what dissolves in water burns in flames and a chemical property

The centripetal force exerted on a 22.0 kg child riding a playground merry-go-round rotating at 40.0 rev/min, to remain at a constant distance of 1.97 m from the merry-go-round's center is 502.82 N.

Centripetal force is the force required to maintain an object in a circular motion with a constant speed. Its direction is towards the center of the circle in which the object is moving.

The formula for calculating the centripetal force is given as: Fc = mv2/r where,

Fc is the centripetal force, m is the mass of the object,

v is the velocity of the object,

r is the radius of the circle.

Substituting the given values,

Mass of the child, m = 22.0 kg

Velocity, v = 40.0 rev/min,

we know 1 rev = 2π rad2π rad/1 rev so 40.0 rev/min = 40.0 * 2π rad/min = 80π rad/min

Radius, r = 1.97 m

Now, converting the velocity units from radians per minute to meters per second,1 rad/min = (1/60) rad/s

Therefore, 80π rad/min = 80π/60 rad/s = (4/3)π rad/s

Velocity, v = rω where, ω is the angular velocity.

Substituting the given values,ω = v/rω = (4/3)π rad/s / 1.97 mω = 2.012 rad/s

Substituting the given values in the formula for centripetal force, we get

Fc = mv2/rFc = 22.0 kg × (2.012 m/s)2 / 1.97 mFc = 502.82 N

Thus, the centripetal force exerted on the child is 502.82 N.

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The person's final displacement is approximately 227 meters at an angle of 17.9 degrees North of West.

The first displacement of 20 m [N 20° E] can be broken down as follows,

The x-component is 20 cos(20°) = 18.8 m to the East

The y-component is 20 sin(20°) = 6.8 m to the North

The second displacement of 120 m [N 50° W],

The x-component is 120 cos(50°) = -91.9 m to the West

The y-component is 120 sin(50°) = 92.2 m to the North

The third displacement of 150 m [W] has no y-component, and the x-component is simply -150 m to the West.

The fourth displacement of 30 m [S 75° E],

The x-component is 30 cos(75°) = 7.4 m to the East

The y-component is 30 sin(75°) = -28.6 m to the South

The total x-component is 18.8 m - 91.9 m - 150 m + 7.4 m = -215.7 m to the West. The total y-component is 6.8 m + 92.2 m + 0 m - 28.6 m = 70.4 m to the North

To find the magnitude of the resultant vector,

|d| = sqrt((-215.7 m)^2 + (70.4 m)^2) ≈ 227 m

To find the direction of the resultant vector,

θ = tan^-1(70.4 m / 215.7 m) ≈ 17.9° N of W

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Answer:

1- How to Calculate Power?
ans; power is defined as " work done per unit time"
therefore calculated by P= Work/time.
2- What is the units of Power?
Ans; It is watt denoted by "W"
3- Write a solved example?
Ans; Lets say we move a block from One place to another by using 10joules in 4 seconds.
so put values
P=work/time
P=10/4
P=2.5

Explanation:

Answer:

The coefficient of friction between the puck and the table is [tex]\sf 0.00784[/tex]

Explanation:

Here are some of the equations we will be using. Below are the equations for Work, Kinetic Energy, Potential Energy, Distance, and the Force due to Friction.

[tex]\sf W=fd[/tex]

[tex]\sf K_E=\sf \dfrac{1}{2}mv^2[/tex]

[tex]\sf U_E=mgh[/tex]

[tex]\sf d=\dfrac{tv_f}{2}+ \dfrac{tv_i}{2}[/tex]

[tex]\sf F_{Fr} =mg \mu_k[/tex]

Conservation of Energy

If there are frictional forces present, then the work done against the frictional forces is equal to the change in the total Mechanical Energy. The Mechanical Energy will decrease because of the work done against the frictional forces.

[tex]\sf W_{Fr}= \left(K_F+U_F\right)-\left(K_i+U_i\right)[/tex]

Lets put together some of these formulas now.

[tex]\sf -F_{Fr} d= \left(\sf \dfrac{1}{2}mv_f^2+mgh_f\right)-\left(\sf \dfrac{1}{2}mv_i^2+mgh_i\right)[/tex]

[tex]\sf -mg \mu_k\left(\sf \dfrac{tv_f}{2}+ \dfrac{tv_i}{2}\right)= \left(\sf \dfrac{1}{2}mv_f^2+mgh_f\right)-\left(\sf \dfrac{1}{2}mv_i^2+mgh_i\right)[/tex]

In this example our object is starting from rest and is on a flat surface, so we can cancel out any terms with [tex]\sf v_i[/tex] and [tex]\sf h[/tex].

