The kinetic energy of a body whose mass is 150kg covering a total distance of 115km/hr is 76,512.27J.
How to calculate kinetic energy?Kinetic energy is the energy possessed by an object because of its motion, equal (nonrelativistically) to one half the mass of the body times the square of its speed.
Kinetic energy = ½ mv²
Where;
m = massK.E = kinetic energyv = velocityAccording to this question, a body of mass 150kg is covering a total distance of 115km/hr.
115km/hr = 31.94m/s
K.E = ½ × 150 × 31.94²
K.E = 76,512.27J
Therefore, 76,512.27J is the kinetic energy of the body.
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How long does it take for a short pulse of light to travel from one end of the glass to the other? A beam of light from a monochromatic laser shines into a piece of glass. The glass has thickness L and index of refraction n=1.5. The wavelength of the laser light in vacuum is L/10 and its frequency is f. In this problem, neither the constant c nor its numerical value should appear in any of your answers
Given that there are no obstacles in its path and it is free to move, we understand that the light in this situation moves at the speed of refraction index, which in this instance is n = 1.5. That period of time corresponds to the distance a brief pulse of light must travel to cross the glass from one end to the other.
How would you define refraction in plain English?In physics, refraction is the direction change brought on by a wave's speed change as it passes through one medium and enters another.
In what ways do reflection and refraction differ?When light strikes a material on a plane, it reflects, or returns. Light bends as a result of refraction, which is the process through which light's path changes when it passes through a substance. As a result, this is the primary distinction between the two. Usually, mirrors experience this effect.
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a material undergoes an isochoric process that is also adiabatic. is the internal energy of the material at the end of the process greater than, less than, or the same as it was at the start? justify your answer.
There is no heat transmission during an adiabatic process. In an adiabatic process, the link between work as well as the change in interior energy is known as work done.
What makes work what it is?Physics' definition of work makes clear how it is related to energy: anytime work is performed, energy is transferred. Work is the result of the portion of the force acting in the displacement's direction and its magnitude.
Calculation
In the case of an adiabatic process heat transfer is zero ( Q = 0 ), so internal energy is equal to the Work done.
According to the 1st law of Thermodynamics;
Q= ΔU + W
In an adiabatic process: Q= 0
So,
ΔU= -W
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an object is released from rest on a planet that has no atmosphere. the object falls freely for 3 m in the first second. what is the magnitude of the acceleration due to gravity on the planet? select all that apply
On the planet, the gravitational acceleration is 10.06 m/s2.
What separates gravitational force from gravity?The driving force between two bodies is gravity. However, gravity is the force that exists between a thing and the enormous object known as the earth. The force of gravity also shows that it is directly inversely proportional to the sum of the masses of the two objects.
What is gravitational force, for instance?The term gravitational pull refers to the force that the earth exerts on a body. Some examples of motion caused by gravitational force are the downward motion of water in a river, the downward motion of a ball thrown into the air, and the downward motion of the leaves and fruits of a tree as they fall to the earth.
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The magnitude of acceleration due to gravity on the planet is 3 m/s^2.
What is acceleration due to gravity?The acceleration of an object in free fall within a vacuum is known as gravitational acceleration.
This is the constant acceleration brought on solely by the gravitational pull.
The acceleration due to gravity on a planet can be determined using the equation:
a = dv/dt
where a is the acceleration, dv is the change in velocity (in this case, the final velocity is the velocity at the end of the first second, which is the velocity at the end of the 3 meters fall) and dt is the change in time (in this case, 1 second).
Given,
the object is falling freely, the acceleration is equal to the acceleration due to gravity.
The velocity at the end of the first second can be calculated by using the equation:
v = d/t
where v is velocity, d is distance and t is time.
Therefore, substituting in the given values:
v = d/t = 3m/1s = 3m/s
Now we can substitute it in the first equation,
a = dv/dt = 3m/s /1s = 3 m/s^2
The magnitude of acceleration due to gravity on the planet is 3 m/s^2.
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How many newtons of force are required to pull a basket of fruit 2.5 M in 180 seconds using a 10 W of power?
Answer:
Explanation:
In order to answer this question, we need to first calculate the amount of work required to pull the basket of fruit 2.5 M in 180 seconds. This can be done by multiplying the power (10 W) by the time (180 seconds):
Work = 10 W x 180 s = 1800 J
Now, we can calculate the force required to do this work in 180 seconds by dividing the work (1800 J) by the distance (2.5 M):
Force = 1800 J / 2.5 M = 720 N
Therefore, 720 Newtons of force are required to pull a basket of fruit 2.5 M in 180 seconds using a 10 W of power.
