for this situation, i push on a heavy chair. suppose i push moderately on the chair, and this time the chair does move. then the strength of the force the chair exerts on me is

The plane's (flies due north at 150 km/hr relative to the air. there is a wind blowing at 75 km/hr to the east relative to the grounds) speed relative to the ground = 170 km/hr

A quantity or phenomenon with independent properties for both magnitude and direction is called a vector. To determine the plane's speed, we can use the vector equation.

v = (v₁² + v₂²)[tex]^{1/2}[/tex]

Where,

v = The velocity (m/s)

v₁ = The velocity (to north)

v₂ = The velocity (to east)

Hence,

v = {(150 km/hr)² + (75 km/hr)²}[tex]^{1/2}[/tex]

= 170 km/hr

So, the plane's speed relative to the ground = 170 km/hr

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The height of the cliff is 200 meter where potential energy of the boulder is measured.

Potential energy in physics is the energy that an item retains as a result of its position in relation to other objects, internal tensions, electric charge, or other elements.

The gravitational potential energy of an item, the elastic potential energy of a stretched spring, and the electric potential energy of an electric charge in an electric field are examples of common types of potential energy.

The height of the cliff is = 90,000 ÷ (45 ×10) meter = 200 meter.

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To calculate the magnitude and duration of the deceleration, we need to know the initial velocity of the child and the stopping distance. The initial velocity of a freely falling object can be calculated using the equation:

v = sqrt(2gh), where g is the acceleration due to gravity (9.8 m/s^2), and h is the height.

In this case, h = 0.57 m, so the initial velocity can be calculated as follows:

v = sqrt(2 * 9.8 * 0.57)

v = 2.38 m/s

Now we have the initial velocity, we can calculate the magnitude and duration of the deceleration in both cases.

Case 1: Hardwood floor

The stopping distance can be calculated using the equation:

d = v^2 / (2a), where v is the initial velocity and a is the deceleration.

Setting the stopping distance equal to 2.1 mm and solving for a, we get:

a = v^2 / (2d)

a = (2.38 m/s)^2 / (2 * 0.0021 m)

a = 68 m/s^2

The duration of the deceleration can be calculated as follows:

t = v / a

t = 2.38 m/s / 68 m/s^2

t = 0.0349 s

Magnitude of the deceleration: 68 m/s^2

Duration of the deceleration: 0.0349 s

Case 2: Carpeted floor

The stopping distance can be calculated using the equation:

d = v^2 / (2a), where v is the initial velocity and a is the deceleration.

Setting the stopping distance equal to 1.4 cm and solving for a, we get:

a = v^2 / (2d)

a = (2.38 m/s)^2 / (2 * 0.014 m)

a = 12 m/s^2

The duration of the deceleration can be calculated as follows:

t = v / a

t = 2.38 m/s / 12 m/s^2

t = 0.198 s

Magnitude of the deceleration: 12 m/s^2

Duration of the deceleration: 0.198 s

The magnitude of the deceleration in the first case (hardwood floor) is much greater than in the second case (carpeted floor), indicating a higher risk of injury for the child in the first case. However, the duration of the deceleration is much shorter in the first case, which might result in a less severe injury. The duration of the deceleration is also much longer in the second case, indicating a lower risk of injury.

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Streak is a material property that characterizes particular mineral's coloration.

The mineral is an ingredient or chemical component that has emerged as a result of natural formations and is often crystalline in nature. Examples include the minerals quartz, feldspar, calcite, sulfur, and clays like kaolinite and smectite.

Minerals are necessary building blocks for our daily lives and are fundamental to the advancement of economic, social, and technological systems. For instance, consider the following: Agriculture: Additional mineral products are also utilized to improve soil, including phosphate rock, potash, and lime.

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The height of a column of mercury (in mm) in a manometer for this pressure if the density for mercury is 13600 kg/m3 will be 20 mm.

