A force of friction on a box going down an incline is 3 lbs (N)
What is force of friction?Frictional force is the force created when two surfaces come into contact and slide against one another. The following variables impact the frictional force: Surface roughness and the amount of force pressing them together have the biggest an impact on these forces. friction, a force that prevents two solid objects from rolling or sliding over one another. Although frictional forces, such as the traction required to walk without slipping, can be advantageous, they also pose a significant amount of resistance to motion.
How do you find the force of friction and what are the forces of friction?The resistive force of friction (Fr) divided by normal or perpendicular force (N) pushing the objects together yields the coefficient of friction (fr), which is a numerical value. Equation fr = Fr/N serves as a representation of it.
The force that prevents one solid item from moving across another is known as friction. The four basic types of friction are fluid friction, rolling friction, sliding friction, and static friction.
Briefing:10 lbf = 44.4822161525 N
0.30 us = 0.30 KJ
Weight = 0.25
0.30us-10lbf=3lbs
1. Decide which natural force is present between the object and the earth. Consider a typical force of 0.10 lbf (N)
2. Establish the frictional factor. We can opt for a friction coefficient of 0.30us.
3. Multiplying these figures by one another: (0.10lbf(N)) x 0.30us = 3 pounds (N)
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1. A scientist wants to test the sleeping effects of a mild animal tranquilizer on two of his pet rats. He decides that he will put them in two cages of the same size and shape and place them in the same area of his lab for 24 hrs. He decides that he is going to turn the lights on at 5am and turn the lights of at 8pm each day. He feeds both rats lunch each day at noon and chops up 5mg of animal tranquilizer into their food. He notes that at about 5pm both rats fall asleep and wake up at about 5am the following day. He continues this procedure for 15 days and notes the same pattern each day. He concludes that his study shows that the animal tranquilizer will cause all animals to fall asleep at 5pm for a total of 12 hrs.
Did this experiment give accurate results? Why or why not?
Since both rats get the tranquilizer and there is no control condition, the experiment is not accurate.
An experiment is what?An experiment would be carried out by a scientist in search of data and knowledge. We are aware that in an experiment, the impact of the independent variable on the dependent variable must be determined.
In this instance, the dosage of the medication is the independent variable, and the duration of sleep time for the pet rats is the dependent variable.
Let's notice that a controlled setting is required for every experiment.
What would be used to validate the experiment as we now understand it is the control setting of the experiment?We can observe that this experiment lacks a controlled environment, proving that it is not reliable.
A control setting should be introduced, and this experiment would need to be evaluated.
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As you travel downhill, your vehicle needs less power to reach the bottom and your stopping _________ increases.
Answer: Distance
Explanation:
When driving, it is important for one to always use safety belt and obey traffic rules.
During a collision, it is vital to always adhere to safety belts and also use occupant protection systems in order to help reduce the impact that an be felt during a collision. As you travel downhill, your vehicle needs less power to reach the bottom and your stopping distance increase.
If professor X can move things with his mind.Then why cant he move his legs?
Answer: Varies
Explanation:
Because moving his legs require force.
Answer:
He is also a low-level telekinetic
Explanation:
He is a telepath and doesn’t have telekinesis btw.
PUBE: DATE: A particle is moving in a straight line with constant acceleration. it passes point p with speed of 2ms. ten seconds later passes point q. the distance between p and q is 40 metres. find the speed of particle as it passes point q.
Answer:4m/s
Explanation:The car is moving with constant acceleration therefore average speed is equal to distance over time to find the distance covered we multiple the speed by the time which gives 20 metres meaning after every 20 metres it uses a speed of 2m/s so for 40 metres it's going to be 40 x2 over 20 giving us 4m/s
Can you list out the signs (positive or negative) of objective and eyepiece of microscope (simple and compund) and telescope?
NO SPAM ❌❌
For compound microscope: the objective lens produces a real, inverted image that is then magnified by the eyepiece lens to produce an upright, virtual image.
