A disk of mass m = 0.120 kg is attached to a lightweight, taut string which keeps it in circular motion, as shown in the figure below. A puck of mass m on a table is attached to a string that passes through a small hole in the table at point O. A hand holds the string taut below the table and pulls down with a force vector F. The puck moves counterclockwise with velocity vector vi in a circle of radius ri centered on the hole.
The disk slides on a horizontal table with negligible friction at speed vi = 80.0 cm/s, and the radius of its circular path is ri = 40.0 cm. The string passes a small hole in the table and is initially held in place. The string is then slowly pulled downward a distance of 18.0 cm. How much work (in J) is done on the disk?
Answer: [tex]W=\frac{1}{2}m[(\frac{v_ir_i}{r_i-y})^2-v_i^2)]\approx.089 J[/tex]
Givens:
m = 0.12 kg
vi = 0.8 m/s
ri = 0.4 m
y = 0.18m
Explanation:[tex]\\[/tex]
Note that the final radius subtracted by the distance pulled
[tex]r_f = r_i-y[/tex]Since angular momentum is conserved
[tex]L_i=L_f[/tex]
[tex]mv_ir_i=mv_fr_f[/tex]
[tex]mv_ir_i=mv_f(r_i-y)[/tex]
[tex]v_f = \frac{mv_ir_i}{m(r_i-y)}[/tex]
[tex]v_f = \frac{v_ir_i}{r_i-y}[/tex]
Work is the change in Kinetic Energy
[tex]W=KE_f-KE_i[/tex]
[tex]W=\frac{1}{2}mv_f^2-\frac{1}{2}mv_i^2[/tex]
[tex]W=\frac{1}{2}m(v_f^2-v_i^2)[/tex]
[tex]W=\frac{1}{2}m[(\frac{v_ir_i}{r_i-y})^2-v_i^2)]\approx.089 J[/tex]
GOOD LUCK ON THE WEBASSIGN
The work done on the disk is approximately -0.018 J. The negative sign indicates that work is done on the disk, reducing its mechanical energy.
Given:
Mass of the disk (m) = 0.120 kg
The initial speed of the disk (vi) = 80.0 cm/s = 0.8 m/s
Initial radius of the disk's circular path (ri) = 40.0 cm = 0.4 m
The distance the string is pulled downward (d) = 18.0 cm = 0.18 m
Calculate the initial mechanical energy (Ei) of the disk:
Ei = KE + PE
Ei = (1/2) × m × vi² + m × g × ri
= (1/2) × 0.120 × (0.8)² + 0.120 × 9.8 × 0.4 = 0.08544 J
Ef = KE + PE
Ef = (1/2) × m × vf² + m × g × rf
= (1/2) × 0.120 × (0)² + 0.120 × 9.8 × (0.4 + 0.18) = 0.06744 J
W = Ef - Ei
= 0.06744 J - 0.08544 J
= -0.018 J
Therefore, the work done on the disk is approximately -0.018 J. The negative sign indicates that work is done on the disk, reducing its mechanical energy.
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what total force will cause an object with a mass of 10kg to gain 5 meters per second every second?
The total force required to cause an object with a mass of 10 kg to gain 5 meters per second every second is 50 newtons. To calculate the force required to cause this acceleration, we simply applied Newton's second law of motion here.
The force required to cause an object with a mass of 10 kg to accelerate at a rate of 5 meters per second every second can be calculated using Newton's second law of motion, which states that the force F required to accelerate an object of mass m at a rate of a is given by:
F = m * a
In this case, the acceleration a is 5 meters per second every second. Substituting m = 10 kg and a = 5 meters per second every second into the above equation, we get:
F = 10 kg * 5 meters per second every second
= 50 newtons
Therefore, the total force required to cause an object with a mass of 10 kg to gain 5 meters per second every second is 50 newtons.
The force required to cause an object to accelerate depends on its mass and the rate of acceleration. The mass of an object is a measure of its resistance to changes in motion, while the rate of acceleration is a measure of how much the object's velocity changes per unit of time. Newton's second law of motion, which relates force, mass, and acceleration, is one of the fundamental laws of physics and is used to understand and predict the motion of objects under the influence of forces.
