illustrate the difference between a neutral object, a positively charged object, and a negatively charged object

Answer:

it is my first time to login on brainly thats why i didnt answer your question

Answer:

K = C + 273, so 27°C = 27+273 = 300 K

1 dg = 100 mg, so 20 dg = 20×100 = 2,000 mg

Explanation:

Answer:

C. That the small portion of the space we can see is truly representative of all the rest of the universe that we cannot see.

Explanation:

The Cosmological Principle assumes that the small portion of the universe that we can see is representative of the entire universe, even though we can only directly observe a tiny fraction of it. It's an assumption used by Cosmologists to simplify their models of the universe.

Answer:

false

Explanation:

A vector quantity is the magnitude of a given quantity? True Or False

The magnitude and direction of the electric field is equal to 3.45 x10^13 N/m and the direction in towards the negative charge.

To calculate the electric field of a point it is necessary to use the following expression:

                                             \(E = k\frac{Q}{d^{2}}\)

Thus, calculating the field formed by each charge we have:

                                    \(E = 9 \times 10^{9} \times \frac{8}{36\times 0.0001}\)

                                      \(E = 2\times 10^{13} V/m\)

                                   \(E = 9 \times 10^{9} \times \frac{5.8}{36\times 0.0001}\)

                                    \(E = 1.45 \times 10^{13} N/m\)

The direction of the electric field of the negative charge is towards the charge (attracted) and of the positive charge is repelled.

So, we can add the two values ​​of field found, since the two are directed towards the negative charge, so that :

                                       \(E = 2 \times 10^{13} + 1.45 \times 10^{13}\)

                                       \(E = 3.45 \times 10^{13} N/m\)

So, the magnitude of eletric field is equal to 3.45 x10^13 N/m and the direction in towards the negative charge.

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bonjours

non il y a des métaux  type alu, argent, plomb qui ne reagissent pas au aimants

j espère que cela vous aura aidée

bonne fin de journée a vous

Answer:

The answer is "\(35.6^{\circ}\)"

Explanation:

The sunlight level of the first panel:

\(I_1 = \frac{I_o}{2}\)

When the light of this intensity passes through the second window:

\(I_2 = I_1 \cos^2 \theta\\\\I_2 = \frac{I_o}{2} \cos^2 \theta\)

 \(\frac{I_2}{I_o} = 0.33 (33\%) \\\\\)

therefore,  

\(0.33 = \frac{1}{2} \cos^2 \theta\\\\\cos^2 \theta = 0.66\\\\\cos \theta = \sqrt{0.66} = 0.8124\\\\\theta = \cos^{-1}( 0.8124) = 35.6^{\circ}\\\\\)

The quantities that can be compared from four cars is the average acceleration. Answer A.

The question isn't complete. A similar question is in the attachment. When a truck or a car increases its velocity over time, it means it experiences acceleration. The vehicle moves in a non-uniform motion. The formula in non-uniform motion

where

The information in the question  that four cars have a different time to travel but have the same

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Answer:

The temperature of the metal is  \(T_m = 376.8 ^o C\)

Explanation:

From the question we are told that

     The mass of the metal is  \(M = 60 \ kg\)

     The specific heat of the metal is  \(c_p = 0.1027 kcal/(kg \cdot ^oC)\)

       The mass of the oil is \(M_o = 810 \ kg\)

       The temperature of the oil is  \(T_o = 35^oC\)

       The specific heat of oil is  \(c_o = 0.7167 kcal/(kg \cdot ^oC )\)

       The equilibrium temperature is \(T_e = 39 ^oC\)

According to the law of energy conservation

     Heat lost by metal  =  heat gained by the oil

So  

   The quantity  of heat lost by the metal is mathematically represented as

               \(Q = - Mc_p \Delta T\)

=>            \(Q = -Mc_p (T_m - T_c)\)

Where \(T_ m\)  the temperature of metal before immersion

The negative sign show heat lost

The quantity  of gained t by the metal is mathematically represented as      

           \(Q = M_o c_o \Delta T\)