The height of a column of mercury in a manometer for a given pressure can be calculated using the equation:

ΔP = ρgh

where:

ΔP = the pressure difference between the two arms of the manometer

ρ = the density of mercury

g = the acceleration due to gravity

h = the height of the mercury column

Assuming that the pressure is given in Pascals (Pa), the equation can be rewritten as:

h = ΔP / (ρg)

Since the density of mercury is given in kg/m3, we first need to convert it to kg/mm3:

ρ = 13600 kg/m3

= 13600 kg / (1000 mm)3

= 0.0000136 kg/mm3

The acceleration due to gravity is approximately 9.81 m/s2, which is equivalent to 0.00981 mm/ms2. Therefore:

h = ΔP / (ρg)

= ΔP / (0.0000136 kg/mm3 x 0.00981 mm/ms2)

= 8977.5 x ΔP

= 8977.5*2.6737

 ~ 20 mm                              

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The least horizontal force required to move the block is 4.0 N.

A force that holds an object at rest is called static friction.

The definition of static friction is: The resistance people feel when they attempt to move a stationary object across a surface without actually causing any relative motion between their body and the surface they are moving the object across.

Weight of the block = 16 N

The coefficient of friction between both surface is 0.25,

Hence, the least horizontal force required to move the block is = frictional resistance force

= 0.25 × 16 N

= 4 N.

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The kinetic energy that the electron gain is calculated to be as : 3J

Kinetic energy of an object is the energy that it possesses due to its motion and is defined as the work needed to accelerate body of a given mass from rest to its stated velocity

As, V = Ed

where V is electric potential energy, E is electric field and d is distance moved by the electron.

The electric field is :

E = V / d

V1/d1= V2/d2

d2= 0.2 - 0.15= 0.05m

V2 = V1d2/d1 = 60 N/C * 0.20 m = 3 J

ΔK = ΔV = 3 J

So, the electron gains 3 J of kinetic energy.

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When two objects have the same momentum, the less massive one will move more quickly and, as a result, have more kinetic energy.

When two objects of equal mass are in motion, the thing moving faster will have more kinetic energy. The kinetic energy of an item in motion is inversely proportional to both its mass and the square of its velocity. As a result, an object with the same mass and speed will have twice as much kinetic energy as an object with the same mass and speed but double the speed will have four times as much kinetic energy. Therefore, a body with a light mass has higher kinetic energy due to its lower mass. The kinetic energy is greater.

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Beta-pleated sheets and alpha-helices are the most typical structures that are created. Hydrogen bonds that develop along protein backbone bind the two of them together.

Protein structure is divided into four levels: primary, second, tertiary, and quaternary. To completely comprehend how a protein functions, it is useful to comprehend the nature and purpose of each level of a protein's structure. Through Tracy Kovach.

DNA isn't a protein, though. DNA encrypts data required to produce proteins, which is the main connection between DNA and proteins. DNA, however, isn't a protein. Long strands of nucleotides make up DNA.

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If a 30-meter long rope hangs freely from a ledge then the work done if the top 1/3 of the rope is pulled up to the ledge is  4900 Joules.

To solve this problem, we need to first find the mass of the rope. We know that the density of the rope is 5 kg/m, and the length of the rope is 30 meters. Therefore, the total mass of the rope is:

mass = density * length

mass = 5 kg/m * 30 m

mass = 150 kg

Next, we need to find the mass of the top 1/3 of the rope that is pulled up to the ledge. We can do this by multiplying the total mass of the rope by the fraction of the rope that is pulled up, which is 1/3:

mass_pulled = (1/3) * mass

mass_pulled = (1/3) * 150 kg

mass_pulled = 50 kg

Now that we know the mass of the part of the rope that is pulled up, we can find the change in potential energy of the rope when it is lifted to the ledge. The change in potential energy is given by:

ΔPE = mgh

where m is the mass of the object, g is the acceleration due to gravity, and h is the change in height. In this case, the change in height is equal to 1/3 of the length of the rope, or 10 meters.

ΔPE = mass_pulled * g * h

ΔPE = 50 kg * 9.8 m/s^2 * 10 m

ΔPE = 4900 J

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the heat for system undergoing change is -434 J.

During a thermodynamic process, a system's heat exchange with its surrounds is equal to the system's change in internal energy plus the work the system has done on its surroundings. This connection can be stated as follows:

Q = ΔU + W

where Q represents the heat transferred, U represents the change in internal energy, and W represents the work the system does on its surroundings.

Given that the system's energy changed by -471 J and it exerted 37 J of work on its surroundings, we can compute the heat exchanged as follows:

Q = ΔU + W

Q = -471 J + 37 J

Q = -434 J

The heat for this process was -434 J as a result.

