it is known that the electric force of repulsion between two electrons is much stronger than the gravitational attraction. for two electrons at a distance d apart, calculate the ratio of the size of the electrostatic repulsion to that of the gravitational attraction.

Answer: The evidence described in the given statement, specifically the absence of ocean sediments at the mid-ocean ridge and the thicker sediments moving away from the ridge, supports the concept of sea-floor spreading, which is a key aspect of the plate tectonic theory.

The evidence described in the statement supports the concept of sea-floor spreading, which is a fundamental aspect of the plate tectonic theory. Sea-floor spreading is the process by which new oceanic crust is formed at mid-ocean ridges through the upwelling of molten material from the Earth's mantle, and then moves away from the ridge in opposite directions, creating a continuous process of crustal formation and spreading.

The absence of ocean sediments at the mid-ocean ridge is consistent with sea-floor spreading because the ridge is the site of crustal formation where molten material is constantly welling up and creating new oceanic crust. As the newly formed crust moves away from the ridge, it is relatively young and has not had enough time to accumulate significant amounts of sediment. This is why sediments are absent or thin at the mid-ocean ridge.

On the other hand, as the oceanic crust moves away from the ridge and gets older, it accumulates sediment from various sources, such as weathering of continents and deposition of marine organisms. This is why the sediments get thicker moving away from the ridge, as mentioned in the statement.

This evidence from sediment cores collected by the Deep Sea Drilling Project provides support for the concept of sea-floor spreading, as it confirms the pattern of sediment distribution observed in ocean basins and is consistent with the idea that new crust is constantly forming at mid-ocean ridges and spreading away from them, contributing to the overall movement of tectonic plates on the Earth's surface.

Therefore, the correct answer is A) sea-floor spreading.

Answer:free coins grinding up get rekts LOl

Explanation:

An example of no work after the effort is work done by the collie to travel a distance in a straight line by lifting a mass.

In physics, the word "work" involves the measurement of energy transfer that takes place when an item is moved over a range by an externally applied, at least a portion of which is applied within the direction of the displacement.

The length of the path is multiplied by the element of a force acting all along the path to calculate work if the force is constant. The work W is theoretically equivalent towards the force f times the length d, or W = fd, to portray this concept.

The amount of work done by the coolie to travel a certain distance in a straight line by lifting a certain amount of mass. Here the work done is zero because when the coolie lifted the mass the force exerted in the upward direction makes an angle of 90° and as per the formula of work done it will be equal to zero.

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Conversion of electromagnetic (EM) energy from the sun into other forms of energy occurs for the following options:

a. Biofuels

c. Solar thermal power

e. Wind power (EM to air movements)

A- Biofuels: During photosynthesis, plants capture electromagnetic energy from the sun and convert it into chemical energy, stored in the bonds of organic molecules, such as glucose. This process allows for the conversion of EM energy to chemical energy in the form of biofuels.

c. Solar thermal power: Solar thermal power plants use mirrors or lenses to concentrate sunlight, which is then converted into heat energy. This thermal energy can be used to generate steam, which drives a turbine and produces mechanical energy.

e. Wind power: Wind turbines harness the kinetic energy of moving air, which is ultimately driven by the sun's uneven heating of the Earth's surface. The sun's energy heats the atmosphere, creating temperature and pressure gradients that result in wind currents.

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Light waves impact how color is perceived through a process called color perception, where different wavelengths of light interact with our visual system.

Color perception is influenced by the interaction between light waves and the receptors in our eyes. The visible spectrum ranges from shorter wavelengths (blue and violet) to longer wavelengths (red and orange). When light waves from an external source, such as sunlight or a colored object, enter our eyes, they interact with specialized cells called cones, which are sensitive to different ranges of wavelengths.

Each cone type is most sensitive to a specific range of wavelengths, and their responses are interpreted by the brain as different colors. For example, cones that are sensitive to shorter wavelengths are responsible for perceiving blue, while cones sensitive to longer wavelengths perceive red. The combination and intensity of signals from different cone types determine the overall perception of color.

An example of how light waves impact color perception is the phenomenon of color mixing. When different colors of light are mixed, their wavelengths combine, resulting in new perceived colors. For instance, combining red and blue light waves can create the perception of purple.

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Answer:

The resultant is the vector sum of two or more vectors. It is the result of adding two or more vectors together. If displacement vectors A, B, and C are added together, the result will be vector R. ... If two or more force vectors are added, then the result is a resultant force.

