Please help I need to make sure my answer is correct

The mass of the counterweight required to balance the 90-kg load is also 90 kg.

To balance the 90-kg load, the moment created by the counterweight s must equal the moment created by the load. The moment created by a force is equal to the force multiplied by the perpendicular distance from the force to the point of rotation. In this case, the point of rotation is the fulcrum and the perpendicular distance is the distance between the fulcrum and the force.

Let's assume that the distance between the fulcrum and the load is d, and the distance between the fulcrum and the counterweight is x. We can then write the equation:

mass of counterweight x distance to fulcrum = mass of load x distance to fulcrum

m_s x x = 90 kg x d

We are given that x = 450 mm (0.45 m). Solving for m_s, we get:

m_s = (90 kg x d) / x

We need to determine the value of d in order to calculate the mass of the counterweight. Since the system is in balance, we know that the sum of the moments created by the load and the counterweight must be zero. That is:

mass of load x distance to fulcrum = mass of counterweight x distance to fulcrum

90 kg x d = m_s x (x + d)

Substituting the expression we derived earlier for m_s, we get:

90 kg x d = [(90 kg x d) / x] x (x + d)

Simplifying this expression by cancelling out the factor of d on both sides, we get:

90 kg = (90 kg / x) x (x + d)

Multiplying both sides by x, we get:

90 kg x = 90 kg x (x + d)

Cancelling out the factor of 90 kg, we get:

x = x + d

Solving for d, we get:

d = x = 450 mm = 0.45 m

Now we can use the equation we derived earlier for m_s to calculate the mass of the counterweight:

m_s = (90 kg x 0.45 m) / 0.45 m = 90 kg.

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The distance the object falls is equal to the height of the building, which is 90 x 3.85 = 346.5 meters.

The acceleration due to gravity can be found using the equation:

d = 1/2 * g * t^2

where d is the distance the object falls, t is the time of fall, and g is the acceleration due to gravity.

Substituting the known values:

346.5 meters = 1/2 * g * (8.50 seconds)^2

Solving for g:

g = 2 * 346.5 meters / (8.50 seconds)^2

g = 9.74 m/s^2

So the acceleration due to gravity on the planet is 9.74 m/s^2.

The impact speed of the object can be found using the equation:

v = g * t

where v is the impact speed and t is the time of fall.

Substituting the known values:

v = 9.74 m/s^2 * 8.50 seconds

v = 82.8 m/s

So, the impact speed of the object is 82.8 m/s.

Sabrina is probably taking the Big Five Personality Test.

The Beck Depression Inventory, Millon Clinical Multiaxial Inventory-III, Minnesota Multiphasic Personality Assessment, and Child Behavior Checklist are some of the frequently used objective personality tests.

Examples of objective personality assessments include the Big Five Personality Inventory, the Millon Clinical Multiaxial Inventory (MCMI), and the Minnesota Multiphasic Personality Inventory (MMPI).

The Minnesota Multi-Phasic Personality Inventory (MMPI), which rates people on personality, psychological, and emotional factors, is arguably the most popular of the objective personality tests.

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a. The graph does not appear to be symmetrical.

b. The graph appears to be bimodal, as there are two distinct peaks.

c. The data appear to be positively skewed, as the tail of the graph extends further to the right than to the left.

d. There appear to be outliers for values less than 3.5 and greater than 6.75, as these values are relatively far away from the rest of the data and do not fit the overall pattern of the graph.

A graph is described as a structure amounting to a set of objects in which some pairs of the objects are in some sense "related.

Graphs are a popular tool for graphically illuminating data relationships.

In conclusion,  A graph serves the purpose of presenting data that are either too numerous or complex to be properly described in the text while taking up less room.

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B) The relationship between revolutions per second AND average time should be an inverse relationship: (as one increases the other decreases) is incorrect.

This is incorrect because, as the length of the string increases, the average time for 10 revolutions should increase as well. This is because the bobber has to travel farther as the string gets longer, and so it takes longer to finish 10 revolutions. Therefore, the relationship between revolutions per second and average time is not inverse; instead, it is a direct relationship. As the length of the string increases, the average revolutions per second should increase, and the average time should decrease. This means that the relationship between the two is actually a direct relationship  as one increases, the other increases as well.

