A refrigerator uses the natural refrigerant carbon dioxide where the compressor brings 0.02 kg/s from 1 MPa, -20°C to 6 MPa using 2 kW of power. Find the compressor exit temperature.

The choice on oil paint that is not used to describe its luminosity is b) stained.

On oil paint, these are used to describe its luminosity:

Stained glass is not used to describe the luminosity of oil paint. Stained glass is made by painting or firing powdered glass onto a surface. Oil paint, on the other hand, is made by mixing pigment with a drying oil. The drying oil allows the pigment to be applied in layers and to build up to create a rich, luminous color.

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We do not have the value of yo, the initial vertical position of the squirrel (height of the tree limb), so we cannot calculate the exact height of the squirrel above the ground without that information.

What is Velocity?

Velocity is a vector quantity that describes the rate of change of an object's position with respect to time. It specifies both the speed and direction of an object's motion. Velocity is defined as the displacement of an object per unit of time, and it is typically denoted by the symbol "v"

We need to convert the horizontal distance from centimeters to meters and use consistent units in our calculations. Plugging in the given values:

x = 0.186 m

xo = 0 m

vox = 0.1 m/s

Using the horizontal motion equation, we can calculate the time of flight (t) of the nut:

0.186 = 0 + 0.1*t

t = 1.86 seconds

Now, we can use the vertical motion equation to calculate the height (y) of the squirrel:

y = yo + voyt - 0.5g*\(t^{2}\)

Since the squirrel loses its grip and has no initial vertical velocity (voy = 0), we have:

y = yo - 0.5g\(t^{2}\)

Plugging in the known values:

g = 9.8 m/\(s^{2}\)

t = 1.86 s

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Answer: Which of these statements is most likely correct about the stars?

Star 2 attracts Star 1 with a greater gravitational force than Star 1 attracts Star 2.

No, because Third Newton Law states that both forces are equal in magnitude.

Earth exerts almost equal gravitation force on both the stars.

No, because the Universal Gravitational Law, estblished by Newton, states the atraction force to two masses is proportional to the product of the masses.

Star 1 attracts Star 2 with a greater gravitational force than Star 2 attracts Star 1.

No (same reason for the first statement)

Earth exerts greater gravitation force on Star 2 than on Star 1.

Right. This is the correct statement. Given the mass of Star 2 is greater than the mass of Star 1, by the Universal Gravitational Law, the earth exerts greater gravitational attraction on Star 2.

Explanation:

:)

Answer:

P= 720 watt

Explanation:

P= IV

P= (6)(120)

P= 720 watt

Answer:

There are \(9.537\times 10^{-23}\) kilograms of radioactive material after 300 seconds.

Explanation:

From Physics we know that radioactive materials decay at exponential rate, whose differential equation is:

\(\frac{dm}{dt} = -\lambda\cdot m\) (1)

Where:

\(\frac{dm}{dt}\) - Rate of change of the mass of the radioactive material, measured in kilograms per second.

\(m\) - Current mass of the radioactive material, measured in kilograms.

\(\lambda\) - Decay constant, measured in \(\frac{1}{s}\).

The solution of the differential equation is:

\(m(t) = m_{o}\cdot e^{-\lambda\cdot t}\) (2)

Where:

\(m_{o}\) - Initial mass of the radioactive material, measured in kilograms.

\(t\) - Time, measured in seconds.

If we know that \(m_{o} = 20\,kg\), \(\lambda = 0.179\,\frac{1}{s}\) and \(t = 300\,s\), then the initial mass of the radioactive material is:

\(m(t) = (20\,kg)\cdot e^{-\left(0.179\,\frac{1}{s} \right)\cdot (300\,s)}\)

\(m(t) \approx 9.537\times 10^{-23}\,kg\)

There are \(9.537\times 10^{-23}\) kilograms of radioactive material after 300 seconds.

Answer:

The correct answer is 1) 19.

Answer:

work involves force and distance while power involves force an elocity

work involves energy and time while power involves force and mass

Answer:

i think it would be a but i am not 100% sure on that

To find the current in the resistor, we can use Ohm's Law and the concept of equivalent resistance. Thus, option A is correct.

