a 1600kg car is traveling over a hill that has a radius of curvature of 25m. the car is slowing down as it goes over the hill. it slows down at a constant rate from a speed of 25ms to a speed of 10ms over a distance of 50m ending at the top of the hill. the net acceleration of the car at the top of the hill is most nearly
a. 5.3 m/s/s.
b. 9.3 m/s/s.
c. 4.0 m/s/s.
d. 26 m/s/s.
e. 6.6 m/s/s.

exothermic reaction is  the bonds that are broken during the reaction are weaker than the bonds that are formed during the reaction.

Exothermic reactions are those in which the system releases heat into the environment. The temperature of the surroundings rises because it is absorbing heat from the system. Heat is released during the combustion of methane gas, making the reaction exothermic. Specifically, 1mol of methane burns to produce 890.4 kilojoules of heat energy. There are two ways to represent this data as a component of the balanced equation. First, the product side of the reaction can be used to record the amount of heat released. Another option is to write the H information as 890.4kJ, with a negative sign. In an exothermic reaction, the product's bonds are stronger than those of the reactants and have a higher bond energy.

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The correct statements are:

Therefore, option D is correct.

Light has always been known to travel in a straight line. Light does not bend while travelling but instead follows the shortest path between the starting point and the endpoint, which is a straight line.

The speed of light in air is the fastest known speed, hence, light travels faster than sound in air.

For a rough surface, reflected light rays scatter in all directions in a phenomena called diffuse reflection.

Diffuse reflection is when light hits an object and reflects in lots of different directions.

Hoever, for opaque materials, light absorbed and not reflected.

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The electric field at the center of the metal ball due only to the charges on the surrounding of the metal ball is 0 N/C.

The electric field is defined as the force acting on a positive test charge, per unit charge. units are thus N/C for the electric field. It is similar to the gravitational field on the surface of the Earth for a test mass mo

The electric field is a vector field. It has a magnitude and a direction. Another example is vector field is the wind distribution. Temperature distribution is an example of a scalar field.

Lines indicate the direction of F if a test charge is placed there, Field lines point away from positive charge, and toward negative charge, density of lines indicates the strength of the field.

Field lines cannot cross. If they did, there would be more than one possible direction for a particle to travel at a given point. The lines themselves have no meaning the field is present everywhere.

Since metal ball is considered as a solid sphere So the electric field inside metal ball is given by E=(p/3Eo)г

Where r is the distance from center and rho is charge density. Hence at the centre r=0

Then electric field =(p/3Eo)* 0 = 0 N/C

Hence electric field at the centre of the metal ball due to it's own charge only is 0  N/C.

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Mass of the brown. dwarf., M₂ = 4.132 * 10²⁷ kg

Let M₁ = Mass of the main-sequence star

M₂ = Mass of the brown dwarf

v₁ = speed of the main-sequence star

v₂ = speed of the brown dwarf

The system's average distance apart r₁ = r₂ = 1 AU

The brown dwarf's orbital speed is 22 times that of a star in the main sequence.

Consequently, v2 = 22 v1.

Considering that the Sun is a main-sequence star

2 * 1030 kg is the main-sequence star's mass.

Centripetal force: F = Mv2/r

M1v12 = M2v22 M2/M1 = v12/v22 M2/M1 = (1/22) M1v12 = M2v22/r2 M2v22/r2

2 M2/M1 = 0.002066 M2 = 0.002066M1 M2 = 0.002066*2*1030 M2 = 4.132*1027 kg

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The age of the object can be found using the equation   [tex]t=\frac{1}{k}ln\frac{[A_{0} ]}{[A]}[/tex].

The rate of decay:

In contrast to chemical reactions, the decay of a certain nucleus cannot be predicted and is unaffected by physical factors like temperature. There are two factors that affect the rate of isotope decay. The average number of undecayed nuclei in the system must double, as must the rate of decay for undecayed nuclei. the isotope's stability because some decay more quickly than others. The number of nuclei that decay per second is determined by the rate of decay.