Mg^12 O^8
-write down the electron structure
-Draw the atom
-write the molecule formula of the compound and give its name!
Answer:
Writing Electron Configurations. When writing an electron configuration, first write the energy level (the period), then the subshell to be filled and the superscript, which is the number of electrons in that subshell. The total number of electrons is the atomic number, Z
what did you observe about the motion of objects during and after collisions? 2. based on the velocity change of each object, what did you infer about the direction of forces during a collision?
When two objects of different masses are subjected to a force of the same strength, the one with less mass will experience a higher change in velocity.
What occurs when two items hit each other?Each object pulls the other when two objects come into contact. Imagine using a bat to strike a softball. The ball is pushed away by the bat when it collides with it. The bat experiences force from the ball as well.
What happens when two moving objects slam into each other?Even if two colliding objects have masses that are very different from one another, they will nevertheless exert equal forces on one another. An object always experiences an impetus and a shift in momentum during a collision. The impulse that an object encounters during a collision is equal to its variation in speed.
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redshifts were used as supporting evidence for the big bang theory. which describes redshifts? check all that apply.
The Doppler red shift of light observed from faraway stars and galaxies gives evidence that the universe is expanding. This permits for Big Bang Theory, because after a bang occurs all of the matter moves away from the point of origin.
What is the evidence that supports the Big Bang theory?Two major scientific discoveries that support the Big Bang theory are Hubble's discovery in the 1920s of a relationship between a galaxy's distance from Earth and its speed and in 1960s the discovery of cosmic microwave background radiation.
Who uses redshift evidences?Redshift and blueshift are used by astronomers to work out how far an object is from Earth.
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a truck is driving over a scale at a weight station. when the front wheels drive over the scale, the scale reads 5800 n. when the rear wheels drive over the scale, it reads 6500 n. the distance between the front and rear wheels is 3.20 m determine the distance between the front wheels and the truck's center of gravity. group of answer choices 1.69 m 1.50 m 1.59 m 1.72 m
Over a scale at a weight station, a truck is moving. The scale reads 5800 n when the front displacement wheels cross it; 3.20 meters separate the front and rear wheels when the rear wheels cross the scale.
What does physics mean by displacement?
The term "displacement" refers to a shift in an object's position. It is a vector quantity with a magnitude and direction. It looks like an arrow that leads from the beginning position to the ending place.
What is referred to as displacement?
When an atom or group of atoms in a molecule are replaced by another atom, this is referred to as a displacement reaction. For instance, iron replaces copper in a copper sulphate solution when it is introduced.
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The illumination lights in an operating room use a converging mirror to focus an image of a bright lamp onto the surgical site. One such light has a mirror with a focal length of 15 cm. If the patient is 1.0m from the mirror, where should the lamp be placed relative to the mirror?
According to the question: The lamp should be placed 11 cm from the mirror.
What is mirror?Mirror is an object which reflects light in such a way that images of nearby objects are visible. It is a surface which can reflect light in an exact way. Mirrors are used for various purposes like for making up, for decorating a room, for security purposes, and also for various scientific experiments. Mirrors are usually made up of two pieces of glass which are either flat or curved with a reflective coating on one side.
This coating is usually made up of metal, such as silver, and is highly reflective. Mirrors can also be made up of other materials such as plastic and other metals. By reflecting light, mirrors can help to create illusions and also create an optical illusion.
This is because the distance between the mirror and the lamp should be equal to the sum of the focal length of the mirror (15 cm) and the distance between the patient and the mirror (1.0 m). Therefore, the distance between the mirror and the lamp should be 1.0 + 15/100 = 2.15 m.
Use the thin lens equation to solve this
(1/s)+(1/s prime)=(1/f)
You are looking for the s value, which is the lamps distance from the mirror. s prime is the distance to the patient, and f is 10 cm.
(1/s)+(1/1.1)= (1/0.1)
= 11.000001 cm
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Which of the following is the origin of almost all the large moons around the jovian planets? 1. A) 2. B) 3. C) 4. D) T 5. E)
Capture of small planetesimals is the origin of almost all the large moons around the jovian planets.