First, let's calculate the equivalent resistance of the three cells connected in parallel. When resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances:

1/Req = 1/R1 + 1/R2 + 1/R3

Given that R1 = R2 = R3 = 22 Ω (internal resistance of each cell), we can substitute the values:

1/Req = 1/22 + 1/22 + 1/22

1/Req = 3/22

Taking the reciprocal of both sides, we find:

Req = 22/3 Ω

Now we can use Ohm's Law to calculate the current (I) in the resistor. Ohm's Law states that the current flowing through a resistor is equal to the voltage across it divided by its resistance:

I = V/R

Given that V = 1.1 V (emf of each cell) and R = 32 Ω (resistance), we can substitute the values:

I = 1.1/32

Calculating this value, we find:

I ≈ 0.034375 A

Therefore, the current in the resistor is approximately 0.034375 A.

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The correct answer is B. At the bottom of the Ferris wheel, the person's apparent weight is at its maximum.

How to find apparent weight?

The apparent weight of a person on a Ferris wheel is due to the combination of two forces acting on them: the gravitational force and the centrifugal force. As the Ferris wheel rotates, the direction and magnitude of the centrifugal force change, causing the apparent weight of the person to vary.

At the top of the Ferris wheel, the person's apparent weight is at its minimum because the centrifugal force is directed downwards, opposing the gravitational force. At the bottom of the Ferris wheel, the person's apparent weight is at its maximum because the centrifugal force is directed upwards, adding to the gravitational force.

Halfway up, going down, the person's apparent weight is less than their true weight, but more than it is at the top because the centrifugal force is still directed downwards, but its magnitude is decreasing. Similarly, halfway up, going up, the person's apparent weight is less than their true weight, but more than it is at the bottom because the centrifugal force is still directed upwards, but its magnitude is decreasing.

Therefore, the correct answer is B. At the bottom of the Ferris wheel, the person's apparent weight is at its maximum.

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Answer:

\(\vec{B}_{y}=6T\)

Explanation:

Here we can use the Lorentz force equation.

\(\vec{F}_{B}=q(\vec{v}\times \vec{B})\)

We know:

So we will have:

\( (0.4i-20j+12k)=2((2.0i+4.0j+6.0k) \times (ai+bj+ck))\)  

Let's solve the cross product, knowing that x component of B is 0, it means a=0.

\( (0.4i-20j+12k)=2((2.0i+4.0j+6.0k) \times (0i+bj+ck))\)  

\( (0.4i-20j+12k)=2((4c-6b)i-2cj+2bk)\)  

Comparing the k component we have:

\(12=2b \)

\(b=6 \)            

If we see b is the y-component of the magnetic field, therefore \(\vec{B}_{y}=6T\)

I hope it helps you!

-0.033 units

According to Lorentz force law, the magnetic force, F, on a moving charge, q, moving with a velocity, v, in a magnetic field, B, is given by;

F = q v x B   ----------------(i)

Where;

F, v and B are vectors. Therefore, equation (i) represents a vector product of the velocity and magnetic field vectors.

From the question;

v = (2.0i + 4.0j + 6.0k)m/s

F = (0.4i - 20j + 12k)N

q = 2.0C

Let the magnetic field vector be given by;

B = ai + bj + ck               ---------------------(*)

Where;

a, b and c are the magnitudes of the x, y and z components of the magnetic field.

Substitute the values of F, v, B and q into equation (i) as follows;

(0.4i - 20j + 12k) = 2.0(2.0i + 4.0j + 6.0k) x (ai + bj + ck)

Expanding the second bracket gives

(0.4i - 20j + 12k) = (4.0i + 8.0j + 12.0k) x (ai + bj + ck)          ---------------(ii)

Solving the right hand side of equation (ii) which is the vector product gives;

                                       |                                       |

                                       |  i               j                 k |

 (0.4i - 20j + 12k) =        |  4.0         8.0         12.0  |

                                      |  a             b                 c  |

                                      |                                        |

(0.4i - 20j + 12k)  = (8.0c - 12.0b)i - (4.0c -12.0a)j + (4.0b - 8.0a)k      ----(iii)