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The required centripetal acceleration of the roller car at the lowest point on the track is calculated to be 12.04 m/s².

Mass of the roller coaster is given as 2.1 × 10³ kg.

The track's radius of curvature is 24 metres.

Tangential speed is 17 m/s.

Equation of force is known to be, F = m a

F n - F g = m v²/r

F n = m ( v²/r + g)

F n = 2100 (17²/24 + 9.8) = 45,867.5 N

Centripetal acceleration is ac = v²/r = 17²/24 = 12.04 m/s²

Thus, centripetal acceleration of the roller car is calculated to be 12.04 m/s².

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An example of low-quality energy heats in the ocean.

Low-quality energy is energy that has a low density and requires a lot of effort to convert into a usable form. This type of energy is not easily accessible and requires significant energy input to harness its potential. An example of low-quality energy heats in the ocean.

Unlike fossil fuels such as gasoline, which have a high energy density and can be easily converted into usable energy, heat in the ocean is dispersed and difficult to harness. Extracting usable energy from ocean heat requires significant energy input and technology, making it a low-quality form of energy.

In contrast, high-quality energy sources such as fossil fuels, nuclear fission, and electricity have a high energy density and are relatively easy to harness and convert into a usable form.

Complete question:

What is an example of low-quality energy?

a. food

b. heat in the ocean.

c. gasoline

d. nuclear fission

e. electricity

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Between points a and b, an automobile moves in a straight line. the two sites are 550.0 meters apart, and the speed is 50.0 meters per second with an acceleration of 30 miles per hour.

The pace at which speed changes is known as acceleration. Because the path of an object's velocity is shifting even while it follows a circular course, it continues to accelerate.

The three main categories of accelerated motions are uniform, non-uniform, and average acceleration. When an item moves in a straight path with an increase in speed occurring at regular intervals of time, this motion is referred to as having uniform acceleration.

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So 144.0 W is required to accelerate the identical projectile from rest to a launch speed of 2v in time t.

Projectile motion is the motion of an item hurled or projected into the air that is only affected by gravity's acceleration. The item is known as a projectile, and its course is known as its trajectory. Projectile motion is a type of motion in which an item follows a parabolic path. The route taken by the item is referred to as its trajectory. When a force is applied at the start of the launch trajectory, projectile motion begins (after this the projectile is subject only to the gravity).

Here,

The power required to accelerate a projectile is given by the equation:

P = m * a²/t

where m is the mass of the projectile, a is its acceleration, and t is the time it takes to reach the desired speed. The launch speed, v, is related to acceleration, a, by the equation:

v = a * t

So we can substitute v = a * t into the first equation to get:

P = m * v²/t

If we want to find the power needed to accelerate the projectile from rest to a launch speed of 2v in a time of t, we can plug in v = 2 * v and solve for P:

P = m * (2 * v)² / t = 4 * m * v² / t

Since we know that the power needed to accelerate the projectile from rest to its launch speed v in a time t is 36.0 W, we can substitute that into the above equation to find the power needed to accelerate the projectile to a launch speed of 2v:

P = 4 * m * v² / t = 4 * 36.0 W = 144.0 W

So the power needed to accelerate the same projectile from rest to a launch speed of 2v in a time of t is 144.0 W.

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The advantages includes Reduced light pollution from Earth's atmosphere, lack of atmospheric turbulence for clearer observations, access to different astronomical phenomena and celestial objects Protection from solar radiation and cosmic rays and extended periods of darkness for uninterrupted observations. All options are correct.

There would be many benefits if an observatory were constructed on the lunar surface. First, less light pollution from the Earth's atmosphere would be present, making it easier to observe celestial objects.

Secondly, the Moon's lack of atmospheric turbulence would create stable viewing conditions, reducing distortions and enhancing image clarity.

Thirdly, having access to many astronomical phenomena and celestial objects would offer special research opportunities. Fourthly, more sensitive studies would be possible due to the lunar surface's partial shielding from solar and cosmic rays.

The prolonged darkness on the Moon would also allow for uninterrupted observations free from light pollution.

Thus, all options are correct.

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Your question seems incomplete, the probable complete question is:

the moon has no sustained atmosphere. what advantages would you have if you built an observatory on the lunar surface? (select all that apply.)

A) Reduced light pollution from Earth's atmosphere.

