How far will the driver be behind the vehicle in front at 30mph ? Give your answer to 2 significant figures

Answer:

0.1 KM/S

Explanation:

First, looking at the question we can say a few things: distance = speed/time. First we will change the 72 KM/HR to ? KM/S (seconds). To change the units fo the speed to seconds, we need to find how many seconds are in an hour which is 3600) then we have 72 KM/3600S and we will divide 3600 by 5 to get 720 which is what we will divide 3600 by to get to 5 seconds and what we will divide 72 by to get your speed in kilometers for your answer. 3600/720 = 5 seconds, and 72/720 is equal to 0.1. To format your answer, you would get 0.1 KM/S (kilometers/seconds)

If your teacher won't accept that answer or you want to change the unit of measurement for speed, you can also find out how many feet/miles a kilometer is and then multiply 0.1 times that value and then you'd have ? ft/s or mi/s.

To find the minimum initial speed of the dart so that the combination makes a complete circular loop after the collision, we can use the conservation of energy principle.

First, let's find the total mass of the system after the collision, which is the sum of the masses of the lead sphere and the steel dart:
m = 25.00 kg + 7.00 kg = 32.00 kg

Next, we need to find the height that the system needs to reach in order to make a complete circular loop. This height is equal to the length of the wire:
h = 3.50 m

Now, we can use the conservation of energy principle to find the minimum initial speed of the dart.

The initial kinetic energy of the system is equal to the final potential energy of the system at the top of the loop:
0.5 * m * v^2 = m * g * h

Solving for v, we get:
v = sqrt(2 * g * h)

Plugging in the values for m, g, and h, we get:
v = sqrt(2 * 9.81 m/s^2 * 3.50 m) = 8.30 m/s

Therefore, the minimum initial speed of the dart so that the combination makes a complete circular loop after the collision is 8.30 m/s.

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The image tubes in television sets and computer displays. Until recently, the picture tube was the most versatile of them, capable of displaying numbers, characters, graphs, and both still and moving images.

CRT stands for cathode-ray tube. The television image tube, which is used in household television receivers, is the most recognizable and ubiquitous type of cathode-ray tube.

LCD TVs first came in the early 2000s as the newer, superior TV with current technology. Nonetheless, tube Televisions were the most popular at the time. Because it was just 15 years ago, many of these TVs are still in use. We'll go into why you should replace your tube TV and the benefits of doing so further down.

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The correct answer in that the Radio waves have a longer wavelength than microwaves.

Radio waves have a wavelength range of about 1 millimeter to 100 kilometers, while microwaves have a wavelength range of about 1 millimeter to 1 meter. This means that radio waves have a longer wavelength than microwaves in general. Wavelength is related to the frequency of the electromagnetic wave by the equation: λ = c / f, where λ is the wavelength, c is the speed of light, and f is the frequency. Since the speed of light is constant, a longer wavelength corresponds to a lower frequency and vice versa. Radio waves are commonly used for communication and broadcasting, while microwaves are used for a variety of applications including cooking food, radar, and wireless communication. Understanding the properties of different electromagnetic waves, including their wavelength and frequency, is important for many areas of science and technology.

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Answer:

B

Explanation:

The moon effects the Earth's tides more than the sun.

The correct statement for the formation of tides on Earth is "The Moon has the greatest effect on tides since it is closer to Earth than the Sun."

Tides are caused by the gravitational pull of the Moon and Sun on Earth's oceans.

While the Sun has a greater mass than the Moon, the Moon is much closer to Earth and therefore has a greater effect on the tides.

The Moon's gravitational pull causes the oceans to bulge towards it, creating high tides on the side of Earth closest to the Moon and on the opposite side of Earth.

As Earth rotates, different areas experience high and low tides. The Sun also has an effect on the tides, but it is less significant than the Moon's effect.

In conclusion, the statement "The Moon has the greatest effect on tides since it is closer to Earth than the Sun" is true for the formation of tides on Earth.

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A modern large wind turbine can generate about 250 kw of electricity, whereas a large nuclear power plant can generate 1,000 mw so, 4000 wind turbines would be required to give the same output as one nuclear power plant.

