Estimate 7 7/9 x 6 7/9 to the nearest whole number

Answer:

The answer is thallium.

Explanation:

Consider the pseudo code below, the output when input is "NCUCSIE" is (A) NCUCSIENCUCSIE.

The given pseudo code has a loop that iterates through each character of the given input and constructs a new string by adding each character twice. The output will therefore be a string that has each character repeated twice. For the given input "NCUCSIE", the output will be "NCUCSIENCUCSIE". Here is a step-by-step explanation of how the code works: Take input from the user. In this case, the input is "NCUCSIE".

Initialize an empty string called "result", literate over each character of the input string one by one. For each character, append it to the result string twice using the concatenation operator "+=". When all characters have been processed, the result string will contain each character repeated twice, output the result string. The correct answer for the given question is option (A) NCUCSIENCUCSIE.

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The material with the lowest refractive index is air. The correct option is D. Air.

Light waves are a type of electromagnetic wave that travel through space at the speed of light.

In this case, the light wave is traveling through glass and then strikes the boundary with a second medium at a 45° angle, refracting away from the boundary. For the light wave to refract away from the boundary, the second medium must have a lower refractive index than glass.

Out of the options given, the material with the lowest refractive index is air. Therefore, the correct answer is D. Air.

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The direction of the induced current in the wire loop is anti-clockwise.

The direction of the induced current if the wire loop was on the left side of the wire is clockwise.

Lenz's law and the direction of the induced current are the key concepts needed to address this issue.

To determine the direction of the induced current under various circumstances, use Lenz's law.

The induced emf of the coil is proportional to the negative of the rate of change of magnetic flux, according to Faraday's law.

The following expression represents the typical emf that is generated in the coil during the course of the time period: \($$\varepsilon=-\frac{\Delta \Phi}{\Delta t}$$\)

Here, \($\varepsilon$\) is the average emf that is induced in the coil during the time interval and \($\Delta \Phi / \Delta t$\) is the rate of change of magnetic flux.

A magnetic field is induced in the rectangular loop as a result of the current in the wire. The plane is the intended target of this magnetic field.

As the current in the wire grows, the magnetic flux in the rectangular coil rises.

An emf and current are induced by Faraday's law.

Following is noted from Lenz's law:

The inwards growing flux is opposed by the generated current. Therefore, the induced current must flow counterclockwise in order to meet this.

When the rectangular loop is kept to the left of the wire, the magnetic flux will be directed outward.

If the wire loop was on the left side of the wire, the induced current would flow clockwise.

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Answer:

Hey!

Your answer is A) TRUE!

Explanation:

The electricity in this instance is called "grid-electricity" because it has come from a generation plant elsewhere instead of recharging the batteries via Kinetic/Potential energy...

Answer:

b

Explanation:

The warning would alert the people and give them time to prepare for the tornado. like getting food and going in bunkers

Brainliest awnser?

Answer:

i would have to say b

Explanation:

option A seems great, but we never know where the tornado will go, it could move, and while C seems sensible, i would think people would rather get food and water and run to the shelter and D doesnt make any sense, it is a tornado, it will tear your doorway

Answer:

The volume is 160

Explanation:

because, 8 times 2 times 10 = 160

Explanation:

160 cm

l x w x h

8 x 2 x 10 = 160 cm

the volume is 160 cm

For, the resistances are related by:
R_A/R_B = L_A/L_B = 2
Since R_A = 8R_ B is the only choice that satisfies this equation, the answer is: a. R_A = 8R_B

To solve this problem, let's consider the properties of cylindrical copper wires, mass, and resistances.

Given that both wires have the same mass, and Wire A is twice as long as Wire B, we can say:
Length of Wire A = 2 * Length of Wire B

Since the mass is the same for both wires, we can express the mass in terms of volume and density:

mass = volume * density

For cylindrical objects, the volume can be expressed as:
volume = π * radius² * length

Since both wires have the same mass and are made of copper, their density is also the same. Let's set their volumes equal:

π * radius_A² * length_A = π * radius_B² * length_B

Now, let's use the fact that length_A = 2 * length_B:

π * radius_A² * 2 * length_B = π * radius_B² * length_B

Divide both sides by (π * length_B) to isolate the radii:

2 * radius_A² = radius_B²

Now let's find the resistances using the formula for the resistance of a cylindrical wire:

R = ρ * (length / (π * radius²)), where ρ is the resistivity of the material.