In this case, we were given the mass of the object, which is 10 kg, and the rate of acceleration, which is 5 meters per second every second. To calculate the force required to cause this acceleration, we simply applied Newton's second law of motion, which states that the force required to accelerate an object is equal to the product of its mass and acceleration.
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The Supreme Court decision in Marbury v. Madison established which of these?
Answer:
The Supreme Court decision in Marbury v. Madison established the principle of judicial review. This means that the Supreme Court has the power to declare laws or actions of the executive and legislative branches unconstitutional if they violate the Constitution. The decision was made in 1803 and is considered a landmark case in American law and politics. It established the idea that the judiciary is a coequal branch of government and has the responsibility to interpret the Constitution and ensure that the other branches of government do not exceed their constitutional authority.
Explanation:
How to find the length of an array in PHP?
To find the length of an array in PHP, you can use the count() function.
The count() function returns the number of elements in an array.
Here's an example:
$myArray = array("apple", "banana", "orange", "grape");
$length = count($myArray);
echo "The length of the array is " . $length;
In this example, we first define an array called $myArray with four elements. Then we use the count() function to find the length of the array and assign the result to a variable called $length. Finally, we use the echo statement to display the length of the array.
The output of this code will be:
The length of the array is 4
Note that the count() function can also be used to find the number of elements in an object or a variable with a countable value.
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how many oz in a 2 liter
A preferred 2-liter bottle contains 67.6 fluid ounces. of liquid. Assuming which you're using 8-ounce cups, you could have 8.45 glasses of a few issue liquid is inside the 2-liter bottle.
An ounce is a unit of measurement commonly used for weighing small amounts of mass or weight. It is equivalent to 28.35 grams or 1/16th of a pound. Ounces are commonly used to weigh food items, such as fruits, vegetables, and meats, as well as precious metals like gold and silver.
In the United States, ounces are also used to measure liquid volume, with one fluid ounce equaling approximately 30 milliliters. Ounces are divided into different types, including avoirdupois ounces and troy ounces. Avoirdupois ounces are used to measure most common items, while troy ounces are primarily used for precious metals like gold and silver.
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Complete question: -
How many oz does a 2 liter bottle hold?
what is the origin and meaning of the word thermodynamics?
The word "thermodynamics" is derived from two Greek words "therme" meaning heat and "dynamic" meaning power. The word thermodynamics was first used in the late 19th century.
Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy, such as work, mechanical, chemical, and electrical energy. The term thermodynamics was first used in the scientific literature by Scottish physicist James Clerk Maxwell in 1871.
The concept of thermodynamics is based on the principle that energy cannot be created or destroyed, only transformed from one form to another. It also deals with the study of energy transfer, the laws of thermodynamics, and how these laws relate to the behavior of physical systems. This field has a wide range of applications, including the design of heat engines, the study of phase transitions, and the understanding of thermal and thermochemical processes.
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a 1.1 kw-hr dryer is used for .5 hours every day. what would georgia power charge for 30 days if their going rate is 11 cents/kw-hr ?
Answer:
21
Explanation:
The Georgia power charge for 30 days when their going rate is 11 cents/kw-hr every day will be 108.9 watts.
Electric power is the rate at which electrical energy is transferred from an electric circuit. The SI unit of power is expressed in the watt, one watt is equal to one joule per second.
The amount of power rate for one minute = 1.1 × 11/100 = 1.1 × 0.11 = 0.121 watts
The amount of power rate for 30 minutes = 0.121 × 30 = 3.63 watts
The power rate for 30 days(a month) will be = 3.63 × 30 = 108.9 watts
Therefore, the power charge for 30 days (one month) is 108.9 watts.
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What event will produce the greatest increase in the gravitational force between the two masses?.
The gravitational force between two masses depends on their masses and the distance between them.