To know how many wind turbines would be required to give the same output as one nuclear power plant is a simple mathematical calculation that involves only the conversion of kilowatts to megawatts.

Wind turbine and Nuclear power plant electricity generation in modern large wind turbine with moderate winds is 250 KW whereas, the generation capacity of large nuclear power plant is 1,000 MW.

To determine how many wind turbines would be required to give the same output as one nuclear power plant, we need to convert kilowatts to megawatts.

Since 1 MW = 1,000 kW, therefore 1,000 MW = 1,000,000 kW

We are given that a modern large wind turbine can generate about 250 kW of electricity

Therefore, the number of wind turbines required to give the same output as one nuclear power plant can be calculated as:

Number of wind turbines = Total capacity of nuclear power plant / Capacity of single wind turbine

                                         = 1,000,000 / 250= 4000

Thus, 4,000 wind turbines would be required to give the same output as one nuclear power plant.

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I don't know sorry didn't make me want you say you didn't know how I feel about me being that way and that I didn't even want you say I was wrong and you didn't want me to be to have a good time

Overall, the difference between detached and semi-detached binary systems lies in the extent to which the stars interact with each other and exchange mass.

In a detached binary system, the two stars are far enough apart from each other that they do not significantly interact with each other. The stars have their own gravitational fields, which cause them to orbit around the common center of mass, but they do not exchange significant amounts of mass or significantly alter each other's evolution. Detached binary systems are the most common type of binary systems.

In contrast, in a semi-detached binary system, one of the stars is closer to the common center of mass than the other and is therefore more strongly affected by the gravitational pull of the other star. The closer star can transfer mass to the more distant star, often through an accretion disk, causing the more distant star to become more massive and the closer star to become less massive over time. Semi-detached binary systems can lead to various phenomena such as accretion disks, mass transfer, and outbursts of energy.

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The correct option is (b). Photons of blue light have more energy than photons of green light. So, if there is a current in a photoelectric-effect apparatus with green light, then there will also be a current with blue light.

The photoelectric effect is the process where a material emits electrons when light is shone on it. The effect is generally associated with the emission of electrons when a metal surface is illuminated. In other words, the photoelectric effect refers to the emission of electrons from a metal when it is illuminated with light.

The energy of each photon is directly proportional to its frequency. Therefore, the photoelectric effect depends on the frequency of the incident light. If the frequency of the light is high enough, electrons can escape the surface of the metal. However, the number of electrons emitted is proportional to the intensity of the light, not its frequency.

Therefore, in this case, the cathode is illuminated with blue light. As photons of blue light have more energy than photons of green light, there will also be a current with blue light.

Thus, a current will necessarily be detected if the cathode is illuminated with blue light since photons of blue light have more energy than photons of green light.

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If you were in a rocket ship traveling away from earth at a speed close to the speed of light, then the changes that you would notice in the clock and the volume of your friend who stayed on earth are time dilation and volume dilation.

Time dilation: According to special relativity theory, time dilation occurs as an object's velocity approaches the speed of light. The faster an object travels, the slower its internal clock ticks. Time would seem to pass more slowly for you than it would for your friend on earth. The time on the rocket would appear to be slower than the time on the earth, and the rocket's clock would tick more slowly as seen from the earth.

Volume dilation: Volume dilation is a term used to describe a length contraction or expansion of an object along the direction of motion. According to the Lorentz transformation, as the velocity of an object approaches the speed of light, its length appears to shrink in the direction of motion.

This would result in the volume of the object appearing to decrease in size as well. Your friend on earth would notice that your rocket ship appears to be shorter than it really is, and its volume would appear to be less.

Therefore, time dilation and volume dilation are the two factors that would be noticed.