The rate of the Decay is given as

                   [tex]\frac{-dA}{dt} =k[A][/tex]

On integrating the above we have

                 [tex]ln\frac{[A_{0} ]}{[A]}=kt[/tex]

                         [tex]t=\frac{1}{k}ln\frac{[A_{0} ]}{[A]}[/tex]

The number of nuclei has no bearing on the likelihood that a fixed nucleus would decay. Each nucleus has a predetermined likelihood of decaying in a certain length of time. The number of decaying nuclei will rise as the number of nuclei increases, but that is actually to be expected.

It's similar to rolling a large number of dice; the proportion of dice showing a particular digit to the total number of dice you roll. Keeping with this scenario, let's say you take away a dice if it displays 1. This is comparable to the disintegration of a nucleus. The number of dice eliminated will initially be large, but as the number of dice decreases, so will the number being removed.

The age of the object can be found using the equation:

                            [tex]\frac{-dA}{dt} =k[A][/tex]

                             [tex]t=\frac{1}{k}ln\frac{[A_{0} ]}{[A]}[/tex]

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The radius of strut so that the round and struts have same cross-sectional area = 2.764 mm and the critical load of a strut =  3.95*[tex]10^{-3}[/tex].

Let Radius for a round strut = 'r'

Now, Square Strut:

As, method Cross Section is 24 X 1 ([tex]mm^{2}[/tex])

So, Area, A' of cross-section = 24*1 = 24 [tex]m^{2}[/tex]

>> As, Area of round cross-section, A = pi*[tex]r^{2}[/tex]

Now, Given that, Both have same cross-section area

=> pi*[tex]r^{2}[/tex]  = 24

Solving,

=> r = radius of round cross-section = 2.764 mm

>> Now, According to Buckling Criteria,

Critical Load for a Stru, Pcr = (pi*[tex]r^{2}[/tex]*E*I)/Le[tex]q^{2}[/tex]

>> Now, as both Struts or columns are simple supported at both ends

So, Leq = L = 1 m

Also, E = 200 GPa = 200*[tex]10^{9}[/tex] N/m2

Now, I = Moment of Inertia

As, For Round Strut,

I = pi*[tex]r^{4}[/tex]/4 = pi*2.7644/4 = 45.837 = 45.837*[tex]10^{-12}[/tex]

=> Pcr = pi*[tex]r^{2}[/tex]*200*109*45.837*10-12/12

Solving,

=> Pcr = 0.0905 kN  (CRITICAL LOAD FOR ROUND)

>> Now, For Strut,

As, Buckling places about axis with minimum Moment of Inertia

So, Imin = a*[tex]b^{3}[/tex]/12 = 24*1*1*1/12 = 2   = 2*  [tex]10^{-12}[/tex]

So, Putting every values in Critical Equation:

Pcr = p[tex]i^{2}[/tex]*200*[tex]10^{-9}[/tex]*2*[tex]10^{-12}[/tex]/12

=> Pcr = 3.95*[tex]10^{-3}[/tex] kN (REQUIRED CRITICAL LOAD STRUT)

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The mass of the solid cylindrical wheel is 71.14 kg .

What is mass?

Measuring inertia, a property of all stuff that cannot be changed. What a body of matter is in essence is the resistance it provides to a change in its speed or position brought about by the application of a force.

What is acceleration ?

Acceleration is the term for the rate of change in speed. In most cases, but not always, acceleration denotes a shift in speed. An object is still moving in a circular path, but the direction of its velocity is changing, thus it is still gaining speed.

final angular speed of wheel is

w = 50 rev/m/n = 50 * 2π/ 60 = 1rev/ min = 2π/ 60 rad/s

w = 10π/6 rad/s

work done w = 590 J

radius of wheel is r = 1.10 m

as we know that work done in rotating of wheel is

W = 1/2 I W²,

Where I is moment of inertia of the wheel

moment of inertia of a solid cylindrical wheel is

I = 1/2 mr², where m is mass

∴ W = Hw/ r²w²

m= 4*590/ (1.10)² ( 10π/6) ² = 4* 590* 36/ 1.21* 100 π²

m= 71.14 kg

Therefore, mass of the solid cylindrical wheel is 71.14 kg .

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Yellow is first positioned at the angle that is most apparent, which is 0° (90°). Black is then positioned at a 45° angle, making it the color that is most noticeable. Then, the cyan and magenta are sandwiched between these two.