What is gravitational force ?The gravitational pull between two masses is determined by their respective masses and their separation from one another. The biggest increase in gravitational force will result from moving the two masses closer together if the masses don't change. Therefore, a gravitational collapse or collision that brings the two masses together will result in the largest increase in the gravitational force between them.To know more about gravitational force , check out :
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An object is accelerated by a force of 100N. suddenly a second force of 100 N in the opposite direction is exerted on the object, so that the forces cancel. Why is it that the object will continue with same velocity it had before the second forces was applid?
Because according Newton's second law, When a second force of 100N is applied to the object, the net force is
Total F = 100N-100N, it's zero.
Therefore, the two forces cancel each other out and the net force is zero. Acceleration is also zero.
a = 0
About Newton's second lawNewton's Second Law tells us that an object can experience a change in speed due to a force. Reporting from the NASA Glenn Research Center, Newton's second law defines force equal to the change in momentum (mass times velocity) per change in time.
The change in momentum produces an external force and causes an acceleration on the object. Not only causing an external force, the change in momentum also sometimes results in a change in direction. Remember momentum and acceleration are vector quantities.
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A block of wood is floating with one half of its volume out of the water. Then it is pushed down so that it is completely underneath the water. Use your understanding of buoyant force and Archimedes' principle to determine what happens to the forces on the block of wood.
A. The buoyant force on the block is the same in the two cases because the weight per unit volume of the wood has not changed.
B. The buoyant force on the block is the same in the two cases because the weight per unit volume of the water is the same in each case.
C. The buoyant force on the block is greater when the block is completely submerged than it is when the block is floating.
D. The buoyant force on the block is greater when it is floating than when it is totally submerged.
E. The buoyant force on the block is the same in the two cases because the block loses weight as it is submerged.
In comparison to floating, the block experiences a stronger buoyant force when it is entirely submerged.
The correct option is C.
How does buoyant force work?The buoyant force, which exerts upward pressure on completely or partially submerged objects, operates both ways. Its thrust upward is also known as an upthrust. The buoyant force on a body that is partially or entirely submerged in a fluid creates the impression that it is losing weight or becoming lighter.
What is Archimedes' guiding principle?A body submerged in a liquid, whether partially or entirely, will experience buoyant force, which is equal to the weight of the liquid the body displaces and acts upward at the centre of the fluid's mass.
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A skateboarder on a ramp is accelerated by a nonzero net force. For each of the following statements, state whether it is always true, never true, or sometimes true.
Sometimes true.
For example, if a skateboarder is going down a ramp, the motion will be in the same direction as the net force. Conversely, when a skateboarder climbs a ramp, the direction of motion is opposite to the direction of net force. In general, there is no reason why the direction of motion should be in the same direction as the net force.
About net forceThe net force is defined as the sum of all the forces acting on an object.
Example,When you kick the ball, the ball takes off and moves through the air. At that time, there is a net force acting on the ball. When the ball begins to return to the ground and finally comes to rest, there is a net force acting on the ball as well.
Newton's Second Law says that "when a net force acts on an object, then the object must accelerate, that is, its velocity changes from second to second." By kicking the soccer ball for the first time, he speeds up, and when the soccer ball starts to slow down to a stop, he speeds up too.
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which of the following is the best example of Lawrence Kohlberg postconventional mortality
The best example is Preconventional Morality. The correct option is C.
What is Preconventional Morality?Preconventional morality is the first level of moral development in Lawrence Kohlberg's theory of moral development.
At this stage, individuals make decisions based on a desire to avoid punishment or gain rewards. They follow rules only to avoid punishment, and they have a self-centred view of the world.
According to my research on Lawrence Kohlberg's level of morality, I can say that the level being described is called Preconventional Morality based on the information provided within the question.
This is the first and second level of morality according to Kohlberg, and it focuses on obedience/reward, punishment, and self-interest. As stated in the question.
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The complete question is given below.
At which of Lawrence Kohlberg's levels of morality do people follow unvarying rules based on rewards and punishment?
a. Preconventional
b. Conventional
c.. Postconventional
d. Unconventional
what are electrical connectors
Answer:
CONNECTORS THAT BE ELECTRICAL AND CONNECT
Explanation:
IF YOU KNOW YOU KNOW HOW IT BE AND HOW IT IS AND WHY IT BE AND WHY IT IS
A 25.0 kg box of textbooks rests on a loading ramp that makes an angle α with the horizontal. The coefficient of kinetic friction is 0.250, and the coefficient of static friction is 0.350.