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a) The kinetic energy of the dart after it is thrown is 2.376 J.

b) The speed of the dart is 18.45 m/s.

c) If the dart were thrown straight upwards, the maximum height it would reach is 17.0 m.

a) The work done on the dart by the applied force is given by:

work = force x distance = 4.40 N x 0.54 m = 2.376 J

Since no energy is lost due to friction, all of this work is converted to the kinetic energy of the dart:

kinetic energy = work = 2.376 J

b) The kinetic energy of the dart can also be expressed as:

kinetic energy = (1/2) x mass x velocity^2

Rearranging this equation gives:

velocity^2 = (2 x kinetic energy) / mass

Substituting the values from part a) gives:

velocity^2 = (2 x 2.376 J) / 0.028 kg = 340.29 m^2/s^2

Taking the square root of both sides gives:

velocity = 18.45 m/s

c) When the dart is thrown straight upwards, its initial vertical velocity is zero. The maximum height it will reach can be calculated using the formula:

maximum height = (initial velocity^2) / (2 x acceleration)

where acceleration is the acceleration due to gravity, which is approximately 9.81 m/s^2.

Substituting the speed calculated in part b) gives:

maximum height = (18.45 m/s)^2 / (2 x 9.81 m/s^2) = 17.0 m

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According to the question, The pressure that the weight lifter's feet now exert on the floor is approximately 431200 Pa.

The amount of matter in an entity or particle is represented by the dimensionless number mass (symbolized m). The kilogram is the International System's (SI) preferred measure of mass. (kg).

The weight lifter's weight calculated as:

Weight = mass x gravity

Weight lifter's weight = 140 kg x 9.8 m/s^2 = 1372 N

The weight of the mass the weight lifter picks up is:

Weight of the mass = mass x gravity = 300 kg x 9.8 m/s^2 = 2940 N

Therefore, the total weight exerted by the weight lifter and the mass is:

Total weight = Weight lifter's weight + Weight of the mass = 1372 N + 2940 N = 4312 N

The pressure exert on the floor can be calculated as:

Pressure = Force / Area

Assuming the weight lifter's weight is distributed equally on both feet and each foot has an area of approximately 50 cm^2,

the pressure on each foot calculated as:

Pressure on each foot = Total weight / (2 x Area of each foot)

Pressure on each foot = 4312 N / (2 x 50 cm^2 x 0.0001 m^2/cm^2) = 4312 N / 0.01 m^2 = 431200 Pa

Therefore, the pressure that the weight lifter's feet now exert on the floor is approximately 431200 Pa.

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The power consumed by the resistor when it is connected to a 12.5 V battery is 4.41 W and the voltage of the battery is 13.41 V which provides 5 W power to the resistor.

We can use the formula for the power consumption of a resistor:

[tex]P = V^2/R[/tex]

where P is power, V is voltage, and R is resistance.

a. To determine the power consumption of the resistor when attached to a 12.6 V battery, we can use the same formula and solve for P:

[tex]P = V^2/R = (12.6 V)^2 / R[/tex]

However, R is not given in the problem. But we can use the power and voltage values given when the resistor was connected to a 1.5 V battery to find R:

[tex]P = V^2/R[/tex]

[tex]0.0625 W = (1.5 V)^2 / R[/tex]

[tex]R = (1.5 V)^2 / 0.0625\ W[/tex]

[tex]R = 36 \ \Omega[/tex]

Now we can use this value of R to find the power consumption when the resistor is connected to a 12.6 V battery:

[tex]P = V^2/R = (12.6 V)^2 / 36 \ ohms[/tex]

P = 4.41 W

Therefore, the power consumption of the resistor when attached to a 12.6 V battery is approximately 4.41 W.

b. To find the voltage of the battery that consumes 5.00 W, we can use the same formula and solve for V:

[tex]P = (V^2) / R[/tex]

[tex]5.00 W = (V^2) / R[/tex]

We know the value of R from before, so we can substitute it in:

[tex]5.00 W = (V^2) / 36 \ ohms[/tex]

Solving for V, we get:

[tex]V = \sqrt{5.00 W \times 36 \ ohms} = 13.41 V[/tex]

Therefore, the voltage of the battery that consumes 5.00 W is approximately 13.41 V.

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The amount of information available, the length of time available to examine it, and consequently the complexity of weather occurrences limit one's ability to express their skill to predict the weather.

Models employ estimations and assumptions to forecast the weather because it is impossible to collect data from the future. These estimations from the models get less accurate as time goes on since the atmosphere is continually changing.

Probabilistic techniques accurately depict the uncertainty where deterministic plans provide exact average quantities with a known but unquantified uncertainty.

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The number of electrons in 1 nenocoulomb (1 nc) charge is 6.24*109. It takes 6 10 18 electrons to produce one coulomb of charge.