Comparing both sides of equation (iii) gives the following three equations;

0.4 = 8.0a - 12.0b           --------------------(iv)

-20 = 4.0c - 12.0a          ---------------------(v)

12 = 4.0b - 8.0a             ----------------------(vi)

From the question, it is given that the x component of the magnetic field is equal to zero. Now, recall that from equation (*) above, the magnitude of the x-component of the magnetic field is given as a

Therefore;

a = 0

To get the y component, which is b, substitute the value of a = 0 into equation (iv) as follows;

0.4 = 8.0(0) - 12.0b

0.4 = 0 - 12.0b

0.4 = - 12.0b

Solve for b;

b = \(\frac{-0.4}{12.0}\) = -0.033

Therefore the y component of the magnetic field is -0.033 units

Answer: rafting

Explanation:

this sport is called rafting because they go down a river with fast paced water and a blow up boat because they do it for a thrill like a water ride.

An astronomer reports they have measured the parallax angle of 10 arc seconds for a star. which is reasonable as "the smaller a star's parallax angle, the further away it is."

A parallax angle is the distance evaluated from a nearby star between both the Earth at one time year and the Earth six months after that.

Some key features regarding the parallax angle are-

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Methods to prevent Air pollution from Microwave oven are Ensure proper ventilation,Use microwave-safe containers,Clean the microwave regularly,Avoid burning food and Dispose of damaged microwave ovens responsibly.

To prevent air pollution from microwave ovens, there are several effective methods you can follow:

1. Ensure proper ventilation: Make sure your microwave oven is installed in a well-ventilated area. Good ventilation helps in preventing the accumulation of pollutants in the air.

2. Use microwave-safe containers: Always use microwave-safe containers to heat or cook food. Using inappropriate containers can release harmful chemicals or toxins into the air.

3. Clean the microwave regularly: Regularly clean the inside of your microwave oven to remove any food residue or spills that can generate smoke or unpleasant odors when heated.

4. Avoid burning food: Be cautious when heating or cooking food in the microwave to prevent burning. Burning food releases smoke and harmful particles that can contribute to air pollution.

5. Opt for alternative cooking methods: Instead of relying solely on the microwave, consider using other cooking methods like stovetops, ovens, or slow cookers. This diversification reduces the frequency of microwave oven use and thus decreases air pollution.

6. Dispose of damaged microwave ovens responsibly: If your microwave oven is damaged beyond repair, dispose of it responsibly at an authorized recycling center. Improper disposal can contribute to environmental pollution.

By implementing these preventive measures, you can minimize air pollution associated with microwave oven usage and contribute to a cleaner and healthier environment. Remember to prioritize safety and proper usage guidelines provided by the manufacturer.

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D. Water in the pot is heated by convection. Water molecules at the bottom of the pot warm up and rise while cooler water molecules sink to the bottom of the pot, creating convection currents.

Convection currents are flowing fluid that is moving because there is a temperature or density difference within the material.

Convection heat transfer takes place only in liquids and gases.

During heat transfer by convection, the heated air will rise to the top due o its lower density while the cooler air will sink to the bottom due to its higher density.

Thus, for the model of a pot of water being heated on a stove that shows thermal energy transfer, the heat transfer occurs when the water in the pot is heated by convection. Water molecules at the bottom of the pot warm up and rise while cooler water molecules sink to the bottom of the pot, creating convection currents.

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Heat is transferred to the water. The water molecules which are in the pot become more active, and the temperature of the water rises.

What is the Kinetic energy?

Kinetic energy is the energy of the objects which is present due to the motion of the object. Kinetic energy is proportional to the mass and velocity of the object. The SI unit of Kinetic energy is Joule (J).

The kinetic energy is possessed due to the motion of the particles. The kinetic energy is directly proportional to the temperature of objects. The kinetic energy of the particles increases with the rise in temperature of object or solution.

