What is the magnitude of the electric field at point A?A) 10 V/mB) 25 V/mC) 30 V/mD) 75 V/mE) 100 V/m

Answer:

Charges B and C are negative

Explanation:

• We are certain of a law of magnetism that states "Field lines move from positive charge to negative charge"

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Answer:

B and C are negative.

Explanation:

This is because according to the law of charges in electric field line it says that the lines forming the electric field move from the positive terminal to the negative terminal,hence making B and C be negative as the lines are moving into them.

Answer:

The new radius will be 1.3 times the original radius, so r_new = 1.3r_old. Plugging this into the equation for moment of inertia, we get:

I_new = m * r_new^2 / 2

= m * (1.3r_old)^2 / 2

= m * 1.69 * r_old^2 / 2

= 1.69 * (m * r_old^2 / 2)

= 1.69 * I_old

Therefore, the moment of inertia increases by 69% when the radius is increased by 30% while the mass is held constant.

The  answer is that a periodic wave transfers energy, only.

A wave is a disturbance that travels through a medium, transferring energy but not mass. As a wave travels through the medium, the particles of the medium oscillate back and forth, but they do not travel with the wave. The energy of the wave is transferred from particle to particle, but the particles themselves do not move with the wave. Therefore, the correct answer to your question is A.

In summary, a periodic wave transfers energy but not mass through the medium. This is an important concept to understand in many fields, including physics, engineering, and biology.

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They have a limited supply in nature, therefore if they are used excessively, they will become exhausted.

Today, we recognise that using fossil fuels has a negative impact on the environment. Fossil fuels produce and utilise local pollutants, and their continued use permanently alters the temperature of our entire world.

Wastes from combustion sources are those that result from carbon pollution (i.e., coal, oil, natural gas). Included in this are all ash and particles taken out of the flue gas.

The fossile fuel is limited in nature. So, it should not waste energy from fossil fuels.

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Answer:

stored

Explanation:

P. E . = m g h  

   represents STORED energy in the form of the height * acceleration of gravity * mass

Answer:

450 kg

Explanation:

In the picture above. Goodluck

Answer:

The correct answer is D :)

Explanation:

Got it right edge 2021

Answer:

Average speed = 25m/s

Acceleration = 12.5m/s^2

Explanation

Let the distance covered by Riley be 50m

Average speed = Distance/Time

Average speed = 50/2

Average speed = 25m/s

Acceleration = Speed/time

Acceleration = 25/2

Acceleration = 12.5m/s^2

Note that the value of the distance was assumed

Of all the multiple choices given, in a tsunami a typical wavelength is 100 to 200 km

The Tsunamis are a series of large waves of extremely long wavelengths and periods produced by a tectonic activity on the seafloor.

It can be caused by:

A typical tsunami causes more than 200 km of wavelength.

In physics, it is the spatial period of a periodic wave. It is the distance between identical points of two consecutive waves.

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Answer:

Explanation:

1 )

F = k q₁q₂ / r² where k = 9 x 10⁹

So force F₁ =  \(\frac{kq_1q_2}{(\frac{r}{2}+\frac{\sqrt{9} r}{2})^2 }\)

= \(\frac{kq_1q_2}{(\frac{r}{2}+\frac{3 r}{2} )^2 }\)

= k q₁q₂ /4 r²

F₁  =  F / 4

2 ) Electric field due to charge density σ

= σ / ε₀

So net electric field between the plates

=   ( σ₁ - σ₂ )  / ε₀

Force on charge  q

=  ( σ₁ - σ₂ ) q   / ε₀

work done = force x displacement

=  ( σ₁ - σ₂ ) x q x d   / ε₀

Answer:

32.5

Explanation:

Choose the normal force acting between the object and the ground. Let's assume a normal force of 250 N .

Determine the friction coefficient. ...

Multiply these values by each other: (250 N) * 0.13 = 32.5 N .

You just found the force of friction!

Usually, not all atoms exhibit magnetism despite electrons behaving like magnets. Magnetism in atoms depends on the arrangement and alignment of electrons.

Electrons have spin orientations, either "up" or "down."

In atoms, when electrons pair up with opposite spins, their magnetic effects cancel out, resulting in no net magnetism.

Only in certain materials with unpaired spins and aligned magnetic moments, like iron or cobalt, do atoms exhibit magnetism.

However, most atoms have electron configurations that lack unpaired spins or significant alignment of magnetic moments, leading to no noticeable magnetism.