What is origin?Origin is the place of beginning or coming into being. It is the point from which something starts or is derived. Origin is often associated with the source from which something is derived, such as the origin of a river. It is also used to refer to a person's ancestry, background, or place of birth. Additionally, origin may refer to the cause of something, such as the origin of a disease.
The leading theory of the origin of almost all the large moons around the jovian planets is the capture of small planetesimals. This theory suggests that the large moons were formed by the gravitational capture of small planetesimals by the jovian planets. The planetesimals, which were probably debris left over from the formation of the solar system, became trapped by the gravitational pull of the jovian planet, and then coalesced over time to form larger moons. This theory is supported by the fact that the orbits of the moons around the jovian planets are not aligned with the planet's rotational axis, which suggests that the moons were not formed from the same material as the planet.
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T (capture) is the origin of almost all the large moons around the jovian planets.
What do you mean by Jovian Planet?A Jovian planet, also known as a gas giant, is a large planet that is primarily composed of gaseous elements, such as hydrogen and helium. These planets are typically much larger than rocky planets, like Earth, and are typically found farther away from their star. The four largest planets in our solar system, Jupiter, Saturn, Uranus, and Neptune, are considered Jovian planets.
The origin of almost all the large moons around the jovian planets is thought to be through a process called "capture." Capture occurs when a moon or other celestial body becomes gravitationally bound to a planet or other larger body after passing nearby. This process can occur as a result of the gravitational forces of the larger body pulling in the smaller body, or through a collision between the two bodies. This process is believed to be the origin of most of the large moons around Jupiter, Saturn, Uranus, and Neptune.
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what is the maximum displacement after one time constant has elapsed in terms of the initial amplitude,
The highest deviation of the item from equilibrium, measured either in the positive or negative x-direction, is called the oscillation's amplitude, or A.
When the velocity reaches zero, the maximum displacement happens. (Why? You have the option of thinking physically or mathematically.) Additionally, the derivative of the velocity with respect to time is the acceleration. x(t) equals A cos(t + a).
The highest deviation of the item from equilibrium, measured either in the positive or negative x-direction, is called the oscillation's amplitude, or A. Repetitive harmonic motion is simple. The length of time (period T) required for an object to complete one oscillation and return to its initial position
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The change in sea level due to tides are primarily the result of ?
1. earth's rotation and revolution around the sun
2. the moon's rotation
3. the earth's rotation and the moon's revolution
4.the earth's elliptical orbit
According to the question, The change in sea level due to tides which are primarily the result of the Earth's rotation and Moon's revolution.
What triggers a tide?Ocean waves called tides go great distances. They result from the earth's gravitational pull from the moon and, to a slightly lesser degree, the sun. A shore encounters a tide when the wave's highest point, or the topping, reaches it.
What are waves and tides?Tides are extremely long-period waves that travel across the water as a result of the moon's and the sun's gravitational pull. The rise and decline of the sea's surface on a regular basis is what tides, which originate in the ocean, appear as as they move toward the coastlines.
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A typical chest X-ray uses X-rays with an RBE of 0.85.
If the radiation dosage is 35 mrem, find the energy absorbed by a 72 -kgpatient, assuming one-quarter of the patient's body is exposed to the X-rays.
The energy absorbed by a 72 -kg patient, assuming one-quarter of the patient's body is exposed to the X-rays is found to be 7.38 x 10^-4 J.
What does radiation absorbed dosage mean?The amount of energy that is deposited in tissue as a result of exposure to ionising radiation is known as the absorbed dose and is measured in joules (J) per kilogramme (kg). The effective dose, which is a weighted average of the equivalent dosage to each organ depending on its radiosensitivity, can be used to quantify the population's risk of stochastic consequences owing to radiation exposure.
RBE = 0.85.
radiation dosage = 35 mrem = 35 x 10^-6 rem.
Absorbed dose => dose / RBE;
=> 35 x 10^-6/ 0.85
=> 4.1 x 10^-5 J/Kg
Mass => 1/4 x 72Kg => 18Kg
hence, absorbed dose => 4.1 x 10^-5 J/Kg x 18Kg
=> 7.38 x 10^-4 J
Explain what is radiation?Energy that emanates from a source and moves through space at the speed of light is referred to as radiation. In addition to having wave-like attributes, this energy is enclosed by an electric field and a magnetic field. Radiation might also be alluded to as "electromagnetic waves."
