How has the understanding of the electron's position in the model of the atom changed over time?

It will cost 0.324 Dollars to light six 100w light bulbs for six hours if the price of electrical energy is $0.09/ kwh.

kwh is commercial unit of electric energy. 1 unit= 1 kwh.

When 100 w power device is run for 1 hour, the amount of electrical energy consumed is 1 kwh.

We will find total units of electrical energy consumed in the given question.

energy consumed by 6 bulbs = 6×100= 600 w( joules per second).

The value in kwh is = 600÷1000

                                = 0.6kwh

Total energy consumed in 6 hours is = 0.6×6 = 3.6 kwh

So, the cost is = 3.6×0.09 = 0.324 dollars.

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Kirchhoff's Current Law (KCL), also known as the Junction Rule, states that the sum of currents entering a junction in an electrical circuit must equal the sum of currents leaving the junction.

In other words, the total current flowing into a junction must be equal to the total current flowing out of the junction. This law is important in analyzing complex circuits and ensuring that current is conserved at every point in the circuit. Kirchhoff's Current Law (KCL), also known as the Junction Rule, states that the sum of currents entering a junction in an electrical circuit must equal the sum of currents leaving the junction.

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The oscillation of an object on a frictionless surface is characterized by a constant amplitude, regular frequency, and a lack of energy loss due to the absence of friction.

In such a scenario, the object's motion continues indefinitely, maintaining its oscillatory pattern without any decay in amplitude. Friction is a force between two surfaces that are sliding, or trying to slide, across each other. For example, when you try to push a book along the floor, friction makes this difficult. Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down. The amount of friction depends on the materials from which the two surfaces are made.

So, The oscillation of an object on a frictionless surface is characterised by a constant amplitude, regular frequency, and a lack of energy loss due to the absence of friction.

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Answer:

Explanation:

Waves and wave functions are direct ways to graph vibrational motion. Specifically, for cases dealing with vibrating strings. If you were to move a tensioned string up and down with your arm, you would produce a wave with a given frequency, period, and amplitude.

To load test a lead-acid battery, a load of three times the ampere-hour rating is connected and the voltage is monitored. After a specific number of minutes, the voltage should be above a certain percentage of the rated voltage.

Lead-acid batteries are commonly used in vehicles, boats, and backup power systems. As these batteries age, their capacity may decrease, and it becomes essential to test their performance.

Load testing a battery involves connecting a load of three times the ampere-hour rating to it. This load puts a strain on the battery, simulating the conditions that it would face during use. The voltage of the battery is monitored during the test.

After a specific number of minutes, the voltage should be above a certain percentage of the rated voltage. The percentage threshold varies based on the application and the type of battery being tested.

In general, a voltage above 75% of the rated voltage is considered acceptable for lead-acid batteries.

If the voltage is below the threshold, the battery may need to be replaced or reconditioned. Overall, load testing is an essential maintenance task that helps ensure the reliability of lead-acid batteries.

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Based on scientific data, the stone is accelerated at approximately 10 \(m/s^2\).

Given the following data:

Gravity can be defined as a force of attraction that controls the movement of the planets such as Earth around the Sun.

This ultimately implies that, gravity is a universal force of attraction that acts between all objects or matter that are having both mass and energy, and can occupy space.

Furthermore, the gravity near the Earth's surface generally makes it possible for all physical objects such as stones to possess weight and experience a free fall.

According to astronomical records, the acceleration due to gravity for an object experiencing a free fall near the Earth's surface is 9.8 \(m/s^2\).

In this scenario, the stone is accelerated at approximately 10 \(m/s^2\).

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Answer:

If the ball is accelerating down through the air with no horizontal motion, the net forces acting on the ball must follow: C. The gravitational force is greater than the drag.

Explanation:

This is because the gravitational force is directed downward and the drag force opposes the direction of motion (therefore the drag force is directed upwards).  Since the ball is accelerating downwards, the gravitational force must be greater than the drag force in order to create this acceleration.