B) Lack of atmospheric turbulence for clearer observations.

C) Access to different astronomical phenomena and celestial objects.

D) Protection from solar radiation and cosmic rays.

E) Extended periods of darkness for uninterrupted observations.

If a firefighter dropped a person onto the safety net, and right before the person hit the net they had a velocity of 12m/s and 1800 J of kinetic energy, then 28.70 kg was the mass of the person.

Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, is performed on it by exerting a net force. A moving object or particle has kinetic energy, which relies on both its mass and its rate of motion.

The type of motion might be vibration, rotation on an axis, translation (or travel along a path through one point to another), or any combinations of these.

E= mv²/2

m(11.2)²/2= 1800.

m(11.2)²= 3600

125.44m= 3600

m= 3600/125.44= 28.70 kg

Therefore,  28.70 kg was the mass of the person.

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The mass of the brass ball is 288 N on planet and 235.2 N on Earth.

The force of gravity caused by the Earth on the ball is the gravitational attraction between the Earth and a ball that is placed at the surface of the Earth.

This force's magnitude is indicated as follows:...

Here, m is the object's mass and g is the acceleration brought on by gravity on Earth.

The weight of the thing on Earth determines the gravitational force that exists as a result.

The brass ball weighs 17 kg, or m.

The gravitational acceleration at a certain planet is equal to.

The magnitude of the Earth's gravitational acceleration is,

The position or placement of an object has no bearing on its mass. Consequently, the quantity of brass The mass of the brass ball on the Earth is identical to the mass of the brass ball on the planet, which is 17 kg, therefore the ball will remain the same on both the Earth and the planet.

Therefore, the brass ball has a mass of 17 kg both on Earth and throughout the planet.

The brass ball weighs the following on Earth:

The metal ball's mass in relation to the earth is:

Put the values into the box to get:

As a result, the brass ball weighs 288 N on planet and 235.2 N on Earth.

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The supplied assertion states that a proton experience would be forced in the same field at -2.24 i^ pN

The main distinction is that whereas as proton is a charged particles particle found inside the atom's nucleus, a particle is a highly reactive particle that orbiting the nucleus. Two up neutrons and one drop quark are found in protons. One up atom and five down quarks make up neutrons. The "strong nuclear force," one of the four basic forces, holds the nucleus together (gravity and electromagnetism are two others).

Charge q = -1*10⁻⁶C

Electrostatic force F = 14 i^ N

The electric field is

       E = F/q

          = (14 i^ N) / (-1*10⁻⁶ C)

          = -14*10⁶ i^ N/C

The force on a proton is:

   F = qpE

      = (1.6*10⁻¹⁹ C)(-14*10⁶ i^ N/C)

      = -22.4*10⁻¹³ i^ N

      = -2.24*10⁻¹² i^ N

      = -2.24 i^ pN

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The complete question is-

1.0 µC charge experiences a 14 i N electric force in a certain electric field. What force would a proton experience in the same field?

The shortest open-open tube needed to produce a 20 Hz frequency is 8.5 meters.

In physics, the frequency is the number of waves that pass a specific place in a unit of time. It also shows how many vibrations or cycles a body in periodic motion goes through in a certain amount of time.

The following equation can be used to determine the length of an open-open tube that generates a specific frequency:

[tex]L = \frac{c }{(2 \times f)}[/tex]

where L is the tube's length, c is sound in the air's speed (about 340 m/s), and f is the sound's frequency.

Inputting the values provided yields:

[tex]L =\frac{ 340}{ (2 \times 20)}[/tex]

L = 340 / 40 = 8.5 m.

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Blue light has a greater frequency and carries more energy than red light when compared.

Electromagnetic frequencies that can be seen by human eyes make up visible light. This spectrum excludes ultraviolet and infrared radiation. The wavelengths and frequencies that an object reflects determine the colours we see. Both waves and particles of light exist. It has wave characteristics like amplitude, period, wavelength, and frequency.

The number of times a wave completes a cycle each second is known as its frequency. Hertz, or cycles per second, is the unit of measurement (Hz).

There is more energy in the light the higher the frequency. As a result, its wavelength shrinks.

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The normalization of a wave function is a property that can change over time as the wave function evolves due to the Schrödinger equation. However, it can be shown that if a wave function is normalized at one time, it will remain normalized at all later times if the Hamiltonian operator is a self-adjoint operator.