For simple microscope: The objective lens produces a real, inverted image that is viewed directly by the eye without the need for an eyepiece lens.
For telescope: The objective lens or mirror produces a real, inverted image that is then magnified by the eyepiece lens to produce an upright, virtual image. The eyepiece can be positive or negative depending on the desired magnification.
What are objective and eyepieces?The following are some signs (positive or negative) of objective and eyepiece lenses in microscopes and telescopes:
Objective lens:
Positive sign (+): used for normal, upright specimens; brings light rays to a focus in front of the lensNegative sign (-): used for inverted specimens; brings light rays to a focus behind the lensEyepiece lens:
Positive sign (+): increases the magnification of the image and produces a larger virtual imageNegative sign (-): decreases the magnification of the image and produces a smaller virtual imageLearn more about objective and eyepiece here: https://brainly.com/question/14055649
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What did classical physics predict would happen to the light given off by an
object as its temperature increased?
A. The wavelength of the light would decrease from visible light into
the ultraviolet range.
B. The color of the light would fade to black as the brightness
decreased.
C. The color of the light would change to white, and the brightness
would decrease.
D. The wavelength of the light would decrease from visible light into
the infrared range.
Answer:
The Wavelength of the light would decrease from visible light into ultraviolet range A P E X
Explanation:
Classical physics predict that as the temperature is increased, the wavelength of the light would decrease from visible light into more energetic ultraviolet range.
What is classical physics?When an electric charge vibrates, an electromagnetic wave is produced. Remember that heat is simply the kinetic energy of random motion. In a hot object, electrons vibrate in random directions and produce light as a result.
A hotter object produces more energetic vibrations, and thus emits more light —- it glows brighter. So far, so good. However, classical physics was unable to explain the shape of the blackbody spectrum.
As per the classical physics concepts, as the temperature increases, the wavelength of light becomes shorter and shifts to higher energy regions. Therefore, option A is correct.
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the resistor of values 6 ohm,6 ohm are connected in series and 12 ohm are connected in parallel. the equivalent resistance of the circuit is
Answer:
The equivalent or total resistance of the circuit is 6
Explanation:
6 &6 are in series
6+6=r
r= 12
1/Rtotal= 1/12+1/2
1/Rt=2/12=1/6
Rt=6
In a laboratory experiment, you wish to determine the initial speed of a dart just after it leaves a dart gun. The dart, of mass m, is fired with the gun very close to a wooden block of mass M0 which hangs from a cord of length l and negligible mass, as shown above. Assume the size of the block is negligible compared to l, and the dart is moving horizontally when it hits the left side of the block at its center and becomes embedded in it. The block swings up to a maximum angle ?max from the vertical. Express your answers to the following in terms of m, M0, l, max, and g. Determine the speed v0 of the dart immediately before it strikes the block.
The speed v₀ of the dart immediately before it strikes the block can be determined using the principle of conservation of mechanical energy. The initial kinetic energy of the dart is equal to its final potential energy when it reaches its maximum angle of swing.
Using the principle of conservation of mechanical energy, we can write:
(1/2)mv₀² = (1/2)M₀gl(1 - cosθmax)
where m is the mass of the dart, M₀ is the mass of the wooden block, l is the length of the cord, θmax is the maximum angle of swing, and g is the acceleration due to gravity.
Simplifying the equation, we can solve for v₀:
v0 = √(2M₀gl(1 - cosθmax)/m)
Therefore, the speed v₀ of the dart immediately before it strikes the block is given by the above equation, where v₀ is the square root of 2 times the product of M₀, g, l, (1 - cosθmax), divided by m.
This equation takes into account the masses of the dart and the block, the length of the cord, the maximum angle of swing, and the acceleration due to gravity to determine the initial speed of the dart.
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As Courtney switches on the TV set to watch her favorite cartoon, the electron beam in the TV tube is steered across the screen by the field between two charged plates. If the electron experiences a force of 3.0 * 10^6 N, how large is the field between the deflection plates?