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Answer:

130.43g

Explanation:

First, we need to calculate the heat lost by the tea when it cools down from 33.3°C to 31.8°C. We can use the formula Q = mcΔT, where Q is the heat lost, m is the mass of the tea, c is the specific heat capacity of water, and ΔT is the change in temperature.

The mass of the tea is given as 187g and the specific heat capacity of water is 4186 J/kg·°C. The change in temperature is (33.3 - 31.8)°C = 1.5°C.

So, the heat lost by the tea is: Q = (187g) * (4186 J/kg·°C) * (1.5°C) = 1174.05 J

This heat is gained by the ice, causing it to melt and warm up to 0°C. The heat required to melt ice is given by Q = mL, where m is the mass of ice melted and L is the latent heat of fusion of water.

The latent heat of fusion of water is 334 kJ/kg. So, we can calculate the mass of ice melted as: m = Q / L = (1174.05 J) / (334 kJ/kg) = 0.0035 kg = 3.5g

However, not all of the ice will melt. Some of it will remain as ice and some will become water at 0°C.

Let’s say that x grams of ice melts completely and becomes water at 0°C. The remaining (133 - x) grams of ice will stay as ice.

The heat required to melt x grams of ice is: Q1 = x * L

The heat required to warm up x grams of water from 0°C to 31.8°C is: Q2 = x * c * (31.8 - 0)

The total heat gained by the ice and water is: Q = Q1 + Q2

Substituting the values we get: 1174.05 J = x * L + x * c * (31.8 - 0)

Solving for x, we get: x = 1174.05 J / (L + c * (31.8 - 0)) = 2.57g

Therefore, out of the initial 133g of ice, only 2.57g melts completely and becomes water at 0°C.

The remaining mass of ice in the jar is: 133g - 2.57g = 130.43g

So, at the time at which the temperature of the tea is 31.8°C, there are approximately 130.43g of ice remaining in the jar.

The formula for the force required to stop the automobile is F = m x a, where m = 1200 kg and F = 1200 x (-12.5) N = - 15000 N.

As a car brakes, the rotating wheels create friction inside the wheel assemblies, bringing the vehicle to a stop. The kinetic energy of the automobile is lost as heat in the braking components due to this friction force, which slows the spinning of the wheels.

The automobile can come to a stop with any force higher than zero. The only difference is that it will take longer and cover a bigger distance before stopping.

Unless a force acts on a body, it stays at rest or moves in a straight path at a constant speed.

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The mechanical energy of the bird is 26.4 J.

To determine the mechanical energy of the bird, we need to calculate its kinetic energy and potential energy.

Kinetic energy = 1/2 * mass * velocity^2

Potential energy = mass * gravity * height

Given:

Mass = 0.2 kg

Velocity = 12 m/s

Height = unknown

Gravity = 12 m/s^2

Kinetic energy = 1/2 * 0.2 * 12^2 = 14.4 J

To find the potential energy, we need to know the height. Let's assume it is 5 meters.

Potential energy = 0.2 * 12 * 5 = 12 J

Mechanical energy = kinetic energy + potential energy

Mechanical energy = 14.4 + 12 = 26.4 J

Therefore, the mechanical energy of the bird is 26.4 J.

A.

Gravitational potential energy = mass * gravity * height

GPE = 20 * 9.81 * 2 = 392.4 J

The work done to lift the object is equal to its gravitational potential energy, so the GPF (Gravitational Potential Force) is 392.4 N.

B.

Total mass of boxes = 60 * 6 = 360 kg

Gravitational potential energy = mass * gravity * height

GPE = 360 * 9.81 * 2 = 7069.2 J

The work done to lift the boxes is equal to their gravitational potential energy, so the GPF is 7069.2 N.

Therefore, the GPF for the 20 kg lift is 392.4 N and the GPF for the 60 boxes is 7069.2 N.

A.

Kinetic energy = 1/2 * mass * velocity^2

KE = 1/2 * 0.003 * 40^2 = 2.4 J

Therefore, the kinetic energy of the 3 g bullet travelling at 40 m/s is 2.4 J.