A) As α is increased, find the minimum angle at which the box starts to slip.
B）As this angle, find the acceleration once the box has begun to move
c) at this angle, how fast will the box be moving after it has slid a distance 4.7m along the loading ramp
(a) As σ is increased, The minimum angle will be "19.2°".
(b) The acceleration will be "0.91 m/s²"once the box has began to move.
(c) The speed will be "3 m/s" as the box slid a distance 4.7 m along the loading map.
According to the question,
Mass = 25.0 kg
Kinetic friction = 0.25
Coefficient of static friction = 0.35
(a) We know,
⇒ static friction = mg sine
⇒ mg cosine * u = mg sine
then,
tan A = u = 0.35
a = 19.2
Therefore, as α is increased, the minimum angle at which the box starts to slip is 19.2°.
(b) We know that:
Kinetic friction = mgCos19.2 * 0.25
= 2.31m
and,
Net force downwards = mgSin19.2 - mgCos19.2* 0.25
By substituting the values, we get
= m(3.22-2.31)
= 0.91m/s²
Therefore, As this angle, the acceleration once the box has begun to move at 0.91 m/s².
(c) since the box is sliding at a distance of 4.7 meter:
Thus,
The speed will be:
→ [tex]v^{2} - u^{2} + 2as[/tex]
[tex]0 + 2* 0.91* 5[/tex]
= 9.21
[tex]v = 3m/s[/tex]
Therefore, at this angle, at 3m/s will the box be moving after it has slid a distance 4.7m along the loading ramp
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urn on Path. Dots will now trail your skater in the style of a motion diagram. Equal time intervals exist between each new dot’s creation.
When are the dots furthest apart along the path? What does this indicate?
The dots are furthest apart along the path when the speed of the skater is the greatest.
This is because the dots represent the position of the skater at equal time intervals, and when the skater is moving faster, the position change between each dot will be greater, resulting in the dots being further apart.This indicates that the skater is experiencing a period of acceleration. The dots being further apart means that the position change of the skater over a given period of time is greater, which can only happen if the skater is experiencing a change in velocity, i.e., acceleration.Conversely, when the dots are closer together, it indicates that the skater is moving slower and experiencing little to no acceleration. Therefore, by analyzing the dots' spacing, one can infer the skater's motion's acceleration and deceleration phases.To know more about speed visit:
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Who described the universe as a giant clock with unified rules for gravitation and motion?
Write one word that means the time taken for a single vibration
Answer: d1ldo
Explanation:
the dependence of the rate constant on temperature is expressed by which equation?
The dependence of the rate constant on temperature is expressed by arrhenius equation.
The Arrhenius equation can quantitatively explain the temperature dependency of the rate of a chemical process.
[tex]k= Ae^{-Ea/RT}[/tex]
where, k is the rate constant, and T denotes the temperature. A represents the Arrhenius factor, also known as the frequency factor or pre-exponential factor. Ea is the activation energy in joules/mole, and R is the gas constant.
The ratio [tex]e^{-Ea/RT}[/tex] represents the proportion of molecules with kinetic energy greater than Ea. The Arrhenius equation has revealed that a rise in temperature or a fall in activation energy leads to an increase in reaction rate and an exponential rise in rate constant.
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When you increase the driving frequency of a wave on the string, does the wavelength decrease, increase, or stay the same? Select one: Increase Decrease Stay the same
When you increase the driving frequency of a wave on the string, the wavelength will decrease.
When you increase the driving frequency of a wave on a string, the wavelength of the wave will decrease. This is because the speed of the wave on the string is constant, so as the frequency increases, the wave must travel a shorter distance in one period. The wavelength is the distance between two consecutive points on the wave that are in phase (i.e. have the same displacement and velocity), so as the wave must travel a shorter distance in one period, the distance between two consecutive points on the wave that are in phase (i.e. the wavelength) will decrease.