In comparison to word processors, desktop publishing systems are one step ahead because they give the user much more control over what will appear on the printed page and because they have specialized hardware and software, like page-makeup software, that aims to create a document that looks like the output.

Words and images are created in final pages through a process called desktop publishing (DTP).

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Distance from edge is  4.678m

We know from Shell law

nsini = n2 sinr

1 × 1.6/(1.6² + 1²)[tex]1^{1/2}[/tex]  = 1.33 × p/p² + 3.9²)[tex]1^{1/2}[/tex]

P² = 0.3838p² + 0.3838(3.9)²

P = 3.078m

Distance from edge = 1.6 + 3.078 = 4.678m

the difference between two positions in terms of size or magnitude. Keep in mind that the distance traveled between two spots and the distance between them are two different things. The total length of the journey taken between two points is known as the distance traveled. Distance covered Distance, which is measured along the actual path that connects two points, is a scalar quantity. A vector measure of displacement is the distance between two points as measured along the shortest path between them.

In what direction does the Earth move in a year? Although the Earth's orbit is fairly large (the radius is close to one trillion meters), the displacement is very small (in some respects, zero). When a year has passed,

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When the light bends around the strand of hair was of thickness 30.3*10^-6 m or 30.3 μm then beam of light faced diffraction.

Diffraction refers to what happens to a wave when it hits an obstacle. The key to understanding diffraction is a very simple observation first due to Huygens in 1678. Say a wave arrives at an opaque screen with a little hole in it.

The key point is that the receiver does not care about whatever happened on the other side of the screen. All that matters at is what the wave was like as it passed through the hole.

The great thing about this way of thinking about diffraction is that, since the wave equation is linear, you can use this trick for any number of holes. You simply add the amplitude for the waves produced from a “source” at each hole.

The condition for minimum in single slit diffraction is,

sinФ=mλ/d

Here, mis order, λ is the wavelength of light, d is slit width.

For first order minimum put m = 1

sinФmin=(1) (632.8*10m)/d

The width of the central maximum is,

2y=5.22×102 m

y=2.61×102 m

The expression for the distance between central maximum to the first minimum is, y= L tanФ

tan Ф= y L

Here, is the angle of diffraction of light which will produce first minimum.

tan Ф=2.61×10-2 m 1.25 m

tan Ф=1.196° which is very small.

Thus, for small angles tan 6, = sine

tanФ=sinФ

(sin 1.196°)= (1)(632.8*10 m) d

d=30.3*10^-6 m or 30.3 μm

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No, the quantity of kinetic friction on a moving item is not affected by its speed.

The consistency of the speed is more crucial than the actual speed. As was mentioned the friction force needs to be cancelled out by a constant force. The applied force would be equal to the kinetic friction force if the motion was constant in speed.

Therefore, the kinetic friction coefficient is not affected by the relative speeds of the two objects. The types of surfaces in contact are the sole factors that affect the coefficient of kinetic friction.

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When a dielectric slab is placed between a parallel-plate capacitor energy stored in it will decrease.

The parallel plate capacitor is a device that uses two parallel plates connected across a battery to create an electric field between them. Before the dielectric breaks down, a parallel plate capacitor can only hold a certain amount of energy. Draw a parallel plate capacitor and a slab with dielectric constant K between this capacitor. In capacitors, the energy stored is given by the formula U = 1/2 CV² where C is the capacitance and V is the potential difference. From this formula, we can tell that U is directly proportional to V. When V decreases, U also decreases. This is because dielectric reduces the electric field between the plates and decreases the energy stored in the field. Therefore, the option is 2) decreases.

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In space, there is no air to carry sound waves. Sound waves are vibrations that travel through a medium, such as air, water, or solid objects. Without a medium to carry the vibrations, sound cannot be transmitted. This is why astronauts in space cannot hear one another or any other sounds. They must use radios or other communication devices to communicate with one another.

Answer:

Below

Explanation:

Unless they have an electronic intercom in their spacesuits. there is no air between them to conduct the soundwaves.

The force on each charge will be 16N. Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/4 meter separation.

We have the following given data,

When, r=1m,F=1N

When, r=1/4m,F=?N

Solution,

Let, the distance is r.