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a ball starts from rest and rolls down a hill with uniform acceleration, traveling 200 m during the second 5.0 s of its motion. how far did it roll during the first 5.0 s of motion?
An object moving at a constant pace travels 5 meters in the first second; thus, it travels 45 meters in the third second.
In simple terms, what can the acceleration mean?The measurement of such a change in the speed called acceleration. Acceleration frequently, though not always, denotes a shift in speed. A thing that moves in a circle at a constant speed has still been moving forward since the direction of the motion is changing.
Calculation
the object starts from rest i.e. initial velocity, u = 0
and have uniform acceleration.
S = 5m and t = 1s
According to the formula of distance,
S = ut + 1/2 at²
5 = 0×1 + 1/2 a×1²
5 = 1/2a
a = 10m/s²
again, t = 3s
now, v = u + at
v = 0 + 10×3
v= 30m/s
Now, 2aS = v²-u²
2aS = 30²-0
2×10×S = 900
S= 900/20 = 90/2
S = 45m
Thus, the distance traveled by the body in 3rd second is 45m .
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a satellite is currently orbiting earth in a circular orbit of radius r; its kinetic energy is k1. if the satellite is moved and enters a new circular orbit of radius 2r, what will be its kinetic energy?
The kinetic energy of the satellite when it has been moved and it enters a new circular orbit of radius 2r is K₁/2.
Centripetal force is equal to mass times velocity squared over radius (Fc = mv²/r). Gravity is equal to gravitational constant times the product of masses of two objects over distance squared (Fg = GMm/r²). The centripetal force on the satellite is provided by the gravitational pull by the earth, so Fc = Fg.
Kinetic energy, the energy acquired by a moving object, is equal to one half of a mass times velocity squared (K = mv²/2).
Fc = Fg gives the equation mv²/2 = GMm/2r. As you can see, the kinetic energy K of the satellite is inversely proportional to radius or distance r. Therefore, K decreases by a factor of 2 when r increases by a factor of 2, and K₁/2 = 2r.
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a small piece of plastic is given a net charge of 1.74 c. how many more protons than electrons does the piece of plastic now have? (e
The number of protons than electrons is 1.74 x 10^19.
What are protons?A subatomic particle is the proton. The proton has a positive charge, or +1e elementary charge. The mass of a proton is slightly less than that of a neutron.
The units kg, MeV/c, and u can be used to calculate proton mass (AMU).
The net charge of an object is equal to the number of protons minus the number of electrons.
If the net charge of the piece of plastic is 1.74 coulombs, that means that the number of protons is greater than the number of electrons by 1.74 coulombs.
To find the number of protons or electrons, you would need to know the elementary charge, which is the charge of a proton or electron, which is 1.60 x 10^-19 C.
Therefore, the number of protons - number of electrons = 1.74 C / 1.60 x 10^-19 C/proton = 1.74 x 10^19 protons - electrons.
So, the number of protons than electrons is 1.74 x 10^19.
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true/false. Work occurs when (2 points)an applied force results in movement of an object in the same direction as the applied forcean object is subjected to balanced forces resulting in movement of the objectthe energy present is the result of the force acting on the objectthe movement of the object was caused by a force and is in the opposite direction of the force
True. Work occurs when an applied force results in movement of an object in the same direction as the applied force.
What is force?Force is an external influence that changes the motion, direction, shape, or energy of an object. Force can be described as a push or a pull and typically has both magnitude and direction. Force is a vector quantity meaning it has both magnitude and direction. Examples of forces include gravity, friction, tension, and electromagnetic forces. Gravity is the force that pulls objects towards the center of the Earth.
This is because work is the amount of energy transferred from one object to another due to the application of a force. The energy present is the result of the force acting on the object and the movement of the object is caused by the force in the same direction as the force.
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An object that is in simple harmonic motion is restored to its equilibrium position due to a force that is proportional to which quantity?tensionvelocitydisplacementperiod
Answer:
F = - K X describes the restoring force for SHM
The restoring force is proportional to "displacement"
Ted likes to run long distances. He can run 20 \text{ km}20 km20, start text, space, k, m, end text in 959595 minutes. He wants to know how many kilometers (k)(k)(, k, )he will go if he runs at the same pace for 285285285 minutes. How far will Ted run in 285285285 minutes
The earth's radius is 6.37×106m; it rotates once every 24 hours.
a.)What is the earth's angular speed?
b.)Viewed from a point above the north pole, is the angular velocity positive or negative?
c.)What is the speed of a point on the equator?
d.)What is the speed of a point on the earth's surface located at 3/4 of the length of the arc between the equator and the pole, measured from equator? (Hint: what is the radius of the circle in which the point moves?)