Explanation:

Answer:

It would lift the object to the same height than before you move it 3 centimeters to the left. You see, the height doesn't change if you move the inclined plane horizontally, because height is a vertical variable.

Therefore, if the inclined plane has a height of 1 meters, then the object will be lifted 1 meters up, no matter if you move the inclined plane 50 meters horizontally, it won't change its height.

Because of shorter wavelength, Blue light would release electrons with more kinetic energy. Yellow light would generate more electrons.

Blue and yellow light must have different intensities for the yellow light to emit electrons with more kinetic energy.

The yellow light must be more intense than the blue light since both lasers send the same amount of energy to the metal surface. The yellow light must therefore produce more electrons.

The expelled electrons must have a higher kinetic energy since the wavelength of blue light is shorter.

It is demonstrated by the photoelectric effect that light can behave like a particle. When photons are shone on a metal surface, electrons are expelled from the surface of the metal, which causes the photoelectric effect.

When compared to green light, the higher energy blue light ejects electrons with more kinetic energy.

No electrons are released by light below a specific frequency. In contrast, light exceeding that threshold frequency can emit electrons even at modest intensities. Electron ejection speed appears to be frequency dependent, with an increase in frequency resulting in an increase in speed.

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Answer:

this question makes no sense

Explanation:

like how do you get this question

Answer:They require more energy to break intermolecular forces hence polar molecules have higher melting points and boiling points than non-polar molecules of similar size, shape and number of electrons.

Explanation:

The frequency ()of photons to break the O-H bond is 1.1704 ✕ 1015 Hz.

Here, it is given that

The bond energy of O-H per mole=E =467 kJ/mol

Convert the unit of bond energy from kJ to J by using a conversion factor:

1kJ =1000 J

467 kJ/mol = 467 ✕ 103 J /mol

Determine the bond energy for 1 molecule of water (H2O) as:

E = Bond energy per mole / Avogadro’s number (NA)

E = (467 ✕ 103 ) / (6.022 ✕ 1023 )

=  77.55 ✕ 10-20 J

Thereby, the energy required to break 1 molecule of H2O is 77.55 ✕ 10-20 J

Now, determine the frequency in Hz by using a relation:

E=h

Where ‘’ is the frequency of the photon and ‘h’ is the Planck’s constant whose value is 6.626  ✕ 10-34 J/s.

Putting all the values we get,

(77.55 ✕ 10-20 J) = (6.626  ✕ 10-34 J/s) ✕

= (77.55 ✕ 10-20 J) / (6.626  ✕ 10-34 J/s)

= 11.704  ✕ 1014 s-1

= 1.1704 ✕ 1015 s-1

So,  =1.1704 ✕ 1015 Hz

Therefore, the frequency ()of photons to break the O-H bond is 1.1704 ✕ 1015 Hz.

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The exiting electron has an energy of 6.03 x 10⁻¹⁹J

The photoelectric effect is the emission of electrons while electromagnetic radiation, which includes light, hits a material. Electrons emitted in this way are referred to as photoelectrons.

In keeping with the well-known Einstein explanation of the photoelectric impact: The electricity of the photon could be sum total of electricity needed to put off the electron and kinetic energy of the emitted electron. consequently h nu= W + E.

The photoelectric effect is the manner wherein the electricity from electromagnetic radiation, together with visible light, gamma radiation or different hits an atomic electron wherein the power of the radiation is transferred in its entirety to the electron causing the electron to be ejected from the atom.

Calculation:-

KE =  hv - work function

    = 6.626 × 10⁻³⁴ ×1.8 x 10¹⁵ - 5.9 x 10⁻¹⁹

    = 11.93 x 10⁻¹⁹ -  5.9 x 10⁻¹⁹

    = 6.03 x 10⁻¹⁹ J

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The traveler's weight on another planet whose radius is 3 times that of Earth and whose mass is 2 times that of Earth is 21.647 N

The following is the solution to the given problem:

Mass and gravity are related to one another. Gravity is generated by the planet's mass, and the magnitude of the gravitational force is determined by the mass of the planet on which the object is situated, as well as the mass of the object.

Mass, distance, and gravity are all factors that influence the gravitational force. Mass is directly proportional to the gravitational force and inversely proportional to the square of the distance from the gravitational force's center.