Answer:
Explanation:
Force= (q1q2)/(4/\Ęr2)
3×10^6= (1.602×10^-19)^2/(r^2)
r^2=(2.27×10^-33)/(3×10^6)
r^2=8.55×10^-45
r= 9.25×10^-23
Dados los vectores a ⃗=6m y b ⃗=8m encontrar su resultante cuando Forman ángulo recto de 90° Son paralelos de igual sentido Son paralelos de sentido contrario
Answer:
I will answer in English, and i will give some representation for each case:
We have a = 6m and b = 8m.
If they are perpendicular, we have that:
a = (6m, 0) b = (0, 8m)
The adition is:
a + b = (6m, 8m).
If they are parallel, we have;
a = (6m, 0)
b = (8m, 0)
a + b = (6m + 8m, 0) = (14m, 0 )
If they are parallel but opposite:
a = (6m, 0)
b = (-8m, 0)
a + b = (6m - 8m,0) = (-2m, 0)
What is the current flowing through a 120 volt toaster that has a resistance of 24 ohms?
The current flowing through the toaster is 5 amps, calculated using Ohm's law with a voltage of 120 V and resistance of 24 ohms.
To decide the ongoing coursing through the toaster oven, we can utilize Ohm's regulation, which expresses that the ongoing through a guide between two focuses is straightforwardly corresponding to the voltage across the two focuses and conversely relative to the opposition between them.
Numerically, this can be communicated as I = V/R, where I is the ongoing in amps, V is the voltage in volts, and R is the opposition in ohms.Connecting the qualities given in the inquiry, we get:
I = V/R = 120 V/24 ohms = 5 amps
Consequently, the ongoing coursing through the toaster oven is 5 amps. This implies that the toaster oven is consuming electrical power at a pace of 600 watts (P = IV), which is the result of the flow and voltage across it.
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In a ride in an amusement park, a carriage of mass 450 kg is travelling horizontally at a speed of 18 m/s. It passes through a shallow tank containing stationary water. The tank is of length 9.3 m. The carriage leaves the tank at a speed of 13 m/s. PT 3 a.) Calculate the change in kinetic energy of the cart while it passes through the water tank J (Hint: Change
Answer:
98.
Explanation:
divide
The change in the kinetic energy of the cart is equal to 34875 J.
What is kinetic energy?The energy which is possessed by a moving body because of its motion is known as kinetic energy. Work should be done in order to bring the change in the kinetic energy of a moving object.
The kinetic energy of a moving object can be determined from the formula mentioned below:
K.E. = ½mv² where ‘m’ and 'v' is the mass and velocity of the object.
Given, the mass of the carriage, m = 450 Kg
The speed of the carriage, u = 18 m/s
The initial kinetic energy of the cart = (1/2) × 450 × (18)²
(K.E.)₁ = 72900 J
The final speed of the cart, v = 13 m/s
The final kinetic energy of of the cart = (1/2) × 450 × (13)²
(K.E.)₂ = 38025 J
The change in the kinetic energy of the cart = (K.E.)₂ - (K.E.)₁
Change in the kinetic energy = 72900 - 38025 = 34875 J
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QUESTION 4
Which of the following is NOT an example of a longitudinal wave?
a. Primary earthquake waves
b. Sounds waves
c. Surface water waves
d. Internal water waves below the surface
Answer:
I think the answer might be the first one
The four vectors a1=[1,2,2],a2=[2,0,0],a3=[3,−3,0],a4=[1,1,1] span R3 (in other words, their span equals R3 ). Exactly one of the four vectors has the property that the span changes when you take it away. Which one? a1 a2 a3 a4
Vector a3 = [3, -3, 0] is the one that, when removed, causes a change in the span. To determine which vector causes a change in the span when removed, we can check if any of the vectors can be expressed as a linear combination of the remaining vectors.
