An electron traveling with speed v around a circle of radius r is equivalent to a current of:


evr/2


ev/r


ev/2πr


2πer/v


2πev/r

Work needed = 23,520 J

Given

height = 12 m

mass = 200 kg

Required

work needed by the crane

Solution

Work is the transfer of energy caused by the force acting on a moving object  

Work is the product of force with the displacement of objects.  

Can be formulated  

W = F x d  

W = Work, J, Nm  

F = Force, N  

d = distance, m  

F = m x g

Input the value :

W = mgd

W = 200 kg x 9.8 m/s²x12 m

W = 23520 J

I would be happy to help you fill in the blanks. However, without knowing what the blanks are and what context they are in, it is difficult to provide a meaningful response. Therefore, I suggest you provide more information so that I can understand the context and provide a relevant answer.

In general, when filling in blanks, it is important to consider the context and use your knowledge and understanding of the topic to provide an accurate response. Additionally, it is crucial to ensure that the filled-in words or phrases are grammatically correct and make sense in the context of the sentence or paragraph.

In writing a paragraph, it is essential to have a clear and concise topic sentence that summarizes the main idea of the paragraph. The following sentences should support and expand on the main idea, providing evidence, examples, or explanations. It is also important to use transitional words and phrases to connect the sentences and make the paragraph flow smoothly.

In summary, when filling in blanks or writing paragraphs, it is essential to consider the context, use your knowledge and understanding, and ensure that the responses are grammatically correct and make sense in the context of the sentence or paragraph.

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Answer:

2(3t-4)+3t=4t-2

This deals with linear equations with one unknowns

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Answer:

Plzzzz answer fast......

Answer: A standard 9V battery has about 400-600 mAh capacity. In the most basic terms, these batteries can supply about 500 milliamps for one hour before being "dead". With electricity, we measure the amount of charge flowing through the circuit over a period of time. Current is measured in Amperes (usually just referred to as "Amps"). An ampere is defined as 6.241*10^18 electrons (1 Coulomb) per second passing through a point in a circuit. In a series circuit, amperage, or amplitude, of the current remains constant and can be calculated using Ohm's law V = I/R while the voltage drops across each resistor that can be summed up to get the total resistance.

Hope this helps........ Stay safe and have a Merry Christmas!!!!!!!! :D

Answer: A & B

Explanation:

Took The test

\(FeS_2\) is the limiting reactant and \(O_2\) is the excess reactant and 160.14 grams of \(SO_3\) are produced.

Given equation is: \(4FeS_2 + 15O_2 = 2Fe_2O_3 + 8SO_3\)

Calculating molar mass of \(FeS_2\), \(O_2\), \(Fe_2O_3\) and \(SO_3\)

We have: molar mass of \(FeS_2\) = 55.85 g/mole + 2(32.07 g/mole) = 119.99 g/mole

molar mass of \(O_2\) = 2(16.00 g/mole) = 32.00 g/mole

molar mass of \(Fe_2O_3\) = 2(55.85 g/mole) + 3(16.00 g/mole) = 159.69 g/mole

molar mass of \(SO_3\) = 3(16.00 g/mole) + 32.07 g/mole = 80.07 g/mole

We will use the balanced chemical equation to determine the limiting reactant: \(4FeS_2 + 15O_2 -- > 2Fe_2O_3 + 8SO_3\)

We will calculate the number of moles of each reactant.

moles of \(FeS_2\) = mass/molar mass = 20.0 g/119.99 g/mole = 0.1667 moles

moles of \(O_2\) = mass/molar mass = 16.0 g/32.00 g/mole = 0.5000 moles

According to the balanced equation, 4 moles of \(FeS_2\) react with 15 moles of \(O_2\) to produce 8 moles of \(SO_3\)

So, 1 mole of \(FeS_2\) reacts with (15/4) moles of \(O_2\) to produce (8/4) moles of \(SO_3\).

The balanced chemical equation tells us that the mole ratio of \(FeS_2\) to \(O_2\) is 4:15 and that of \(FeS_2\) to \(SO_3\) is 4:8 or 1:2.

The limiting reactant is \(FeS_2\) which means that it will react with 15/4 moles of \(O_2\) and produce 8/4 = 2 moles of \(SO_3\).