The radius of the Earth is 6.37X106 m, the earth's angular speed is 7.27X10-5 radian/s, the angular velocity is positive, the speed of a point on the equator is 463 m/s and the speed of a point on the earth’s surface halfway between the equator and the pole is 231.5 m/s.
Given data as per the question,
Radius of the Earth is 6.37×106m
T is 24 hours= 24X3600 = 86400 seconds.
(A) Angular Speed,
ω= 2π /T
2X3.14/86400 = 7.27 X10-5 radian/s
(B) When viewed from the North Pole, Earth's angular speed rotates in an anticlockwise direction. Therefore, the angular velocity is positive.
(C) The speed (v) of a point on the equator is,
ν= r X ω = 6.37 X 106 X 7.27 X 10-5 = 463 m/s
(D) The speed of a point on the earth’s surface halfway between the equator and the pole is,
ν= r/2 X ω = 463 /2 = 231.5 m/s.
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give an example of something we think of as work in everyday circumstances that is not work in the scientific sense. is energy transferred or changed in form in your example? if so, explain how this is accomplished without doing work.
To raise my grade in mathematics, I am working diligently, although this is not research in the traditional sense. In this illustration, the person is expending mental energy to study arithmetic, but no practical labor
What energy has the greatest strength?Unquestionably, nuclear energy seems to have the largest nameplate capacity compared to any other source of energy.
What energizes you?According to biology, the food we consume gives our bodies energy. Carbohydrates, lipids, & proteins are the three fuel types from which this energy is derived. Your body metabolizes the food you consume and absorbs this into your blood so that your cells may use it as fuel.
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sound travels at 343m/s in the air. what distance from the student, in meters, is the lightning strike?
In order to determine the distance from the student that the lightning strike occurred, you would need additional information, such as the time it took for the sound of the strike to reach the student. Without that information, it is not possible to calculate the distance of the lightning strike.
This can be calculated by dividing the distance (speed of sound x time) by the speed of sound, which is 343m/s. Once the time is known, the distance can be calculated by multiplying the time by the speed of the sound. It is not possible to determine the distance from the student to the lightning strike.
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4. A box rests on a horizontal, frictionless surface. A girl pushes on the box with a force of 18 N to the right and a boy pushes on the box with a force of 12 N to the left.The box moves 4.0 m to the right. Find the work done by (a) the girl, (b) the boy, and (c) the net force
A box rests on a horizontal, frictionless surface. A girl pushes on the box with a force of 18 N to the right and a boy pushes on the box with a force of 12 N to the left. The box moves 4.0 m to the right. Find the work done by (a) the girl, (b) the boy, and (c) the net force.
Explanation:
Find the work done by (a) the girl, (b) the boy, and (c) the net force.
a-b=c
18 N - 12 N = Net Force 6
The answer to Net Force of 6 to the right
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if a force of 20 n is required to extend a spring 4 cm longer than its natural length, how much work is done to extend it that far?
The work needed to extend its far is 80.
What is Work?
When an object is moved over a distance by an external force, at least a portion of that force must be applied in the direction of the displacement.
This is known as work in physics. By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant.
The work W is equal to the force f times the distance d, or W = fd, to mathematically describe this idea. The work is W = fd cos if the force is applied at an angle of to the displacement.
Therefore, The work needed to extend its far is 80.
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A marble is launched at a speed of 9 m/s at an angle of 25° above the horizontal. If the experiment is done on a level floor, then how far away will the marble land if friction is neglected? SHOW WORK.
A. 1.58 m
B. 3.16 m
C. 6.33 m
D. 6.98 m
If a marble is launched at a speed of 9 m/s at an angle of 25° above the horizontal. If the experiment is done on a level floor, then The distance that the marble will land if friction is neglected is: C. 6.33 m.
How to find the distance the marble will land if friction is neglected?Given data:
Speed = 9m/s
Angle = 25°
Now let find the distance the marble will land if friction is neglected
Range = v² sin(25 × 2)/g
Range = (9 m/s)² × sin 50 / g
Range =(81 m/s² × 0.766044) / 9.8 m/s²
Range = 62.049564 m/s² / 9.8 m/s²
Range = 6.3315m
Range = 6.332 m (Approximately)
Therefore we can conclude that the correct option is C.