Let's consider each vector one by one:
Vector\(a_1\)= [1, 2, 2]:
To check if a1 can be expressed as a linear combination of the remaining vectors, we solve the equation:
\(c_2 * a_2 + c_3 * a_3 + c_4 * a_4 = a_1\)
Solving this equation, we find that a1 cannot be expressed as a linear combination of \(a_2, a_3, and a_4.\)
Vector a_2 = [2, 0, 0]:
We check if \(a_2\)can be expressed as a linear combination of the remaining vectors:
\(c_1 * a_1 + c_3 * a_3 + c_4 * a_4 = a_2\)
Solving this equation, we find that \(a_2\) cannot be expressed as a linear combination of \(a_1, a_3,\) and \(a_4.\)
Vector \(a_3\) = [3, -3, 0]:
We check if a_3 can be expressed as a linear combination of the remaining vectors:
\(c_1 * a_1 + c_2 * a_2 + c_4 * a_4 = a_3\)
Solving this equation, we find that \(a_3\) can be expressed as a linear combination of a_1 and a_4:
\(3 * a_1 + (-3) * a_4 = a_3\)
Therefore, \(a_3\)can be expressed as a linear combination of the remaining vectors.
Vector a_4 = [1, 1, 1]:
We check if a4 can be expressed as a linear combination of the remaining vectors:
\(c_1 * a_1 + c_2 * a_2 + c_3 * a_3 = a_4\)
Solving this equation, we find that\(a_4\) cannot be expressed as a linear combination of\(a_1, a_2, and a_3.\)
Based on the above analysis, we can conclude that vector \(a_3\) = [3, -3, 0] is the one that, when removed, causes a change in the span.
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A 90.0 kg man climbs up
a rope. At the top, his
potential energy is
8352.54 J. How high
does the man climb up
the rope?
From the given data and calculations, we can see that the man has climbed 9.46 meters
Given DataMass of the Man =90.0 kg Potential Energy at the Top of the rope = 8352.54 JHeight Climbed = ??We know that the expression for Man's potential energy at the top of the rope can be expressed as
P.E = mgh
Let us take acceleration due to gravity to be
g = 9.81 m/s^2
Substituting our given data into the expression and solving for h we have
8352.54 = 90*9.81*h
8352.54 = 882.9h
Dividing both sides by 882.9 we have
h = 8352.54/882.9
h = 9.46 meters
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an object is subjected to an applied upward force of 10 lbf. the only other force acting on the object is the force of gravity. the acceleration of gravity is 32.2 ft/s2. if the object has a mass of 50 lb, determine the net acceleration of the object, in ft/s2. is the net acceleration upward or downward?
Net acceleration of an object refers to the total acceleration experienced by the object, taking into account all the forces acting on it.
It is the vector sum of all the individual accelerations caused by each force.
Net acceleration represents the rate of change of velocity of an object and determines the direction and magnitude of its motion.
If the net acceleration is upward, the object is accelerating upward, and if it is downward, the object is accelerating downward.
Net acceleration can be calculated using Newton's Second Law of Motion:
Force upward is 10 lbf
A = F/m = 10/50 = 0.2 m/s2 = 0.656 ft/s^2 of upward acceleration.
Downward acceleration = 32.2 feet per second.
Net acceleration is equal to g - a, which is 32.2 ft/s^2 - 0.656 ft/s2 = 31.544 ft/s^2.
Net downward acceleration is present.
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Which of the following can be determined from the location of a main-sequence star on the H-R diagram? (Select all that apply.) a. temperature b. luminosity c. radius d.…Which of the following can be determined from the location of a main-sequence star on the H-R diagram? (Select all that apply.)a. temperatureb. luminosityc. radiusd. mass
The figure can be used to determine the temperature, luminosity, radius, and mass of a main sequence star.
Mass; B.) Radius; D.) Luminosity; F.) Temperature
The H-R diagram: what is it?The relationship that exists between a star's luminosity and its temperature is depicted in the Hertzsprung-Russell diagram. The H-R diagram and the color-magnitude diagram are other names for it. Because it can be used to plot a star's life cycle, it is a very useful graph. It can be used to investigate groups of stars in galaxies or clusters.