The number of moles of \(SO_3\) produced is given as follows:

moles of \(SO_3\) = 2 molg = moles × molar mass = 2 mol × 80.07 g/mol = 160.14 g

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The velocity of the wind that is affecting the plane relative to the observer is 5.5 m/s north.

Option A is the correct answer.

The velocity of the wind relative to the observer is the velocity of the wind measured from the observer as a frame of reference.

The relative velocity of the plane from the observer as the frame of reference is calculated as follows;

Vr² = Vp² + Vw²

where;

The given parameters;

Vr² = Vp² + Vw²

Vr = √(Vp² + Vw²)

Vr = √(45.8² + 40.3²)

Vr = 61 m/s

The velocity of the wind that is affecting the plane relative to the observer is calculated as follows;

Vo = 45.8 m/s north - 40.3 m/s south = 5.5 m/s north

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Answer:

Scientists classify stars based on three main characteristics: main sequence, spectrum, and light year. The main sequence of a star refers to its position on the Hertzsprung-Russell diagram, which plots the luminosity of a star against its surface temperature. Stars that fall on the main sequence are considered to be "normal" stars and are burning hydrogen in their core to produce helium. The spectrum of a star refers to the light it emits, which can be analyzed to determine its composition, temperature, and motion. Stars are classified based on their spectra into different spectral types, such as O, B, A, F, G, K, and M. Lastly, the light year is a unit of measurement used to express astronomical distances and is equal to the distance that light can travel in one year, which is about 5.88 trillion miles (9.46 trillion kilometers). Using these three characteristics scientists can classify stars into different groups and understand the properties of the star and its evolutionary stage.

Explanation:

Scientists use various characteristics to classify stars and understand their properties and evolutionary stage. One of the main characteristics used is the main sequence of a star, which refers to its position on the Hertzsprung-Russell diagram. This diagram plots the luminosity of a star against its surface temperature, and stars that fall on the main sequence are considered to be "normal" stars that are burning hydrogen in their core to produce helium.

Another characteristic used to classify stars is the spectrum of a star, which refers to the light it emits. By analyzing the spectrum of a star, scientists can determine its composition, temperature, and motion. Based on the spectral features, stars are classified into different spectral types, such as O, B, A, F, G, K, and M. Each spectral type has unique characteristics, such as temperature, luminosity and chemical composition.

Lastly, scientists use the light year as a unit of measurement to express astronomical distances. A light year is the distance that light can travel in one year, which is about 5.88 trillion miles (9.46 trillion kilometres). This unit is useful for understanding the distance between stars and galaxies, as well as the relative ages of different stars.

By using these three characteristics, scientists can classify stars into different groups, understand their properties, and deduce information about the star's evolutionary stage. This knowledge can help scientists understand the formation and evolution of stars and galaxies, as well as the universe as a whole.

Answer:

I hope this helps. Plzz mark as brainliest

Explanation:

A man walking at the rate of 5 km/hr. crosses a bridge in 15 minutes. The length of the bridge (in meters) is:

[A]1000 m

[B]1250 m

[C]600 m

[D]750 m

1250 m

Speed of the man = 5 km/hr



Time taken to cross the bridge = 15 minutes

Length of the bridge = Speed  Time



Hence option [B] is the right answer.

Answer:

it A.

Explanation:

did the test on Edmentum and got it right

The approximate TOD of the victim is Maybe around 4:30 pm.

The liver temperature can provide a more accurate representation of the genuine core body temperature, hence it is ideal to take the temperature either rectally or by monitoring the liver temperature.To do this, a tiny incision must be made in the right upper belly, and the thermometer must be inserted into the liver tissue.

This stiffening process, known as rigor mortis, occurs at a fairly known time, making it possible to predict when someone will pass away.In overall: If the body is warm and there is no rigidity, the time of death was less than three hours ago.If the body is stiff and warm, death happened 3 to 8 hours earlier.

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Answer:

Use the method on the image and solve it.

The train is accelerating with an initial velocity of 23 m/s, a final velocity of 190 m/s in the time period of 54 seconds, then the acceleration will be 3.09 m/s².

Velocity is the measurement of a particle's or object's displacement with relation to time. The recognized unit of magnitude for velocity is the meter per second (m/s) (also known as speed).