=>        \(Q = M_o c_o (T_c - T_o)\)

So  

         \(Mc_p (T_m - T_c) = M_o c_o (T_c - T_o)\)

substituting values

          \(- 60 * 0.1027 (T_m - 39) = 810 * 0.7167 * (39 - 35)\)

=>       \(T_m = 376.8 ^o C\)

Answer:

Below

Explanation:

If you can't overcome the force of friction....the crate will not move

so friction force = 145 N

Coeff of friction =  Ff / Normal force = 145 / (31.2 * 9.81) = .47

Answer:

1.67 m/s²

Explanation:

Total force is;

ΣF = F_f + F_a

From the free body diagram attached, we see that the frictional force F_f is acting in a negative direction.

Thus;

ΣF = -15 + 30

ΣF = 15 N

Now, to get the acceleration, we will use the formula;

ΣF = ma

We are given m = 9 kg

Thus;

15 = 9a

a = 15/9

a = 1.67 m/s²

Answer: Diffraction

Explanation: It is diffraction, because due to diffraction, sound waves bend on the corner as their size is of the order of wavelength of sound waves.

Answer:

Hi ??? what is your question

Answer:

t = 6 minutes

Explanation:

Given that,

Force,\(F=6.8\times 10^5\ N\)

Initial speed of the train, u = 0

Final speed of the train, v = 80 km/h = 22.22 m/s

The mass of the train, \(m=1.1\times 10^7\ kg\)

We need to find the time taken by the train to come to rest. We know that,

F = ma

\(F=\dfrac{m(v-u)}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{1.1\times10^7\times (22.22-0)}{6.8\times 10^5}\\\\t=359.44\ s\)

or

t = 6 minutes (approx)

So, the required time is equal to 6 minutes.

If we replace the incandescent bulb with a voltage meter and return the loop to its original configuration, then moving the bar magnet back and forth through the loop will induce an electrical current in the loop, as described by Faraday's law of electromagnetic induction.

A magnet is a material or object that produces a magnetic field, which is a force that can attract or repel certain other materials, such as iron or steel. The magnetic field is created by the motion of electric charges within the magnet, which align in such a way that they produce a net magnetic field. Magnets can be made from a variety of materials, including iron, cobalt, nickel, and certain alloys. They come in many different shapes and sizes, including bars, discs, horseshoes, and rings.

Here,

The type of current that is generated depends on the direction and rate of the magnet's motion. If the magnet is moved back and forth with a constant speed and in a straight line, the current induced in the loop will be an alternating current (AC), because the direction of the current will reverse every time the magnet changes direction. This can be observed by the voltage meter reading a voltage that periodically changes in direction.

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If the basketball weighed more after it was inflated with air than when it was deflated, this show that gas is matter because it takes up space and has mass.

Generally matter can be described as a physical substance. Descriptively it can be said that anything that takes up space and has mass is called as matter.

Clearly, an inflated basketball is bigger in size than a deflated basketball. So, it can be said that with the help of air the inflated basketball has gained size. The basketball weighed more after it was inflated with air than when it was deflated, meaning the air has mass.

Therefore, this show that gas is matter because it takes up space and has mass.

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D. The graph that indicates increase in velocity is A and the graph that indicates constant acceleration is C.

Free fall is any motion of a body where gravity is the only force acting upon it.

During the free fall of an object, the only prevailing force on the object is acceleration due to gravity.

As an object undergoes free fall motion, the velocity of the object increases downward with time while the acceleration of the object remains constant, pointing downwards as well.

From the given distance-time graph, the correct will be the one that depicts increase in velocity with time.

v = d/t

where;

The graph that indicates increase in velocity is A and the graph that indicates constant acceleration is C.

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The anticipated time when he will appear again is 5:17 pm

The given parameters;

your speed, \(V_a\) = 3 m/s

the runner's speed, \(V_b\) = 14 m/s

the diameter of the lake, d = 2 miles = 3218.69 meters

The circumference of the lake is calculated as;

\(C = \pi d\\\\C = 3.142 \times 3218.69 = 10,113.12 \ m\)

Apply concept of relative velocity to determine the time, in which he will appear again.