[tex]\sf -mg \mu_k \left(\sf \dfrac{tv_f}{2}\right)= \left(\sf \dfrac{1}{2}mv_f^2\right)[/tex]

Lets solve for [tex]\sf \mu_k[/tex].

Combine [tex]\sf m[/tex] and [tex]\sf \frac{tv_f}{2}[/tex].

[tex]\sf -1\cdot g \cdot \mu_k \cdot \left(\sf \dfrac{m(tv_f)}{2}\right)= \left(\sf \dfrac{1}{2}mv_f^2\right)[/tex]

Combine [tex]\sf g[/tex] and [tex]\sf \frac{m(tv_f)}{2}[/tex].

[tex]\sf -1\cdot \mu_k \cdot\left(\sf \dfrac{g(m(tv_f))}{2}\right)= \left(\sf \dfrac{1}{2}mv_f^2\right)[/tex]

Combine [tex]\mu_k[/tex] and [tex]\sf \frac{g(m(tv_f))}{2}[/tex].

[tex]\sf -1\cdot\sf \dfrac{g(m(tv_f))\mu_k}{2}= \left(\sf \dfrac{1}{2}mv_f^2\right)[/tex]

Remove the parentheses.

[tex]\sf -1\cdot\sf \dfrac{gmtv_f\mu_k}{2}= \left(\sf \dfrac{1}{2}mv_f^2\right)[/tex]

Simplify the right side.

[tex]\sf -1\cdot\sf \dfrac{gmtv_f\mu_k}{2}= \sf \dfrac{mv_f^2}{2}[/tex]

Divide both sides of the equation by [tex]\sf -1[/tex].

[tex]\sf \sf \dfrac{gmtv_f\mu_k}{2}= -\sf \dfrac{mv_f^2}{2}[/tex]

Since the expression on each side of the equation has the same denominator, the numerators must be equal.

[tex]\sf gmtv_f\mu_k= -\sf mv_f^2[/tex]

Divide both sides of the equation by [tex]\sf gmtv_f[/tex].

[tex]\sf \sf \dfrac{gmtv_f\mu_k}{\sf gmtv_f}= \sf \dfrac{-mv_f^2}{\sf gmtv_f}[/tex]

On the left side cancel the common factor of [tex]\sf gmtv_f[/tex].

[tex]\sf \mu_k= \sf \dfrac{-mv_f^2}{\sf gmtv_f}[/tex]

On the right side cancel the common factor of [tex]\sf m[/tex].

[tex]\sf \mu_k= \sf \dfrac{-v_f^2}{\sf gtv_f}[/tex]

On the right side cancel the common factor of [tex]\sf v_f[/tex]

Finally we have an equation to evaluate the coefficient of friction.

[tex]\boxed{\sf \mu_k= -\sf \dfrac{v_f}{\sf gt}}[/tex]

Numerical Evaluation

In this example we are given

[tex]\sf v_f=1\\g=-9.81\\t=13[/tex]

Substituting our given values into the equation yields

[tex]\boxed{\sf \mu_k= -\sf \dfrac{1}{\sf -9.81\cdot 13}}[/tex]

[tex]\boxed{\sf \mu_k=0.007841292245}[/tex]

Rounding to the hundred thousandth leaves us with

[tex]\boxed{\sf \mu_k=0.00784}[/tex]

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The coefficient of kinetic friction between the puck and the table is approximately 0.0079.

The coefficient of friction is a measure of the amount of frictional force that exists between two surfaces in contact. It is denoted by the symbol μ (mu) and is defined as the ratio of the force of friction between two objects to the normal force that is pressing them together. In other words, it is a value that indicates how difficult it is to slide one object over another.

To resolve this issue, we need to use the equation of motion:

v = u + at

where v is the final velocity (1 m/s), u is the initial velocity (0 m/s), a is the acceleration, and t is the time (13 seconds).

