The development and use of alternative energy source is very necessary in present day world. Explain this statement.​

It will take  103 minutes  to plate out 16. 22 g of al metal from a solution of al 3 using a current of 12. 9 amps in an electrolytic cell

Electrolytic cell, any device in which electrical energy is converted to chemical energy, or vice versa. Such a cell typically consists of two metallic or electronic conductors (electrodes) held apart from each other and in contact with an electrolyte (q.v.), usually a dissolved or fused ionic compound

First, look at the reaction to decided how many moles of electrons it will take:

Al3+ + 3e ------> Al(s)

It takes 3 electrons to convert 1 mole of Al3+

Next, figure out how many moles of Al metal you want:

I mole of Al mass = 26 g

1 g of Al will have = 1/26 moles

16. 22 g of al metal will have = 16.22 / 26 moles 0.624 moles

since , their are 3 electrons

0.624 x 3= 1.87 moles of electrons

using Faraday constant to find the number of coulombs (C) needed:

1 faraday = 96500 C per mole

1.87 x 96500 = 180455

Since,  1 amp = 1 C/sec,, time needed to supply a current of 12.9 amp will be

80455C  / 12.9 C = 6236.82 sec = 103 minutes

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The potential energy at x = 8 m is -2000 V and at x = 2 m is 400 V. The magnitude and direction of the electric field will be 400 V/m directed parallel to the +x-axis

Electric field, an electric property associated with each point in space when charge is present in any form. The magnitude and direction of the electric field are expressed by the value of E, called electric field strength or electric field intensity or simply the electric field.

The electric potential energy of any given charge or system of changes is termed as the total work done by an external agent in bringing the charge or the system of charges from infinity to the present configuration without undergoing any acceleration.

The relation between electric field and electric potential can be generally expressed as – “Electric field is the negative space derivative of electric potential.”

Electric field = - d V / dx

-(-2000-400) = [tex]\int\ {E} \, dx[/tex]

2400 = E (8-2)

2400 V = E (6)

E = 400 V/m

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The core of each giant planet is made up of rocky materials, which is 5 to 10 times the mass of earth.

To find the answer, we have to know more about the rocky materials.

Thus, we can conclude that, the core of each giant planet is made up of rocky materials, which is 5 to 10 times the mass of earth.

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In order to cause electrons to be ejected from the surface of this metal you should use light of a shorter wavelength.

The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons. The phenomenon is studied in condensed matter physics, and solid state and quantum chemistry to draw inferences about the properties of atoms, molecules and solids. The effect has found use in electronic devices specialized for light detection and precisely timed electron emission.

This process is also often referred to as photoemission. In terms of their behaviour and their properties, photoelectrons are no different from other electrons. The prefix, photo-, simply tells us that the electrons have been ejected from a metal surface by incident light.

The photons of a light beam have a characteristic energy, called photon energy, which is proportional to the frequency of the light. In the photoemission process, when an electron within some material absorbs the energy of a photon and acquires more energy than its binding energy, it is likely to be ejected. If the photon energy is too low, the electron is unable to escape the material. Since an increase in the intensity of low-frequency light will only increase the number of low-energy photons, this change in intensity will not create any single photon with enough energy to dislodge an electron. Moreover, the energy of the emitted electrons will not depend on the intensity of the incoming light of a given frequency, but only on the energy of the individual photons.

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What mechanisms function to localize sound in the horizontal and vertical planes?

Horizontal sound localization results from two mechanisms: interaural time delay and interaural intensity difference.

The capacity to pinpoint the position or source of a detected sound in terms of distance and direction is known as sound localization.

Numerous studies have been conducted on the mammalian auditory system's sound localization mechanisms. The auditory system uses a variety of indicators, such as spectral information, timing difference, level difference (or intensity difference) between the ears, and others, to locate the source of sound. Other animals, including birds and reptiles, employ these cues as well, however there may be variances in how they are used. In addition, there are localization cues that are not present in the human auditory system, such as the results of ear movements. It is obvious that animals that can localize sound have an evolutionary advantage.

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Copernicus's model of the universe differs from Ptolemy's because Copernicus believed the Sun is at the center of the universe and majority of the bodies in the universe revolves around the Sun.

