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The photoelectric effect is observed when light interacts with matter, specifically when photons (particles of light) transfer their energy to electrons in an atom or a material. The correct answer is A. When an electric current results from light shining on a surface.

In the early 20th century, Albert Einstein provided a groundbreaking explanation of the photoelectric effect, which earned him the Nobel Prize in Physics in 1921. His work established the dual nature of light, both as a wave and as a particle (photon). Here's a detailed explanation of the photoelectric effect:

When light shines on a surface, it is composed of photons that carry energy. These photons interact with electrons in the material. The photoelectric effect occurs when photons transfer their energy to electrons, causing them to be emitted from the material.

The process can be described in several steps:

1. Absorption: When a photon with sufficient energy interacts with an electron in an atom or material, it can be absorbed. The energy of the photon is transferred to the electron, promoting it to a higher energy level or even releasing it from the atom.

2. Ejection: If the energy of the absorbed photon is greater than or equal to the binding energy of the electron (also known as the work function), the electron can be ejected from the material. The work function represents the minimum energy required to remove an electron from the material's surface.

3. Electron emission: The ejected electron can now contribute to the formation of an electric current. If there is a conducting material connected to the surface, the released electron can move through the material, resulting in the flow of electric charge.

The photoelectric effect is not observed when light acts solely as a wave (option B). While light does exhibit wave-like properties, such as interference and diffraction, these phenomena do not directly involve the transfer of energy from photons to electrons.

Option C, "When an electric current causes light to be produced," does not accurately describe the photoelectric effect. The photoelectric effect involves the emission of electrons due to the interaction of light with matter, but it does not directly produce light as a result of an electric current.

Option D, "Any time an electric current is produced," is a broad statement that encompasses various phenomena beyond the photoelectric effect. Electric currents can be produced in various ways, such as through the flow of charged particles or the movement of electrons in a conductor. The photoelectric effect is a specific phenomenon that occurs when light interacts with matter and results in the emission of electrons.

To summarize, the photoelectric effect is observed when light shines on a surface, and the energy of photons is transferred to electrons, leading to their emission from the material. This emission of electrons can result in the formation of an electric current.

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I think it is the question:

When is the photoelectric effect observed?

A. When an electric current results from light shining on a surface

B. When light acts as a wave

C. When an electric current causes light to be produced

D. Any time an electric current is produced .

a. The ball was in the air for 5.53 seconds.

b. The initial velocity of the ball is 54.194 m/s

c. The final velocity of the ball in the y direction is -54.194 m/s

d. The x component of the initial velocity is 50.926 m/s, and the y component is 18.534 m/s.

To solve these questions, we can use the equations of motion for projectile motion. Let's assume the acceleration due to gravity is -9.8 m/\(s^2\) (taking downward as the negative direction).

a. To find the time the ball was in the air, we can use the equation:

Δy = v_iy * t + (1/2) * a_y * \(t^2\)

Where Δy is the vertical displacement, v_iy is the initial vertical velocity, a_y is the vertical acceleration, and t is the time.

Since the ball was dropped from rest, its initial vertical velocity is 0 m/s, and the vertical displacement is -150 m (negative because it is going downward).

-150 = 0 * t + (1/2) * (-9.8) * \(t^2\)

Simplifying the equation and solving for t, we get:

4.9 * \(t^2\) = 150

\(t^2\) = 150 / 4.9

t ≈ 5.53 seconds

Therefore, the ball was in the air for approximately 5.53 seconds.

b. To find the initial velocity of the ball, we can use the equation:

v_fy = v_iy + a_y * t

Where v_fy is the final vertical velocity.

Since the ball lands 30 m away, its final vertical displacement is 0 m, and the time is 5.53 seconds.

0 = v_iy + (-9.8) * 5.53

Solving for v_iy, we get:

v_iy = 9.8 * 5.53

v_iy ≈ 54.194 m/s

Therefore, the initial velocity of the ball is approximately 54.194 m/s.

c. The final velocity of the ball in the y direction is the same as the initial velocity because the only force acting on it is gravity, which causes a constant acceleration. Therefore, the final velocity in the y direction is approximately -54.194 m/s (negative due to the downward direction).

d. When the ball is kicked off the building at an angle of 20 degrees below the horizontal, we need to find the x and y components of the initial velocity.

The magnitude of the initial velocity (from part b) is 54.194 m/s.

The x component of the initial velocity can be found using:

v_ix = v_i * cos(θ)

Where θ is the angle of 20 degrees below the horizontal.

v_ix = 54.194 * cos(20)

v_ix ≈ 50.926 m/s

The y component of the initial velocity can be found using:

v_iy = v_i * sin(θ)

v_iy = 54.194 * sin(20)

v_iy ≈  18.534 m/s

Therefore, the x component of the initial velocity is approximately 50.926 m/s, and the y component is approximately 18.534 m/s.

