While looking at an article about energy resources, you notice a bulleted list
with the title "Pros and Cons." This tells you that the article will present both
sides of the issue. Which active reading strategy are you using?
A. Using text features and visual cues
B. Making mental images
C. Monitoring and applying fix-up strategies
D. Summarizing

0.441 J of energy will be transported across a 1.00-cm2 area per hour by an EM  wave whose electric field has an RMS strength of 21.5 v/m

Energy transfer across area = 1 \(cm^{2}\)  =  \(10^{-2}\) \(m^{2}\)

since , Current = \(E_(rms)^{2}\)/ c * mu0

c = speed of light  = 3 * \(10^{8}\) m/s

mu0 = 4π * \(10^{-7}\)

I = \((21.5)^{2}\) * 3600 *   \(10^{-4}\) /  3 * \(10^{8}\)  * 4 * 3.14 * \(10^{-7}\)

 = 0.441 J

hence , 0.441 J of energy will be transported across a 1.00-cm2 area per hour by an EM  wave whose electric field has an RMS strength of 21.5 v/m

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A tennis player hits a 56.0 g ball vertically with her racket to warm up for a match.

In this scenario, the tennis player is using the vertical hitting of the ball as a warm-up exercise before the match.

This helps to increase blood flow to the muscles, improve coordination, and prepare the body for the more intense activity of a tennis match.

The mass of the ball, 56.0 g, is given as part of the problem, but there is no information provided about the force or velocity of the hit.

Summary: A tennis player warms up by hitting a 56.0 g ball vertically with her racket, which aids in preparing her body for the match. However, information regarding the force or velocity of the hit is not provided.

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Answer:

1.37 x 10^-9

Explanation:

Trust me bro.

The capacitance of the parallel plates is approximately 1.37275 nanofarads (nF).

To find the capacitance of the parallel plates, we can use the formula for the capacitance of a capacitor, which is:

Capacitance (C) = ε₀ * (A / d)

Where:

ε₀ (epsilon naught) is the vacuum permittivity constant, approximately equal to 8.85 x\(10^{-12\) F/m (farads per meter).

A is the area of one of the plates.

d is the separation distance between the plates.

Given:

A = 0.155 \(m^{2}\)

d = 0.00100 m

Let's plug these values into the formula:

C = 8.85 x \(10^{-12\) F/m * (0.155 \(m^{2}\)/ 0.00100 m)

C = 8.85 x \(10^{-12\) F/m * 155

C = 1.37275 x \(10^{-9\) F

The capacitance of the parallel plates is approximately 1.37275 nanofarads (nF).

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Answer:

Acceleration =13.63m/s^2

initial velocity = v = 45

final velocity = u = 0

acceleration = v-u/t

Energy can neither be created nor destroyed during a chemical reaction but it can only be transformed from one form of energy to another form of energy.

Energy transformation refers to energy conversion from one form of energy to another form of energy.  such as in a hydroelectric dam that transforms the kinetic energy of water into electricity. The work of the energy transformations that take place in living organisms the leads to work.

While energy can be transformed, the total quantity of energy remains the same so  this is known as energy conservation.

So we can conclude that Energy transformation also known as energy conversion, is the procedure of changing energy.

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the lowest theoretical temperature that can exist in the universe on the Kelvin scale is zero kelvin (0 K)

Absolute zero, technically known as zero Kelvin, corresponds to -273.15 degrees Celsius or -459.67 degrees Fahrenheit and marks the point on the thermometer where the system reaches the lowest possible energy or thermal motion. However, there is a catch.

Absolute zero cannot be reached.

Two of the most commonly used temperature measurement scales in the thermometer industry are the Kelvin and Celsius scales. A value of 1 degree on the Kelvin scale is the same as a value of 1 degree on the Celsius scale. That is, the temperature difference or temperature change is the same on both scales.

You can use this relationship to convert Celsius to Kelvin.

Celsius = (Kelvin - 273.15)

0r

Kelvin = (Celsius + 273.15)

The Kelvin to Celsius formula is used to convert temperature expressed in Kelvin to Celsius.  

