separated from its surroundings." Even when energy transformation happens, the overall energy in a system is conserved, according to the law. Energy can't be created or destroyed.
E = Q X V
E=10X12
E=120J
Therefore, energy is transferred to the charge is 120J
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