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The question was Incomplete, Find the full content below:

A soccer ball is kicked off a 150 m tall building and lands 30 m away.

a. How long was the ball in the air?

b. What was the initial velocity of the ball?

C. What is the final velocity of the ball in the y direction?

d. Assume the ball has the same speed as you solved for in part b except it is kicked off the building at an angle of 20 degrees below the horizontal. What is the x component of the initial velocity? What is the y component of the initial velocity?

Answer:

Finna take your points

Explanation:

The other answer got maxed out ฅ^•ﻌ•^ฅ

Answer:

Niháo wúji si fiueng^^

Explanation:

I just introduced myself in Mandarin^^

The time taken by the box to reach the velocity of 2 m / s will be 4 sec.

Force is defined as the external effort or agent applied to the object in a particular direction to displace it from one position to another position. The force is measured in a Newton.

Given that the force applied is 5 N and the velocity is 2 m / s. The mass of the object is 10 kg.

The time required by the object to get the velocity of 2 m/s will be calculated as:-

Force x Time = m x V

Time = ( m x V ) / F

Time  = ( 10 x 2 ) / 5

Time = 4 sec

Hence, the time will be equal to 4 seconds.

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Answer:  the difference between a Structure is from the Latin word structura which means "a fitting together, building." Although it's certainly used to describe buildings, it can do more than that and a In physical cosmology the inflationary epoch was the period in the evolution of the early universe when, according to inflation theory, the universe underwent an extremely rapid exponential expansion.

Explanation:

Energy is transferred to the charge is 120J

What is energy?

Energy is a general term that we use frequently in our daily lives. Although the term "energy" is frequently misused, it has a specific physical meaning. In physics, energy is defined as something's ability to accomplish work. Energy can take various forms. All energy is either kinetic or potential. Let us take a closer look at what energy is and the many sorts of energy in this post.

On Earth, there are various types of energy. On Earth, the sun is considered the elemental form of energy. Energy is a quantifiable property in physics that can be transferred from an item to perform work. As a result, we can define energy as the ability to perform any type of physical activity.

According to the laws of energy conservation, "energy cannot be generated or destroyed; it can only be transformed from one form to another." Joule is the SI unit of energy. One of the fundamental rules of physics is the law of energy conservation. It regulates the movements of individual atoms in a chemical process at the microscopic level. According to the rule of conservation of energy, "the entire energy of the system is conserved in a closed system, i.e., a system that is separated from its surroundings." Even when energy transformation happens, the overall energy in a system is conserved, according to the law. Energy can't be created or destroyed.

E = Q X V

E=10X12

E=120J

Therefore, energy is transferred to the charge is 120J

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The current in the circuit is 0.5 A

what is current?

An electrical charge carrier flow known as current often involves electrons or atoms lacking in electrons. The capital letter I is a typical way to represent current.

I = V/R

I = 9/18

I = 0.5 A

Therefore, the current in the circuit is 0.5

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The circuit's current is 0.5 A.

What is current?

An electric current is a flow of charged particles, such as electrons or ions, across a conductor or space. It is calculated as the net rate of charge flow through a surface or into a control volume. Charge carriers are moving particles that can be one of numerous sorts depending on the conductor. Electrons flowing over a wire are frequently used as charge carriers in electric circuits. They can be either electrons or holes in semiconductors. Ions are the charge carriers in an electrolyte, whereas ions and electrons are the charge carriers in plasma, an ionised gas.

I = V/R

I = 9/18

I = 0.5 A

Therefore, the current in the circuit is 0.5

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In the Van de, Graaff generator is a rubber belt stretched over two pulleys. At the bottom is the drive pulley connected to the motor. In the generator above the drive, the pulley is covered with felt and the top pulley is bare plastic.

Van de Graaff Generators are devices used to generate large amounts of static electricity. Static electricity is created by an extra charge stored somewhere to keep things from moving. Fees generally don't like to accumulate in one place. They seek out opposite charges as partners and like to run away from particles with the same charge.

When switched on the dome of the Van de Graaff generator is charged positively or negatively depending on the design. Anything that touches the dome receives the same charge. When a person has a dome, it is charged and can stand on end if the hair is long and dry enough. Most Van de Graaff generators store a positive charge in the dome by separating the negative charge from the positive charge.

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15 HP at 240 V is the maximum size of a three-phase, 240-volt motor that can be controlled using a size 2 NEMA contactor

This is further explained below.

Generally, Size 2 NEMA contactors can only handle three-phase, 240-volt motors up to 15 horsepower at 240 volts.