We can rearrange this equation to solve for the acceleration:

a = (v - u) / t

a = (1 m/s - 0 m/s) / 13 s

a = 0.077 m/s²

Next, we can use Newton's second law of motion, which states that the net force acting on an object is equal to its mass times its acceleration:

Fnet = ma

where Fnet is the net force acting on the object, m is its mass (0.20 kg), and a is the acceleration we just calculated.

We know that the only horizontal force acting on the puck is the applied force of 2.0 N, so we can use that as the net force:

Fnet = 2.0 N

Setting Fnet equal to ma and solving for the coefficient of kinetic friction μk:

Fnet = ma

μkmg = ma

μk = a/g

μk = (0.077 m/s²) / 9.81 m/s²

μk = 0.0079

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The temperature inside a house can be influenced by various factors such as the geographic location, orientation of the house, insulation, and the type of construction materials used.

For instance, if a house is located in a hot and humid climate, it may become hot inside due to the external heat and humidity, even with air conditioning.

On the other hand, a house located in a cold climate may become cold inside, especially during the winter season, due to heat loss from the interior to the cold outside environment.

Proper insulation and efficient heating/cooling systems can help regulate the temperature inside a house and improve its energy efficiency.

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The car's speed at 10 s would be 20 m/s, and the final speed would be 40 m/s.

During the first 20 s, the car accelerates at a rate of 2 m/s², so its speed increases linearly. We can calculate the final speed at 20 s as follows:

a = 2 m/s²

t = 20 s

v = a * t = 2 m/s² * 20 s = 40 m/s

From 20 s to 60 s, the car continues at a constant speed, so the graph is a horizontal line at 40 m/s.

Therefore, the car's speed at 10 s is:

t = 10 s

v = a * t = 2 m/s² * 10 s = 20 m/s

And its final speed is 40 m/s

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We must take into account the relationship between the material's stress and strain, which is characterised by its Young's modulus, in order to establish the maximum axial force p that may be applied to the steel plate (E).

We must take into account the relationship between the material's stress and strain, which is characterised by its Young's modulus, in order to establish the maximum axial force p that may be applied to the steel plate (E). Assume that the cross-sectional area of the steel plate is A.

You can compute the tension on the steel plate as follows:

force x area equals stress

You may compute the strain on the steel plate as follows:

strain is equal to length change / starting length.

Hence, p = yield strength * area can be used to compute the maximum axial force p that can be applied to the steel plate without generating plastic deformation.

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Answer: 1CM CUBE OF LEAD

Explanation:

The acceleration of the textbook is a = F/m = 2.0 N/1.33 kg = 1.5 m/s². and the final velocity of the textbook is v = 0 + (1.5 m/s²)(0.75 s) = 1.125 m/s.

Acceleration is the rate at which an object changes its velocity over time. It is a vector quantity, meaning it has both magnitude and direction. An object's acceleration can be calculated by measuring the change in its velocity over time.

The net force acting on the textbook is the difference between the pushing force of 4.0 N and the frictional force of 2.0 N, which is 2.0 N.
According to Newton's Second Law, this net force of 2.0 N will cause an acceleration of the textbook given by the equation F = ma, where m is the mass of the textbook (1.33 kg) and a is the acceleration.
Therefore, the acceleration of the textbook is a = F/m = 2.0 N/1.33 kg = 1.5 m/s².

The final velocity of the textbook can then be calculated using the equation v = v0 + at, where v0 is the initial velocity (0 m/s, since the textbook was initially at rest), a is the acceleration (1.5 m/s²), and t is the time the textbook was pushed (0.75 m).
Therefore, the final velocity of the textbook is v = 0 + (1.5 m/s²)(0.75 s) = 1.125 m/s.

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The correct option is B. The respective charges on each mat are +1 MC y -3 MC.

Charge refers to a fundamental property of matter that describes how objects interact electromagnetically. The charge can be positive or negative and is measured in Coulombs (C). Objects with the same charge repel each other, while objects with opposite charges attract each other.

Electric charge can be transferred from one object to another through processes such as friction, contact, or induction. The movement of electric charge is the basis for electric current, which is the flow of charge through a conductor.

A charge is also a conserved quantity in physics, meaning that it cannot be created or destroyed, only transferred or redistributed. This conservation of charge is a fundamental principle in many areas of physics, including electromagnetism and quantum mechanics.