The presence or absence of magnetism in atoms is determined by the electron arrangement and interactions.

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Answer:

led would be the best for decorations

Explanation:

A helicopter’s velocity increases from 35 m/s to 70 m/s in 10 seconds. The acceleration of this helicopter is 3.5 m/s².

The term acceleration is defined as the change in velocity as per time,  in terms of both speed and direction. Acceleration is denoted by the symbol "A".

Unbalance forces ac cause acceleration in an object. It was changing its speed, its direction, or both its speed and direction.

A = V / T

Where,

A = acceleration

V = velocity

T = time

We have given:

Velocity = 70 - 35 = 35 m/s

Time = 10 seconds

Acceleration = ?

By putting this value in given equation we can find the acceleration of this helicopter

A = 35 / 10

= 3.5 m / s²

Thus, A helicopter’s velocity increases from 35 m/s to 70 m/s in 10 seconds. The acceleration of this helicopter is 3.5 m/s².

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The total charge flown across any cross section of the wire in time interval 0-T is determined from the area under the curve as ¹/₂i₀T.

option (2) is the correct answer.

The total charge flown across any cross section of the wire in time interval 0-T is calculated as follows;

The total charge flowing = area under the curve

area under the curve = ¹/₂ x base of the triangle x height of the triangle

area under the curve = ¹/₂ x T  x i₀

area under the curve = ¹/₂i₀T

Thus, the total charge flown across any cross section of the wire in time interval 0-T is determined from the area under the curve as ¹/₂i₀T.

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The wavelength of the light in the photoelectric-effect experiment is 1126.72 nanometers.

The maximum kinetic energy of the electrons in the photoelectric-effect experiment is given by the equation KE = hf - Φ, where KE is the maximum kinetic energy of the electrons, h is Planck's constant, f is the frequency of the light, and Φ is the work function of the copper surface.

Since the maximum kinetic energy is given as 1.10 eV, we can convert it to joules using the conversion factor 1 eV = 1.602 x 10^-19 J. Thus, 1.10 eV = 1.77 x 10^-19 J.

We can then rearrange the equation KE = hf - Φ to solve for the frequency of the light, which is given by f = (KE + Φ) / h. The work function of copper is typically around 4.7 eV, so we can convert it to joules as well to get Φ = 7.55 x 10^-19 J.

Substituting the values we have, we get f = (1.77 x 10^-19 J + 7.55 x 10^-19 J) / (6.626 x 10^-34 J s) = 3.17 x 10^15 Hz.

Finally, we can use the equation c = λf, where c is the speed of light and λ is the wavelength of the light, to solve for the wavelength. The speed of light is approximately 3.00 x 10^8 m/s, so we can convert it to nanometers by multiplying by 10^-9.

Substituting the values we have, we get λ = c / f = (3.00 x 10^8 m/s) / (3.17 x 10^15 Hz) = 94.4 nm. Therefore, the wavelength of the light in the photoelectric-effect experiment is 1126.72 nanometers.

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Answer:

electrons have a negative charge, while protons have a positive charge

Explanation:

In science "opposites attract"

Explanation:

It should me QUARTZ AND... CLAY

The force in member BD is 330 N, and the reaction at C consists of two components: 130 N along the x-axis and 200 N along the y-axis.

What is force?
A force is indeed an influence that really can alter an object's motion according to physics. A motion of an object to mass to accelerate when it changes its velocity, such as when it moves away from rest. An intuitive way to describe force is as a push or a pull. A force is a vector quantity because it has both direction and magnitude. It is calculated using the newton SI unit (N). Force is denoted by the letter F. (formerly P). The net force acting on an object is proportional to the frequency that its momentum changes over time, according to Newton's second law in its original formulation.

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The power factor of the circuit is approximately 0.50.

To determine the power factor of the circuit, we need to calculate the phase angle between the current and voltage in the circuit. The power factor is given by the cosine of this phase angle.

Given:

Frequency (f) = 50 Hz

Resistor (R) = 40 ohms

Inductor (L) = 0.30 H

Capacitor (C) = 60 μF (microfarads)

RMS current (I) = 1.6 A

To find the phase angle, we need to calculate the impedance (Z) of the circuit. Impedance is the total opposition to the flow of current in an AC circuit and is calculated using the formula:

Z = √(R² + (Xl - Xc)²)

where R is the resistance, Xl is the inductive reactance, and Xc is the capacitive reactance.

The inductive reactance (Xl) is given by:

Xl = 2πfL

The capacitive reactance (Xc) is given by:

Xc = 1 / (2πfC)

Now, let's calculate the values:

Xl = 2π × 50 Hz × 0.30 H

  ≈ 94.25 ohms

Xc = 1 / (2π × 50 Hz × 60 μF)

  ≈ 53.05 ohms

Next, we calculate the impedance (Z):

Z = √(40² + (94.25 - 53.05)²)

 ≈ 79.90 ohms

Finally, we can calculate the power factor (PF) using the formula:

PF = cos(θ) = R / Z

PF = 40 ohms / 79.90 ohms

    ≈ 0.50

Correct Question: A series circuit consists of a 50-Hz ac source, a 40-ohm resistor, a 0.30-H inductor, and a 60-uF capacitor. The RMS current in the circuit is measured to be 1.6 A. What is the power factor of the circuit?

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Racial formations are defined as the social historical concepts by which radial identities are created lived out, transformed, and destroyed.

Race is the way of separating groups of people based on social and biological aspects. It is the process through which a specific group of people is defined as race.

Racial formations explain the definition of specific race identities. It examines the race as a dynamic social construct with structural barriers ideology etc.

This theory gives attempt to determine the difference between people based on how they live rather than how they look. Hence, in the racial formations essay reading, race is defined as a socio-historical concept.

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(I) The second-order system described by the given transfer function has the following characteristics:

Gain (K): 625

Natural frequency (ωn): 25

Damping ratio (ζ): 1

Damped natural frequency (ωd): 0

(ii) The approximate values for the time response characteristics are as follows:

Rise Time (Tr): 0.014 seconds

Peak Time (Tp): 0.072 seconds

Settling Time (Ts): 0.16 seconds

Number of Oscillations before Settling: 0

I.

To evaluate the gain, natural frequency, damping ratio, and damped natural frequency of the second-order system with the given transfer function:

Gain (K):

The gain is the value of the transfer function at s = 0. To find the gain, substitute s = 0 into the transfer function:

G(0) = 30(0) + 625 = 625

So, the gain of the system is 625.

Natural frequency (ωn):

The natural frequency can be found by identifying the coefficient of the s term in the denominator of the transfer function. In this case, the transfer function is in the form:

G(s) = ωn² / (s² + 2ζωn s + ωn²)

Comparing this to the given transfer function, we can identify that ωn² = 625. Taking the square root of this value gives us:

ωn = √625 = 25

So, the natural frequency of the system is 25.

Damping ratio (ζ):

The damping ratio can be found by identifying the coefficient of the s term in the denominator and dividing it by 2 times the square root of the product of the coefficients of the s² term and the constant term. In this case, we have:

ζ = (2ζωn) / (2√(ωn²))

Since the denominator simplifies to 2ζ, we can see that ζ = 1.

So, the damping ratio of the system is 1.

Damped natural frequency (ωd):

The damped natural frequency can be found by multiplying the natural frequency by the square root of 1 minus the square of the damping ratio:

ωd = ωn√(1 - ζ²) = 25√(1 - 1) = 25√0 = 0

So, the damped natural frequency of the system is 0.

ii.

To evaluate the system's time response to a step input of amplitude 4 units, we need to analyze the step response of the system. Based on the given transfer function, the system is a second-order system with no oscillation (ωd = 0), indicating a critically damped response.

For a critically damped system, the time response characteristics are as follows:

Rise Time (Tr): Approximately 0.35/ωn = 0.35/25 = 0.014 seconds

Peak Time (Tp): Approximately 1.8/ωn = 1.8/25 = 0.072 seconds

Settling Time (Ts): Approximately 4/(ζωn) = 4/(1*25) = 0.16 seconds

Number of Oscillations before Settling: 0 (since the system is critically damped)

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SWOT Analysis Strengths- Paley’s Products has a low overhead cost with the company operating at a high level of efficiency, resulting in competitive pricing.- They have a team of experienced employees who have worked in the industry for several years.- They have a variety of products in the portfolio that can satisfy customers from different sectors.- They are reputable and have a loyal customer base.Weaknesses- They have been slow to adopt new technology, and this may be a disadvantage to the company.- Limited marketing and sales promotion are affecting their sales revenue.-

They depend on a few key customers for the bulk of their sales revenue, leaving them vulnerable to market changes.Opportunities- Expansion of the product line to include unique products.- The establishment of strategic partnerships with other businesses in the industry.- Exploration of new markets, such as international markets.- Improvement of marketing techniques to increase brand awareness.Threats- Changes in consumer preferences towards environmentally friendly products.- Increase in competition from other businesses in the industry.- Fluctuating market prices for raw materials that may lead to price increases.

