If you want to decrease the current created by a generator what can you do?

The correct choice is (D) nλ; where n is the quantum number and λ is the de Broglie wavelength of the electron in the n orbital.

In the Bohr model of the hydrogen atom, electrons orbit the nucleus at certain energy levels or orbitals. The b wavelength (λ) of an electron is related to its energy and can be expressed as:

λ = h/p,

where h is the Planck constant and p is the energy of the electron.

The energy of the electron in the nth orbit can be calculated by the Bohr formula:

p = n * h / (2πr),

where n is the quantum number representing the energy level of the orbital, h is the Planck constant, r is the radius of the nth trace .

To find the circumference of the orbit, we must multiply the de Broglie wavelength by the number of wavelengths that match the circumference of the orbit. Since the circle is equal to 2πr, the appropriate wavelength number is given as:

circle / λ = 2πr / λ.

Converting the expression λ to power, we get:

/ (h / p) = 2πr / (h / p).

simplified expression:

perimeter = 2πr * p / h. Replace the p expression in the

Bohr model formula:

Circumference = 2πr * (n * h / (2πr)) / h.

Further simplification:

perimeter = n * r.

Therefore, the circumference of the nth orbit is proportional to the radius of the orbit given by the equation:

circumference = n * r.

Therefore, the correct choice is D) nλ; where n is the quantum number and λ is the de Broglie wavelength of the electron in the n orbital.(option-D)

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Answer:

Inclined plane = 2. Something that can hold things together or lift an object. Wedge = 3.

Explanation:

Screw is simple machine which is used to hold to objects together

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Answer:

The electrical energy consumed in boiling the water is 0.0788 kWh

Explanation:

Given;

mass of the water, m = 600 g = 0.6 kg

power rating of the kettle, P = 1500 W = 1.5 kW

specific heat capacity of water, c = 4,200 J/kg⁰C

density of water, = 1000 kg/m³

time taken to boil the water, t = 3 mins + 9 s = (3 x 60s) + 9 s = 180 s + 9 s = 189 s = \(189 \ s \times \frac{1 hr}{3.600 \ s} = 0.0525 \ hr\)

The electrical energy consumed in boiling the water is calculated as;

E = P x t

E = 1.5 kW  x 0.0525 hr

E = 0.0788 kWh

Therefore, the electrical energy consumed in boiling the water is 0.0788 kWh

ANSWER

EXPLANATION

(a) To find the car's average acceleration, we have to apply the formula for average acceleration:

where Δv = change in velocity

t = time

Therefore, the car's average acceleration is:

(b) The car can go from 34 m/s to 0 m/s in 3.7s.

Therefore, applying the formula for average acceleration, the average acceleration of the car is:

That is the answer.

1) Its induction motor's maximum torque is 114.98 Nm. 2) This induction motor has a starting torque of 49.98 Nm. 3). The motor generates 4.85  power at this slip.

The important induction motor specs and performance characteristics can be determined from the test results:

Calculating the Parameters

The motor resistance is determined by the DC Test to be:

R₂=Vdc/Idc

R₂=28.97Ω

From the No Load Test, we can determine the following shunt branch characteristics:

Xm=Vt(3*I₀)

Xm=230*(3*60)

Xm=432.48Ω

Using the Locked Rotor Test, we can determine the series branch parameters as follows:

The maximum torque of an induction motor occurs at a slip of:

Smax=√R₂/(R₁+R₂)²+X₂/(X₁+Xm)²

Smax=√28.97/(10.12+28.97)²+11.56/(432.48+11.56)

Smax=0.78

Tmax=3*Vt²(R₂/(R₁²+(Xm+X₁))²

Tmax=3*230*28.97/(10.1²(432.48+11.56))²

Tmax=114.98Nm

The starting torque of an induction motor can be computed using:

T start=3*Vt²(R₂/(R₁²+(Xm+X₁))²

T start=3*230*28.97/(10.1²(432.48+11.56))²

T start=49.98Nm

P = 2πTmaxN

= 2π × 114.48 Nm × 60

= 1152π

= 3619.11

converting to HP

= 3619.11 /746

= 4.85 HP

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Answer:

122.4

Explanation:

By examining the influence of surface area and material composition on thermal energy transfer in a controlled experiment, we can gain valuable insights into the fundamental factors that affect heat exchange. This knowledge can have practical applications in fields such as engineering, materials science, and energy efficiency.

A good question about the variables that affect thermal energy transfer in a controlled experiment could be: How does the surface area and material composition of an object influence the rate of thermal energy transfer?

By focusing on the surface area and material composition, we can investigate how these two variables affect the transfer of thermal energy. The surface area of an object determines the amount of area available for heat exchange, potentially affecting the rate of energy transfer. The material composition, on the other hand, can impact factors such as thermal conductivity, specific heat capacity, and emissivity, all of which play a role in how effectively heat is transferred.