The time evolution of a wave function is given by the Schrödinger equation, which is a partial differential equation that describes the evolution of a wave function over time. The Schrödinger equation can be written as:

iℏ ∂ψ/∂t = H ψ

where ψ is the wave function, H is the Hamiltonian operator, and i is the imaginary unit. The Hamiltonian operator describes the total energy of the system and includes the kinetic and potential energy of all particles in the system.

If the Hamiltonian operator is a self-adjoint operator, it can be shown that the norm of the wave function (i.e. the square of the wave function integrated over all space) is constant in time, meaning that the wave function will remain normalized as it evolves over time. In other words, if the wave function is normalized at one time, it will remain normalized at all later times.

This property is a result of the unitary nature of quantum mechanics, which ensures that probabilities are conserved in time. The norm of the wave function represents the probability density, so if the wave function is normalized, the probabilities of all possible outcomes add up to 1.

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The magnitude and the direction angle of the vector from the airport to the plane are 7.93 and 34° respectively.

A vector's orientation, or the angle it creates with the x-axis, determines its direction.

Direction of the vector can be given by using the formula:

θ = [tex]tan^{-1}[/tex] [tex]\frac{b}{a}[/tex]

Magnitude of the vector can be given by using the formula:

[tex]\sqrt{a^{2} + b^{2} }[/tex]

As per the question,

Position vector = (6, 5.2)

Now, the magnitude of the position vector = [tex]\sqrt{6^{2} + (5.2)^{2} }[/tex], which comes out to be 7.93.

Next, direction angle of the vector:

[tex]tan^{}\alpha[/tex] = [tex]\frac{6}{5.2}[/tex]

[tex]tan^{} \alpha[/tex] = 1.15

[tex]\alpha[/tex] = [tex]tan^{-1}(1.15)[/tex] = 56°.

The direction angle of the vector, θ = 90 - 56 = 34°.

A geometrical entity with both magnitude and direction is a vector. A vector's magnitude is determined by its length. It summarises the numerical value of the vector. The magnitude of a vector is always positive. Things like velocity, displacement, momentum, force, etc. are examples of vectors. In the case of a three-dimensional vector, the measurements made along the x, y, and z axes are combined.

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Complete question is:

a plane is located on radar by an air traffic controller. what are the magnitude and the direction angle of the vector from the airport to the plane? Refer the image for a complete question.

The distance between the flat plates in the capacitor which has a capacitance of 1F is 8.85 x 10⁻¹² m

The distance between the two flat metal plates is very small. Thus, the capacitor cannot be constructed.

The area of the two flat plates = 1 m²

The capacitance of the device = 1 F

The distance between the plates in the capacitor can be found using the formula,

           C = Aε₀ / d

where C is the capacitance of the capacitor

           A is the area of the plates

           ε₀ is the permittivity of free space

           d is the distance between the plates in the capacitor.

Let us rearrange the equation,

            d = Aε₀ / C

Let us substitute the known values in the above equation, we get

            d = 1 x 8.85 x 10⁻¹² / 1

               =  8.85 x 10⁻¹² m

As the distance between the plates is very small, the charge cannot be stored between the plates in the capacitor.

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The longest visible light wavelength is chosen by a fashion designer to reflect in a new line of apparel. So, It will be red to the human eye.

Only a portion of the electromagnetic spectrum can be seen by the human eye. The "visible spectrum" is the area of the electromagnetic spectrum that we can see. The wavelength of light varies with each color.

Violet, Indigo, Blue, Green, Yellow, Orange, and Red are the visible colors, going from shortest to longest wavelength.

Higher frequency corresponds to higher energy. Red light is less frequent since it has lower frequency and less energy than other visible lights. Since the relationship between frequency and wavelength is inverse, red light has the longest wavelength.

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The voltage, charge, and surface area of parallel-connected capacitors are identical.

Two plates make up a parallel plate capacitor, which is divided by a thin layer of insulating material called a dielectric. Charge is always conserved in a capacitor, and it will flow to keep the potential constant. Each capacitor has the same voltage V across its plates because they are all linked in parallel. However, the amount of charge that each capacitor in the parallel network can hold may vary. Equivalent coulomb charges will always be present across the plates of two or more capacitors connected in series. Greater capacity to hold electric charge is offered by larger plates. Consequently, capacitance rises as plate area increases.