The universe is defined as the open place that contains the planets, stars, galaxies, and all other forms of matter and energy.

There are different models of the universe including which contains the Copernicus's model and Ptolemy's model.

The Copernicus's model of the universe differs from Ptolemy's because Copernicus believed the Sun is at the center of the universe and majority of the bodies in the universe revolves around the Sun.

While the Ptolemy's model of the universe differs from the Copernicus's model because Ptolemy believed that the Earth is at the center of the universe and everything in the universe revolves around the Earth.

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Answer:

56.18 grams because you have to round it off

The total energy contained in 1 mol of photons is 109.75 KJ / mol

Given,

Frequency =  2.75 × 10 ^ 14 hz

We know that, Energy = Number of photons × Energy in one photon

                                      = n h v

                                      = (6.023 × 10^23) × ( 6.626 × 10^-34) ×( 2.75×10^14)

                                      =109.75 KJ/mol

Concepts

The total energy of a system is the sum of its gravitational potential and kinetic energy, and this total energy is preserved in orbital motion. To depart a planet and not return, objects should have a minimum velocity, known as the Escape Velocity

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The you see a fish off to your right is actually farther to the left in the direction you’re looking due to refraction of light.

Refraction of light is the bending of light rays as the cross the boundary between two media of different densities.

When light travels from a less dense to a denser medium, the ray of light is bent closer towards the normal. However, when the ray of light is travelling from a denser to a less dense medium, the ray of light is bent away from the normal.

Considering the situation in seeing a fish through an aquarium. Light rays from the water which is less dense than air travels to the eyes and is bent away from the normal. Therefore, the fish seen straight ahead is actually, farther to the left.

In conclusion, refraction of light causes the apparent change in the position of the fish.

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The nebular hypothesis explains how our solar system probably formed from a giant cloud of gases and dispersed solid particles.

The most widely accepted theory in cosmogony to explain how the solar system formed and evolved is the nebular hypothesis. It implies that gas and dust orbiting the sun are what created the solar system.

Following are the steps in nebular theory:

The nebular hypothesis states that enormous clouds of hydrogen and helium imploded. The cloud's center heated up significantly after collapsing. The system then started to rotate as it became hotter and more compressed. The formation of the solar system started at this point.

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You should push the accelerator all the way to the floor and hold for five seconds if your engine is flooded with gasoline.

To find the answer, we need to know about the flooded engine.

Thus, we can conclude that, You should push the accelerator all the way to the floor and hold for five seconds if your engine is flooded with gasoline.

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The change in potential energy of the proton is  5.6 x [tex]10^{-17}[/tex] Joule

A uniform electric field is where the electric field strength is the same at all points in the field. In the uniform field, the force experienced by a charge is the same no matter where it is placed in the field.

Given that a proton moves a distance 10 cm in a uniform electric field of 3.5 kN C, in the direction of the field.

The Work done = Fd

but F = Eq

Recall that Electric field E = F/q = V/d

Where V = potential difference.

Let us first calculate the V

E = V/d

V = Ed

Substitute all the parameters into the formula above

V = 3.5 × 10³ × 0.1

V = 350 v

from F/q = V/d

make F the subject of formula and substitute it in work formula

F = Vq/d

W.D = Vq/d x d

W.D = Vq

Substitute all the parameters into the formula above

W.D = 350 x 1.6 x [tex]10^{-19}[/tex]

W.D = 5.6 x [tex]10^{-17}[/tex] J

Work done = Energy = Potential Energy

Therefore, the change in potential energy of the proton is 5.6 x [tex]10^{-17}[/tex] Joule

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The runner's achilles tendon stretch is 5mm.

What is Young's modulus?

Young's modulus (Y) is described by the following expression.

[tex]Y = \frac{F \times L}{ΔL \times A } [/tex]

where,

F=force exerted on the tendon

A=area

∆L=change in length (streching)

The force in this case is 8 times the weight of the runner

F=8×m×g

F=8×70×9.8

F=5488N

therefore,the change in length of the tendon is given by

[tex]Δ = \frac{F \times L}{ Y \times A } [/tex]

[tex]ΔL = \frac{5488 \times 0.15}{0.15 \times 10 {}^{10} \times 1.1 \times 10 {}^{ - 9} } [/tex]

ΔL=0.00498m

The runner's achilles tendon will stretch by 0.004989m which is approx.5mm

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Separately derived system generators shall have the neutral conductor sized not smaller than required to carry the maximum unbalanced current as determined by NEC Article 220.61.