The magnitude of the electric force between two charges is given by the following equation:

F=k.q1.q2/r2

the charges unchanged . this proportionality relation, let find the magnitude of force at  indicated distance.

Plugging in our values, we have

F=k.q1.q2/r2

F∝1/r2

F2/F1=r21/r22

F2=(r1/r2)2×F1

[Plug in the values. ]

F2=(4)

2×1 N

F2=16N

Therefore, the force will be

F2=16N

Other charges exert forces on electric charges; for instance, two positive charges may push apart or repel one another. To clarify, we say that an electric charge creates (or induces) an electric field all around it. Other adjacent charges are then affected by this electric field, applying forces to them.

In the same manner as F = mg determines the force on the mass m, F = qE determines the force on the charge. The analogy between gravity and electrostatics can be extended to include energy, but we'll get to that later.

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Answer:

Balanced forces will cause no change in the car's motion.

Explanation:

Balanced forces are 2 forces that are equal in opposite directions. This means they 'cancel each other out' in a way. Since both are equal, they cause no effect on the motion of the car

Climate changes will primarily hurt poor people in warm places, but climate changes are primarily being caused by wealthier people in colder places.

Most climate scientists agree that the root cause of the current trend in global warming is the anthropogenic expansion of greenhouse gases as the atmosphere traps heat radiating from the Earth into space. I agree. Certain gases in the atmosphere prevent heat from escaping.

The production of electricity and heat from burning fossil fuels accounts for the majority of global emissions. Most electricity is still produced by burning coal, oil, or gas. Carbon dioxide and nitrous oxide are powerful greenhouse gases that coat the earth and trap the sun's heat. As a result, the amount of carbon dioxide in the atmosphere is increasing rapidly.

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Newton's Law of acceleration best describes why this occurs.

Newton's second law - the law of acceleration (acceleration = pressure/mass). Newton's 2d regulation states that the acceleration of an item is without delay related to the net pressure and inversely associated with its mass. Acceleration of an object relies upon on  things, force and mass.

The legal guidelines are: (1) each item movements in a straight line except acted upon by way of a pressure. (2) The acceleration of an item is without delay proportional to the internet pressure exerted and inversely proportional to the object's mass. (3) For every motion, there may be an same and opposite reaction.

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The vibration of electric field is shifting towards +y direction as time passes. Hence, we can say that the electromagnetic wave is traveling in +y direction.

An electric field that oscillates in both space and time, coupled with an orthogonal magnetic field that has the same periodicity in both space and time, make up electromagnetic wave known as light. Maxwell originally explained this.

Light interacts with the charged particles found inside the atoms of a material as it enters them. Even while both magnetic and electric fields can be absorbed by materials, the interaction of the field of light with matter is, on average, 105 times larger than that of the magnetic field, thus, to a first approximation, we can limit our attention to the electric field's interaction with matter. when the light's electric field enters a substance and causes the electrons to migrate.

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The molar heating value in normal pressure is 116.49 J/molK or the molar heating value under continuous volume is 124.42 J/molK, according to the declaration.

Small units known as atoms, molecules, and ions make up all matter. These little particles vibrate back and forth or run into each other constantly. All is among a type of energy termed as heat (or thermal) energy, which is produced by the movement of particles.

Internal energy change:

Q = 84.0 J, V = 90 cm³ = 9.0E-5 m³, V' = 144.0 cm³ = 1.44E-4 m³, P = 1 atm

W = P(V'-V) = (1.013E5)(1.44E-4 - 9.0E-5) = 5.61 J

U = Q-W = 84.0-5.61 = 78.39 J

a). Molar specific heat

Q = nCp(T' - T) = (Cp/R) nR(T' - T) = (Cp/R) P(V' - V)

so Cp = RQ/[P(V' - V)] = 8.31*84.0 / 5.61 = 124.42 J/molK

b). Molar specific heat (constant v)

Cv=Cp - R = 124.8-8.31 = 116.49 J/molK

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The rope's force on the car, in terms of magnitude, is [tex]8.3 *10^{3}[/tex] N

A man ties a rope firmly around the front bumper of his car and an 18-meter utility pole in an effort to free it from the mud. Then, with a force of 550 n, he pushes sideways on the rope at its middle, shifting the rope's center by 0.30 m, but the automobile scarcely moves.