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Resistance(R) of a device is given by

Final answer is :- 2.67 ohm

Answer:

A touch screen on a phone is an example of a device that uses a capacitor.

When you bring your finger close to the screen your finger acts as one of the plates.

A sensing circuit works out the position of your finger. The camera on a phone is an example of a device that uses a CCD.

Light hits a grid of devices that produce charge.

Each of the squares is a capacitor.

Answer:

Observations of white dwarf supernovae

Explanation:

The wind turbine with a blade diameter of 25 m and an average wind velocity of 6 m/s has an average electric power output of 172.34 kW. For an annual operating time of 8000 hours, the turbine will produce approximately 1,378,720 kWh of electricity.

If sold at a price of $0.09/kWh, the revenue generated from the electricity produced by the turbine would be approximately $124,086.72. To calculate the average electric power output, we can use the formula:

\(\[P = \frac{1}{2} \times \text{{density of air}} \times A \times v^3 \times \text{{efficiency}}\]\)

Substituting the given values into the formula, we can calculate the average electric power output:

\(\[P = \frac{1}{2} \times 1.3 \, \text{{kg/m}}^3 \times \left(\frac{\pi}{4} \times (25 \, \text{{m}})^2\right) \times (6 \, \text{{m/s}})^3 \times 0.34 \approx 172340 \, \text{{watts}} \approx 172.34 \, \text{{kW}}\]\)

To determine the amount of electricity produced for an annual operating time of 8000 hours, we multiply the average electric power output by the operating time:

\(\[\text{{Electricity produced}} = P \times \text{{operating time}} = 172.34 \, \text{{kW}} \times 8000 \, \text{{h}} = 1,378,720 \, \text{{kWh}}\]\)

Finally, to calculate the revenue generated, we multiply the electricity produced by the selling price per kilowatt-hour:

\(\[\text{{Revenue}} = \text{{Electricity produced}} \times \text{{price per kWh}} = 1,378,720 \, \text{{kWh}} \times \$0.09/\text{{kWh}} \approx \$124,086.72\]\)

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The distance moved by the object in the direction of the force is equal to 16 m. Therefore, option (B) is correct.

Work can be demonstrated as the energy employed when a force is exerted to move an object through a specific distance. The work done depends upon both the exerted force on the object and the displacement.

The action of the force when the object is moving in a straight line in the direction of the exerted force over a distance 'd'.

W= F ×d

Where 'd' is the displacement, 'F' is the applied force and W is the work done.

Given, the work done by the applied force, W = 400 J

The force applied on the object, F = 25 N

The distance moved by the object, d = W/F

d = 400/25

d = 16 m

Therefore, the object moves a distance of 16 m in the direction of the force.

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Answer:

Explanation:

For every action (or force), there is an equal and opposite action (or force).

Answer:

0.00025 kilometers

Explanation:

divide the length value by 1e+6

Answer:

250 mm = 0.00025 km.

Explanation:

250 mm equal 0.00025 km

Conversion details

To convert mm to km use the following formula:

1 mm equals 0.000001 km

So, to convert 250 mm to km, multiply 0.000001 by 250 i.e.,

250 mm = 0.000001 * 250 km = 0.00025 km

(hope this helps can i plz have brainlist :D hehe)

Answer:

v_f = -7.5 m / s

Explanation:

Let's analyze this exercise a little, two forces that act on a body for different time intervals are indicated, each force creates an impulse and since this is a vector quantity we must add in the form of vectors. The net momentum is

we assume that the direction to the right is positive

             I = I₁ + I₂

             I = F₁ Δt₁ - F₂ Δt₂

             I = 3  1.5 - 4  3

             I = -7.5   N s

now let's use the relationship between momentum and momentum, suppose the object starts from rest (vo = 0)

             I = Δp

             I = m (v_f - v₀)

             v_f = I / m

              v_f = -7.5 / m

to finish the calculation we must assume a mass m = 1 kg

              v_f = -7.5 m / s

the negative sign in the body is moving to the left

Answer:

Explanation:  v = v₀ + gt = 0 + 9.80665 * 8 = 78.45 m/s

Answer:

mechanical energy

Explanation:

Answer:

When you fill it up its chemical energy but it gets transformed into mechanical energy.