For Wire A, we have:

R_A = ρ * (2 * length_B / (π * radius_A²))

For Wire B, we have:

R_B = ρ * (length_B / (π * radius_B²))

Now, let's find the relation between R_A and R_B. Divide R_A by R_B:

R_A / R_B = (ρ * (2 * length_B / (π * radius_A²))) / (ρ * (length_B / (π * radius_B²)))

Cancel out the ρ and length_B:

R_A / R_B = (2 / (radius_A²)) / (1 / (radius_B²))

Now let's recall that 2 * radius_A² = radius_B²:

R_A / R_B = (2 / (radius_A²)) / (1 / (2 * radius_A²))

Simplify:

R_A / R_B = (2 * (2 * radius_A²)) / (radius_A²) = 4

So, the correct answer is:

R_A = 4R_B, which is option b.

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Answer:

v = 15.23 m/s

Explanation:

Given that,

Mass of a car, m = 1110 kg

Initial velocity, u = 21 m/s

Force,F = -8000 N

Time, t = 0.9 s

We need to find the final velocity of the car.

Force, F = ma

\(F=\dfrac{m(v-u)}{t}\\\\v-u=\dfrac{Ft}{m}\\\\v=\dfrac{Ft}{m}+u\\\\v=\dfrac{-8000\times 0.8}{1110}+21\\\\v=15.23\ m/s\)

So, the final velocity of the car is 15.23 m/s.

Answer:

Yes you are using energy to carry that thing.(Force is applied)

Explanation:

Bulbs 2 and 3 will go out, but bulb 1 will remain lit

A parallel connection is a type of electrical connection in which multiple components or devices are connected side by side across the same two points of a circuit, such as two terminals of a battery or power source. In a parallel connection, each component has its own path to the power source, which means that the voltage across each component is the same.

In a parallel connection, the overall resistance of the circuit decreases as more components are added, which means that the total current drawn from the power source increases.

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Answer:

How much is the mass of man?

Answer:

Si un objeto se mueve en relación a un marco de referencia (por ejemplo, si una profesora se mueve a la derecha con respecto al pizarrón, o un pasajero se mueve hacia la parte trasera de un avión), entonces la posición del objeto cambia. A este cambio en la posición se le conoce como desplazamiento. La palabra desplazamiento implica que un objeto se movió, o se desplazó.

Explanation:

El desplazamiento se define como el cambio en la posición de un objeto. Se puede definir de manera matemática con la siguiente ecuación:

\text{desplazamiento}=\Delta x=x_f-x_0desplazamiento=Δx=x  

f

​  

−x  

0

​  

start text, d, e, s, p, l, a, z, a, m, i, e, n, t, o, end text, equals, delta, x, equals, x, start subscript, f, end subscript, minus, x, start subscript, 0, end subscript

x_fx  

f

​  

x, start subscript, f, end subscript se refiere al valor de la posición final.

x_0x  

0

​  

x, start subscript, 0, end subscript se refiere al valor de la posición inicial.

\Delta xΔxdelta, x es el símbolo que se usa para representar el desplazamiento.

Debemos ser cuidados al usar la palabra distancia, ya que hay dos maneras de usar el término en física. Podemos hablar acerca de la distancia entre dos puntos, o podemos hablar de la distancia recorrida por un objeto.

La distancia se define como la magnitud o el tamaño del desplazamiento entre dos posiciones. Observa que la distancia entre dos posiciones no es la misma que la distancia recorrida entre ellas.

Es importante darse cuenta que la distancia recorrida no tiene que ser igual a la magnitud del desplazamiento (es decir, la distancia entre dos puntos). De manera específica, si un objeto cambia de dirección en su trayecto, la distancia total recorrida será mayor que la magnitud del desplazamiento entre esos dos puntos. Ve los ejemplos resueltos a continuación.

The angle θ0 at which the electron is incident between the two plates, we can use the relationship θ0 = arctan(E * L / (2d)).

determine the angle θ0 at which the electron is incident between the two plates, we can consider the forces acting on the electron due to the electric field.

The electric field between the plates is directed from left to right. The force experienced by the electron due to the electric field is given by the equation:

F = q * E

where F is the force, q is the charge of the electron, and E is the electric field strength.

Since the electron is negatively charged, it experiences a force in the opposite direction to the electric field. This force will cause the electron to accelerate in the opposite direction.

When the electron enters the region between the plates:

The force due to the electric field will act on the electron in the opposite direction to its initial motion, causing it to decelerate. The electron will follow a curved path due to this deceleration.

When the electron exits the region between the plates:

The force due to the electric field will act on the electron in the same direction as its final motion, causing it to accelerate. The electron will follow a curved path due to this acceleration.