At first, we evaluate the angle, then with its help of it, we shall evaluate the magnitude of the force.

Measured from the dotted line, the angle of each rope half is

θ = [tex]tan^{-1} (\frac{0.30m}{9.0m} )= 1.9[/tex]

When we examine the forces at the "kink" (where F is applied), we discover

t = 2sinθ/F = 2sin1.9/550 = [tex]8.3 *10^{3}[/tex] N

The rope's force on the car, in terms of magnitude, is [tex]8.3 *10^{3}[/tex] N

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The magnitude of the force on the car from the rope is 8.3*10³ N

Force is the amount of energy applied to displace the position of any object. This force has magnitude and direction and so is called the vector quantity.

Here, in this question,

Given,

Distance = 18 m

Midpoint force = 550 N

Displacement of the center of the rope = 0.30 m

The rope when tied then it will also show a force which is the tension force (t).

We know that tension t

t = 2sinθ / F

But we are not aware about the value of θ

so

we will first find the value of θ by

θ = tan⁻¹(0.30/0.9) = 1.9

We got the angle to be 1.9, now we can easily find the force in the rope as

t = 2 sin 1.9 / 550

 = 8.3 * 10³ N

Therefore, the magnitude of the force on the car from the rope is 8.3*10³ N.

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Simple harmonic motion with a period of 0.100 s is carried out by a 240 g block that is fastened to a horizontal spring.the spring's force constant is 947.4 N/m, and the motion's amplitude is 0.00211 m.

Let:

m=240g,T=0.100s,E=1.00J

ω=2π/T

 =2π/0.1=62.83 rad/s

(a) k=mω²=(0.240kg)(62.83 rad/s)²=947.4 N/m

(b) E=kA²/2

A=√(2E/k)=√(2*1.0 J/947.4 N/m)

A=0.00211m

Simple harmonic motion is the repetitive movement back and forth through an equilibrium, or central, position in physics where the maximum displacement on one side of the position is equal to the maximum displacement on the other. Each entire vibration has a constant duration between them. The motion is always caused by a force that is directly proportionate to the distance from the equilibrium position and is always directed toward it. In other words, the equation F = kx, where F is the force, x is the displacement, and k is a constant The relationship is known as Hooke's law.

The oscillation of a mass attached to a vertical spring with the other end fixed in a ceiling is one particular instance of a simple harmonic oscillator.

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The magnitude of the force that the truck exerts on the car is same as the horizontal force exerted by the car on the truck that is 1600 N.

In physics, a force is a force that can change the motion of an object. A force can change the velocity of an object with mass. Pressure can also be intuitively described as pushing or pulling. A force has both a value and a displacement, making it a vector quantity.

Squeeze is pushing and pulling, which affects daily life because people without strength cannot open and close objects, lift arms and legs.

Reason :

This question is a simple application of Newton's third law, which states that if an object A exerts a force on an object B, then B must exert a force on A that is equal in magnitude but opposite in direction.

The car pushes against the ground with a force of 1600 N, so therefore the ground must exert a force on the car, also of 1600 N.

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The formula for the EMF induced in the wire as it grows is: EMF = -πG(Do2 + 2DoGt + (Gt)2)/4

The EMF induced in the wire is given by Faraday's law of induction, which states that EMF induced in a circuit is equal to the negative rate of change of magnetic flux through the circuit. Therefore, the EMF induced in the wire can be expressed as:

EMF = -dΦ/dt

where Φ is the magnetic flux through the wire loop. Since the magnetic flux through the wire loop is proportional to the area of the wire loop, we can express this as:

EMF = -d(πD2/4)/dt

Substituting in the expression for D(t), we get:

EMF = -πG(Do + Gt)2/4

Therefore, the formula for the EMF induced in the wire as it grows is:

EMF = -πG(Do2 + 2DoGt + (Gt)2)/4

b. The resistance of the wire is given by Ohm's law as:

R = ρL/A

where ρ is the resistivity of the wire, L is the length of the wire, and A is the cross-sectional area of the wire. Since the wire is a loop, the length is equal to the circumference of the loop, and the cross-sectional area is equal to the area of the wire loop. Therefore, the resistance can be expressed as:

R = ρ(πD/To)/(πD2/4)

Substituting in the expression for D(t), we get:

R = ρTo/(π(Do + Gt)2/4)

The current in the wire is given by Ohm's law as:

I = V/R

where V is the voltage across the wire. Since the voltage across the wire is equal to the EMF induced in the wire, we can substitute the expression for the EMF in the equation above to get:

I = (πG(Do2 + 2DoGt + (Gt)2)/4)/(ρTo/(π(Do + Gt)2/4))

Therefore, the formula for the current in the wire as a function of time is:

I = (Do2 + 2DoGt + (Gt)2)/(Toρ)

c. The graph of I(t) would be a parabola that is increasing as t increases. The graph will start at I(0) = Do2/(Toρ) and will rise as t increases. The rate of increase will depend on the value of G; the higher the value of G, the faster the current increases. The graph will reach a maximum value at t = (Do/G) and will then decrease as t continues to increase. The maximum value of the current is given by I = (Do2 + 2Do2/G + (Do/G)2)/(Toρ). Beyond t = (Do/G), the graph will decrease, eventually reaching I(∞) = 0.

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Assumptions scientists make include:

a nature can be understood through systematic study.

All scientists make essential assumptions. One is determinism—the idea that every one events inside the universe, such as conduct, are lawful or orderly. the second one assumption is this lawfulness is discoverable.

Technological know-how operates on the assumptions that herbal reasons give an explanation for herbal phenomena, that evidence from the herbal world can inform us approximately the ones causes, and that these reasons are constant.

A hypothesis is an assumption, an concept this is proposed for the sake of argument so that it may be examined to look if it might be authentic. in the medical technique, the speculation is constructed earlier than any applicable research has been done, other than a fundamental historical past overview.

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On the runway, aeroplanes accelerate between 115 and 160 mph (ca. 257 km/h). However, the precise acceleration is influenced by the plane's model, the weather, and other elements.

Seat belts will definitely feel under strain, and loose objects will become displaced. Considerable, sudden changes in height, attitude, and typically, large variations in indicated airspeed are all symptoms of severe turbulence. There's a chance the jet will briefly lose control.

Therefore, In general, tiny planes need the least amount of acceleration to take off, whereas commercial planes need the greatest.

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The weight of the ball bearing measured in milligrams is an example of Quantitative data .

What is Quantitative Data ?

The Quantitative data is defined as the value of data in form of counts or numbers where each data set has unique numerical value .

Examples of Quantitative data are :  

(1) Measurement of physical objects

(2) Counting the number of people in the class .

So , we can say that ,

Since the the weight of the ball bearing measured in milligram is a numerical quantity , it will be a quantitative data .

Therefore , the correct option is (d) .

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For the nine gallons of water, the correct answer is Selective combination.

Selective combination occurs when one synthesizes different information together.

Selective comparison occurs when one creates a connection between experiences and knowledge.

Selective encoding occurs when one selectively picks only relevant information.

Selective combination happens when one synthesizes one-of-a-kind records collectively. Selective contrast takes place while one creates a connection among reports and knowledge. Selective encoding occurs whilst one selectively selections only applicable information.

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Lateral Lines - Protect the attack line from minor flare-ups.

Hose Packs - Get the next length to the appropriate location.

Anchor Points - The starting location for any progressive hose lay.

Hose clamps - Restrict water flow.

Hoseline tees -Addition of lateral lines.

A common variation of Flat Road is the Minuteman Road. Some ingenuity is required for loading, but loading is easier than 3-layer stacking. This load is popular because when the tube enters the structure it can be peeled off and deployed from the shoulders of the jet man.

The high flow usually straight jet main jet is created with a smooth bore tip or some type of combination nozzle. Separate the front-row players from the back-row players. One team should focus on attacking the flames directly, while the other team should concentrate on blocking the oncoming spread of the flames.

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Answer:

When you turn on a cell phone, chemical energy from the battery is converted into electrical energy, which powers the various components of the phone. This electrical energy can be converted into other forms of energy, such as heat or light, depending on how the phone is being used.