We know that the other options are incorrect because if the net force on the ball was directed upwards, the ball would be accelerating upwards.  If the net force on the ball was zero, the ball would not be accelerating at all.  If the drag was greater than the gravitational force, then the ball would be accelerating upwards as well.

Hope this helps!

Answer:

Im not a 100 percent sure but i thinks it za A

Explanation:

Alicia introduces the next advanced treatment protocol, which utilizes a high-powered device that uses intense pulses of electromagnetic radiation and a single wavelength at one time, and is called laser therapy.

The high-powered device that uses intense pulses of electromagnetic radiation and a single wavelength at one time is known as laser therapy. Laser therapy is a type of medical treatment that utilizes concentrated beams of light to relieve pain, inflammation, and accelerate the healing process.

The concentrated light beams generate heat, which is absorbed by the cells and tissues to help in the repair and healing of tissues. There are different types of laser therapies, and each type works differently to address various medical conditions.

However, they all utilize the same concept, which is the use of light beams to promote healing and tissue repair. Laser therapy has numerous benefits, including reducing inflammation, improving blood circulation, and promoting the healing process of wounds and tissue damage.

Additionally, it is a non-invasive treatment that does not require any surgical incisions, making it a suitable alternative to traditional surgical procedures. Some of the medical conditions that can be treated with laser therapy include musculoskeletal pain, back and neck pain, arthritis, and sports injuries.

The treatment is also effective in treating skin conditions such as acne, eczema, and psoriasis. However, laser therapy may not be appropriate for everyone, and it is essential to consult a healthcare provider before undergoing any medical treatment.

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Answer:

B. 24.2 m/s

Explanation:

Given;

mass of the roller coaster, m = 450 kg

height of the roller coaster, h = 30 m

The maximum potential energy of the roller coaster  due to its height is given by;

\(P.E_{max} = mgh\\\\PE_{max} = 450 *9.8*30\\\\PE_{max} = 132,300 \ J\)

\(P.E_{max} = K.E_{max} \ (law \ of \ conservation\ of \ energy)\)

\(K.E_{max} = \frac{1}{2}mv_{max}^2\\\\ v_{max}^2 = \frac{2K.E_{max}}{m}\\\\ v_{max}^2 = \frac{2*132300}{450}\\\\ v_{max}^2 =588\\\\v_{max} = \sqrt{588}\\\\ v_{max} = 24.2 \ m/s\)

Therefore, the maximum speed of the roller coaster is 24.2 m/s.

Answer:

1. 24.2 m/s

2. 20.4 m

3. 22.5 m/s

4. 109,375 J

5. It is easy to calculate new scenarios.

Explanation:

5/5 on the Maximum Energy Quick Check

As the two socks are being spun too slowly, they are probably not going to stick together since the static charge would be too small to cause them to adhere.  

An imbalance in the charged particles of the thing is what causes static electricity, according to this definition. Until they are released or discharged, these charges remain on the object's surface. Static electricity is produced at the surface of the object as a result of these charges.

When a dryer's electricity supply is turned on, clothing spin faster and become stuck to one another, creating friction force between them. When the supply gets off, the spinner stopped its movement and the result is the static electricity that causes the socks to stuck together.

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The orbital period of the satellite circling the Earth at an altitude of 3500 km is 163 minutes

The orbital period for the satellite circling the Earth at an altitude of 3500 km can be obtained as follow:

T² = (4π² / GM) × a³

T² = [(4 × 3.14²) / (6.67×10¯¹¹ × 5.987×10²⁴)] × 9900000³

Take the square root of both sides

T = √[((4 × 3.14²) / (6.67×10¯¹¹ × 5.987×10²⁴)) × 9900000³]

T = 9789.15 s

Divide by 60 to express in minutes

T = 9789.15 / 60

T = 163 minutes

Thus, we can conclude that the orbital period of the satellite is 163 minutes

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The total energy of a ball stays constant as it is thrown upward because potential energy increases while kinetic energy decreases. When the ball reaches its maximum height, the velocity is zero. Therefore, only potential energy exists rather than kinetic energy.