To conduct the experiment, you can select objects of different materials and surface areas, such as metal plates or plastic blocks with varying dimensions. By exposing them to a controlled heat source and measuring the temperature change over time, you can analyze how the chosen variables affect thermal energy transfer.

This investigation would provide insights into the fundamental factors that influence heat exchange and can be used to inform practical applications in various fields such as engineering, materials science, and energy efficiency.

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The formula used to directly calculate the kinetic energy of a mass bouncing up and down on a spring is KE= \(1/2mv^2\).

When a mass is bouncing up and down on a spring, it possesses both potential energy and kinetic energy. The potential energy of the mass is stored in the spring, which is proportional to the displacement of the mass from its equilibrium position. As the mass oscillates back and forth, it also possesses kinetic energy, which is the energy of motion.

The formula used to directly calculate the kinetic energy of a mass bouncing up and down on a spring is KE= \(1/2mv^2\), where m is the mass of the object and v is its velocity. The velocity of the mass is constantly changing as it oscillates back and forth, so the kinetic energy is also constantly changing.

In contrast, the formula KE= \(1/2kx^2\)is used to calculate the potential energy of the mass stored in the spring, where k is the spring constant and x is the displacement of the mass from its equilibrium position. This formula is not directly used to calculate the kinetic energy of the mass bouncing up and down on the spring.

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Explanation:

he fell down with telling any one,

Two identical speakers in the same orientation produce waves of the same wavelength that are in phase. At a point midway between the speakers, you would expect to hear louder due constructive interference took place.

While destructive interference can result in the complete cancellation of the contributing waves, constructive interference causes an increase in the amplitude of the sum wave. The "speaker and baffle" experiment, which uses a small loudspeaker and a large, square wooden sheet with a circular hole the same size as the speaker, is an intriguing demonstration of both sound interference and diffraction. When music is played through the loudspeaker, out-of-phase sound waves from the speaker's front and back diffract into the surrounding area. Particularly at very low frequencies, where the wavelength is longest and the diffraction is therefore greatest, the two waves interfere destructively and cancel one another.

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According to the illustration, the graphic illustrates the arrow and the intended target.

To target something or someone means to aim at them specifically. To aim a gun at a shooting range is an example of a target. To focus all of your efforts on one objective is an example of a target. verb. A target is an item or objective that is the subject of an aim.

Two or three arrows have been depicted in the green area of the image, which is located very distant from the red location. Given that they are all in the same location, this illustrates the idea of weak or low precision and excessive precession.

As a result, choice B is accurate.

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Answer:

Mechanical Advantage of car jack is 20

Answer:

0.1 A

Explanation:

From the question,

V = IR............ Equation 1

Where V = Voltage, I = current, R = Resistance.

Given: I = 0.2 A, R = 10 ohms.

Substitute into equation 1

V = 0.2(10)

V = 2 volt,

If the resistor is replaced with a 20 resistor, The nwe current is

I = V/R................ Equation 2

I = 2/20

I = 0.1 A

Facilitated diffusion differs from ordinary diffusion in that (E) the rate of molecular movement is limited by the number of available carrier molecules. In contrast, ordinary diffusion does not rely on carrier molecules, so the rate of diffusion is not limited by their number.

Facilitated diffusion is a process in which a substance moves through a cell membrane without the requirement for energy. Facilitated diffusion requires membrane transport proteins to assist in the diffusion of certain molecules and ions throughout the cell membrane. The cell membrane proteins are known as transporters or carriers.

Molecules such as glucose, amino acids, and nucleotides can be transported using facilitated diffusion, which is the movement of molecules across the cell membrane down their concentration gradient. How does facilitated diffusion differ from ordinary diffusion? Facilitated diffusion differs from ordinary diffusion in the sense that the rate of molecular movement is limited by the number of available carrier molecules.

While ordinary diffusion occurs spontaneously, facilitated diffusion does not occur spontaneously but rather needs carrier proteins to help in the transport of molecules. In the case of facilitated diffusion, the carrier molecules aid in the movement of molecules from an area of high concentration to an area of lower concentration. Facilitated diffusion is a process that takes place across a semi-permeable membrane, where larger and more charged molecules must pass through protein channels to reach their final destination.

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The force that acts in a direction opposite to the motion of the moving object is called drag or air resistance.

Drag or air resistance is a force that acts on a moving object in a fluid medium, such as air or water, opposing its motion. It acts in a direction opposite to the motion of the object and is caused by the friction and pressure differences between the fluid and the object's surface. Drag force increases with the velocity of the object and its surface area, and it's usually modeled as a quadratic function of the velocity. For example, when a car is moving, the air resistance acts in the opposite direction of the car's motion, slowing it down. The drag force is not the only force that acts on the object, but it's one of the most significant forces acting on it, especially for objects moving at high speeds.