B.

We can calculate the average velocity of the car using the formula:

Average velocity = distance / time

Average velocity = 60 / 3 = 20 m/s

Kinetic energy = 1/2 * mass * velocity^2

KE = 1/2 * 1200 * 20^2 = 240,000 J

Therefore, the kinetic energy of the car is 240,000 J.

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Answer:

Explanation:

since weight and force both are forces we can simply use the equation

                            F=ma

here ,

  m=mass=9.00kg

  a=acceleration=6.00m/s^2

             So,

                  F=W=54N

The direction of the north pole of a compass needle represents the direction of magnetic field lines. Magnetic field lines originate from the north pole of magnet and terminate at south pole. Hence, the correct compass will be A.

A plotting compass is also known as a magnetic compass. It aligns itself with the magnetic field of magnet, with north-seeking end of the compass pointing towards the south pole of the magnet and the south-seeking end pointing towards the north pole of the magnet.

So, to determine which plotting compass is pointing in the correct direction, you would need to observe the direction in which the north-seeking end of the compass is pointing and compare it to the direction in which the south pole of the bar magnet is located. If the north-seeking end of the compass is pointing towards the south pole of the magnet, then the compass is pointing in the correct direction.

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Tycho Brahe was the scientist who came to the conclusion that the cosmos was "Earth Centered" after failing to notice any seasonal variations in the background star "stellar parallax."

An Earth-centered perspective of the cosmos. Claudius Ptolemy believed that the Earth was at the centre of the universe. Before the controversial findings of Copernicus, Galileo, and Newton, this belief persisted for 1400 years.

Around 380 B.C., a scientist by the name of Eudoxus developed the first geocentric universe model. The stars, the sun, and the moon are all incorporated into the sequence of cosmic spheres that make up Eudoxus' universe model.

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Answer:

Explanation:

The vertex of an absolute function is the minimum or the maximum point of the graph

The graph that could be  is (a) an absolute value graph has a vertex at (2, 1)

The function is given as:

And the coordinates of the vertex (h,k) are said to be positive.

From the list of given options, only the first option has both coordinates of the vertex to be positive i.e. (2,1)

Hence, the graph that could be  is (a)

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At its highest temperature, a space heater has a resistance of 17.5 Ω when it is plugged into a wall outlet that supplies a peak voltage of 176.8 V sinusoidally at 60 Hz . the average power output of the space heater is 888 watts.

The average power output of the space heater can be calculated using the root mean square (RMS) values of the voltage and current. The RMS voltage and current are related to the peak voltage and the resistance of the space heater as follows:

V_RMS = V_peak / sqrt(2)

I_RMS = V_RMS / R

where V_RMS is the RMS voltage, I_RMS is the RMS current, V_peak is the peak voltage, and R is the resistance of the space heater.

Substituting the given values, we get:

V_RMS = 176.8 V / sqrt(2) = 124.8 V

I_RMS = 124.8 V / 17.5 Ω = 7.12 A

The average power output of the space heater is given by:

P_avg = V_RMS * I_RMS * cos(θ)

where cos(θ) is the power factor, which we will assume to be 1 for a resistive load like the space heater.

Substituting the values for V_RMS and I_RMS, we get:

P_avg = 124.8 V * 7.12 A * 1 = 888 W.

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The TV's efficiency rating is 5.56%.

An isolated system has a constant total energy. Energy cannot be generated or destroyed; it can only be transformed from one form to another or transferred between systems. When all energy sources are considered, the overall energy of an isolated system is constant.

Efficiency is equal to (useful energy output/total energy intake) multiplied by 100%.