By the time he appears again;

the distance you moved + distance he moved = circumference of the circle

\(V_at + V_bt = 10, 113.12\\\\(V_a + V_b)t = 10,113.12\\\\(3 + 14) t = 10,113.12\\\\17t = 10,113.12\\\\t = \frac{10,113.12}{17} \\\\t = 594.89 \ s = 9.92 \ \min \ \approx 10 \ \min\)

\(t\ \approx \ \ 5:17 \ pm\)

Thus, the anticipated time when he will appear again is 5:17 pm

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Two ways electromagnetic waves are used in a home computer scanner are:

In terms of science, electromagnetic radiation (EMR) is made up of electromagnetic (EM) field waves that travel over space while carrying electromagnetic radiant energy. It consists of X-rays, gamma rays, microwaves, infrared, visible light, ultraviolet, and radio waves. These waves are all a component of the electromagnetic spectrum.

Electromagnetic waves, which are synchronised oscillations of the electric and magnetic fields, are the traditional form of electromagnetic radiation. The electromagnetic spectrum is created at various wavelengths depending on the oscillation frequency. Electromagnetic waves move at the speed of light in a vacuum.

Hence, option (A) and (B) are correct.

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Answer:

Below

Explanation:

You can use this formula to find the velocity of an object

     velocity = displacement / change in time

For this problem, we need to find displacement first

To find displacement all you need to do is find the difference between the two distances!

So our displacement here would be

     73 - 62 = 11 m

Now that we have displacement we can find velocity

      velocity = 11 / 15

                    = 0.733333....

                    = 0.73 m/s

Hope this helps! Best of luck <3

The velocity of an object that moves from 73 m to 62 m in 15 s is 0.73 m / s.

When an item is moving, its velocity indicates how quickly its location is changing as seen from a specific point of view and as measured by a specific unit of time.

If a point travels a specific distance along its path in a predetermined amount of time, its average speed throughout that time is equal to the traveled distance divided by the travel time. For instance, a train traveling 100 km in two hours is moving at an average speed of 50 km/h.

Given:

The distance of the object = 73 m to 62 m,

The time taken by the object, t = 15 s,

Calculate the displacement of the object = 73 - 62 = 11 m

Calculate the velocity by the formula given below,

\(v = d /t\)

v = 11 / 15

v = 0.73 m / s

Therefore, the velocity of an object that moves from 73 m to 62 m in 15 s is 0.73 m / s.

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The paragraph primarily discusses the concept of overwinding old clocks and its consequences, indicating that overwinding clocks used to be a common mistake. Here option D is the correct answer.

The paragraph explains that overwinding occurs when the mainspring is almost fully wound, but the operator continues to turn the winding key, resulting in the spring coiling too tightly or even breaking.

This suggests that overwinding was a mistake commonly made in the past when operating old-fashioned clocks. The other options, such as clocks changing over the years or clocks becoming fragile with age, are not directly addressed in the paragraph and are therefore less supported.

The option e. "time flies when you're having fun" is unrelated to the paragraph and can be disregarded as an irrelevant answer choice. Hence option D is the correct answer.

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An expression for velocity, v, of the meteoroid's speed at the planet's surface, in terms of G, M, v, R1, and R is v = v₁ - √{2GM/(R₁ - R)}

The value of v, the meteoroid's speed at the planet's surface, in meters per second is 2.596 * 10⁷ m/s.

The speed of the meteoroid is equal to the difference between the speed of the meteorite, v₁, and the escape velocity of the meteorite from the gravitational pull of the planet.

The escape velocity of an object is equal is the velocity of an object which when summed with the gravitational potential energy of the object is equal to zero.