What exactly is the H-R diagram and what is its significance?One of the most significant diagrams in astronomy is the Hertzsprung-Russell diagram, also known as the H-R diagram. This diagram shows the evolutionary course that a star will take, which is influenced by its mass.
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How are genotypes and phenotypes related 1 point?.
Despite being two distinct ideas, phenotype and genotype are tightly intertwined. The term "phenotype" describes the physical characteristics of an organism that result from the expression of a person's genes.
The phenotype of an individual is determined by genotype. While an organism's genotype refers to its genetic makeup, its phenotype describes how it looks on the outside. The visible manifestation of a person's genes is their phenotype. Therefore, even an organism belonging to the same species may vary due to a slight variation in their genotype. The primary distinction between the two is this.
Their genotype could be used to decipher the human genetic code. It chooses which features or qualities to display. Even organisms with the same genotype might have different appearances. Periodically, both behavior and appearance change. In contrast, even identical-looking species do not share the same genotype.
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a milling machine processes a part with t0=15 mins and sigma0=3mins. the mean time to failure 750 mins and the mean time to repair is 200 muns. the coefficient of varuation for the repair time is 1.2. the product of the milling machine is feeding the downstream turning machine. the turning maching had the same t0 and sigma0, but the mean time to failure and mean time to replair are 110 muns and 38 muns. (cv=1.2).Assuming the arrival to the milling machine is 1.2 parts/hrwith an arrival Cv =1. find the cycle time of the entire line.
The cycle time of the entire line is 30.00528 minutes per part.
To calculate the cycle time of the entire line, we need to consider the processing times, failures, and repairs of both the milling machine and the turning machine.
For the milling machine:
Mean processing time (t0) = 15 mins
Standard deviation of processing time (sigma0) = 3 mins
Mean time to failure (MTTF) = 750 mins
Mean time to repair (MTTR) = 200 mins
For the turning machine:
Mean processing time (t0) = 15 mins
Standard deviation of processing time (sigma0) = 3 mins
Mean time to failure (MTTF) = 110 mins
Mean time to repair (MTTR) = 38 mins
We also know that the arrival rate to the milling machine is 1.2 parts/hr, with a coefficient of variation (CV) of 1.
To calculate the cycle time, we can use the following formula:
Cycle time = Processing time + Failure time + Repair time
Processing time:
The processing time is the sum of the mean processing times of the milling machine and the turning machine:
Processing time = t0 (milling machine) + t0 (turning machine) = 15 mins + 15 mins = 30 mins
Failure time:
The failure time is the inverse of the MTTF, considering the arrival rate:
Failure time = 1 / (MTTF * Arrival rate) = 1 / (750 mins * (1.2 parts/60 mins)) = 0.00111 parts/min
Repair time:
The repair time is the inverse of the MTTR, considering the coefficient of variation (CV):
Repair time = 1 / (MTTR * CV) = 1 / (200 mins * 1.2) = 0.00417 parts/min
Cycle time:
Cycle time = Processing time + Failure time + Repair time = 30 mins + 0.00111 parts/min + 0.00417 parts/min
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A 50kg person standing still in ice skates throws their helmet to the right at 25 m/s while on a frictionless surface. This gives the person a speed of 1.0m/s leftwards. What is the mass of the helmet?
Consider rightward as the positive direction.
Answer:
2.0 kg
Explanation:
alright eksqijakojqnlqozjzbw.wlisj
Answer:
eksqijakojqnozjzbw.wlisjaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Explanation:
Which of the following is NOT a correct statement regarding the theory of evolution?
The offspring of a species compete with each other for limited resources.
All organisms in a species are genetically unique.
The offspring of a species with the most favorable traits have the best chance for survival.
All organisms evolve at the same rate.
the answer is "all organisms evolve at the same rate" :)
Answer:
answer is b
Explanation:
A hair dryer is rated at 1.2kW. When it is plugged into a standard outlet and turned on, what is the current in the hair dryer?