In conclusion, Contactors and motor starters produced by NEMA (National Electrical Manufacturers Association) are graded according to their sizes. These sizes are categorized according to the current and power ratings that they carry.

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Answer:

True

Explanation:

I am right

Answer:

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option D.

What is matter?

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. For a gravitational field to be generated between two objects, Both objects must have mass.

Therefore, the correct option is option D.

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Following a late-night mac and cheese and ice cream feast, energy metabolism involves the digestion and absorption of the consumed food, followed by the utilization of nutrients for energy production and storage.

After consuming a meal rich in mac and cheese and ice cream, the digestion process begins in the stomach and continues in the small intestine. Carbohydrates from the mac and cheese and fats from the ice cream are broken down into simpler molecules, such as glucose and fatty acids, respectively. These molecules are then absorbed into the bloodstream and transported to various tissues and organs.

Once absorbed, glucose is used as an immediate source of energy by the body. It is taken up by cells, where it undergoes glycolysis and enters the citric acid cycle (also known as the Krebs cycle) to produce ATP, the energy currency of the body. Excess glucose that is not immediately needed for energy is converted into glycogen and stored in the liver and muscles for future use.

Similarly, the fatty acids derived from the consumed fats are transported to adipose tissue for storage as triglycerides. These triglycerides can later be broken down into fatty acids and used as an energy source when the body needs additional fuel.

In summary, following a late-night mac and cheese and ice cream feast, energy metabolism involves the digestion and absorption of carbohydrates and fats, the utilization of glucose for immediate energy production, and the storage of excess energy as glycogen and triglycerides for future use.

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Answer:

Initial velocity is the velocity at time interval=0 and it is represented by u.lt is the velocity at which the motion starts. they are four initial velocity formulas:(1) if time, acceleration and final velocity are provided,the initial velocity is articulated as.

l hope it's helpful for you.....

Answer: 6 OR 7

Explanation:

Object distance = 26.86 cm

Given:

Image distance, v = -47.0 cm

Magnification, M = 1.75

Object distance, u = ?

Object distance = 26.86 cm

The basketball player must be going at 3.57 m/s when she leaves the ground.

Given the following data:

We know that acceleration due to gravity (a) for an object or body is equal to 9.8 meter per seconds square.

To find how fast (velocity) the basketball player must be going when she leaves the ground, we would use the third equation of motion;

\(V^2 = U^2 + 2aS\)

Where:

Substituting the given parameters into the formula, we have;

\(V^2 = 0^2 + 2(9.8)(0.65)\\\\V^2 = 12.74\\\\V = \sqrt{12.74}\)

Final velocity, V = 3.57 m/s

Therefore, the basketball player must be going at 3.57 m/s when she leaves the ground.

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Recall, Newton's gravitational law states that any particle of matter in the universe attracts any other particle with a force varying directly as the product of their masses and inversely as the square of the distance between them. It is expressed as

F = Gm1m2/r^2

where

F is the force in Newton

G is gravitational constant = 6.673 x 10^-11 Nm^2/kg^2

m1 and m2 are the masses in kg

r is the distance in meters

From the information given,

r = 1.5

acceleration = 2cm^2/s

Recall, 100 cm = 1m

2 cm = 2/100 = 0.02m

Thus,

acceleration = 0.02m/s^2

Since the masses are identical, then m1 = m2

Each of them is accelerating at 0.02m/s^2

Recall,

Force = mass x acceleration

Force = m1 x 0.02 = 0.02m1 N

By substituting the given values into the formula, we have

0.02m1 = (6.673 x 10^-11 x m1 x m1)/1.5^2

m1 on the left cancels out one m1 on the right. It becomes

0.02 = (6.673 x 10^-11 x m1)/1.5^2

By crossmultiplying,

0.02 x 1.5^2 = 6.673 x 10^-11 x m1

0.045 = 6.673 x 10^-11 x m1

m1 = 0.045/6.673 x 10^-11

m1 = 6.74 x 10^8 kg

The mass of each ball is 6.74 x 10^8 kg

Explanation:

You are given g  and  ml

   density =   g/ ml = 7.452 / (6.0) = 1.2 gm/ml

The best reason to put a visible-light telescope in space instead of on the ground is that the telescope is above the atmosphere so the light does not get distorted by turbulent air.

This means that images taken by space telescopes are much clearer and more detailed than those taken by ground-based telescopes.

Additionally, space telescopes are not affected by weather conditions or light pollution, which can also impact the quality of images taken by ground-based telescopes. Space telescopes can be larger than those on the ground, and they are not affected by earthquakes.

Overall, the lack of atmospheric interference is the biggest advantage of using a space telescope for visible-light observations.

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1.) The AMA is 2.5

2.) The VR is 5.

3.) The efficiency is 50%.