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Complete Question:

Two charged conductive mats of equal radius are supported by non-conductive supports.  Their respective charges are -3 C and +7 MC.  If both mats come into contact and are then separated, then the respective charges on each mat are:

A. -Z UC Y +2 CM

В.  +1 MS У -3 MS

C. +2 C and +2 MC

D. -1 MC and - 1 MC

Answer:

Below

Explanation:

The volume of water remains the same....the new measurement now includes the volume of the marble  ( 20 ml)

The region marked segment A occurs at 100 degrees Celsius and is the latent heat of vaporization.

The latent heat of vaporization is the amount of heat energy required to change the state of a substance from a liquid to a gas (vapor) at a constant temperature and pressure.

During the phase transition, the energy supplied to the substance is used to overcome the intermolecular forces of attraction between the particles, which allows the particles to escape from the liquid phase and enter the gaseous phase. This results in an increase in the internal energy of the substance, but with no change in temperature.

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Answer & Explanation:

incident ray

|

v

----------

| diamond |

----------

^

|

refracted ray

In this diagram, the incident ray of light is represented by the line pointing downward towards the diamond. The interface between the diamond and water is shown as a horizontal line. The refracted ray of light is represented by the line pointing upward away from the diamond.

When the incident ray of light passes from diamond into water, it will refract or bend due to the change in the speed of light between the two media. The exact angle of refraction depends on the refractive indices of the diamond and water, as well as the angle of incidence.

A ray of light starting from diamond is incident on the interface separating diamond and water is as shown in the figure.

When a light is going from medium 1 to medium 2. The refractive index is defined as a ratio of velocity of light in medium 1 to velocity of light in medium 2. Refractive index is the factor which deals with the amount of bending of light. More refractive index means more it will bend in the medium 2. When it is 1 we can say that light has not been bent.

By Snell's law, Refractive index is given by,

sin (i) ÷ sin (r) = μ₂÷μ₁

where i is the the angle of incidence

r is the angle of refraction

μ₂ & μ₁ are refractive index of medium 2 and 1 resp.

Light bends as it passes from diamond to water at an angle due to Refractive index between air and glass.

white light consist of number of colors, each color has its own wavelength. Refractive index of an optical medium changes with the wavelength, therefore each color of white light get splitted from white light this phenomenon is know as dispersion of the light.

Labeled diagram is shown in the figure.

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In one cycle of an engine, the net change in the entropy of both reservoirs (hot and cold together) is zero. This is because the entropy of each reservoir remains constant throughout the cycle.

Entropy is a measure of the randomness and disorder of a system, so the fact that the entropy of the two reservoirs remains constant throughout the cycle is a consequence of the law of conservation of energy. The engine cycle is designed so that the energy transfers between the two reservoirs cause the entropy of each reservoir to remain constant.

In an ideal cycle, the total amount of energy transferred from the hot reservoir to the cold reservoir is equal to the total amount of energy transferred from the cold reservoir to the hot reservoir. Thus, the net change in the entropy of both reservoirs is zero. This can be shown by examining the equation for the change in entropy of a system:

ΔS = Q/T, where Q is the energy transfer and T is the temperature.

The amount of energy transferred between the hot and cold reservoirs will be the same in both directions. Thus, the temperature ratio between the two reservoirs is the same. Since the energy transfer is the same, the change in entropy for both reservoirs is equal, and the net change in entropy is zero. This can be illustrated by the following equation:

ΔS = Q/T = Q/T + Q/T = 0.

In summary, the net change in the entropy is zero. This is due to the law of conservation of energy and the fact that the temperature ratio between the two reservoirs remains constant during the cycle.

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The speed of sound in air at 10°C is approximately 343 meters per second. Let's use the formula:

distance = speed x time

We want to find the time it takes for the sound to travel 210 meters to the top of the mineshaft. So we can rearrange the formula to solve for time:

time = distance ÷ speed

Plugging in the values we have, we get:

time = 210 ÷ 343

time ≈ 0.612 seconds

Therefore, it takes approximately 0.612 seconds for the sound to travel from the bottom to the top of the mineshaft.

The student should use the power supply to provide a voltage source (V), the resistance wire (R) and an ammeter (A).The circuit diagram is V-A- R (50cm) -V.