There are several ways to show a velocity vector's direction, depending on how many dimensions are provided.

The given values in the question are,

Initial velocity, u = 23 m/s

Final velocity, v = 190 m/s and,

Time, t =54 seconds.

By putting the formula of the equation of motion :

v = u + at

190 = 23 + (a)(54)

a = 167/54

a = 3.09 m/s².

Hence, the acceleration of the train is equal to 3.09 m/s².

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Answer:

Capacidad de almacenamiento ofrecida por los DVD

Hay que mencionar que es posible conseguir DVD de una o dos capas. Los DVD que cuentan con una capa son capaces de almacenar aproximadamente 4.7GB de datos, mientras que los de doble capa ofrecen la posibilidad de almacenar alrededor de 8.5GB

Explanation:

Answer:

4 layers

Explanation:

i took the quiz

The spectrum observed from the Sun (or any star) would exhibit an absorption spectrum. This is because the outer gaseous atmosphere of the star absorbs specific wavelengths of light, resulting in dark absorption lines in the spectrum.

In the cooler, lower-density outer atmosphere, where white light from the star travels, some atoms or molecules in the atmosphere absorb photons with particular energy. In the spectrum, these absorptions show up as black lines at specific wavelengths. The specific set of absorption lines that each element or molecule generates results in a distinctive pattern that can be used to identify the elements that are present in the star's atmosphere.

The absorption spectrum offers insightful data on the chemical make-up and physical characteristics of the star. Astronomers can ascertain the elements present, their abundances, and other characteristics like the temperature, pressure, and velocity of the star's atmosphere by examining the absorption lines.

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Answer: The anser is C

Explanation:

It is the same if no external forces are added.

Based on the principle of conservation of linear momentum, the final total momentum of both carts compared to the initial total momentum is the same if no external forces are added.

The given information;

According to the principle of conservation of linear momentum, the total momentum before collision is equal to the total momentum after collision.

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

where;

Thus, based on this principle (conservation of linear momentum), the final total momentum of both carts compared to the initial total momentum is the same if no external forces are added.

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The value of force is 1.7 × 10⁻³ N, with the direction opposite to that of the bat's motion.

When an object collides with another object, they exchange energy. For example, a baseball and bat collision or a car collision. When two objects collide, the force of the collision has to be equal on both sides of the collision according to Newton's Third Law. So, to find the value of force, we will apply the equation:

F = ΔP / ΔT

where F is the force, ΔP is the change in momentum, and ΔT is the time of collision. The equation represents the impulse momentum theorem.

Now, let's apply the given values to the above equation.

Final momentum (p2) = mass × final velocity (v2)

p2 = 0.15 kg × (-50 m/s)

p2 = -7.5 kg.m/s

Initial momentum (p1) = mass × initial velocity (v1)

p1 = 0.15 kg × (40 m/s)

p1 = 6 kg.m/s

Change in momentum (ΔP) = p2 - p1

ΔP = -7.5 kg.m/s - 6 kg.m/s

ΔP = -13.5 kg.m/s

Time of collision (ΔT) = 8.0 × 10³ s

Now, putting the values of ΔP and ΔT in the equation of impulse momentum theorem, we get:

F = ΔP / ΔT

F = -13.5 kg.m/s ÷ 8.0 × 10³ s

F = -1.7 × 10⁻³ N

Thus, the value of force is 1.7 × 10⁻³ N, with the direction opposite to that of the bat's motion.

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Given two objects of the same mass but of different sizes, the one that has a greater density is: a. the smaller object

Due to the density of an object is the relation that exist between the mass and the space that the object occupies, if we have two objects with the same mass the one that is going to have a greater density is the smaller object because it occupies less space with more mass.  

We can prove it using the density formula to solve the following exercise:

Two objects have a mass of  100 g, and their volume are 20 cm³ and 10 cm³ respectively, what is the density of each one?

The general formula of the density is:

d = m/v

Where:

Information about the problem:

Applying the density  formula we get:

d = m/v

d1 = 100g/20 cm³

d1 = 5g/cm³

d2 = 100g/10 cm³

d2 = 10g/cm³

With the results we can confirm that the object that has the greater density is the smaller, because it has less volume.

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Answer:

A newspaper is a serial publication which contains news on current events of special or general interest.