Strategic Actions to be taken by Paley Products1. Development of an E-commerce platform to allow online transactions with customers. The E-commerce platform will enable Paley to reach a wider customer base, expand its reach, and increase sales revenue.2. Investment in the research and development of new environmentally friendly products. Paley will remain competitive and cater to the needs of consumers who prefer green products.3. Establishment of strategic partnerships with other businesses in the industry to leverage the strength of other companies in the industry and to develop new products or increase market share.4. Improvement of marketing techniques to increase brand awareness and improve visibility. A marketing strategy that incorporates social media and other digital channels can help promote the brand to potential customers.5. Expansion into international markets. This will enable Paley to diversify its customer base and generate more revenue. Paley can start by targeting nearby countries, then expand globally as they gain more experience and financial stability.

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Answer:

Mosquito Larve commonly called wigglers live in water from 4 to 14 days depending on water temperature

Answer:

5 m/s^2

Explanation:

Acceleration is change in velocity  /  change in time

   Accel = 25 m/s  /  5 s = 5 m/s^2

Answer:

The weight of the astronaut in Earth's orbit 400 km above the Earth's surface is 664.115 N

Explanation:

The given parameters are;

The weight of the astronaut on the ground = 750 N

The height of the orbit above the Earths surface = 400 km

The radius of the Earth = 6.38 × 10⁶ m

The mass of the Earth = 5.97 × 10²⁴ kg

The universal gravitational constant G = 6.674 × 10⁻¹¹ Nm²/kg²

From Newton's law of universal gravitation, we have;

\(Weight \ on \ ground \ of \ astronaut \ F_W =G\times \dfrac{M_{Earth} \times m_{astronouat}}{R_{Earth}^{2}} = 750 \ N\)

\(F_W =6.674 \times 10^{-11}\times \dfrac{5.97 \times 10^{24}\times m_{astronouat}}{(6.38 \times 10^6)^{2}} = 750 \ N\)

\(m_{astronaut}\) = ((6.38 × 10⁶)² × 750)/((6.674 × 10⁻¹¹) × (5.97 × 10²⁴)) ≈ 76.62 kg

The mass of the astronaut ≈ 76.62 kg

For the weight of the astronaut  in Earth orbit 400 km (400 × 10³ m) above the Earth's surface, we have;

\(F_{W \ in \ orbit} =6.674 \times 10^{-11}\times \dfrac{5.97 \times 10^{24}\times 76.62}{(6.38 \times 10^6 + 400 \times 10^3)^{2} } = 664.115 \ N\)

The weight of the astronaut in Earth's orbit 400 km above the Earth's surface = 664.115 N.

The length of the vector is proportional to the size of the force.

The wheelchair is not accelerating, so the forces on it are balanced.

In a free-body diagram of the wheelchair, force due to gravity points down,  normal force points up, force pushing the wheelchair points forward, friction resisting the motion points backward.

For the force diagram:

Forces are a push or pull agents that causes a change in the state of a body when they are applied to the body.

Unbalanced forces cause acceleration of a body.

In a free-body diagram, the mass (force) on an object is represented by a vector.

The length of the vector is proportional to the size of the force. Suppose you push a wheelchair forward at constant velocity. The wheelchair is not accelerating, so the forces on it are balanced. In a free-body diagram of the wheelchair, the vector for the force due to gravity points down, the vector for the normal force points up, the vector for your force pushing the wheelchair points forward, and the vector for the force of friction resisting the motion points backward.

Considering the picture visual representation of the forces between many interacting objects or the force diagram:

In picture 1: F gravity points down; F normal points up

In picture 2: F gravity points down; F tension points up

In picture 3: F gravity points down; F spring points up.

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The damages of $100,000 awarded to the plaintiff are likely to be excluded from taxable income since they were awarded as compensation for physical injury.

In general, damages received in a lawsuit are taxable as income unless they are awarded for physical injury or sickness. In this case, since the plaintiff lost the use of her leg due to the assault, the damages awarded to her are likely to be considered compensation for physical injury.

However, it is important to note that there are certain exceptions and limitations to the exclusion of damages for physical injury. For example, punitive damages, which are awarded to punish the defendant for their behavior rather than to compensate the plaintiff for their injury, are generally not excludable from taxable income. Additionally, if the damages received include amounts for lost wages or other taxable income, those amounts will be subject to income tax.

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