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Answer:

5 yearssssssssssssssss

To find the speed 2.16 seconds later, we can use the formula for velocity with constant acceleration: v = v0 + at

where v0 is the initial velocity (assumed to be 0 m/s), a is the acceleration (4.24 m/s2), and t is the time elapsed (2.16 s).

Plugging in the values, we get: v = 0 + (4.24 m/s2) * (2.16 s) = 9.06 m/s

The relationship between time and the sprinter's speed is linear. As time passes, the sprinter's speed increases with a constant acceleration. The speed of an object with constant acceleration can be calculated using the equation v = u + at, where u is the initial velocity, a is the acceleration, and t is time. In the case of the sprinter, as she starts to run with an acceleration of 4.24 m/s2, her speed increases by the product of her acceleration and the time elapsed. Hence, the longer the time elapsed, the higher her speed will be.

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The speed of the four cars is 2.5 m/s and the mechanical energy lost in the collision is [tex]-3.75 \times 10^4 J[/tex]

We are given the following parameters:

[tex]m_1=2.5 \times 10^4 kg[/tex]

[tex]& m_2=3 m_1 \\[/tex]

[tex]& v_1[/tex] = speed of car = [tex]4 \mathrm{~ms}^{-1} \\[/tex]

[tex]& v_2[/tex] = speed of three cars = [tex]2 \mathrm{~ms}^{-1}[/tex] .

The law of conservation of linear momentum states that in an isolated system, the total momentum of the objects before a collision is equal to the total momentum after the collision, assuming no external forces are acting on the system.

Using the law of conservation of Linear momentum, we get,

[tex]\Delta p=0 \\[/tex]

[tex]\quad p_i=p_f \\[/tex]

[tex]m_1 v_1+m_2 v_2=\left(m_1+m_2\right) v_f \\[/tex]

[tex]m_1 v_1+3 m_1 v_2=\left(m_1+3 m_1\right) v_f \[/tex]

[tex]\Rightarrow v_f=\frac{m_1\left(v_1+3 v_2\right)}{4 m_1}=\frac{v_1+3 v_2}{4} \\[/tex]

= (4 + 3*2)/4

[tex]v_f=2.5 m/s[/tex]

Now, the loss in mechanical energy can be found by,

[tex]\Delta k=k_f-k_i[/tex]

Substituting the energies we get,

[tex]\Delta K & =\frac{1}{2}\left(m_1+3 m_1\right) v_f^2-\left[\frac{1}{2} m_1 v_1^2+\frac{1}{2} 3 m_1 v_2^2\right] \\[/tex]

[tex]& =\frac{1}{2} 4 m_1 v_f^2-\left(\frac{1}{2} m_1 v_1^2+\frac{3}{2} m_1 v_2^2\right)[/tex]

Therefore,

[tex]\Delta k & =\frac{1}{2} 4\left(2.5 \times 10^4\right)(2.5)^2-\left(\frac{1}{2} \times 2.5 \times 10^4 \times 4^2+\frac{3}{2}\left(2.5 \times 10^4\right)(2)^2\right) \\[/tex]

[tex]\Delta K & = -3.75 \times 10^4 J[/tex]

Hence, the speed of the four cars is 2.5m/s and the mechanical energy lost in the collision is [tex]-3.75 \times 10^4 J[/tex]

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The complete question is -

A railroad car of mass [tex]2.5 \times 10^4[/tex] kg is moving with a speed of 4 m/s. it collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2m/s. what is the speed of the four cars after the collision? how much mechanical energy is lost in the collision?

Two billiard balls collide, the type of collision is Elastic collision.

An elastic collision is a collision that has no loss in kinetic energy in the system as a conclusion of the collision. Both parameters that momentum and kinetic energy are conserved quantities in elastic collisions that is the net result is zero. Consider two alike trolleys moving toward each other at the same speed.

Two billiard balls collide with each other and then move separately after the collision. Two billiard balls of the same mass are moving straight toward each other at a similar speed. They meet each other head-on in an elastic collision.  An elastic collision occurs between two bodies in which the total kinetic energy of the two bodies will be the same.

So we can conclude that elastic collision is the collision between two billiard balls.

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