Charged material experiences a force when it is exposed to an electromagnetic field due to the physical property of electric charge. You can have a positive or negative electric charge.

Electric current is defined as the charge per unit of time.

The mathematical relation between current and the electric charge

I =Q/T

Generators are basically motors that operate in reverse—they produce electricity when rotated, instead of rotating when supplied with electricity

The conductors that come from generators must be sized, and overload protection is required. But compared to similar considerations for motors, these considerations are much simpler.

Thus, The neutral conductor on separately derived system generators must be no smaller than necessary to carry the maximum unbalanced current as specified by NEC Article 220.61.

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The bisecting-angle instrument (bai) uses aiming rings to determine the correct pid angulation.

This instrument is commonly used in dental medicine and radiography so as to achieve short cone technique x-rays.

It however employs the use of aiming rings for accuracy to determine the correct position-indicating device angulation thereby making it the most appropriate choice.

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A Final statement or concluding statement

No because this method of dating requires a material that was once living. So, this technique wouldn’t have worked.

Carbon 14 gradually decays into other elements. However, when a plant or animal dies, it no longer has the ability to accumulate new carbon 14, and the supply in the organism at the time of death is gradually depleted.

Scientists can calculate the time elapsed since something died from its residual carbon 14 because the rate of depletion has been accurately determined (half of any given amount of carbon 14 decays in 5,730 years).

However, scientists have long recognized that carbon dating is subject to error due to a variety of factors, including contamination from outside carbon sources. As a result, they sought methods to calibrate and correct the carbon dating method.

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Speed of light relative to the boys = 300,000,000 m/s

Speed of light relative to a stationary observer on the side of the road =

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Answer:

first answers are 25 & 35, second answers are both 300,000,000

Explanation:

The recessional velocity of a galaxy at a distance of 180 mpc will be 70 km/sec

Hubble's law, which says simply that a galaxy's velocity (or as is sometimes plotted, its redshift) is directly proportional to its distance, also tells us something important about the state of the universe. If the universe is static and unchanging, there should be no correlation between distance and velocity.

Recessional velocity is the rate at which an extragalactic astronomical object recedes (becomes more distant) from an observer as a result of the expansion of the universe. It can be measured by observing the wavelength shifts of spectral lines emitted by the object, known as the object's cosmological redshift.

Recessional velocity = Hubble's  constant *  distance

                                  = 70 km/sec/Mpc * 180 Mpc

                                  = 70 km/sec

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Southern hemisphere winds moving surface water 90 degrees to the left of the direction of the wind is a true statement.

This is referred to as the natural movement of air and other gases present in the atmosphere.

In the southern hemisphere, the surficial ocean waters which are moved by wind will result in a net perpendicular leftward movement to it thereby making it the most appropriate choice.

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The resistance of the furnace is 2.4 ohm

Given,

P=24kW, V=240v,

P=[tex]\frac{V^{2} }{R}[/tex],  24kW=[tex]\frac{240^{2} }{R}[/tex], Therefore R=2.4 ohm

A force that opposes the flow of current is electrical resistance, often known as resistance to electricity. It acts as a gauge for how challenging it is for current to flow in this fashion. Ohms (), which represent resistance values, are used. Electricity will move from high to low when an electron difference exists between two terminals. This flow is opposed by resistance. Lower currents occur at higher resistance levels. The opposite is also true: the current increases as the resistance decreases. The Greek letter omega (), which represents resistance, represents ohms. German physicist Georg Simon Ohm (1784–1854), who investigated the connection between voltage, current, and resistance, is the name given to the unit of resistance known as an ohm. Ohm's Law was developed under his direction.