Therefore, the correct answer is: Decrease.
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the change of potential due to electrotonic spread will get larger the further away from the starting point it travels.a. true b. false
True - the change of potential due to electrotonic spread will get larger the further away from the starting point it travels.
Electrotonic spread is the process by which electrical signals are transmitted through a neuron. When a neuron is stimulated, an electrical charge is created and propagated along the neuron's axon.
This charge causes a change in the potential difference or voltage across the neuron's membrane, known as a local potential.
As the charge moves away from the starting point, the change in potential due to electrotonic spread increases.
This is because the charge dissipates as it moves away from the starting point, resulting in a larger voltage change.
The further away from the starting point the charge travels, the larger the change of potential due to electrotonic spread.
This process is essential for the transmission of electrical signals in the nervous system and allows neurons to communicate with each other.
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What is meant by positive work, negative work, and zero work? Illustrate your answer with an example?
When the force and displacement are both in the same direction, positive work is produced. When the force and displacement are in opposing directions, negative work is done. When the force and displacement are perpendicular to one other, zero work is done.
When positive work is performed, the amount of energy transmitted to the object rises, and the work is said to be positive. For example, when a person lifts a box off the ground, the force applied is upward, as is the displacement of the box. As a result of the individual donating energy to the box, constructive work is done on it.
When negative work is performed, the energy transmitted to the object decreases, and the work is referred to be negative. When a person lowers a box to the ground, for example, the force applied is downward, whereas the displacement of the box is upward. As a result of the individual drawing energy away from the box, negative work is done on it.
There is no energy transfer in the case of zero work done, and the work is said to be zero. When a person moves a box over a level surface, for example, the force applied is forward, whereas the displacement of the box is horizontal. As a result, there is no work done on the box.
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SOMEONE PLS HELP!!! THIS IS HARD!!! I will make brainliest and this is in science!
Answer: It has the skill to nest
sorry if I'm wrong
Answer:
B: A colorful beak
Explanation:
i hope this helped!
Electromagnetic radiation consists of particles called _________, each of which has a discrete amount, or quantum, of energy. However, since electromagnetic radiation also has wave properties, each particle is also characterized by a specific (usually expressed in nm) and frequency __________ (expressed in s-1).
The photons that make up electromagnetic radiation each have a distinct quantity of energy known as a quantum.
What is the name of the electromagnetic radiation subatomic particles, each of which has a specific quantity of energy termed a?An electromagnetic wave makes up a photon, a small particle. They are both massless and chargeless. They can be compared to a small packet pure light energy. A quantum, or discrete packet comprising energy or matter, is an example.
Which of these devices measures the electromagnetic wave frequency?wavemeter: a tool for measuring the separation between subsequent wavefronts of an electromagnetic wave that are in phase. By measuring the wave's frequency, the decision is frequently made indirectly.
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What 3 conditions are necessary for a lunar or solar eclipse?
The three conditions necessary for a lunar or solar eclipse are as follows:
The alignment of the Sun, Earth, and Moon must be approximately in a straight line.Specific geometry: The alignment must occur at specific points in the Moon's orbit around the Earth. The apparent size of the Moon must be close to the apparent size of the Sun as seen from Earth.When one celestial body partially or entirely blocks out the light from another celestial body, the occurrence is known as an eclipse. Solar eclipses and lunar eclipses are the two primary categories of eclipses.
For a lunar eclipse, the Earth is positioned between the Sun and the Moon and the Moon must be on the other side of the Earth from the Sun during a full moon for the alignment to take place. For a solar eclipse, the Moon is positioned between the Sun and the Earth and the Moon must be between the Earth and the Sun during a new moon for the alignment to take place.
Therefore, The three conditions necessary for a lunar or solar eclipse are as follows:
The alignment of the Sun, Earth, and Moon must be approximately in a straight line.Specific geometry: The alignment must occur at specific points in the Moon's orbit around the Earth. The apparent size of the Moon must be close to the apparent size of the Sun as seen from Earth.To know more about eclipses, click here:
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An elevator suspended by a cable is descending at constant velocity. How many force vectors would be shown on a free-body diagram? Name them
When the elevator is descending at a constant speed, there are two forces at work on it. Both the weight of the elevator and the cable's tension are forces.