The smallest elemental component of an atom, the electron has a negative charge. In some kind of a negative ion, there are an adequate amounts of electrons as well as protons. One electron but one proton are all that the hydrogen atom has.

The negatively charged components of an atom are called electrons. The total negative charge of an atom's electrons counteracts the positive electrical charge of its protons there in atomic nucleus. When compared to all the other components of the atom, electrons are quite tiny.

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Answer:

Let the mass of the ball be m, and let v be the velocity of the ball before it is caught. Let the final velocity of the person and ball be 0 after the catch. We can write the following equation:

(m)(v) + (78 kg)(3 m/s) = (m + 78 kg)(0 m/s)

Simplifying this equation, we get:

(m)(v) = -234 kg m/s

We also know that the initial velocity of the ball is 34 m/s, so we can write another equation using this information:

(m)(34 m/s) = (m)(v)

Substituting the first equation into the second equation, we get:

(m)(34 m/s) = -234 kg m/s

Solving for m, we get:

m = -234 kg m/s / (34 m/s) = -6.88235 kg

This is a negative mass, which doesn't make sense. We made an error in our calculations, possibly due to significant figures. Let's try again with more precision:

(m)(34.0 m/s) = -234 kg m/s

m = -234 kg m/s / 34.0 m/s = 6.88235 kg

Rounding to the appropriate number of significant figures, we get:

m ≈ 6.9 kg

Therefore, the ball would need to have a mass of approximately 6.9 kg in order to stop a 78 kg person moving at 3 m/s when they catch it.

Explanation:

Answer:

the bottom

Explanation:

A medium is the substance through which a wave travels. Mediums include gases (such as air), liquids (such as water), and solids (such as ropes).

The medium can be solid, liquid, or gas, and the speed of the wave is determined by the material qualities of the medium. Light, on the other hand, is not a mechanical wave; it may pass through a vacuum, such as the empty areas of space.

Sound waves move the slowest through gases, the fastest through liquids, and the fastest through solids among the three media (gas, liquid, and solid). The speed of sound is also affected by temperature. Gases: The speed of sound is determined by the qualities of the medium through which it travels.

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The time required for the container to move 2.25 metres down the ramp is roughly 0.104 seconds.

From part (f), we have determined the final velocity of the package to be 1.38 m/s. Using this value along with the distance traveled (Δx = 2.25 m), we can calculate the time elapsed using the kinematic equation:

Δx = (vf² - vi²) / 2a

Substituting the values, we get:

2.25 = (1.38² - 0) / (2 * 0.087)

Solving for time (t), we get:

t = 2.25 * 0.087 / 1.897

t ≈ 0.104 seconds

Therefore, the time elapsed when the package travels a distance of 2.25 m down the ramp is approximately 0.104 seconds.

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The correct answer is option: e. Because, this force always acts along  line joining the two charges. For like charges, the force is repulsive in nature.

The Coulomb's law states how charges interact with each other. That law states that: [tex]F =q1q24πϵ0r2[/tex]

If the charges are like , the force will be repulsive, meaning that each charge will exert a force on the other to push the two of them apart. If  charges are opposite , they will exert an attractive force on each other. G or unlike charges, the force is attractive as shown below: ( as Shown in image attached  to question), As we know none of the arrow moves in the direction of the net force. Hence, the correct answer is option: e

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The X component of the tiger's velocity is 53.59 km/h.

The vertical (Y) component of the tiger's velocity is 12.37 km/h.

The components of the tiger's velocity include X and Y components; the magnitudes of the X and Y components is calculated using the following formula.

The X component of the tiger's velocity is calculated as;

Vx = V cosθ

where;

Vx = 55 km/h  x  cos (13)

Vx = 53.59 km/h

The vertical (Y) component of the tiger's velocity is calculated as;

Vy = V sinθ

Vy = 55 km/h  x sin (13)

Vy = 12.37 km/h

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If the pressure in the pipe is 8940 n/m and in the constricted section is 6705 n/m ,the rate at which oil is flowing is approximately 0.029 m^3/s.

We can use the principle of continuity of flow to relate the flow rate of the oil in the pipe to the difference in pressure and the area of the pipe at the constriction:

Q = Av

where Q is the flow rate, A is the area of the pipe at the constriction, and v is the velocity of the oil at the constriction.

We can use Bernoulli's equation to relate the pressure difference to the velocity of the oil at the constriction:

P1 + (1/2)ρv1^2 = P2 + (1/2)ρv2^2

where P1 and P2 are the pressures at the two points, and v1 and v2 are the velocities of the oil at those points.

Since the pipe is horizontal, the height difference between the two points can be neglected and we can assume that the gravitational potential energy of the oil is constant. Therefore, we can simplify Bernoulli's equation to:

P1 + (1/2)ρv1^2 = P2 + (1/2)ρv2^2

Solving for v2, we get:

v2 = sqrt((P1 - P2) / (1/2ρ) + v1^2)

Now we can substitute this expression for v2 into the continuity equation:

Q = Av1 = A sqrt((P1 - P2) / (1/2ρ) + v1^2)

Solving for Q, we get:

Q = A v1 sqrt(2(P1 - P2)/ρ(A^2 - a^2))

where A is the area of the larger section of the pipe and a is the area of the constriction.

Substituting the given values, we get:

Q = (pi/4)(0.567 m)^2 (v1) sqrt(2((8940 N/m^2) - (6705 N/m^2))/(821 kg/m^3)((0.567 m)^2 - (0.045 m)^2))

Q ≈ 0.029 m^3/s

Therefore, the rate at which oil is flowing is approximately 0.029 m^3/s.

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The Young's modulus for a 3D crystal can be estimated using the group velocity equation for 1D crystals by making the following assumptions:

The equation for Young's modulus in a 3D crystal is then: E = ρ v2, where ρ is the mass density and v is the group velocity.

The group velocity can be estimated using the group velocity equation for 1D crystals: v = (dω/dK)-1. Here, ω is the angular frequency and K is the wave vector.

By combining these two equations, the Young's modulus for a 3D crystal can be estimated using the group velocity equation for 1D crystals.

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The correct answer is D. I, II, and III. All three of the variables listed can be affected if a dielectric is inserted into a parallel plate capacitor.

When a dielectric is inserted into a parallel plate capacitor, the capacitance increases. This is because the dielectric reduces the electric field between the plates, which in turn reduces the potential difference between the plates. This allows for more charge to be stored on the plates for a given potential difference, resulting in an increase in capacitance. The electric field between the plates is also affected when a dielectric is inserted into a parallel plate capacitor. The dielectric reduces the electric field between the plates by reducing the potential difference between the plates.

Finally, the electric potential is also affected when a dielectric is inserted into a parallel plate capacitor. The potential difference between the plates is reduced when a dielectric is inserted, which in turn reduces the electric potential. Therefore, all three of the variables listed - capacitance, electric field, and electric potential - are affected when a dielectric is inserted into a parallel plate capacitor.

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Therefore, the coefficient of kinetic friction is approximately 0.136

the acceleration of the first crate with friction down the ramp.

We'll use the following formula:

a = gsin(theta) - mucos(theta)*g

whereg = acceleration due to gravity = 9.8 m/[tex]s^2[/tex]

theta = angle of the ramp = 25 degrees

mu = coefficient of kinetic friction

Plugging in the values, we get:

a = 9.8sin(25) - mucos(25)9.8

a = 3.9763 - 3.5299mu

Plugging in the values, we get:

[tex]v^2=[/tex] 0 + 2*(3.9763 - 3.5299*mu)6

[tex]v^2[/tex] = 47.715 - 42.1794mu

the velocity of the second crate without friction at the bottom of the ramp. We know it's 2.5 times the velocity of the first crate with friction, so:v' = 2.5sqrt(47.715 - 42.1794mu)

no friction for the second crate, we can use the conservation of energy to relate the initial potential energy to the final kinetic energy:

mg6sin(25) = 0.5m*[tex]v^2[/tex]

where

g = acceleration due to gravity = 9.8 m/

Simplifying and plugging in the value for v', we get:

mg6sin(25) = 0.5m*)(47.715 - 42.1794mu)

3.5299 = 11.885 - 10.545*mu

mu = 0.136

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The polarizing axis of the second pane of the window make with the polarizing axis of the first pane of the window in order to reduce the intensity of the sunlight to 34% of the original value is [tex]23^o[/tex].

The intensity of the sunlight falling from the first pane

[tex]I_1 = \frac{I_o}{2}[/tex]

Once this intensity light passes through the second pane then

[tex]I_2 = I_1 \cos^2 \thetaI_2 = \frac{I_o}{2} \cos^2 \theta[/tex]

Given I2 /Io = 0.42  (42%) so

[tex]0.42 = \frac{1}{2} \cos^2 \theta\\[/tex]

[tex]\cos^2 \theta = 0.84[/tex]

[tex]\cos \theta = \sqrt{0.84} = 0.9165\\[/tex]

[tex]\theta = \cos^{-1} ( 0.9165) = 23.6^o[/tex]

The polarizing axis, also known as the polarization direction, is the direction of the electric field oscillation of an electromagnetic wave. When light passes through a polarizing filter, only the component of the electric field parallel to the polarizing axis is allowed to pass through, while the perpendicular component is blocked.

For example, a linear polarizing filter has a polarizing axis that allows only light waves oscillating in a specific direction to pass through. If the electric field oscillation of the light is perpendicular to the polarizing axis, it will be blocked, resulting in a darker image. In contrast, circular polarizers have a rotating polarizing axis that can selectively block light waves based on their direction of rotation. This is useful in photography and other applications where glare or reflections need to be minimized.

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The pneumatic system is connected to a gripper or clamp that is holding the box of chalk or book, then the plunger's action would cause the gripper or clamp to release the object, allowing it to move.

When you press the plunger on a pneumatic system, such as a pneumatic cylinder, air is forced into the cylinder, causing the piston inside to move outward. If you are using the pneumatic system to move a box of chalk or a book, the outward movement of the piston would cause the attached object to move in the same direction.

However, the movement of the object would also depend on the design and placement of the pneumatic system. For example, if the pneumatic system is connected to a gripper or clamp that is holding the box of chalk or book, then the plunger's action would cause the gripper or clamp to release the object, allowing it to move.

It's also worth noting that the amount of force exerted by the pneumatic system would depend on the pressure and flow of the compressed air, as well as the size and design of the cylinder and piston.

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This implies that when the force applied on an item increases, so does the object's acceleration. Similar to how an object's acceleration decreases as its mass increases, so does its mass.

Force with acceleration are directly correlated, as shown by Newton's second law. The more force that is exerted to an object, the faster it will accelerate. For instance, the acceleration doubles when the force exerted on an object doubles.

The relationship among acceleration and force is explained in Newton's second laws of motion. They are comparable in size. An object moves forward at a speed equal to the force pushing against it. The simplest approach to determine force is to multiply mass by acceleration.

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To cause the 10 g particle that moves to the left at 28 m/s to move to the right at 48 m/s, the net work that must be done is 7.6 J.

The unit of the net work is Joule (J).

We know that the formula for kinetic energy is given by:

KE=1/2mv^2

where KE is Kinetic energy,

m is the mass of the particle,

v is the velocity of the particle

When a particle changes its direction, its velocity changes from positive to negative.

In this case, the velocity of the 10 g particle changes from -28 m/s to 48 m/s.

We want to find the net work done on the particle. Since no external force acts on the particle, we know that the net work done on the particle is equal to the change in the kinetic energy of the particle.

The initial velocity of the particle is -28 m/s and its mass is 10 g = 0.01 kg.

Therefore, the initial kinetic energy of the particle is

KEi=1/2 * 0.01 * 28^2

    =3.92 J

The final velocity of the particle is 48 m/s.

Therefore, the final kinetic energy of the particle is

KEf =1/2 * 0.01 * 48^2

    =11.52 J

The change in the kinetic energy of the particle is therefore,

ΔKE = KEf - KEi

      =11.52 - 3.92

        =7.6 J

This is the net work done on the particle to cause it to move to the right at 48 m/s.

Therefore, the net work that must be done on the particle is 7.6 J. This is the final answer.

However, we need to express the answer in the appropriate unit which is Joule.

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Answer:

d. 4 m/s²

Explanation:

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