Given that the object has a weight of 250 N and the effort needed to push it up the ramp is 100 N, we can calculate the AMA as follows:

AMA = Load / Effort

AMA = 250 N / 100 N

AMA = 2.5

Therefore, the AMA is 2.5.

To calculate the VR, we need to find the distance moved by the effort and the distance moved by the load. The distance moved by the effort is the length of the ramp, which is 50 m. The distance moved by the load is the height it is raised, which is 10 m. Therefore, we have:

VR = Distance moved by effort / Distance moved by load

VR = 50 m / 10 m

VR = 5

Therefore, the VR is 5.

To calculate the efficiency, we need to find the work done by the load and the work done by the effort. The work done by the load is:

Work done by load = Load x Distance moved by load

Work done by load = 250 N x 10 m

Work done by load = 2,500 J

The work done by the effort is:

Work done by effort = Effort x Distance moved by effort

Work done by effort = 100 N x 50 m

Work done by effort = 5,000 J

Therefore, the efficiency is:

Efficiency = (Load x Distance moved by load) / (Effort x Distance moved by effort)

Efficiency = (2,500 J) / (5,000 J)

Efficiency = 0.5 or 50%

Therefore, the efficiency is 50%.

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Answer: A satellite with a mass of 110 kg and a kinetic energy of 3.08×10^9 J must be moving at a speed of 7483 m/s.

Explanation: To find the answer we need to know about the kinetic energy of a body.

                                   \(KE=\frac{1}{2}mv^2\)

                                   \(m=110kg\\KE=3.08*10^9J\\\)

                               \(v=\sqrt{\frac{2KE}{m} } =\sqrt{\frac{2*3.08*10^9}{110} } =7.483*10^3 m/s\)

Thus, we can conclude that, the velocity of the satellite will be 7438m/s.

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In order to move at a speed of 7483 m/s, a satellite with a mass of 110 kg and a kinetic energy of 3.08× 10^-9 J must be travelling.

Understanding a body's kinetic energy is necessary in order to determine the solution.

                         \(KE=\frac{1}{2}mV^2\)

               \(m=110kg\\KE=3.08*10^9J\)

                        \(V=\sqrt{\frac{2KE}{m} }=7.48km/s\)

Thus, we can infer that the satellite will move at a speed of 7438 m/s.

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c.The burning of fossil fuels releases compounds into the air that can be harmful to breathe.

d.Communication technology can cause people to undervalue face-to-face communication.

e.People can become unnecessarily dependent on technology to complete tasks they used to do themselves.

Answer:

Carbon is the cornerstone of most biologically produced organic compounds such as proteins, carbohydrates, fats and DNA. All of these compounds contain, in addition to carbon, many other elements, including hydrogen, nitrogen and oxygen.

Explanation:

The final speed V2 is given by (M/M+I/R^2) x initial speed.

We can solve this problem by using the principle of conservation of momentum and the relation between impulse and change in momentum.

Initially, the block has a momentum of MV1 to the right, and the cylinder is at rest, so its momentum is zero.

When the block makes contact with the cylinder, there is a collision between them. The force of friction between the block and the cylinder provides an impulse to the block, causing its momentum to change from MV1 to MV2.

At the same time, the cylinder starts to rotate due to the force of friction, so its angular momentum changes from zero to MRV2, where R is the radius of the cylinder.

By conservation of momentum, the total momentum of the system (block + cylinder) must remain constant. Therefore, we have:

MV1 = MV2 + MRV2

Simplifying this equation, we get:

V2 = (M/M+MR) V1

To express the final speed V2 in terms of VI, M, I, and R, we can substitute MR = I/R^2, the rotational inertia of the cylinder, into the above equation:

V2 = (M/M+I/R^2) V1

Therefore, the final speed V2 is given by (M/M+I/R^2) times the initial speed V1.

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The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.

By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.

The following equation relates the distance to the direction and initial velocity:

d = [v₀²sin2θ]/g, where θ – the angle of the jump.

Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62

v₀ = 10.65 m/s ( the take off speed).

The horizontal velocity equals:

vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s

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Answer:

All cells come from pre-existing cells

Explanation:

Rudolf Virchow, a German Physician, stated the theory that all cells arise from pre-existing cells. He used this theory to explain disease pathology at the cellular level. His work helped clarify that diseases occur not at tissue or organ level, but at the cellular level. This resulted in more accurate diagnosis of diseases by other scientists.

His legacies includes being among the first to use animals in his research, first to name numerous diseases and also the creation of many medical terms still in use today.

Answer:

In practical terms, density is the weight of a substance for a specific volume. The density of water is roughly 1 gram per milliliter but, this changes with temperature of if there are substances dissolved in it. Ice is less dense than liquid water which is why your ice cubes float in your glass.

Explanation: