Main-group elements from Period 3 of the periodic table are highlighted. Which element is a highly reactive metal?​

Answer:

1) wave length

2) parallel reflection

The momentum of the water balloon is 0.39116 Kg•m/s

Momentum is simply defined as the product of mass and velocity i.e

With the above formula, we can obtain the momentum of the water balloon as follow:

Mass = 0.035 kg

Velocity = 11.176 m/s

Momentum = mass × velocity

Momentum = 0.035 × 11.176

Therefore, the momentum of the water balloon is 0.39116 Kg•m/s

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a) Strontium has 38 electrons.

Its electronic configuration is,

As it can be seen, the valency of strontium is 2. Thus it needs to lose 2 electrons to be stable.

Thus the answer is '2 lost'.

b) The atomic number of antimony is 51. The electronic configuration of antimony (Sb) is

Thus The

Answer:

15m

Explanation:

Our Galaxy, also known as the Milky Way, is composed of three main parts: the central bulge, the disk, and the halo. The central bulge is a dense region at the center of the galaxy where many old stars are located. The disk is a flattened region that contains most of the galaxy's gas, dust, and younger stars. The halo is a spherical region that surrounds the disk and contains mainly old stars and clusters.

What is a galaxy?

A galaxy is a group of millions of stars and their systems that are grouped due to gravitational forces.

According to the Big Bang theory, galaxies are expanding and separate among them.

In conclusion, the reason galaxies that are distant from our galaxy move away from our galaxy more rapidly is more space expands between us and distant galaxies.

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The problem requires calculating the maximum velocity and maximum acceleration of a mass in motion, as well as identifying where these maximum values occur during the motion.

To determine the maximum velocity and maximum acceleration of the mass, we need more information about the motion, such as the specific equation or function that describes its position, velocity, or acceleration over time. Without this information, it is not possible to provide a specific answer.

In general, the maximum velocity occurs at the point where the acceleration is zero or changes direction, such as at the extremes of the motion (e.g., when the mass changes direction). The maximum acceleration, on the other hand, depends on the specific forces acting on the mass and the characteristics of the motion.

To find the maximum velocity and maximum acceleration, it is necessary to analyze the motion equation or plot a graph of the position, velocity, or acceleration over time. These calculations can be done using principles of kinematics and calculus, taking into account the specific conditions and constraints of the system.

Without additional information about the motion, it is not possible to determine the exact values or locations of the maximum velocity and maximum acceleration of the mass.

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Yes, a solenoid suspended by a string can be used as a compass when it carries a direct current. This is because the solenoid creates a magnetic field when current flows through it.                                                                                                                    

The magnetic field aligns with the Earth's magnetic field, causing the solenoid to point in the direction of magnetic north. However, if the current were alternating in direction, the solenoid would constantly change its orientation and would not be reliable as a compass.
This magnetic field interacts with Earth's magnetic field, causing the solenoid to align itself with the magnetic north and south poles, acting as a compass.
Consequently, a solenoid with an alternating current would not function effectively as a compass.

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Answer:

Momentum

Explanation:

-Conservation means that any quantity is kept constant.❌

-Force is product of mass and acceleration.❌

-Impulse is product of force and the period of action of the force.❌

-Momentum is the product of mass of a body and it's velocity.✔️

Answer:

Cycloheptatriene

Explanation:

Answer:

Cycloheptatriene or Toluene

Explanation:

I hope this helps!

The answer is:

To calculate the electric field at a point due to a point charge, we can use the formula:

\(E = k * q / r^2\)

where E is the electric field, k is the Coulomb constant, q is the charge of the point charge, and r is the distance from the point charge to the point where we want to find the electric field.

In this case, we have a + charge of q =\(1.50 * 10^{-8} C\) and we want to find the electric field at a point 0.200 m to the right of the charge. Therefore, the distance r = 0.200 m.

Plugging in the values, we get:

E = \((9 * 10^9 N*m^2/C^2) * (1.50 * 10^{-8} C) / (0.200 m)^2\)

E = \(1.69 * 10^5 N/C\)

The electric field is directed away from the + charge, so we include a + sign to indicate the direction of the field.

\(1.69 *10^5 N/C\) to the right (+)

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a.the magnitude of the displacement is

On a circular track with a radius of RR, the automobile completes three-quarters of a lap beginning at point X 1X 1. The point X 2X 2 designates its final position. X 0X 0 indicates the location of the circular track's center.

How would you define magnitude?

Magnitude is simply "distance or quantity" in the context of physics. In terms of motion, it shows the absolute or relative size, direction, or movement of an object. It is used to describe something's size or scope. Magnitude in physics typically refers to a size or quantity.What does a vector's magnitude mean?

The length of a vector determines its magnitude. The letter "a" stands for the vector's magnitude. For more information on a vector's magnitude, see the introduction to vectors. This article deduces formulas for the magnitude of vectors in two and three dimensions in terms of their coordinates.

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Answer:

It is most likely option A B and C

Answer:

I think option A ,B,D are correct

The acceleration of the mass is 16.235 m/s².

Mass, m = 0.15 slug

External vertical force, F = 8 lbf

Gravity acceleration, g = 29 ft/s²

The formula used to calculate the acceleration is:

F = ma

Here, F is the force, m is the mass and a is the acceleration. Rearranging the equation and substituting the given values:

Acceleration, a = F/ma = F/m= 8 lbf / 0.15 slug

Acceleration, a = 53.333 ft/s²

Since the value of acceleration is required in m/s²,

let's convert it to m/s².1 ft/s² = 0.3048 m/s²

So, 53.333 ft/s² = 53.333 × 0.3048 m/s²= 16.235 m/s²

Therefore, the acceleration of the mass is 16.235 m/s².

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Answer:

conduction

Explanation:

conduction is the movement of heat from one point to another on a metal.

Hope it helps.

It will take the ball 1 s to drop to the ground

The distance from the launch point where the ball will strike the ground would be 16.0 m.

We can use the kinematic equations of motion to solve this problem. The vertical motion of the ball can be described using the equation:

h = vit + 1/2g*t^2

where h is the initial height, vi is the initial vertical velocity (which is zero), g is the acceleration due to gravity (9.8 m/s^2), and t is the time taken to fall to the ground. Solving for t, we get:

t = sqrt(2h/g) = sqrt(2*4.91 m/9.8 m/s^2) = 1 s

The horizontal motion of the ball is uniform, since there is no horizontal acceleration. We can use the equation:

d = v*t

where d is the distance traveled, v is the initial horizontal velocity (which is 16.0 m/s), and t is the time taken to hit the ground (which is 1 s). Solving for d, we get:

d = v*t = 16.0 m/s * 1 s = 16.0 m

So the ball will strike the ground 16.0 meters away from the launch point, measured horizontally.

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The answer to this question is stranded conductors.

Conductors are the substances that allows the current to pass through them.

There are different types of conductors.

The conduction of the electricity is due to the flow of electrons. These electrons freely flows through the atoms of that material.

This also affects the flow of current. It depends on the surface area.

There are different currents used for different purpose. As Direct Current is used as the power source for electroplating.

We all know that the conductance is directly proportional to the surface area and inversely proportional to the length.

Skin effect in the conductors can be understood as the tendency of the electricity to flow mostly to the outer surface.

This can be reduced or increased by using a material of the larger surface area.

Skin effect can be reduced by using stranded conductors, which provide greater surface area for current than solid conductors.

The stranded conductors can reduce this effect as these conductors are made of many small wires which are grouped together to make one single wire for the current to pass through. This way the skin effect can be reduced.

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Because the location of the outermost electron is unclear and we are unsure of its exact location, calculating the atomic radii is fairly challenging.

A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.

An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.

The overlap of ions in a lattice structure makes it challenging to estimate the ionic radius.

Ionic radius typically decreases from group 1 to group 3 since the produced ions have a larger nuclear charge, more protons, and smaller ionic radius due to the electrons being drawn closer to the nucleus.

Calculating the atomic radii is fairly difficult because the location of the outermost electron is obscure and we are unaware of its precise location.

Thus, it is difficult to describe atomic radius and the ionic radius.

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The comparison of the larger intensity earthquake is 2 times that of a smaller intensity earthquake from the given data.

When two ground slabs abruptly move past one another, an earthquake occurs. The region where they slip is the fault or fault plane. The movement creates seismic waves, which travel through the Earth and cause the ground to tremble. These seismic waves are made up of elastic strain energy that has been built up.

The given larger intensity earthquake has 8.4 magnitude.

The given smaller intensity earthquake has 3.7 magnitude.

So, the ratio of intensity is,

⇒ (larger intensity)/(smaller intensity)

⇒ 8.4/3.7 = 2.27 ≈ 2.3 ≈ 2

Hence, we can conclude that larger earthquake's intensity is 2 times as great as the smaller earthquake's intensity.

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The radius of the cylinder is approximately 2.19 m, and the cylinder is experiencing a deceleration of approximately 1.86 m/s². Since the cylinder is decelerating and the force applied is less than the friction force, it is not slipping.

From the given information:

Mass of the cylinder, m = 5 kg

Moment of inertia of the cylinder, I = 12 kg·m²

Diameter of the cylinder, D = 0.5 m

Force applied, F = 25 N

Coefficient of friction, μ = 0.7

Radius of the cylinder, r = ?

To determine the radius (r) of the cylinder, we can use the relationship between moment of inertia (I) and mass (m) for a solid cylinder:

I = (1/2) * m * r²

Given I = 12 kg·m² and m = 5 kg, we can solve for r:

12 = (1/2) * 5 * r²

r² = 12 / (1/2) * 5

r² = 12 / 2.5

r² = 4.8

r ≈ √4.8

r ≈ 2.19 m

So, the radius of the cylinder is approximately 2.19 m.

Now, let's determine the acceleration of the cylinder. The force applied is given as F = 25 N. The friction force can be calculated using the equation:

Friction force = μ * Normal force

Since the cylinder is being pulled by the string, the normal force is equal to the weight of the cylinder, which is given by:

Weight = mass * acceleration due to gravity

Weight = m * g

Assuming a standard acceleration due to gravity of 9.8 m/s²:

Weight = 5 kg * 9.8 m/s² = 49 N

Friction force = μ * Normal force = μ * Weight = 0.7 * 49 N = 34.3 N

Now, we can calculate the net force acting on the cylinder:

Net force = Force applied - Friction force

Net force = 25 N - 34.3 N

Net force = -9.3 N

Since the net force is negative, indicating that the force applied is less than the friction force, the cylinder will experience a deceleration rather than acceleration. The magnitude of the deceleration can be calculated using Newton's second law:

Net force = mass * acceleration

-9.3 N = 5 kg * acceleration

acceleration = -9.3 N / 5 kg

acceleration = -1.86 m/s²

The negative sign indicates that the deceleration is in the opposite direction to the force applied, which means the cylinder is moving in the direction opposite to the applied force.

Hence, the radius of the cylinder is approximately 2.19 m, and the cylinder is experiencing a deceleration of approximately 1.86 m/s². Since the cylinder is decelerating and the force applied is less than the friction force, it is not slipping.

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Answer:

A. Their shape

Explanation:

The name clearly shows that the shape of these canals are semi-circular. The semi-circular canals consist of three tubes filled with fluid and located in the inner ear. They help to maintain balance and transmit impulses through the movement of the fluids. The impulses sent through these fluids are sent to the brain for interpretation.

The function of the canals are not indicated by the name, rather the shape is hinted through the name.

Answer:

mars is a fourth planet of the sun and the second planet in the solar system

moon is a natural satellite of the earth it isthe fifth largest moon in the solar system

Hi there!

Acceleration:

a = Δv / Δt, so:

a = 20/9 ≈ 2.22 m/s²

Displacement:

We can use the equation Δd = v₀t + 1/2at² to solve. (Initial velocity is 0).

Δd = 1/2at²

Plug in the acceleration and time:

Δd = 1/2(2.22)(9)² ≈ 89.91 m

A solar cell is a device that converts photon energy into electrical energy. The efficiency of the solar cells has been improved through much research. In this review, two types of solar cells are discussed.

1. A P-N junction solar cell uses a photovoltaic effect to convert photon energy into electrical energy. The basic principle behind the functioning of a solar cell is based on the photovoltaic effect. It is achieved by constructing a junction between two different semiconductors. Silicon is the most commonly used semiconductor in the solar cell industry. When the p-type silicon, which has a deficiency of electrons and the n-type silicon, which has an excess of electrons, are joined, a p-n junction is formed. The junction of p-n results in the accumulation of charge. This charge causes a potential difference between the two layers, resulting in an electric field. When a photon interacts with the P-N junction, an electron-hole pair is generated.

2. There are two primary types of solar cells: crystalline silicon solar cells and thin-film solar cells. The construction of a solar cell determines its efficiency, so these two different types are described in detail here.

3. Crystalline silicon solar cells are made up of silicon wafers that have been sliced from a single crystal or cast from molten silicon. Thin-film solar cells are made by depositing extremely thin layers of photovoltaic materials onto a substrate, such as glass or plastic. When photons interact with the photovoltaic material in the thin film solar cell, an electric field is generated, and the electron-hole pairs are separated.

4. Solar cell efficiency is a measure of how effectively a cell converts sunlight into electricity. The output power of a solar cell depends on its efficiency. The performance of the cell can be improved by increasing the efficiency. There are several parameters that can influence the efficiency of solar cells, such as open circuit voltage, fill factor, short circuit current, and series resistance.

5. Researchers are always looking for ways to increase the efficiency of solar cells. To improve the performance of the cells, numerous techniques have been developed. These include cell structure optimization, the use of anti-reflective coatings, and the incorporation of doping elements into the cell.

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a) y(t) = te⁻³ᵗ is a possible position function.

b) General equation: y(t) = C₁e^(-2t) + C₂e^(-3t) + t(e^(-3t))(At + B).

c) Exact motion equation: y(t) = (23/5)e^(-2t) - (8/5)e^(-3t) + t(e^(-3t))(At + B), with initial conditions y(0) = 3 and v(0) = -7.

a) To show that y(t) = te⁻³ᵗ is a possible position function, we substitute it into the differential equation:

y(t) = te⁻³ᵗ

y'(t) = e⁻³ᵗ - 3te⁻³ᵗ

y''(t) = -6e⁻³ᵗ + 9te⁻³ᵗ

Substituting these expressions into the differential equation, we have:

-6e⁻³ᵗ + 9te⁻³ᵗ + 7(e⁻³ᵗ - 3te⁻³ᵗ) + 6(te⁻³ᵗ) = -6te⁻³ᵗ - e³ᵗ

Simplifying this equation, we find that both sides are equal, thus confirming that y(t) = te⁻³ᵗ is a possible position function.

b) The general equation for all possible position functions can be written as:

y(t) = C₁e^(-2t) + C₂e^(-3t) + t(e^(-3t))(At + B)

c) Given the initial conditions y(0) = 3 and y'(0) = v(0) = -7, we substitute these values into the general equation and solve for the constants:

3 = C₁ + C₂

-7 = -2C₁ - 3C₂

Solving these equations, we find C₁ = 23/5 and C₂ = -8/5.

The exact motion equation for the weight is:

y(t) = (23/5)e⁻²ᵗ - (8/5)e⁻³ᵗ + t(e⁻³ᵗ)(At + B)

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Suppose a weight of 1 kg is attached to an oscillating spring with friction constant b = 7 and stiffness constant k = 6. Suppose the external forces on the weight are: Fₑₓₜ(t) = - 6te⁻³ᵗ - e³ᵗ

y" + 7y' + 6y = - 6te⁻³ᵗ - e³ᵗ

a) Show y(t) = te⁻³ᵗ is a possible position function for this weight.

b) Find a general equation for all possible position functions.

c) Find the exact motion equation for this weight if its initial position is y(0) = 3, and its initial velocity is v(0) = y'(0) = -7.

The electrical power decreases by decreasing the current and voltage. Thus, the ideal solution is option B.

Electric power is defined as the rate of work done or energy per unit of time in electrical circuits. The power equals the product of potential difference across the circuit and the current flow through the circuit. The unit of electric power is Watt. Electrical power is defined as the electrical energy transferred in the circuit.

From the given,

Power (P) = Potential difference × current. Thus, the power is directly proportional to the potential difference or voltage and the current in the circuit. When voltage and current increase, power also increases and vice-versa.

Thus, the power is decreased by decreasing the current and voltage across the circuit. Hence, the correct solution is option B.

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Explanation:

Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together and, therefore, can transmit the vibrations faster. Sound travels most slowly through gases because the molecules of a gas are farthest apart.

Answer:

40 m/s

Explanation:

F = ma (force = mass * acceleration)

a = F/m

a = 200 N / 50 kg

a = 40 m/s

Answer:

Gravitational

Explanation:

When studying atoms, scientists can ignore the  gravitational force between charged particles that make up the atoms because it is many millions of times smaller than other forces in the atom.

Answer:

Gravitational

Explanation:

When earth catches up to a slower-moving outer planet and passes it in its orbit, in the same way that a faster runner overtakes a slower runner in an outside lane, the outer planet exhibits retrograde motion.

What do you mean by retrograde motion?

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