Since the situation is symmetrical, the angle at which the electron exits the region between the plates will be the same as the angle at which it enters.

We need to determine the angle θ0 at which the electron enters the region between the plates.

Consider a small portion of the path between the plates and assume that the electric field is constant within this small region.

In this small region, the net force acting on the electron can be expressed as:

F_net = F_electric - F_centrifugal

where F_electric is the force due to the electric field, and F_centrifugal is the centrifugal force.

The force due to the electric field can be calculated as:

F_electric = q * E

The centrifugal force can be calculated as:

F_centrifugal = m * \(v^2 / r\)

where m is the mass of the electron, v is its velocity, and r is the radius of the curved path.

The electron is moving in a curved path, the net force acting on it is responsible for the centripetal force required to maintain this curved path.

Setting the net force equal to the centripetal force, we have:

F_electric - F_centrifugal = m * \(v^2 / r\)

Substituting the expressions for F_electric and F_centrifugal, we get:

q * E - m * v^2 / r = m * \(v^2 / r\)

Simplifying the equation, we have:

q * E = 2 * m * \(v^2 / r\)

Since the electron enters and exits the region between the plates with the same speed v, we can simplify further:

q * E = 2 * m *\(v^2 / r\)

The forces acting on the electron when it enters the region between the plates:

The force due to the electric field is acting in the opposite direction to the initial motion, causing deceleration.

The centrifugal force is acting in the same direction as the initial motion, opposing the deceleration.

For the electron to enter the region between the plates, the force due to the electric field must be greater than the centrifugal force.

We have:

q * E > m * \(v^2 / r\)

Since the electron is moving perpendicular to the electric field, the electric force can be expressed as:

q * E = q * (V/d)

where V is the voltage between the plates, and d is the spacing between the plates

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Answer:

   I = 2.667 kg m²

Explanation:

The moment of inertia of a body can be calculated by the expression

         I = ∫ L² dm

For high symmetry bodies the expressions of the moment of inertia are tabulated, for a rod with its axis of rotation at its midpoint it is

         I = \(\frac{1}{12}\) m L²

let's calculate

         I = \(\frac{1}{12}\)  2  4²

         I = 2.667 kg m²

A RC circuit consists of a resistor and a capacitor connected in series, and it works by charging and discharging the capacitor.

A RC circuit works by storing energy in the electric field of the capacitor and releasing that energy through the resistor as the capacitor discharges. The charging and discharging of the capacitor creates a time-dependent current in the circuit, which is what gives RC circuits their unique behavior.

When the switch is first closed, the voltage across the capacitor starts at zero and begins to increase as the capacitor charges through the resistor. This charging process continues until the voltage across the capacitor reaches the supply voltage, at which point the current in the circuit starts to decrease and the capacitor begins to discharge.

The discharge process continues until the voltage across the capacitor reaches zero, at which point the cycle repeats. The charging and discharging process of the capacitor creates a sinusoidal waveform in the voltage and current of the circuit, with a frequency that is determined by the time constant of the circuit .

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The main answer is: Electric field lines are always perpendicular to the equipotential surfaces. That is, the electric field vectors and the equipotential lines are always orthogonal to each other, which means that they form right angles.The explanation:

Electrostatic fields, which are the regions where electric forces operate, are represented using electric field lines. The electric field strength is measured by the density of the electric field lines. While equipotential surfaces are planes within the electric field that have the same potential energy. The electric field lines originate from a positively charged body and end at a negatively charged body. Meanwhile, the equipotential surfaces are generated in an electrostatic field when all points in the plane are at the same potential.

The electric field lines and equipotential surfaces are connected since they are both part of the same electrostatic field, and their orientations have a relationship with one another. In summary, the electric field lines are always perpendicular to the equipotential surfaces. That is, the electric field vectors and the equipotential lines are always orthogonal to each other, which means that they form right angles.

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True.  The speed of a transitional wave is dependent on both the water depth and the wavelength .

The speed of a wave is determined by the water depth and the wavelength. In shallow water, the speed of a wave is directly proportional to the water depth, while in deep water, the speed is proportional to the square root of the water depth. The wavelength also affects the speed of a wave, as longer wavelengths travel faster than shorter wavelengths. The mathematical formula for calculating the speed of a wave is:

C = √(gT/2π)

where C is the wave speed, g is the acceleration due to gravity (9.81 m/s^2), and T is the wave period (in seconds). This formula shows that the wave speed is dependent on the water depth, as the period of a wave is also affected by the water depth.