Answer:
1200 watts at a standard 120v draws 10 amps
A small, private airplane is carrying three passengers to an island. The plane is 0.9 km in
the air. If the potential energy of the plane and its three passengers is 48,510,000 J, what is
the combined mass of the plane and its passengers? Round your answer to the tenth place.
Convert the height in km to m.
Rearrange the formula to solve for mass.
Use the formula to solve for the mass of the plane and passengers.
The potential energy that a huge item has in relation to another massive object due to gravity is known as gravitational energy or gravitational potential energy.
The mass of the plane and passenger is 5494.4 kg
What is potential due to gravity?The energy that an item has or acquires when its location changes as a result of being in a gravitational field is known as gravitational potential energy. Gravitational potential energy can be defined as an energy that has a connection to gravitational force or gravity.The potential energy that a huge item has in relation to another massive object due to gravity is known as gravitational energy or gravitational potential energy. When two objects descend toward one another, the potential energy associated with the gravitational field is released (transformed into kinetic energy).following equation: Potential energy U=m g h
Where:
m = mass [kg]
g = gravity = 9.81[m/s^2]
h = elevation = 0.9 [km]
m= u/ (gh)
m = 48,510,000 / (9.81 x .9)
m= 5494.4 kg.
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The unit for work can be written as __________ or as the nickname ______
N or Joule
W or Joule
Nm or Joule
MN or joule
At 2:00 p. M. Two cars start toward each other from towns 240 miles apart. If the rate of one car is 10 mph faster than the other, how fast does each car go if they meet at 5:00 p. M. ? if 3x represents the distance that the slower car traveled, then which expression represents the distance the faster car traveled? 3 x + 10 3 x + 30 3(240).
135 miles represents the distance the faster car traveled.
Just what is distance?Distance is an object's overall movement, regardless of direction. Regardless of an object's starting or ending point, distance can be defined as the amount of ground it has travelled.
If we call the slower vehicle's speed S, the other vehicle's speed is S + 10 mph.
They've been on the road for three hours as of 5:00 p.m. The faster car travels 3(S+10) miles, while the slower one travels 3S miles.
However, the sum of the two distances has to be 240 miles, so 3S+3(S+10)=240,
3S+3S+30=240,
6S=210, and
S=35 mph.
The faster vehicle travels at 45 mph. We can see that 3S is equal to 3x, which means that x=S=35 mph and that the faster vehicle travels 3×45=135 miles.
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which refers to a transfer of thermal energy between two objects?
A. potential energy
B. kinetic energy
C. heat
D. temperature
Which is a characteristic of the electron Sea model for Metallic bonding
Answer:
In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.
Explanation:
Answer:
Electrons flow easily between metal nuclei :)
Explanation:
a continental polar (cp) air mass would tend to have which of the following characteristics?
A continental polar air mass is characterized by its cold, dry, and stable nature, typically resulting in clear skies and fair weather conditions. It has limited moisture content and originates from polar regions, far from the influence of warm oceanic air masses.
A continental polar (CP) air mass typically exhibits the following characteristics: Cold: CP air masses originate from polar regions, so they are generally cold in nature. They form over large landmasses, far from warm oceanic influences. Dry: Since CP air masses form over land, they have minimal moisture content. These air masses lack significant interaction with bodies of water, which limits their ability to pick up mois ture. Stable: CP air masses are often associated with high pressure systems, resulting in stable atmospheric conditions. The colder air is denser, which restricts vertical motion and limits the development of convective storms and precipitation. Clear skies: The stable nature of CP air masses inhibits the formation of clouds and promotes clear skies and generally fair weather conditions. Potential for temperature fluctuations: CP air masses can undergo significant temperature changes, especially when moving across contrasting geographic regions. This variability can lead to rapid temperature shifts and influence local weather patterns.
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define inertia.mention it's types
Answer:
It is the inability of the body to change by itself its state of rest or uniform motion or direction. Types of Inertia- It is of three types-(1)Inertia of rest (2) Inertia of motion(3) Inertia of direction. (1) Inertia of rest - It is the inability of the body to change by itself its state if rest.