In the given situation, the pot of water is placed on the stove. Then, the heat is transferred to the water in pot. The water molecules will move faster with the rise in temperature of the water. The water molecules will have greater amount of kinetic energy due to increase in temperature.

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Scientists believe that a long time ago the seven continents might have been connected, but they think the plates shifted apart at some point.

The distance traveled by the box along the ramp is 0.51 m.

Apply the principle of conservation of energy;

Potential energy of the box at top of incline = Elastic potential energy at bottom

mgh = ¹/₂kx²

where;

h = L sinθ

where;

mg(L sinθ) = ¹/₂kx²

(18)(9.8)(L sin25) = ¹/₂(740)(0.32)²

74.55 L = 37.89

L = 37.89 / 74.55

L = 0.51 m

Thus, the distance traveled by the box along the ramp is 0.51 m.

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The smallest possible shaft AE is having the diameter equal to 22nm or 22 nanometer, which can be calculated by using the formula for the torque transmitted by the shaft.

The smallest permissible diameter of shaft AE can be determined using the formula for torque transmitted by a solid shaft:

T = (π/16) × τ × d³

where T is the torque transmitted by the shaft, τ is the maximum shear stress, and d is the diameter of the shaft.

Given that:

T = 45 kW / (2π × 500 rpm) = 0.143 Nm,

τ = 50 MPa, and

that 30 kW is taken off at gear G and 15 kW is taken off at gear H, we can calculate the torque transmitted by gears G and H as follows:

\(T_G\) = 30 kW / (2π × 500 rpm)

= 0.095 Nm

\(T_H\) = 15 kW / (2π × 500 rpm) = 0.048 Nm

The torque transmitted by shaft AE can be calculated as follows:

\(T_{AE}\) = T + \(T_{G}\) + \(T_{H}\) = 0.143 + 0.095 + 0.048 = 0.286 Nm

Substituting these values into the formula for torque transmitted by a solid shaft and solving for d, we get:

d = [(16 × T_AE) / (π × τ)]¹/³

= [(16 × 0.286) / (π × 50)]¹⁾³ ≈ 22 mm

Therefore, the smallest permissible diameter of shaft AE is approximately 22 mm.

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Imani is likely to be receiving Transcranial Magnetic Stimulation (TMS) treatment.

Magnetism is a physical quality mediated by a magnetic field that refers to the ability to create attracted and repulsive occurrences in other substances. Diamagnetic materials are those that magnetize freely when put in a magnetic field. However, the magnetization is oriented in the opposite direction as the magnetic field. These materials' magnetism is referred to as diamagnetism. Magnetism is a component of the broader phenomenon of electromagnetic. The most well-known effects occur in ferromagnetic materials, which are highly attracted by magnetic fields and may be magnetized to become permanent magnets, hence creating magnetic fields. It is also feasible to demagnetize a magnet.

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The size of the planets from smallest to largest is: Mercury, Mars, Venus, Earth, Neptune, Uranus, Saturn, and Jupiter.

The planets in our solar system range in size from the small, rocky Mercury, which has a diameter of 4,879 km, to the giant gas giant Jupiter, which has a diameter of 139,822 km. The order of the planets based on size is determined by their relative diameters, with the smallest planet, Mercury, being the first in the list and the largest planet, Jupiter, being the last.

The rocky planets, Mercury, Mars, Venus, and Earth, are all relatively close in size, with diameters ranging from 4,879 km to 12,742 km. The gas giants, Jupiter, Saturn, Uranus, and Neptune, are much larger, with diameters ranging from 49,244 km to 139,822 km.

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Answer:

a. Aim of the experiment: To identify the magnetic fields around the bar magnet.

b. After tapping the paper, the iron filings align themselves according to the lines of the magnetic force of bar magnet. The magnetic field is more concentrated at the ends of poles as most of the iron fillings are attracted at the poles and the pattern form by iron filling shows the magnetic field of the bar magnet.

c. If iron filings will be replaced with grit, there will be no magnetic movement around bar magnet as grit is not a metal and do not have any magnetic properties.