Here is the formula: Force of gravity = G(M1M2)/d²where, G is the gravitational constant 6.67 x 10^{-11} N(m/kg)^2, M1 is the mass of the first body, M2 is the mass of the second body, d is the distance between the centers of two bodies.

On earth, the traveler weighs 682 N. On another planet whose radius is 3 times that of Earth and whose mass is 2 times that of Earth, we have to calculate the traveler's weight.

Mass of Earth is 5.972 × 10^24 kg2,

Radius of Earth is 6.371 x 10^63.

The mass of the planet whose radius is 3 times that of Earth and whose mass is 2 times that of Earth.

Mass of the planet = 2 x mass of Earth = 2 x 5.972 × 10^24 kg = 1.1944 × 10^25 kg4.

The radius of the planet whose radius is 3 times that of Earth,

Radius of the planet = 3 x radius of Earth = 3 x 6.371 x 10^6 m = 1.9113 × 10^7 m5.

The distance between the two planets.

Distance between two planets = radius of planet + radius of Earth

= 1.9113 × 10^7 m + 6.371 x 10^6 m

= 2.54813 x 10^7 m

= 2.54813 x 10^10 cm.

Putting all the values in the formula.

Force of gravity = G (M1 M2) / d²

Where, Mass of the traveler on the other planet is m.

Mass of the Earth is M1 = 5.972 × 10^24 kg.

Mass of the other planet is M2 = 2 x 5.972 × 10^24 kg = 1.1944 × 10^25 kg.

Radius of the Earth is r1 = 6.371 x 10^6 m.

Radius of the other planet is r2 = 3 x 6.371 x 10^6 m = 1.9113 × 10^7 m.

Distance between the two planets is d = 2.54813 x 10^10 cm.682

= G (M1 M2)/d²

G = 6.674 × 10^-11 N m² / kg²

Force of gravity on other planet = G(mM2)/r² where m is the mass of the traveler on the other planet

= 6.674 × 10^-11 × (m × 1.1944 × 10^25)/(1.9113 × 10^7)²

Weight on another planet = force of gravity on another planet × mass of the traveler on another planet

= (6.674 × 10^-11 × (m × 1.1944 × 10^25)/(1.9113 × 10^7)²) × m

= 21.647 N (approximately)

Therefore, the traveler's weight on another planet whose radius is 3 times that of Earth and whose mass is 2 times that of Earth is 21.647 N (approximately).

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Answer:

Water breaking down into hydrogen and oxygen is a decomposition reaction

Hydrogen and oxygen combining to form water is a synthesis reaction

Explanation:

A decomposition reaction is a chemical reaction that involves the breakdown of a chemical reactant entity into two or more simpler product fragments

Water H₂O undergoes a decomposition reaction by breaking down into hydrogen, H₂,, and oxygen, O₂, as follows;

2H₂O (l) → 2H₂ (g) + O₂ (g)

A synthesis reaction is a reaction that involves the chemical combination of two or more dissimilar molecules or atoms to produce a different compound or molecule

Water, H₂O, is formed by a synthesis reaction of hydrogen, H₂,, and oxygen, O₂, combining as follows;

2H₂ + O₂  → 2H₂O

The lower temperature of the second Carnot-engine is 160 K, which is 200K .

The efficiency of a Carnot-engine is given by the formula e = 1 - Tc/Th, where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir. Since both engines have the same efficiency, we can set their efficiency expressions equal to each other:
1 - Tc1/Th1 = 1 - Tc2/Th2
We are given the temperatures of one engine and the hot reservoir of the other engine:
Th1 = 5.0 × 10^2 K
Tc1 = 3.0 × 10^2 K
Th2 = 4.0 × 10^2 K
We can solve for Tc2:
1 - 3.0 × 10^2 K/5.0 × 10^2 K = 1 - Tc2/4.0 × 10^2 K
Tc2/4.0 × 10^2 K = 2/5
Tc2 = 1.6 × 10^2 K

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Answer:

Explanation:

After much working on this, I got the force between A and C to be 12 and the force between B and C to be 9. the total force I found then was 15 N at 53 degrees. I used the angle between A and C as 90 degrees and the angle between B and C to be 0 )I just rotated the right triangle a bit to make it easier to work with).

The largest producer of primary air pollution in the United States is what? electricity producing plants.