Answer/Explanation:

Newspapers are generally published daily, weekly, and bi-weekly, although they may have less regular publication schedules. A regularly published collection of fairly brief articles that provide updates on current events and interests.

It will take approximately 31.11 seconds for a 2000-watt motor to lift a 370-kg piano to a sixth-story window 17.0  meters above the ground.

A 2000-watt motor is used to lift a 370-kg piano to a sixth-story window 17.0 meters above the ground. To calculate the time it takes, we first need to find the work done and then divide it by the power of the motor.

Work done (W) can be calculated using the formula W = m * g * h, where m is the mass (370 kg), g is the gravitational acceleration (approximately 9.8 m/s²), and h is the height (17.0 m). So, W = 370 kg * 9.8 m/s² * 17.0 m = 62,218 J (joules).

Now we have the work done and the power of the motor, which is 2000 watts (W). Time (t) can be calculated using the formula t = W / P, where P is the power. So, t = 62,218 J / 2000 W = 31.11 seconds.

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The fluid boundary layer at a distance of 0.5 m from the leading edge would be larger than the surface roughness. This is because the boundary layer thickness increases as the fluid flows further along the flat plate. The head loss across the plate would be affected by this larger boundary layer, potentially leading to increased resistance and higher pressure drop.

The head loss across the plate would be very small, since the fluid flow is still laminar and the boundary layer thickness is much smaller than the surface roughness. The head loss is dominated by the viscous effects in the fluid, and can be neglected for most practical purposes.

The fluid boundary layer is defined as the thin layer of fluid adjacent to the solid surface of an object, such as a flat plate, where the flow is influenced by the viscosity of the fluid. The thickness of this boundary layer increases with the distance from the leading edge of the plate. To determine if the fluid boundary layer at a distance of x = 0.5 m from the leading edge would be less than that of the surface roughness, we need to calculate the thickness of the boundary layer and compare it to the surface roughness. We can use the formula for the boundary layer thickness for laminar flow over a flat plate, given byδ = 5.0x / (Re_x^(1/2)), where δ is the boundary layer thickness, x is the distance from the leading edge of the plate, and Re_x is the Reynolds number at the point x.

The Reynolds number is defined as Re_x = (ρv x) / μwhere ρ is the density of the fluid, v is the velocity of the fluid, x is the distance from the leading edge of the plate, and μ is the dynamic viscosity of the fluid. Substituting the given values, we get Re_x = (ρv x) / μ = (1000 kg/m³ x 2.5 m/s x 0.5 m) / 1.053 x 10^(-6) m²/s = 1.185 x 10^9Using this value of Re_x in the formula for the boundary layer thickness, we getδ = 5.0x / (Re_x^(1/2)) = 5.0 x 0.5 / (1.185 x 10^9)^(1/2) = 1.24 x 10^(-6) m. Therefore, the fluid boundary layer thickness at a distance of x = 0.5 m from the leading edge of the plate is much smaller than the surface roughness of ε = 0.046 mm.

This means that the fluid flow over the plate is still considered to be laminar, and the head loss across the plate can be calculated using the formula for the Darcy- Weisbach friction factor,f_D = 16 / Re_xwhere f_D is the friction factor. The head loss is then given byh_L = f_D (L/D) (v²/2g)where L is the length of the plate, D is the hydraulic diameter of the flow channel, v is the velocity of the fluid, and g is the acceleration due to gravity.

Since the flow is laminar, the friction factor can be calculated using the formula, f_D = 64 / Re_x Substituting the given values, we get, Re_x = 1.185 x 10^9 and D = 4ε = 0.184 mm = 1.84 x 10^(-4) m. Therefore,f_D = 64 / Re_x = 64 / 1.185 x 10^9 = 5.4 x 10^(-8)and h_L = f_D (L/D) (v²/2g) = (5.4 x 10^(-8)) x (1 m / 1.84 x 10^(-4) m) x (2.5 m/s)² / (2 x 9.81 m/s²) = 7.0 x 10^(-6) m.

Therefore, the head loss across the plate would be very small, since the fluid flow is still laminar and the boundary layer thickness is much smaller than the surface roughness. The head loss is dominated by the viscous effects in the fluid, and can be neglected for most practical purposes.