Explanation:

a) The experiment with paper, iron sprinkles and bar magnet was performed to show the presence of the magnetic field around the magnet.

o) In the experiment, when we placed two opposite poles and sprinkled the iron over, the iron filings were aligned between forces applied by the opposite poles that are they attract each other. When the same poles were placed facing each other, the iron sprinkles were arranged away from each other. This shows that opposite poles attract each other while the same poles repel each other.

c) If iron filings were replaced with the grit, the magnetic field will be stronger.

0.840s is the half-life of lithium-8 if the decay constant is 0.825/s. The decay constant is unique to each radioactive substance and measures the speed of radioactive decay. Therefore, the correct answer is option D.

The half-life of lithium-8 can be calculated using the formula:

\(t1/2 = ln(2) / \lambda\)

Where t1/2 is the half-life, ln is the natural logarithm, and λ is the decay constant. Substituting the given decay constant of 0.825/s into the formula:

t1/2 = ln(2) / 0.825/s

t1/2 ≈ 0.840s

Therefore, the half-life of lithium-8 is approximately 0.840s. The formula for half-life is a fundamental concept in nuclear physics, which determines the time required for a radioactive substance to decay by half of its original quantity. The decay constant, which is specific to each radioactive substance, measures the rate at which radioactive decay occurs.

The higher the decay constant, the shorter the half-life, indicating that the substance is more unstable and decays faster. In this case, the decay constant of lithium-8 is 0.825/s, indicating that it is relatively unstable and has a short half-life of approximately 0.840s.

In summary, the half-life of lithium-8 is approximately 0.840s with a decay constant of 0.825/s. Therefore, the correct answer is option D.

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a) Yes, Mercury would eventually be farther from the Sun than Earth.

Mercury is the smallest and closest planet to the Sun in our Solar System. It has a rocky, cratered surface and no atmosphere, and is one of four terrestrial planets. Mercury has an eccentric orbit and rotates slowly, completing one rotation approximately every 59 days. It is the second densest planet after Earth and is composed of a high percentage of iron, making it the most magnetic of all the planets. Mercury has no moons, and its temperature can range from about -173°C to 427°C. Its extreme temperatures are due to its proximity to the Sun, and the fact that it has no atmosphere to protect it from the Sun's radiation.

b) Without the Sun's gravity, Mercury would continue in a straight line away from the Sun at its initial velocity, which is determined by its orbital radius and the Sun's mass. Using the equations of motion, we can calculate that it would take Mercury 8.03 x 10^7 seconds (or 2.8 years) to be farther from the Sun than Earth.

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For a high-speed connection between two buildings, the type of wiring that should be used is fiber optic cable. Fiber optic cable is the most reliable and efficient way to transmit data over long distances at high speeds.

It uses light to transmit data instead of electrical signals, which means it is not affected by electromagnetic interference that can cause interruptions in transmission.
Fiber optic cable also has a much higher bandwidth than traditional copper wiring, which means it can handle more data at once. This is especially important for businesses that need to transfer large files or stream video across their network.
When installing fiber optic cable between two buildings, it is important to consider factors such as distance, the amount of data that will be transmitted, and the required level of security. A professional installer should be consulted to ensure that the cable is installed correctly and meets the specific needs of the business.
Overall, fiber optic cable is the best choice for a high-speed connection between two buildings due to its reliability, efficiency, and high bandwidth.

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The capacitance of the given capacitor is approximately 2.3 × 10^(-10) F. Therefore, the correct answer is A.

The capacitance of a parallel-plate capacitor can be calculated using the formula:

C = ε₀ * (A / d)

where C is the capacitance, ε₀ is the vacuum permittivity (approximately 8.85 × 10^(-12) F/m), A is the area of one plate, and d is the separation distance between the plates.

Given that the radius of each plate is 2.5 mm, we can calculate the area using the formula for the area of a circle:

A = π * r^2

where r is the radius.

Substituting the values into the formulas, we have:

A = π * (2.5 mm)^2 = π * (2.5 mm)^2 ≈ 19.63 mm²

Note: It's important to convert the units to meters before performing the calculations.