Answer:

electricity production

Explanation:

\( \sf \nu \: = \lambda \times \upsilon\)

\( \sf \nu = 3 \times 15\)

\( \sf \nu \: = 45 \: m/s\)

➪The speed of ocean waves is 45 m/s...~

idrk im jus here for the points\(\geq \geq \geq \geq \geq \geq \geq\)

Answer: The magnitude of the change is 27.6 Vs.

Explanation:

To calculate the change in magnetic flux, we can use the formula:

emf = -dΦ/dt

where emf is the induced emf, Φ is the magnetic flux through the coil, and t is time.

we can see that the induced emf is 0 V when the inverse of time is 0. We can also see that the maximum induced emf is 9.2 V when the inverse of time is 1. Therefore, the change in emf is:

Δemf = 9.2 V - 0 V = 9.2 V

To convert this to the change in magnetic flux, we need to rearrange the formula:

dΦ = -emf/dt

The time interval between the two points on the graph is 1/3 s (since the inverse of time is 1 at the vertical line). Therefore:

dΦ = -(9.2 V)/(1/3 s) = -27.6 Vs

Since the change in magnetic flux is negative, this means that the flux is decreasing. The magnitude of the change is 27.6 Vs.

is this correct??

Complete Question:

What is the power in a circuit that has a current of 12 amps and a resistance of 100 ohms?

Answer:

D. 14,400 watts

Explanation:

The electrical power of an electric circuit can be defined as a measure of the rate at which energy is either produced or absorbed in the circuit.

Mathematically, electrical power is given by the formula;

\( Electrical \; power = current * voltage \)

This ultimately implies that, the quantity (current times voltage ) is electrical power and it is measured (S.I units) in Watt (W).

Given the following data;

To find the power in the circuit, we would use the following formula;

Power = I²R

Where;

Power = 12² * 100

Power = 144 * 100

Power = 144,000 Watts

Answer:

False

Explanation:

Just took the test

False, because hypochondriacs think they have a significant, undetected medical ailment even when testing reveal they are healthy.

A hypochondriac is someone who, despite diagnostic testing showing they have no health issues, lives in constant anxiety that they have a terrible, undetected medical illness. They are obsessed with the concept that they suffer from a major illness that has gone untreated.

In adults, hypochondriasis often begins to manifest. Among the symptoms are a persistent, strong anxiety of developing a major illness and concern that seemingly little symptoms portend a larger problem. A patient may change physicians or see them regularly.

Medication and counselling could be helpful.

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The surface temperature of a planet with a one-layer atmosphere, solar constant S = 2,000 W/m^2, and albedo alpha = 0.4 is approximately 303.7 K (or 30.6°C).

The main answer is derived using the Stefan-Boltzmann law, which states that the power radiated by a black body is proportional to the fourth power of its temperature. The solar constant represents the total power received from the Sun per unit area outside the atmosphere, and the albedo accounts for the fraction of sunlight that is reflected back into space. With an albedo of 0.4, 60% of the incoming solar energy is absorbed by the planet's surface.

During a war on the planet, the detonation of numerous nuclear weapons releases vast amounts of dust and smoke into the atmosphere. This changes the properties of the atmosphere, causing it to become opaque to visible radiation. As a result, the atmosphere now absorbs a significant portion of the incoming solar energy, preventing it from reaching the planet's surface directly. However, the atmosphere still retains its ability to absorb infrared radiation.

In this new situation, a diagram similar to Figure 4.6 can be drawn to illustrate the fluxes. The incoming solar radiation is now partially absorbed by the atmosphere, represented by a downward arrow labeled "Absorbed by Atmosphere." The remaining solar radiation that manages to pass through the atmosphere is represented by a downward arrow labeled "Absorbed by Surface."

The surface, in turn, emits thermal radiation, shown as an upward arrow labeled "Emitted by Surface," which is absorbed by both the atmosphere and space.

To calculate the planet's surface temperature, we need to consider the balance between the absorbed solar radiation and the emitted thermal radiation. The absorbed solar energy is now divided between the atmosphere and the surface. The emitted thermal radiation from the surface is partially absorbed by the atmosphere and partially radiated out into space. By solving this energy balance equation, we can determine the new equilibrium temperature of the planet's surface.