Resistance is the refusal to accept or comply with something. It is the opposition to a particular idea, policy, or course of action. Resistance can be seen in many forms, including physical, psychological, social, and political. Physically, it can be seen in the refusal to comply with a certain rule or law, or in the refusal to engage in a certain activity or behavior. Psychologically, it can be seen in the refusal to accept certain ideas, beliefs, or values. Socially, it can be seen in the refusal to engage in certain social practices or customs.

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It means that wave vibrates 12,000 times about its mean position per second.

Humans can hear sounds between about 20 Hz and 20,000 Hz (depending on the human!).

Below 20 Hz is called infrasound ("infra" means below), and above 20,000 Hz is ultrasound ("ultra" means beyond).

We are most sensitive to sounds between 1,000 and 4,000 Hz:

As we get older we are less sensitive to higher frequency sounds (a limit around 12,000 Hz is normal for an adult).

Vibration refers to the back-and-forth motion of an object or system about its equilibrium position. This motion can be periodic or random and can occur in a variety of mediums, including solids, liquids, and gases. Vibration is caused by a force or disturbance that creates an oscillation within the system.

Vibration can be both beneficial and detrimental. Beneficial vibrations can be used to create sound, power tools, and even musical instruments. On the other hand, detrimental vibrations can cause damage to structures, machinery, and even the human body. For example, exposure to high levels of vibration can cause hand-arm vibration syndrome or whole-body vibration syndrome, which can result in numbness, tingling, and even long-term health problems.

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Answer:

d. 4m/s²

Explanation:

pls mrk me brainliest

The car that got hit from behind will be going 48.05 m/s (or about 172.98 km/h) after the collision.

What is Collision?

In physics, a collision is an event where two or more objects come together and interact with each other, causing a transfer of energy and momentum between them. Collisions can be classified into two types: elastic and inelastic.

To solve this problem, we can use the conservation of momentum principle, which states that the total momentum of an isolated system remains constant before and after a collision. We can set up an equation for the conservation of momentum before and after the collision:

Before the collision:

(2209 kg)(31 m/s) + (1278 kg)(26 m/s) = total momentum

After the collision:

(2209 kg)(21 m/s) + (1278 kg)(vf) = total momentum

where vf is the final velocity of the 1,278 kg car after the collision.

Simplifying the equations, we get:

Before the collision: 76,079 kgm/s + 33,228 kgm/s = 109,307 kg*m/s

After the collision: 46,689 kgm/s + 1,278 kgvf = 47,967 kgm/s + 1,278 kgvf

Since the total momentum before and after the collision is the same, we can set the two equations equal to each other and solve for vf:

76,079 kgm/s + 33,228 kgm/s = 46,689 kgm/s + 1,278 kgvf

109,307 kgm/s = 47,967 kgm/s + 1,278 kg*vf

61,340 kgm/s = 1,278 kgvf

vf = 48.05 m/s

Therefore, the car that got hit from behind will be going 48.05 m/s (or about 172.98 km/h) after the collision.

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We know that Velocity = delta x /delta t = [-3 -1]cm/[5-0]s    = - 0.8 cm/s answer

Velocity is the direction at which an object is moving and serves as a measure of the rate at which its location is changing as seen from a specific point of view and as determined by a specific unit of time (for example, 60 km/h northbound). In kinematics, the area of classical mechanics that deals with the motion of things, velocity is a basic idea.

A physical vector variable called velocity must have both a value and a direction in order to be defined. Speed is the scalar absolute value (magnitude) of motion; it is a coherent derived unit whose amount is quantified in metres per second (m/s or m/s1) in the SI (metric system).

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Yes, the hotter block has more energy inside. This is due to the fact that the materials of the two blocks have different heat capacities. Heat capacity is the amount of heat energy that must be added to a material to increase its temperature by 1°C. Generally speaking, materials with higher heat capacities will require more heat to raise their temperature by 1°C than materials with lower heat capacities.

For example, if two blocks, one made of iron and one made of aluminum, were both placed in a fire and given the same amount of heat energy, the block made of aluminum would be hotter than the block made of iron. This is because iron has a higher heat capacity than aluminum, meaning it takes more energy to heat it up. Therefore, the aluminum block has absorbed more heat energy and has a higher temperature than the iron block.

In conclusion, after receiving the same amount of heat energy, the two blocks have different temperatures because they have different heat capacities. The block with the higher heat capacity (iron) requires more energy to raise its temperature, resulting in a lower temperature than the block with the lower heat capacity (aluminum).