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(i) Kinetic energy of larger child is more (ii) larger child has more speed (iii) smaller child has more average acceleration

(i) The kinetic energy of the smaller child upon reaching the water will be less than that of the larger child. This is because the smaller child has less mass and therefore less kinetic energy. The larger child has more mass and therefore more kinetic energy.

(ii) The speed of the smaller child upon reaching the water will be less than that of the larger child. This is because the smaller child experiences air resistance and friction with the air during the jump, while the larger child does not experience any friction on the frictionless slide. As a result, the larger child will have a higher speed than the smaller child.

(iii) The average acceleration of the smaller child will be greater than that of the larger child during their motions from the platform to the water. This is because the smaller child experiences a greater amount of air resistance and friction with the air during the jump, which causes a greater amount of deceleration. The larger child, on the other hand, does not experience any friction on the frictionless slide and therefore does not experience as much deceleration.

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The substance is zircon, of which interference analysis is done.

Wavelength of light in solid = λ = 329 nm

Wavelength of light from he-ne laser = λ' = 633 nm

Interference effect = n =

= n =  λ' / λ

= n = 633 / 329

= n = 1.92

The interference, in physics, is the net effect of the combination of two or more wave trains moving on intersecting or coincident paths. The effect is that of the addition of the amplitudes of the individual waves at each point affected by more than one wave.

Thus the substance is zircon.

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Answer:

That is not true all objects fall at the same speed excepts things like feathers or paper.

Answer: false

Explanation: apex

Answer:

Velocity = 20.18 m/s

Explanation:

Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.

Mathematically, velocity is given by the equation;

\(Velocity = \frac{distance}{time}\)

\(V = \frac{d}{t}\)

Given the following data;

Distance, d = 3330m

Time, t = 165 secs

*To find the velocity*

Substituting into the equation, we have;

\(V = \frac{3330}{165}\)

Velocity = 20.18 m/s

Answer:

Speedometer. It's in the name.

One repetition of a metrical pattern is called a "foot." In poetry and prosody, a foot is the basic unit of measurement for meter, which is the rhythmic structure of a verse.

Repetition of a metrical pattern refers to the recurrence of a specific rhythmic structure or pattern in a poem or verse. In poetry, meter is a systematic arrangement of stressed and unstressed syllables that creates a rhythmic pattern. When a metrical pattern is repeated consistently throughout a poem, it helps establish a sense of rhythm and musicality.

Repetition of a metrical pattern serves several purposes in poetry. It helps create a musical quality, enhances the poem's flow, and establishes a predictable structure that can engage the reader or listener. Poets often use metrical patterns as a tool for conveying meaning, emphasizing certain words or ideas, or evoking specific emotions.

A foot typically consists of one stressed syllable and one or more unstressed syllables. Different types of feet include the iamb (an unstressed syllable followed by a stressed syllable, as in the word "about"), the trochee (a stressed syllable followed by an unstressed syllable, as in the word "happy"), the anapest (two unstressed syllables followed by a stressed syllable, as in the word "understand"), and the dactyl (a stressed syllable followed by two unstressed syllables, as in the word "elephant").

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Based on the findings of the group's t' analysis, it can be inferred that the period of a pendulum does depend on mass.

The fact that the group was able to distinguish between the two pendulum samples based on their periods suggests that there is a difference in the way that mass affects the period of a pendulum. This finding contradicts the idea that the period of a pendulum is independent of its mass. Additionally, the group's analysis indicates that the equation for calculating the period of a pendulum may have limitations that need to be considered when making measurements or predictions.
The group's t' analysis showed that the two pendulum samples they constructed were distinguishable. This suggests that the period of a pendulum is not independent of mass, as previously thought. The finding may be attributed to a difference in the way that mass affects the period of a pendulum. The group's analysis also revealed that the equation for calculating the period of a pendulum may have limitations that need to be considered when making measurements or predictions. These limitations may have led to the difference in periods between the two pendulum samples. Overall, this finding highlights the importance of considering mass when measuring or predicting the period of a pendulum.

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Answer:

:)

Explanation:

i need 5 points i really do :)

The statement that best describes the relative motions of the Pacific and Nazca plates is as follows:

Thus, the correct option for this question is C.

The Relative motion may be defined as the process that significantly involves the motion or speed of any object with respect to a particular point.

According to the context of this question, a mid-ocean ridge separates the Pacific plate and the Nazca plate off the western coast of South America. The relative motion of both these two plates with respect to South America possesses in a bidirectional manner. As the Pacific plate is moving to the west, and the Nazca plate is moving to the east.

Therefore, the correct option for this question is C.

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Answer:

it is320 m.