After the nuclear war, the planet's surface temperature is likely to decrease compared to its initial value. This is because a significant portion of the incoming solar energy is now absorbed by the atmosphere instead of reaching the surface. With less energy available to heat the surface, it will cool down. The term "nuclear winter" is often used to describe this phenomenon, as it results in a significant drop in temperature and can have widespread climatic effects.

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To go out and find more such types l stars, a kind of instrument to use the sensitive infrared telescope.

Infrared telescope, a device designed to discover and resolve infrared radiation from resources outside Earth's atmosphere consisting of nebulae, young stars, and gas and dust in different galaxies.

Infrared telescopes may be floor-based totally, air-borne, or area telescopes. They include an infrared camera with a special stable-kingdom infrared detector which must be cooled to cryogenic temperatures.

Ground-based total telescopes have been the first for use to study outer space in infrared. near-infrared gadgets have a tendency to promote topical healing and slight pain remedy quite efficiently, but a long way infrared heating devices are distinctly effective at putting off toxins, enhancing circulation, and relaxing the muscle groups.

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The cross product of A and B is perpendicular to both A and B.

A × B = (4i + 2j + 2k) × (4i - 4j + 8k)

A × B = 16 (i × i) - 16 (i × j) + 32 (i × k) + 8 (j × i) - 8 (j × j) + 16 (j × k) + 8 (k × i) - 8 (k × j) + 16 (k × k)

A × B = -16 (i × j) - 32 (k × i) - 8 (i × j) + 16 (j × k) + 8 (k × i) + 8 (j × k)

A × B = -16k - 32j - 8k + 16i + 8j + 8i

A × B = 24i - 24j - 24k

The magnitude of A × B is

||A × B|| = 24 ||i - j - k|| = 24√3

Dividing A × B by its magnitude gives a unit vector,

(A × B)/||A × B|| = 1/√3 (i - j - k)

Answer: (b) the night would be half as long

Explanation: As the earth, if rotated twice as fast than it does now and the sun stayed the same then the night would be as half as long as the rotation of the planet on its axis would be double to that of its and 12 hours of night would be as long as the speed of the axial rotation.

"When two 501 g blocks of wood are placed on a frictionless surface, 1.88 m apart, and the bullet stops, the second block moves at a speed of 2.148 m/s. 434 m/s is the velocity of a 10.44 g bullet."

Mass of the block is given as 501 g

Blocks are separated by the distance x metres.

The weight of the bullet is 10.44 g

Initial velocity of the bullet is 434 m/s.

Final velocity of the block is 6.85 m/s.

The bullet's speed as it travels through the first block will initially be determined as follows,

m u + m v = M v

10.44(434) = 10.44 v + 501(6.85)

4530.96 = 10.44 v + 3431.85

10.44 v = 1099.11

v = 105.27 m/s

Velocity of the second block v' = m/(m + M) 105.27

v' = 10.44/(10.44 + 501) 105.27 = 10.44/511.44 × 105.27 = 2.148 m/s

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Answer:

C

Explanation:

V-V₀=at

a=(V-V₀)/t

a=(10-20)/5=-2 m/s²

Acceleration of the car is -2 m/s²

A shuffleboard disk is accelerated at a constant rate from rest to a speed of 6.0 m/s over a 1.8 m distance by a player using a cue. at this point the disk loses contact with the cue and slows at a constant rate of 2.5 m/s2until it stops. Therefore, it takes about 3 seconds to elapse from, when the disk begins to accelerate until it stops. It is because,

Given, u = 0 m/s, v = 6 m/s and s = 1.8 m

It is given that acceleration is constant so we can use,

⇒ v² = u² + 2as

Hence, putting the values, u = 0 m/s, v = 6 m/s and s = 1.8 m,

⇒ (6)² = 0² + 2 a × 1.8

⇒ a = 10 m/s²,

Using v = u + at,

Putting values again, u = 0 m/s, v = 6 m/s and a = 10 m/s²,

⇒ 6 = 0 + 10t

⇒ t = 0.6 s

Time taken during distance 1.8 m in 0.6 seconds,

Now, acceleration changes as, a = -2.5 m/s² and board stops, that is v =0,

⇒ v = u + at,

Putting values, u = 6 m/s, v = 0 m/s and a = -2.5 m/s²

⇒ 0 = 6 - 2.5t,

⇒ t = 2.4 s,

Time taken during to stop after 1.8 m is 2.4 seconds.

Total time taken = 2.4 + 0.6 = 3 seconds.

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