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Answer:

it = 5.5e-5 cm

just tyoe in on the search bar nm to cm and a calculatro comes up

Explanation:

The net torque on each wheel of the bicycle is -0.27 Nm.It is important to note that the negative sign indicates that the torque is in the opposite direction to the motion of the wheel.

To find the net torque on each wheel of a bicycle slowing down with an angular acceleration of -15 rad/s², we can use the formula for torque:

τ = Iα

Where τ is the net torque, I is the moment of inertia, and α is the angular acceleration.

We are given the mass and radius of each wheel as 0.4 kg and 0.3 m, respectively, and the angular acceleration as -15 rad/s². The moment of inertia of a solid cylinder is:

I = 1/2 mr²

Substituting the given values, we get:

I = 1/2 × 0.4 kg × (0.3 m)² = 0.018 kg m²

We can now calculate the net torque using the formula:

τ = Iα

Substituting the given values, we get:

τ = 0.018 kg m² × (-15 rad/s²) = -0.27 Nm.

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Answer:· Relationship between Energy Transferred, Current, Voltage and Time. The potential difference or voltage, V across two points is defined as the energy, E dissipated or transferred by a coulomb of charge, Q that moves through the two points. Therefore, potential difference, Current is the rate of charge flow.

Explanation:

Relationship between Time, Current, Voltage, and Transferred Energy The energy, E, dissipated or transferred by a coulomb of charge, Q, which passes through the two places, is described as the potential difference or voltage, V across two points.

An electric circuit, also known as an electrical circuit, is a conductor used to move current or electricity. To connect the source of power to the load, a conductive wire is utilized. Between the supply and the load, an ON/OFF switch and a fuse are also employed.

The rate of charge flow is therefore determined by potential difference and current.

A circuit is said to be open when an electrical line, electronic device, or switch is malfunctioning or when the switch is off. You can see in the diagram below that the bulb is not lighting because either the switch is turned off or an electrical line is faulty.

Therefore, Relationship between Time, Current, Voltage, and Transferred Energy The energy, E, dissipated or transferred by a coulomb of charge, Q, which passes through the two places, is described as the potential difference or voltage, V across two points.

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To plot the V-I (voltage-current) curve using Table-II values, organize the data into two columns: one for voltage (V) and one for current (I). Plot the voltage values on the x-axis and the corresponding current values on the y-axis. Connect the plotted points with a line to form the V-I curve, representing the relationship between voltage and current.

To determine the voltage, current, and load resistance required for maximum power transfer, examine the V-I curve. Identify the point where the product of voltage and current (P = V * I) is maximum. This point represents the maximum power transfer. Note the voltage and current values at this point.

To calculate the load resistance, use the formula R = V^2 / P, where R is the load resistance, V is the voltage at the maximum power point, and P is the maximum power. Substitute the values and calculate the load resistance required for maximum power transfer.

By finding the voltage, current, and load resistance at the maximum power point, you can determine the values needed to achieve maximum power transfer in the circuit.

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Answer:

As the temperature is increased the more the energy store

The altitude of the satellite is 883.89 km

Generally, The Rayleigh criterion for resolution states that the minimum angle, θ, between two point sources that can be resolved is given by:

θ = 1.22 * λ / D

where

λ is the wavelength of light and

D is the diameter of the lens.

The minimum distance, d, between two point sources that can be resolved is given by:

d = θ * L

where

L is the distance from the lens to the image.

Given the green lights have a wavelength of 508 nm, we can convert it to meters:

λ = 508 * 10^-9 m

Given the diameter of the lens is 49.8 cm, we can convert it to meters:

D = 49.8 cm * (1 m / 100 cm)

= 0.498 m

Using the Rayleigh criterion, we can find the minimum resolvable angle:

θ = 1.22 * λ / D

= 1.22 * 508 * 10^-9 / 0.498

= 1.24449799*10^{-6} radians

We know the lights on the satellite are spaced 1.1 m apart, so:

d = 1.1 m

Solving for the distance from the lens to the image, L:

L = d / θ

= 1.1 m / 1.24449799*10^{-6} radians

=883890.53 m

Finally, converting the distance to kilometers:

L = 883890.53 m * (1 km / 1000 m)

= 883.89 km

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