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a 300 kg mass is moving to the right at a velocity of 20 m/s. all of a sudden (for no explicable reason) the mass of the object triples. what happens to the velocity?
If mass of an object become three times of its initial mass then velocity of the object reduced and has value 11.547 m/s in order to conserve kinetic energy.
What is kinetic energy?Kinetic energy is a type of energy that is present in a particle or object in motion. When work, which includes the transfer of energy was done on an object by applying a net force, that object acquired kinetic energy.
Case 1 -
Mass of object (m1) = 300
velocity of object (v1) = 20 m/s
Kinetic energy = 1/2 m × v²
Kinetic energy = 1/2 × 300 × 20²
Kinetic energy = 60000 J
Case 2 -
Mass of object (m2) = 3 × 300
= 900 m/s
velocity of object (v2) = v2 m/s
Kinetic energy = 1/2 m × v²
60000 = 1/2 × 900 × v²
133.33 = v²
v = 11.547 m/s
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If the mass of an object is 2 kg, the gravitational field strength is 4 and the change in height is 2 m, what is the change in gravitational potential energy stored?
ΔGPE = mgΔh
Answer:
Therefore, the change in gravitational potential energy stored is 8 Joules (J).
what is the ideal banking angle (in degrees) for a gentle turn of 1.90 km radius on a highway with a 105 km/h speed limit (about 65 mi/h), assuming everyone travels at the limit?
The ideal banking angle for a gentle turn of 1.90 km radius on a highway with a 105 km/h speed limit (about 65 mi/h) should be around 2.62 degrees.
What is banking angle?
Banking angle is an angle of a banked turn or curve on a road, track, or other surface. It is the angle at which the inside edge of the curve is raised above the surface, allowing the vehicle to turn more safely.
Banking angle is important to ensure vehicles can maintain traction while turning, as it helps to reduce the effect of centrifugal force on the vehicle and its passengers. Banking angle is also used to reduce the effects of gravity, which can cause the vehicle to lose control in a turn. Banking angle can range from 0° for a flat surface to a maximum of 60° for high speed curves.
105 km/h = 29.2 m/s
1.90 km = 1900 m
Ideal banking angle is given by
tan θ = v²/rg
tan θ = (29.2)²/(1900)(9.8)
tan θ = 0.045792
θ = tan⁻¹( 0.045792)
θ = 2.62°
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You are pedaling forward on your bike. Which of the following would decrease your acceleration?
A.An increase in your speed
B.An increase in your mass
C.An increase in your applied force
D.A decrease in your mass
An increase in your mass would decrease your acceleration. Therefore, option (B) is correct.
What is acceleration?Acceleration is the rate of change of velocity, and it is calculated as the change in velocity divided by the change in time. It is directly proportional to the force applied and inversely proportional to the mass. According to Newton's second law of motion, the force applied to an object is equal to the mass of the object multiplied by its acceleration (F = ma).
Therefore, if the mass of an object increases, the force required to accelerate it also increases and the acceleration decreases. However, an increase in speed is not directly related to acceleration, if you are already at a steady state (constant velocity) an increase in speed won't affect acceleration. Also a decrease in mass will increase acceleration.
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in a coulomb force experiment, a student determines that the force between two equally charged spheres is 300 nn when the centers are separated by 20 mm. what is the:
The charge is equal to the Q= 1.3×10^-4 c. Electric charge is the property of matter that causes it to experience a force when subjected to an electromagnetic field.
A force is what?In science, "force" refers to a certain concept. At this point, describing a force as a push or a draw is quite acceptable. It's incorrect to say that a thing "has in it" or "contains" the force. A force is experienced by one thing from another. The concept of a force makes no distinction between living creatures and inanimate objects.
Coulomb's law is what kind of force?Coulomb's inverse-square law, also referred to as Coulomb's law, is an experimental scientific concept that calculates the force between two stationary electrically charged particles. The electric force that exists between two charged objects at rest is known by the terms electrostatic force and Coulomb force.
F = (k ×Q1× Q2)/r^2
F = 300 N
r = 20 m
k = 8.987× 10^8 Nm^2/c^2
given Q1 =Q2 = Q
300= (8.987× 10^8× 2Q)/400
Q= 1.3×10^-4 c
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