In conclusion, the speed of a transitional wave is dependent on both the water depth and the wavelength. The formula for calculating wave speed shows that the speed is directly related to the water depth and the wave period, which is affected by the wavelength. Therefore, in order to accurately predict the speed of a transitional wave, both the water depth and the wavelength must be taken into account.

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Answer:

Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents. The SO2 and NOX react with water, oxygen, and other chemicals to form sulfuric and nitric acids. These then mix with water and other materials before falling to the ground.

Explanation:

Answer:

Friction Opposes Motion of an Object.

Now

To get the Net force that Moves an Object and causes acceleration....You subtract the Frictional force

Net force = Pushing Force - Frictional Force

Recall

Net Force; F=Ma

Ma = P - Fr

Now the question asked for How Much force Must be applied to Maintain a Constant velocity.

In a Constant Velocity Motion... Acceleration do not change... Its Zero

So Putting this into the formula above

M(0) = P - Fr

0=P - Fr

Fr = P.

This means

That The force needed to keep this object Moving at Constant Velocity Must be equal to its Frictional Force

Since Frictional Force; Fr =223N

The Applied Force(Pushing Force) Must be equal to 223N too.

Answer:

Distance is 5m

Explanation:

Work is said to be done when the force applied to an object cause the object to move through a distance

Workdone = Force × distance

W = F×S

Given

W = 25Joules

F = 5N

Required

Distance S

From the formula

S = W/F

S = 25/5

S = 5 meters

Hence the distance is 5metres

Answer:

A wedge can split an object apart

A  lever is the seesaw

inclined plane is a ramp

a pulley can reduce the amount of friction

wheel and axle is the rope one

Explanation:

Following are the matches:

Simple machines are basic mechanical devices that can help make work easier by reducing the amount of force or effort needed to do a task. They are usually the most basic forms of machines, often made up of only one or two parts, and are used to change the direction or magnitude of a force.

There are six types of simple machines:

Simple machines are the building blocks for more complex machines, and they are used in many everyday devices and equipment to make work easier and more efficient.

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8.09 C of charge is present on each electrode.

Each electrode has an 8.09 C charge (microcoulombs).

Using the equation Q = CV, where Q denotes the charge, C the capacitance, and V the potential difference, this may be determined. The formula C = A/d can be used to compute capacitance, where A is the area of the electrodes, d is the distance between them, and is the permittivity of free space.

We may calculate C as follows by plugging in the supplied values: C = (8.85 x 10-12 F/m)(0.06 m x 0.06 m)/(0.001 m) = 3.186 x 10-11 F.

Once this is done, Q = CV = (3.186 x 10-11 F)(9.0 V) = 2.8674 x 10-10 C = 8.09 C.

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Answer:

Radiation

Explanation:

Answer:

B

Explanation:

just took the test

Answer:

b

Explanation:

Kinetic energy depends on mass and speed.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force. Following work, energy is transmitted to the item, which causes it to move at a new, constant speed.

Here given in the question greatest kinetic energy is when body have maximum velocity that is when body fall from maximum height at the point before touching ground body have maximum velocity.

Kinetic energy depends on mass and speed.

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An average force of -39.9 N acts on the ball during the 0.060 s contact time with the racket. The negative sign indicates that the force is in the opposite direction of the initial velocity, meaning the force is applied in the direction the player volleys the ball.

The tennis ball has a mass of 57.0 g (0.057 kg), an initial velocity of 19.0 m/s, a final velocity of -23.0 m/s (since it changes direction), and a contact time of 0.060 s.

First, calculate the change in momentum (Δp) using the formula Δp = mΔv, where m is the mass and Δv is the change in velocity. Δv = final velocity - initial velocity = -23.0 m/s - 19.0 m/s = -42.0 m/s. So, Δp = 0.057 kg * -42.0 m/s = -2.394 kg m/s.

Next, find the average force (F) using the formula F = Δp / Δt, where Δt is the contact time. F = -2.394 kg m/s / 0.060 s = -39.9 N.

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Answer:

(4) The physical and chemical properties of these minerals determine how humans use them.

Explanation:

All the materials and the metals found on earth shows certain characteristics naturally or in their physical state. These physical characteristics can be their look, their structure, their color, strength, melting point, boiling point, density, etc.

And chemical properties of the metals are defined as those characteristics or features of the metals that it exhibits when these metals reacts chemically.

The physical properties as well as the chemical properties distinguishes each metal from each other. These properties determines how people use these metals in their life.