When the speed of a cable-supported elevator that is being suspended in the air is constant?A cable-hung elevator will experience zero change in velocity if it is descending at a steady speed. The net acceleration is therefore zero. The tension force (T) applied by the cable to the elevator is pulling it upward.
An elevator that is going downhill uses what kind of energy?The mechanical labour that moves the elevator up and down uses potential in the case of the elevator sinking. Note: The entire mechanical energy comprises a system in consideration is the sum of kinetic energy and potential energy.
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A boeing-737 airliner has a mass of 20 300 kg. The total area of the wings is 105 m2. What must be the pressure difference between the top and bottom of the wings to keep the airplane up?.
The correct option is A = 1897 N/m²
Given that,
Mass m= 20,300 kg.
Area A =105 m²
Pressure different between top and bottom
Assume the plane has reached a cruising altitude and is not changing elevation. The sum of the forces in the vertical direction is given as
∑Fy = Wp + FL = 0
where
Wp = is the weight of the plane, and
FL is the lift pushing up on the plane.
Let's solve for FL since the mass of the plane is given:
Wp + FL = 0
FL = -Wp
FL = -mg
FL = -20,300× -9.81
FL = 199,143N
FL should be positive since it is opposing the weight of the plane.
Let's Equate FL to the pressure differential multiplied by the area of the wings:
FL = (Pb −Pt)⋅A
where Pb and Pt are the static pressures on the bottom and top of the wings, respectively
FL = ∆P • A
∆P = FL/A
∆P = 199,143 / 105
∆P = 1896.6 N/m²
∆P ≈ 1897 N/m²
Hence 1897 N/m² is the correct answer.
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What temperature is 17 degrees in Fahrenheit?
Answer:
62.6 degrees fahrenheit
A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10 s?.
Answer:
100 m
Explanation:
Δx = v₀t + 1/2at²
Δx = 0 + 1/2(2 m/s²)(10 s)² = 100 m
An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of 6.8 m/s and measures a time of 18.8 s before the rock returns to his hand. Determine the acceleration due to gravity on this planet.
An object placed at a greater altitude will experience a reduced acceleration caused by gravity compared to an item located at a lower altitude because the value of g drops as the object's distance from the planet's core increases.
What is the acceleration due to gravity ?The radius and mass of the planet, as well as the separation between the item and the planet's centre, all affect the value of g.
Several aspects of physics, such as the motion of objects in free fall, the determination of escape velocity, and the examination of planets' and other celestial bodies' orbits, depend heavily on the acceleration caused by gravity.
The acceleration due to gravity on this planet can be determined by using the equation:
a = (2*v)/t,
where a is the acceleration, v is the initial velocity, and t is the time.
Substituting in the values given, we get:
a = (2*6.8)/18.8 = 0.7 m/[tex]s^{2}[/tex]
This is the gravitational acceleration on this planet. This equation defines the acceleration of a straight-line travelling object under the effect of gravity, hence it may be used to calculate the acceleration due to gravity on this planet.
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A large spring requires a force of 100 n to compress it only 0. 010 m. What is the spring constant of the spring?.
The spring constant of the spring is 10,000 N/m.
What is the constant ?The constant is a fixed value that does not change in response to external influences. It is often used in mathematics to represent a number that remains constant despite changes in the context or situation. In physics, constants are used to represent physical properties of matter, such as the speed of light or the force of gravity. In computing, constants are used to represent values that need to be used multiple times within a program. Constants can be used to improve code readability and maintainability, as well as to prevent errors associated with using the same value multiple times.
The spring constant, k, is a measure of how stiff the spring is; it is equal to the ratio of the force applied to the spring divided by the amount of displacement (or compression) of the spring. Therefore, the spring constant of the spring can be calculated as:
k = F/x
= 100 N/0.010 m
= 10,000 N/m
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