Explanation:

by formula

d= m/s×t

d= 8× 40

d=320 m

Answer:

320

Explanation:

The hot-reservoir temperature for refrigerator A is:

THA = THB / 2.52 = (240 K / 0.3) / 2.52 = 317.46 K

Let THA and TCA be the hot and cold reservoir temperatures, respectively, for refrigerator A, and let THB and TCB be the hot and cold reservoir temperatures, respectively, for refrigerator B.

We know that the coefficient of performance (COP) of a Carnot refrigerator is given by:

COP = TH / (TH - TC),

where TH is the temperature of the hot reservoir and TC is the temperature of the cold reservoir.

For refrigerator A, we have:

COP_A = THA / (THA - TCA)

For refrigerator B, we have:

COP_B = THB / (THB - TCB)

We are given that COP_A is 26% higher than COP_B. Therefore:

COP_A = 1.26 * COP_B

Substituting the expressions for COP_A and COP_B, we get:

THA / (THA - TCA) = 1.26 * (THB / (THB - TCB))

We are also given that the temperature difference between the hot and cold reservoirs is 30% greater for B than A. Therefore:

THB - TCB = 1.3 * (THA - TCA)

We can use these two equations to solve for TCA, the cold-reservoir temperature for refrigerator A:

THB - 1.3 * THA = (-0.3 * TCA) + 1.3 * TCB

Simplifying and rearranging, we get:

TCA = (THB - 1.3 * THA + 1.3 * TCB) / 0.3

Substituting TCB = 240 K and solving for TCA, we get:

TCA = (THB - 1.3 * THA + 1.3 * 240 K) / 0.3

We still need to find THB and THA to solve for TCA. We can use the ratio of COPs to set up an equation with THB and THA:

1.26 * (THB / (THB - 240 K)) = THA / (THA - TCA)

Multiplying both sides by (THA - TCA)(THB - 240 K), we get:

1.26 * THB * (THA - TCA) = THA * (THB - 240 K)

Expanding and simplifying, we get:

1.26 * THA * THB - 1.26 * THA * 240 K = THA * THB - THA * 240 K

Rearranging and factoring, we get:

(1.26 * THA - THA) * THB = 240 K * (1.26 * THA - THA)

Simplifying and solving for THB, we get:

THB = 1.26 * THA * (1 + (240 K / TCA))

Substituting this expression for THB into our earlier equation for TCA, we get:

TCA = (1.26 * THA * (1 + (240 K / TCA)) - 1.3 * THA + 312 K) / 0.3

Multiplying both sides by 0.3 and rearranging, we get a quadratic equation in TCA:

0.378 TCA^2 - 189.792 TCA + 9568.32 = 0

Solving this quadratic equation, we get two solutions: TCA = 300 K or TCA = 800 K. However, the coefficient of performance of a Carnot refrigerator cannot be greater than 1, so TCA must be less than THA. Therefore, the only valid solution is:

TCA = 300 K

Substituting TCA = 300 K into our equation for THB, we get:

THB = 1.26 * THA * (1 + (240 K / 300 K)) = 2.52 * THA

Therefore, the hot-reservoir temperature for refrigerator A is:

THA = THB / 2.52 = (240 K / 0.3) / 2.52 = 317.46 K

Rounding to three significant figures, the cold-reservoir temperature for refrigerator A is:

TCA = 300 K

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Answer:

what?

Explanation:

theres nothing

The value of inductance that should be used in series with a capacitor of 0.9 pF to form an oscillating circuit that will radiate a wavelength of 7.9 m is 1.26 x 10⁻⁷ H.

We can use the formula for the resonant frequency of an LC circuit to calculate the inductance required to form an oscillating circuit that will radiate a wavelength of 7.9 m. The resonant frequency of an LC circuit is given by:

f = 1 / (2π√(LC))

where f is the frequency of oscillation, L is the inductance in henries, and C is the capacitance in farads.

The speed of light is given by:

c = fλ

where c is the speed of light (approximately 3 x \(10^8\) m/s), f is the frequency of oscillation, and λ is the wavelength of radiation.

We want the oscillating circuit to radiate a wavelength of 7.9 m, so we can write:

f = c / λ = (3 x \(10^8\)m/s) / (7.9 m) = 3.80 x \(10^8\) Hz

We are given that the capacitance is 0.9 pF, or 9 x 10^-13 F. Substituting these values into the equation for resonant frequency, we get:

3.80 x\(10^7\) Hz = 1 / (2π√(L (9 x \(10^-13\)F)))

Solving for L, we get:

L = 1 / (4π²(3.80 x 10⁷ Hz)²(9 x 10⁻¹³ F)) = 1.26 x 10⁻⁷ H

Therefore, the value of inductance that should be used in series with a capacitor of 0.9 pF to form an oscillating circuit that will radiate a wavelength of 7.9 m is 1.26 x 10⁻⁷ H.

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