The thrower's movement imparts kinetic energy to a ball thrown vertically. The maximum height that can be achieved after leaving the hand will depend on the actual velocity. Air resistance causes some of this energy to be lost to the air as frictional dissipation, which warms the air in the area as well as the ball's surface.

We can just talk about how the ball moves when it is in the gravitational field of the Earth if we ignore this for the purposes of this discussion. The ball's total energy as it is released is comprised of both its gravitational potential energy and its kinetic energy, which result from the ball's velocity (due to its position).

The gravitational potential energy begins to rise as the ball moves vertically upward at precisely the same pace as it loses kinetic energy. The ball experiences a steady downward acceleration of 9.81 m/s2, which causes it to initially decline until it briefly comes to a stop at its highest point.

Due to its current position in the Earth's gravitational field relative to its initial position, all of the energy at this point is gravitational potential energy. As the ball experiences constant downward acceleration, its motion immediately becomes apparent in that direction because the acceleration easily transforms gravitational potential energy back into kinetic energy.

As a result, at every point along the trajectory, the total of these interchangeable forms of energy remains constant.

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Answer:

C

Explanation:

The substances are changed.

A chemical equation describes a chemical reaction. Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation .

Answer:

对不起，我不知道对不起

Explenation:

The net force acting on the body is 45 N

Force is a vector, vectors are quantities that have both magnitude and direction. We must take the direction of the vector into account when computing the net force.

Since the two forces act in opposite directions, the net force is; 55 N - 10 N = 45 N.

The direction of this force is towards the 55 N force which is the larger force.

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The dimension of the cylinder will be r = 8.92 cm and h = 17.86 cm.

What is dimensions?

An item, region, or space's dimensions are its size or distance from another point in space. The metric of anything's length, width, and height can be put more simply.

Length and Breadth are  a common way to convey dimensions. 

Main body:

Volume of cylinder, \(v = \pi r^{2}h\)

Surface area = \(2\pi r^{2} + 2\pi rh\)

given surface area = \(1500 cm^{2}\)

\(h=(750/\pi r)-r ---(1)\)

V = \(\pi r^{2}\left \{ {(750/\pi r)-h\)

V = 750-3\(\pi r^{2}\)

put V' = 0

0 = 750-3\(\pi r^{2}\)

r≈ 8.92 cm

By substituting the value of r in eq (1)

we get h = 17.86 cm

therefore, the dimension of cylinder are r = 8.92 cm and h = 17.86 cm

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Explanation:

a ray of light pass through raindrops which acts like prism and split the light into its 7 constituent...which when seen by our eyes , we presume it to be a rainbow

To determine the greatest angle of refraction that can occur when a light ray in water (with an index of refraction of n = 1.33) enters glass (with an index of refraction of n = 1.60), we can use Snell's law of refraction:

n1 * sin(θ1) = n2 * sin(θ2)

where n1 and n2 are the indices of refraction of the initial and final mediums, respectively, θ1 is the angle of incidence, and θ2 is the angle of refraction.

Given:

n1 (water) = 1.33

n2 (glass) = 1.60

We want to find the greatest angle of refraction, which means we need to find the maximum value of sin(θ2). In order to maximize sin(θ2), we need to minimize the value of sin(θ1).

The critical angle (θc) is the angle of incidence at which the refracted ray would have an angle of refraction of 90 degrees (sin(θ2) = 1). When the angle of incidence exceeds the critical angle, total internal reflection occurs.

To find the critical angle, we rearrange Snell's law as follows:

sin(θ1) = n2 / n1

Substituting the given values:

sin(θ1) = 1.60 / 1.33 ≈ 1.203

To find the greatest angle of refraction, we need to find the complement of the critical angle:

θc = sin^(-1)(1.203) ≈ 51.3 degrees

Therefore, the greatest angle of refraction that can occur when a light ray in water enters glass is approximately 51.3 degrees.