The formula for escape velocity, Ve, is given below:

Ve = √2GM/r

where;

G = universal gravitational constant

M = mass of the body to be escaped from

r = distance from the center of the mass

G is the gravitational constant = 6.67 * 10⁻¹¹ m³kg⁻¹s⁻²

v₁ = 2.6 * 10⁷ m/s

Hence, the velocity of the meteorite will be:

v = v₁ - √{2GM/(R₁ - R)}

Calculating the velocity, v

v = 2.6 * 10⁷ m/s - √{(2 * 6.67 * 10⁻¹¹ * 9.6 * 10²⁵ ) / (1.6 * 10⁷ - 0.22 * 10⁷)}

v = 2.596 * 10⁷ m/s

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Answer:

277.78 hours

Explanation:

The formula for calculating the amount of charge is expressed as;

Q = It

I is the current

t is the time

Given

I =0.05A

Q = 50,000C

Required

Time t

Recall that: Q = It

t = Q/I

t = 50,000/0.05

t = 1,000,000secs

Convert to hours

1,000,000secs  = 1,000,000/3600

1,000,000secs = 277.78 hours

Hence it will take 277.78 hours for the charge to flow through the diode

To determine the angle through which the wheel rotates in 1.00 second, we can start by finding the angle covered in 0.0710 seconds and then scale it up to 1.00 second.

In 0.0710 seconds, the wheel completes 3.10 revolutions. One revolution corresponds to an angle of 360 degrees or 2π radians. Therefore, in 0.0710 seconds, the wheel rotates through an angle of:

Angle = 3.10 revolutions * 2π radians/revolution = 6.20π radians

To find the angle in 1.00 second, we can use proportional reasoning. Since the time increases by a factor of 1.00/0.0710, the angle covered will also increase by the same factor:

Angle in 1.00 second = 6.20π radians * (1.00/0.0710) = 87.32π radians

Approximately, the angle through which the wheel rotates in 1.00 second is 274.39 radians.

Therefore, the wheel rotates through an angle of approximately 274.39 radians in 1.00 second.

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Cheese is made of casein protein, which is originally made from milk and is high in protein. The texture of the cheese is determined by the quality of the milk, so cow's milk cheese differs from goat's milk cheese.

Diary products are made from milk, such as cheese, curd, yogurt, etc., but all of them have different nutrients. The quality of these dairy products depend upon the quality of the milk, as some milking animals have a higher concentration of fats in their milk than other animals. These dairy products are used in different industrial sectors, such as for making ice cream, chocolate, and different food products.

Hence, cheese is made up of casein proteins that are present in the milk.

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The creation of an electric current or magnetic field depends on the movement of electrons  is true about electricity and magnetism.

Option A is correct.

The motion and presence of charged particles constitute the essence of electricity. The force that the magnets exert when they attract or repel one another, on the other hand, is referred to as magnetism. As a result, we can see how distinct they are from one another.

Electromagnetism encompasses a variety of phenomena, one of which is magnetism. Ferromagnetic materials, which can be magnetized into permanent magnets and generate their own magnetic fields by being strongly attracted by magnetic fields, exhibit the most well-known effects. A magnet can also be demagnetized.

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Answer:

So the answer would be water based on the evidence shown below.

Explanation:

Mercury is a poor conductor of heat but good for electricity, water is a good conductor of heat but a poor conductor of electricity, wood is a poor conductor of heat and electricity, and glass is probably the worst conductor of heat.

The earthquake would occur 13 minutes before 10:05 a.m. which will be at 9.52 am.

The p-waves travel with a constant velocity of 7 km/s

The time can be calculated by using the formula

t = d / v

where

T1 =  10:05 a.m

d is the distance they take to travel from the epicenter

v is the speed of the p-waves

On average, the speed of p-waves is

v = 7 km/s

d = 5600 km (given)

Substituting the values in the formula;

t = d / v

t = 5600 ÷ 7

t = 800 seconds

Converting into minutes,

t = 800 ÷ 60

t = 13.3

≈ 13 mins

T1 -  13 mins = T2

10:05 - 13 mins = 9.52 am

It means the earthquake occurred prior 13 minutes, that is at 9.52 am.

Therefore, the earthquake occurred at 9.52 am.

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