The separation distance between the plates is given as 0.75 mm, which is equal to 0.75 * 10^(-3) meters.

Now, we can calculate the capacitance:

C = ε₀ * (A / d) = (8.85 × 10^(-12) F/m) * (19.63 * 10^(-6) m² / 0.75 * 10^(-3) m)

C ≈ 2.3 × 10^(-10) F

Therefore, the capacitance of the given capacitor is approximately 2.3 × 10^(-10) F.

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Answer:

bro we cant do this

Explanation:

Answer:

The energy resource brought into a coal power plant is coal.

Found the answer at: https://www.tva.com/energy/our-power-system/coal/how-a-coal-plant-works#:~:text=Coal%2Dfired%20plants%20produce%20electricity,to%20start%20the%20process%20over.

The waste produced by coal power plants is coal ash and the energy produced by coal power plants is electricity.

Answers found at: http://www.groundtruthtrekking.org/Issues/AlaskaCoal/Coal-Ash-Combustion-Wastes.html       and        https://www.tva.com/energy/our-power-system/coal/how-a-coal-plant-works#:~:text=Coal%2Dfired%20plants%20produce%20electricity,to%20start%20the%20process%20over.

The two laws of thermodynamics apply to what I found out in my research because I know that the entropy increase due to the combustion of conventional fuels is much larger than that resulting from that of nuclear fuels, and is therefore much more dangerous. Also, I know that heat is used to burn coal and create energy.

Found answer at: https://www.encyclopedie-energie.org/en/energy-consumption-and-entropy-release-in-the-biosphere/

Explanation:

Hope this helps, i got an okay score on it but better than nothing i guess lol

Answer:

False

Explanation:

Neither the USGS nor any other scientists have ever predicted a major earthquake. USGS scientists can only calculate the probability that a significant earthquake will occur in a specific area within a certain number of years.

Thus the closest object that the woman should be able to see while looking through the upper part of the bifocal lens would be the object that lies between 25cm of the lens.

Bifocal spectacles are specs which are created of both convex and concave lens. The upper part is made up of the concave lens while the lower part consists of convex lens.

When looking through the upper part of the bifocal lens the objects at a little distance become clearer as the upper part of bifocal lens consists of diverging lens that is used to correct distant or vision at some distance.

There are two types of lens the converging or convex lens and the diverging lens or concave lens.

Convex lens is called the converging lens as a two parallel rays of light when passing through a convex lens get bent towards each other and converge at some point.

Concave lens is called the converging lens as two parallel rays on passing through the concave lens get diverged from each other.

The clearest image that is formed by a concave lens is when the object lies between the focal point and the lens, where the image is formed at the focal point on the image side of the lens.

Thus the closest object that she would be able to see is the object that she would be able to see clearly would be the object that lies between 25cm of the lens.

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It serves its purpose to state that charged materials contain differing levels of both protons and electrons. Transaction to take place have an imbalanced charge.

either more positive protons or electrons than electrons. Moreover, neutral objects have an equal quantity of protons and electrons, neutralizing overall charge.

Heated Entities as a Proton and Electron Imbalance. Transaction to take place have an imbalanced charge, either more positive protons or electrons than electrons. Additionally, neutral objects have an equal quantity of protons and electrons, neutralizing their charge.

The same principle that applies to atoms also pertains to objects. The total amount of charge on the object is determined by dividing his difference by 1.6 x 10 -19 Coulombs.

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The magnitude of the electric field required to suspend the charged object is approximately 49,000 N/C.

Given information,

Mass = 0.0245 kg

Charge = -4.9 μC

The gravitational force acting on the object can be calculated using the formula: F = m × g

The electric force exerted on the object can be calculated using the formula: F = q × E

Force must balance the gravitational force, so:

F_gravity = F_electric

m × g = q × E

E = (m × g) / q

E = (0.0245 kg × 9.8 m/s²) / (-4.9 x 10⁻⁶ C)

E ≈ -49,000 N/C

Therefore, the magnitude of the electric field required to suspend the charged object is approximately 49,000 N/C.

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