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Two is the mechanical benefit of the pulley mechanism.

The mechanical advantage of a pulley system is the ratio of the output force to the input force. In this case, the person is pulling down with a force of 10 N to lift a 20 N object. Therefore, the mechanical advantage can be calculated as follows:

MA = output force / input force

MA = 20 N / 10 N

MA = 2

The mechanical advantage of the pulley system is 2. This means that for every 1 unit of force the person applies, the object is lifted with 2 units of force. In other words, the pulley system allows the person to lift the object with less force than would be required without the pulley system.

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The answers for the given questions about topic tension:

1. c.) More than ΔL

2. b.) <1

Light and strong, an aluminium rod is highly resistant to corrosion and is ideal for both indoor as well as outdoor use as it can withstand a variety of environmental conditions. Our aluminium rods, which are also referred to as aluminium round bars, are provided in the 6000 series, which has the greatest commercial versatility.

The mechanical sectors can use aluminium alloy wire rods for things like bolts, nuts, nails, needles, rivets, clips, and staples.

1.  stress = Y strain

(F /  A) = Y  (deltaL / L)

deltaL / L  = constant  (for this problem)

delta(L) / 1 = delta(L') / 2

delta(L') = 2 delta(L)

2. deltaL A  = constant

L_thick (2A) = Lthin (A)

L_thick / L_thing = 1/2  < 1

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Explanation:

Magnets are used to make a tight seal on the doors to refrigerators and freezers. They power speakers in stereos, earphones, and televisions. Magnets are used to store data in computers, and are important in scanning machines called MRIs (magnetic resonance imagers), which doctors use to look inside people's bodies

They will be unable to cover as much distance as light does.

The statement is: Light travels a certain distance in 2000 years. No, it is not possible for an astronaut, traveling slower than light, to go as far in 20 years of her life as light travels in 2000 years because the speed of light is constant and cannot be matched by anything with mass.

The speed of light in a vacuum is 299,792,458 meters per second (m/s), which is incredibly fast. On the other hand, the fastest spacecraft to ever leave Earth was NASA's New Horizons probe, which traveled at a speed of about 16.26 kilometers per second.

It would take this spacecraft 37,200 years to travel 2000 light-years. Astronauts cannot travel faster than the speed of light, and their velocity will always be lower than that of light. As a result, they will be unable to cover as much distance as light does.

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27.44 J of the potential energy of the book relative to the ground, when a 1.60 m tall person lifts 1.40 kg of the book off the ground.

A 1.60 m m tall person lifts a 1.40 kg book off the ground so it is 2.00 m m above the ground.

The potential energy of the book relative to the ground would be:

PE = mgh

Where PE is the potential energy,

m is the mass,

g is the acceleration due to gravity, and

h is the height

The acceleration due to gravity is constant and is 9.8 m/s²

mass m = 1.40 kg

Height h = 2.00 m

mgh = 1.40 × 9.8 × 2.00 = 27.44 J

Ans: The potential energy of the book relative to the ground is 27.44 J.

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The angular velocity of the disc after 2.0 seconds if the disc starts from rest based on the torque rotation graph is 100 rad/s.

A torque versus rotations graph is a visual representation of the relationship between the torque applied to an object and the resulting rotations produced by that torque.

Typically, the torque is plotted on the vertical axis, while the rotations are plotted on the horizontal axis. The resulting graph usually shows a linear relationship between torque and rotation, with the slope of the line indicating the object's rotational inertia or resistance to rotation.

The graph can be used to determine the amount of torque required to produce a certain amount of rotation in an object. Based on the graph, the correct option is A.

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We need to aim the rifle 47.154 meters ahead of the bird's current position to intercept its flight path and hit it.

Since we are ignoring gravity, the horizontal velocity of the bullet will remain constant and equal to the muzzle velocity of the rifle, which is 366 m/s.

To hit the bird, we need to aim the rifle ahead of the bird such that the bullet intercepts the bird's flight path at the same point in space where the bird will be when the bullet arrives.

time = distance / velocity

time = 30 m / 366 m/s

time = 0.08197 s

During this time, the bird will have flown a distance equal to its speed multiplied by the time:

distance = speed x time

distance = 171 km/h x (0.08197 s)

distance = 47.154 m

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