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The wavelength of the photon emitted when the electron undergoes a transition from the first excited level to the ground level is 333 nm.

The energy difference between the first excited level and the ground level is given by the equation ∆E = (n²h²)/8mL², where n = 2, m is the mass of an electron, L is the width of the box, and h is Planck's constant. Substituting the given values, we get ∆E = 4.96 x 10⁻²⁰ J. The energy of the photon emitted is equal to this energy difference, so we have E = ∆E = hc/λ, where c is the speed of light and λ is the wavelength of the photon. Solving for λ, we get λ = hc/∆E = 333 nm. Therefore, the wavelength of the photon emitted when the electron undergoes a transition from the first excited level to the ground level is 333 nm.

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Answer:

sa64

Explanation:

Based on the circled elements in the periodic table’s location, we could infer that most of the circled elements are gases at room temperature. The correct answer is B.

There are 11 elements that are in gaseous state at room temperature. They are Hydrogen (H), Helium (He), Neon (N), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn), Fluorine (F), Chlorine (Cl), Nitrogen (N) and Oxygen (O).

Elemental hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and also are found as diatomic molecules (H2, N2, O2, F2, Cl2).

Although part of your question is missing, you might be referring to this full question: Consider the circled elements in the periodic table as seen on attached image. Based on their location, we could infer that most of them are:

A) very reactive gases.

B) gases at room temperature.

C) do not react readily with metals.

D) nonreactive solids at room temperature.

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Given data

*The given radius of the wheel is r = 30.0 cm = 0.30 m

*The given angle of the wheel rotates in 1.00 s is

*The angular velocity of the wheel is

The formula for the linear speed of a point on the wheel's rim is given as

Substitute the known values in the above expression as

Hence, the linear speed of a point on the wheel's rim is v = 53.4 m/s

The formula for the wheel's frequency of rotation is given as

Substitute the known values in the above expression as

Hence, the wheel's frequency of rotation is f = 28.34 Hz

Answer:

λ = V T        S is distance between wavefronts, T is period of emitter

λ  = 3.00E8 m/s * 1 / 2.40E10 = .0125 m    

λ emitted by speed gun = .0125 m

But gun moves Vg * T     between wavefronts

λ' = λ - Vg T where λ' is wavelength received by stationary observer

One can calculate T' from 3.00E8 m/s the period seen by observer, that is the period measured by the observer is the speed of light divided by the wavelength received by the observer

Now if the observer is moving the wavelength observed by the observer is λ'' = λ'  - Vo T' since the observer will move a distance Vo T' between receiving wavefronts (T' has been calculated)

That is, the waves received by the tennis ball are shortened because of the motion of the tennis ball.

The  speed of the wave measured is always 3.00E8 m/s

Answer:

ohohoh

Explanation:

c

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

where

f is the force

m is the mass

From the question we have

\(a = \frac{20}{5} \\ \)

We have the final answer as

Hope this helps you

Answer: Diagram B

Explanation:

A free body diagram shows the forces acting on an object in a certain scenario.

In this scenario there are two forces acting on the carrot: the Tension force (Ft) from the rope that the carrot is hanging from and Gravitational force(Fg) which is pulling the carrot to the Earth.

The diagram depicting this is diagram B.

Answer:

ft and fg

Explanation:

If a solid is heated at a pressure below its triple point pressure, it will undergo a transition to a gas state without passing through a liquid phase.

This transition is known as sublimation. Sublimation occurs when the vapor pressure of a solid is greater than the external pressure exerted on it.

As the solid is heated, its molecules gain energy and vibrate more rapidly, eventually breaking their bonds and escaping the solid as gas molecules.

The rate of sublimation depends on factors such as temperature, pressure, and the surface area of the solid. Sublimation is a common phenomenon observed in dry ice, mothballs, and frozen foods. Understanding sublimation is essential in various fields, such as material science, physics, and chemistry.

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