Useful energy output = light energy output + sound energy output

= 10 kJ + 30 kJ

= 40 kJ

Total energy input = electrical energy input

= 720 kJ

Substituting these values into the efficiency formula, we get:

Efficiency = (40 kJ / 720 kJ) x 100%

= 0.0556 x 100%

= 5.56%

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Answer:

To calculate the total force on Earth due to Venus, Jupiter, and Saturn, we need to use the formula for gravitational force: F = G * (m1 * m2) / r^2 where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between them. First, we need to convert the distances to meters: dV = 108 million km * 1000 m/km = 1.08 x 10^11 m dJ = 150 million km * 1000 m/km = 1.5 x 10^11 m dSat = 778 million km * 1000 m/km = 7.78 x 10^11 m Next, we can calculate the forces due to each planet: FV =

Answer:

a. Spalling

(9) None of the options listed in the question are correct as a risk assessment approach to environmental hazards.

(10) House debt is not a direct effect of housing on health (option D)

A risk assessment approach to environmental hazards aims to take into account all of the following factors, including the health outcome, inherent danger, quantity of exposure, and route of exposure. Therefore, none of the options listed in the question are correct as all of them should be considered in a risk assessment approach to environmental hazards.

10. While housing affordability and financial stress related to housing can indirectly affect health, they are not a direct effect of housing itself on health.

The other options are direct effects of housing on health:

A. Proximity to services and facilities, such as healthcare, education, and transportation, can affect health outcomes.

B. Materials effects of housing, such as ventilation, insulation, and building materials, can directly affect indoor air quality and physical health.

C. Insecure housing, such as homelessness or living in overcrowded or unsafe conditions, can lead to physical and mental health problems.

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Answer:

the volume of the material is 0.0145 m^3 and its density is 20690.3 kg/m^3.

Explanation:

To solve the problem, we can use Archimedes' principle, which states that the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.

Let's first find the weight of the unknown material in air:

W_air = 300 N

Next, let's find the weight of the unknown material in alcohol:

W_alcohol = 200 N

We can find the buoyant force acting on the material by subtracting the weight in alcohol from the weight in air:

F_buoyant = W_air - W_alcohol = 300 N - 200 N = 100 N

According to Archimedes' principle, this buoyant force is equal to the weight of the alcohol displaced by the material:

F_buoyant = ρ_alcohol * V * g

where ρ_alcohol is the density of the alcohol, V is the volume of the material, and g is the acceleration due to gravity.

Substituting the values we know:

100 N = 700 kg/m^3 * V * 9.81 m/s^2

Solving for V:

V = 0.0145 m^3

Finally, we can find the density of the material by dividing its weight in air by its volume:

ρ_material = W_air / V = 300 N / 0.0145 m^3 = 20690.3 kg/m^3

Therefore, the volume of the material is 0.0145 m^3 and its density is 20690.3 kg/m^3.

Based on the given fundamental frequency of 7 Hz, it is likely that the harmonic is a multiple of the fundamental frequency.

Harmonics are integer multiples of the fundamental frequency and can be calculated using the formula: f(n) = n * f(1), where f(n) is the frequency of the nth harmonic, and f(1) is the frequency of the fundamental harmonic.

Therefore, the frequency at which this harmonic is created will depend on the harmonic number. For example, the second harmonic would have a frequency of 14 Hz (2 * 7 Hz), the third harmonic would have a frequency of 21 Hz (3 * 7 Hz), and so on. Without knowing the harmonic number, it is not possible to determine the frequency at which this harmonic is created.

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Answer:

B. Frequency

Explanation:

Frequency is measured in the unit Hertz (Hz).

Light waves will be refracted, or bent, as they move from air to the denser medium of water.

When a beam of light enters a swimming pool, it will cause light waves to bend and refract when they pass from the less dense medium of air to the denser medium of water.

This is due to the different densities of the two mediums, which causes the light waves to bend as they move from one to the other. As a result, the light waves become distorted and spread out, causing a blurry and distorted image.

This phenomenon is known as refraction, and it happens when light passes through any medium that is denser than the one it is coming from. It's why we can see objects underwater, as the light waves get bent and refracted as they pass through the water. Refraction is an important part of many optical phenomena, such as lenses and prisms, which use it to bend and shape light.

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We can infer that item A is not composed of the same material as object B since its specific heat capacity is higher than object B's. As the specific heat capacities differ, we cannot assume that they are the same.

The amount of heat needed to increase the warmth of one unit of mass of a substance by one degrees Celsius must be compared between two things in order to ascertain if they are made of the same material. The compounds are probably the same if the heat capacity capacities are the same. The following equation can be used to determine how much heat energy is needed to raise an object's temperature:

Q = mcΔT

Where Q is the heat received or released, m is the object's mass, c is the material's specific heat capacity, and T is the temperature change.

Let's figure out how much heat energy is needed to raise item A's temperature by one degree Celsius:

Q A = mcΔT

Q A equals 6 kg x 2,310 J/(kg°C) x 1°C.

Q A = 13,860 J/°C

Let's now determine how much heat energy is needed to raise item B's temperature by 1 degree Centigrade:

Q B = mcΔT

Q B is equal to 4.6 kg, 1,771 J/(kg°C), and 1°C.

Q B = 8,146.6 J/°C

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The required escape velocity from the asteroid in km/s and mph is 2.0 km/s and 4478 mph, respectively.

According to analyses of orbital statistics, asteroids of 10 km in size can strike the planet every 100 My or so, which is consistent with the theory that we were struck by an object of this size 65 My ago.

Part A: Escape velocity is the bare minimum speed at which an object can break out of an astronomical body's gravitational influence. The following provides the escape velocity formula:

v = √((2GM)/r)

Where, G = gravitational constant M = mass of the astronomical body r = radius of the astronomical body

Now, let's substitute the given values to find the escape velocity from the asteroid.

Given, Diameter of the asteroid, d = 10 km

So, radius of the asteroid, r = d/2 = 5 km = 5 × 10³ m

Density of the asteroid, ρ = 3000 kg/m³

Mass of the asteroid, M = ρ × volume of the asteroid= ρ × (4/3)πr³= 3000 × (4/3) × π × (5 × 10³)³= 6.54 × 10¹¹ kg

Gravitational constant, G = 6.67 × 10⁻¹¹ Nm²/kg²

Putting all these values in the escape velocity formula, v = √((2GM)/r)= √((2 × 6.67 × 10⁻¹¹ × 6.54 × 10¹¹)/5 × 10³)= 2.0 km/s

Therefore, the escape velocity from the asteroid is 2.0 km/s.

Part B : Now, let's convert the escape velocity from km/s to mph.1 km = 0.621371192 milesSo, v in mph = 2.0 km/s × (0.621371192 miles/km) × (3600 s/hour)= 4478 mph

Therefore, the escape velocity from the asteroid is 4478 mph (rounded to three significant figures).

Hence, the required escape velocity from the asteroid in km/s and mph is 2.0 km/s and 4478 mph, respectively.

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Question:

You are standing on the surface of a spherical asteroid 10 km in diameter, of density 3000 kg/m3.

Part A

Calculate the escape velocity from the asteroid in km/s.

Express your answer in kilometers per second using two significant figures.

Calculate the escape velocity from the asteroid in mph.

Express your answer in miles per hour using three significant figures

For solving this problem,we have to apply Newton’s law of gravitation which defines the magnitude of the force between two objects.

Gravitational Force -

[tex]\:\:\:\:\:\:\:\sf \underline{\boxed{\sf{F=G\times \dfrac{ \: m_1 \: m_2}{r^2}}}}[/tex]

Where:-

As per question, we are given -

Now that required values are given, so we can substitute the values into the formula and solve for Force of gravity:-

[tex] \:\:\:\:\:\:\:\longrightarrow \sf Force_{(gravity) }= 6.7\times 10^{-11} \times \dfrac{3.5\times 6.4\times 10^{23}}{(5.6\times 10^{10})^2}\\[/tex]

[tex] \:\:\:\:\:\:\:\longrightarrow \sf Force_{(gravity) }=6.7\times 10^{-11} \times \dfrac{1400.46}{23172.08}\\[/tex]

[tex] \:\:\:\:\:\:\:\longrightarrow \sf Force_{(gravity) }=6.7\times 10^{-11} \times 0.06\\[/tex]

[tex] \:\:\:\:\:\:\:\longrightarrow \sf \underline{Force_{(gravity) } = 4.02\times 10^{-12}\:N}\\[/tex]

elevator of mass 550 kg and a counter weight of 700 kg lifts 23 tired 80-kg students to the 7th floor of a dormitory 30 meters off the ground in 12 seconds. then the power required to lift the 23 students to the 7th floor is 41,948.85 W or 56.22 hp.

To solve this problem, we need to use the formula for power, which is:

Power = Work/Time

We can find the work done by the elevator by using the formula:

Work = Force x Distance

The force required to lift the elevator and the counterweight is:

Force = (mass of elevator + mass of counterweight + mass of students) x g

where g is the acceleration due to gravity, which is approximately 9.81 m/s².

So the force required is:

Force = (550 + 700 + 23 x 80) x 9.81

= 16,779.54 N

The distance traveled by the elevator is 30 meters, so the work done by the elevator is:

Work = Force x Distance

= 16,779.54 x 30

= 503,386.2 J

Now, we can calculate the power required:

Power = Work/Time

= 503,386.2/12

= 41,948.85 W

To convert watts to horsepower, we can use the conversion factor 1 hp = 746 W. Therefore, the power required is:

Power = 41,948.85/746

= 56.22 hp

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Since [1 + 2] = [1] + [2], the Velocity of the constant 1 and 2 must be the same. Therefore, both constants have the same SI units.

V is the velocity, d is the distance, and t is the duration in the equation V = d/t. Calculate the object's acceleration by dividing its mass by its force, then multiplying the result by the acceleration's duration.

(b) The units of the constants 1 and 2 must be the same because [12 / 12] = 1. As a result, the SI units for both variables are the same.

(c) The units of the constant 2 must be the same as the units of the constant 1 squared because [2] = [2] / [1]. As a result, the SI units for the constants 1 and 2 differ.

(d) The constant 2 must have radians as its units because the cosine function's input must be dimensionless. It is necessary for the constant 1 to have units that enable the cosine function's units to cancel out. This can be done by assigning the constant 1 units that are reciprocal radians, or radians to the power of -1. As a result, the SI units for the constants 1 and 2 are rad-1 and radians, respectively.

Due to the fact that [(2 / 1) - (2)2] equals [(2 / 1)], The units of the constant 2 must match those of the constant 1 cubed, or [22]. As a result, the SI units for the constants 1 and 2 differ.

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the correct answer is A. The force would be one-fourth the original force.

According to Coulomb's law, the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

The mathematical expression for Coulomb's law is:

F = k * q1 * q2 / [tex]r^2[/tex]

where F is the force, k is the Coulomb constant, q1 and q2 are the charges of the particles, and r is the distance between them.

In this case, the force is given as -0.5 N, which means that the charges must be of opposite signs. Let's assume that the charged sphere has a positive charge, so the test particle must have a negative charge. The distance between them is initially 1 meter.

Plugging in the given values into Coulomb's law, we get:

-0.5 N = k * q_sphere * q_particle / [tex](1 m)^2[/tex]

where q_sphere is the charge of the sphere and q_particle is the charge of the test particle.

If we double the distance between the particles to 2 meters, then the new force can be calculated using the same equation:

F' = k * q_sphere * q_particle / ([tex]2 m)^2[/tex]

To determine how the new force F' relates to the original force F, we can take the ratio of the two equations:

F' / F = (k * q_sphere * q_particle / [tex](2 m)^2\\[/tex]) / (k * q_sphere * q_particle / (1 [tex]m)^2[/tex])

= (1/4)

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Answer: A

Explanation: the correct answer is A, The force would be one-fourth the original force.

False. Because metaethics is concerned with the nature of ethics and moral reasoning.

Metaethics is concerned with the nature of ethics and moral reasoning, while normative ethics is concerned with specific ethical principles and the best course of action in particular ethical issues.

Disagreement on metaethics does not necessarily mean that two people will disagree on the best outcome of a particular ethical issue such as abortion. It is possible for two people with different metaethical views to agree on the best course of action in a particular ethical issue, as long as they share similar normative ethical principles or have similar views on the relevant facts of the situation.

However, differences in metaethics may lead to differences in how one arrives at their normative ethical principles, which may in turn affect their view on the best outcome of a particular ethical issue.

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