Explanation:

The internal combustion engine, which is utilized in most automobiles, has allowed for the transfer of chemical energy into mechanical energy. This provides locomotion for the vehicle as it is driving.

Answer:

what is the number

Explanation:

The ocean floor is estimated to be approx 5,040 meters deep at the point where the sonar pulse was sent, based on the recorded echo delay of 3.35 seconds and assuming a constant speed of sound in seawater.

To calculate the depth of the ocean floor, we can use the formula: depth = (speed of sound × time) / 2. Given that the speed of sound in seawater is 1531 m/s and the recorded echo delay is 3.35 seconds, we can substitute these values into the formula.

depth = (1531 m/s * 3.35 s) / 2 = 2572.685 meters

However, this calculation provides the round-trip distance, which includes both the downward and upward journey of the sonar pulse. To find the actual depth of the ocean floor, we need to divide this value by 2:

depth = 2572.685 meters / 2 = 1286.3425 meters

Therefore, the ocean floor is estimated to be approximately 1286.3425 meters deep at the point where the sonar pulse was sent.

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Answer:

it's B

Explanation:

Elastic potential energy is energy stored as a result of applying a force to deform an elastic objects. The energy is stored until the force is removed and the object springs back to it's original shape, doing work in the process. The deformation could involve compressing, stretching or twisting the object

Answer: Elastic energy

Explanation:

A PE X

A moving van smoothly travels at constant speed with a stone softly affixed to the center of its roof ( velocity). When the glue fails, the stone tumbles to the ground and lands precisely below the ceiling's middle.

In terms of physics, velocity is a vector measure of the motion's direction and speed. The shift that occurs in an object's position relative to a reference point and time is a more precise definition of velocity.

Why is it wrong to use the phrases velocity and speed interchangeably? It is clear why. Velocity, as opposed to speed, refers to the pace and direction of the an object's movement as it moves down a path.

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The new temperature of the gas inside the cylinder is 594 K.

The temperature of a gas is directly proportional to its pressure when the volume is constant. This relationship is expressed mathematically in Charles' law, which states that for a fixed mass of gas at a constant volume, the temperature and pressure of the gas are directly proportional. Therefore, if a cylinder of fixed mass of petroleum gas at a temperature of 24 °C had a pressure inside the cylinder of 100 KPa above the atmospheric pressure, when exposed to an open flame, the pressure inside the cylinder increased to 300 KPa above atmospheric pressure. To calculate the new temperature of the gas inside the cylinder assuming no change in volume, we use the combined gas law equation which relates the pressure, volume, and temperature of a gas. The equation is given as:P1V1/T1 = P2V2/T2Where P1V1/T1 = (100 + 100)kPa = 200 kPa P2V2/T2 = (100 + 300) kPa = 400 kPa, and T1 = 24 + 273 = 297 KThe volume of the gas is constant, which implies that V1 = V2; hence we can write the equation above as follows:V/T = constant, where V is volume, and T is temperatureTherefore, V1/T1 = V2/T2 and substituting the values we have, we can solve for T2 as follows:V1/T1 = V2/T2 => T2 = T1 × (P2/P1)T2 = 297K × (400/200)T2 = 594K

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Answer:

water can change to a solid even though its a liquid

Explanation:when water freezes it turns into a solid

The ice cube floating in my sody is getting smaller and smaller.

There was a puddle of rain water on the ground by the side door this morning, but there's no puddle there now.

The present value of an ordinary annuity is found in the period before the first annuity payment.

An annuity is a financial product that provides a series of payments over a specific period of time. It is typically used as a retirement savings tool or as a means of providing income for a set number of years. There are different types of annuities, including fixed annuities, variable annuities, and indexed annuities.