A 24-kw electric furnace is connected to a 240-v line. what is the resistance of the furnace? group of answer choices

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Intensity of laser beam is 72.3W/m²

Given:

average power output = 0. 250 mw

To Find:

intensity of laser beam

Solution:

First of all, we need to find the area of the circular spot, which is given by:

A = πr^2

where r is the radius of the spot, which is half the diameter, therefore

r = d/2 = 2.10mm/2 = 1.05mm = 1.05 x 10^-3m

So, the area of the spot is

A = π(1.05 10^-3m)^2 = 3.46 10^-6m²

We know that the power output of the laser is

P = 0.250mW = 2.5.10^-4W

So the intensity of the laser beam is

I = P/A = 2.5^-10 W/3.46-10^-6m^2 = 72.3W/m²

So, intensity of laser beam is 72.3W/m²

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The radio region of the electromagnetic spectrum is where molecular clouds with extremely low temperatures emit the majority of their light.

To find the answer, we need to know more about the molecular clouds.

Thus, we can conclude that, the radio region of the electromagnetic spectrum is where molecular clouds with extremely low temperatures emit the majority of their light.

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When the range of one or both of the variables is restricted, the correlation will be decreased

Restriction of range is the term applied to the case in which observed sample data are not available across the entire range of interest.

Correlation is a statistical measure (expressed as a number) that describes the size and direction of a relationship between two or more variables. A correlation between variables, however, does not automatically mean that the change in one variable is the cause of the change in the values of the other variable.

Restricted ranges affect correlations. In fact, when the range is restricted, a peculiar phenomenon happens: the correlation coefficient goes down. The range restriction causes the standard deviation of the variable x to shrink which reduces the correlation of x to some variable y. Analogue, range restriction can also affect the coefficients in multiple regression

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Answer:

c. a bicycle locked to a bike rack

Answer: Option (C). A bicycle locked to a bike rack.

Aluminium has a work function of 4. 08 eV. The cutoff wavelength and cutoff frequency for the photoelectric effect is 303.9nm and 911.7× 10¹⁷ s⁻¹ respectively.

Work Function is the minimum energy required to eject an electron from a photoelectric material.

Cutoff Wavelength is the maximum wavelength below which electron will be ejected

Cutoff Frequency is the minimum frequency required to eject electron.

Let the work function of Aluminium be Φ

Given,  work function Φ = 4.08eV

We know that hc/λ =  Φ

where, h is Planck constant

c is speed of light

λ is wavelength of light used

Hence, on subsitution

1240 / λ = 4.08 eV          (hc = 1240)

⇒ λ = 303.9 nm

Hence, cutoff wavelength used is 303.9 nm

We know that ν = c/λ

ν = 3 × 10⁸ / 303.9

⇒ ν = 911.7 × 10¹⁷ s⁻¹

Hence, cutoff frequency used is 911.7 × 10¹⁷ s⁻¹

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The momentum of a tiger that has a mass of 81 kg and runs with a velocity of 5. 4 m/s to the east will be  437.4 Kg m/s in east direction.

Momentum is a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity broadly .It is a property of a moving body that determines the length of time required to bring it to rest when under the action of a constant force.

momentum = mass * velocity

given

mass of tiger = 81 kg

velocity of tiger = 5.4 m/s

since ,

momentum = m * v

                   = 81 * 5.4 = 437.4 Kg m/s

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When transporting cylinders contain used refrigerant?

What must be done before shipping any used refrigerant in a cylinder?

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Answer:

spring force = -K × x , where X is elongation or compression in the spring. ( -) sigh shows that the spring force is opposite to the applied force to cause extension.

Potential energy = work done by spring force = integration of Force.

integrate the force (-K × x) over distance 0 to x .

U = 1/2 K × X^2 ( for elongation)

U = -1/2 × K × X^2 ( for compression)

The magnitude of the force experienced by a 1. 0 c charge placed at the location of the test charge is 4.5*10^8N.

To find the answer, we have to know more about the force experienced between two charges.

                [tex]Q_1=5C\\Q_2=1C\\r=10m.[/tex]

               [tex]F=\frac{kQ_1Q_2}{r^2}[/tex]

where, k=8.99*10^9.

          [tex]F=\frac{8.99*10^9*5*1}{10^2} =4.5*10^8N[/tex]

Thus, we can conclude that, the magnitude of the force experienced by a 1. 0 c charge placed at the location of the test charge is 4.5*10^8N.

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