Each type of annuity has different features and benefits, and it is important to understand how they work before deciding whether an annuity is right for you. Annuities can be a valuable part of a financial plan, but they are not suitable for everyone, so it is important to carefully consider your individual needs and goals before making a decision.

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Answer:

A or B you choose

Explanation:

This is called current electricity or an electric current. A lightning bolt is one example of an electric current, although it does not last very long. Electric currents are also involved in powering all the electrical appliances that you use, from washing machines to flashlights and from telephones to MP3 players.

what is an electrical current, amp, ampere Current is the flow of electrons. When a circuit is closed then a current of electrons can flow and when a circuit is open then no current can flow. We can measure the flow of electrons just like you can measure the flow of water through a pipe.

High energetic winds turning generator , causing electrons to flow into power lines is an example of current electricity. Remaining all are examples of static electricity .

The movement of electrons from one area of the circuit to another is referred to as current electricity. Free electrons flow between two points when two bodies with different potentials are connected by a wire, until both objects reach the same potential, at which point the current stops.

Current flows until a potential difference exists throughout the conductor. The following techniques can be used to produce current electricity:

1. Through the passage of a metal wire through a magnetic field (Both alternating current and direct current can be generated by the following method)

2.Utilizing a battery and chemical reactions (Direct current can be generated through this method)

Here, the wind's kinetic energy provide the mechanical energy for the generator to to produce power lines. Hence option A is correct. All others are static electricity for short time only.

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Answer:

Elements in the same group have similar reactivity properties because they have the same number of valence electrons.

i hope you will accept my answer and please put a picture next for your next question

The displacement of the bicycle is 85.3125m

Displacement of the bicycle may be defined as the change in position of the bicycle. It is a vector quantity so that it has direction and magnitude.

We are given that,

The initial velocity of the bicycle = u = 5m/s

The acceleration of the bicycle is = a = 2.5 m/s²

The time taken by the bicycle = t = 6.5 seconds

Therefore, to get the value of displacement of the bicycle by the equation of motion which is written as,

S = ut + (1/2) at²

Where, S is displacement, u is initial velocity, a is acceleration and t is time taken by the bicycle.

Since , putting the values in above equation then we get,

S = {5m/s × 6.5sec} +{ (1/2) × 2.5m/s² × (6.5 sec)²}

S = 32.5 m + 52.8125m

S = 85.3125m

Therefore, the bicycle would be moves 85.3125m

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A proton and an electron in a hydrogen atom are separated on the average by about 4.8x10-11 m. The magnitude and direction of the electric field set up by the proton at the position of the electron is (E)=  6.24×10¹¹ N/C.

The electric field is a field that is created by any positive or negative charge. In an atom the electron or proton that creates a field that called the electric field.

To calculate the electric field we are using the formula here ,

E= k(q/r²)

Where we are given,

k= The Coulomb's constant . = 8.99 ×10⁹ N.m²/C²

q= The charge of the electron. = 1.6×10⁻¹⁹ C

r= The distance of separation of atom. = 4.8×10⁻¹¹ m.

We have to calculate the electric field of the atom. = E

Now we put the values we get,

E= k(q/r²)

Or, E=  8.99 ×10⁹×(1.6×10⁻¹⁹/(4.8×10⁻¹¹)²)

Or, E=  6.24×10¹¹ N/C

Now we can say that, The magnitude and direction of the electric field set up by the proton at the position of the electron is (E)=  6.24×10¹¹ N/C.

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An object in motion eventually stops because of friction.

Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or continue its moving in a straight line at constant speed unless force is applied on it.

So we can conclude that An object in motion eventually stops is the correct answer.

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The wavelength of radio waves broadcast by a radio station with a frequency of 1300khz would be 230.76 m

It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.

The wavelength is inversely proportional to the frequency of the wave as from the following relation.

C = νλ

As given in the question  the wavelength of radio waves broadcast by a radio station with a frequency of 1300khz,

By using the formula

C = νλ

3×10⁸ = 1300 ×10³×λ

λ = 3×10⁸/ 1300 ×10³

  = 230.76 m

Thus,the wavelength of the radio waves comes out to be 230.76 m.

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