Energy is an essential part of our daily lives, but the resources that power the earth are being threatened. Imagine a world where people didn't know how to generate energy. What do you think that world might be like? describe your answer in 4-6 sentences.

The distance will be 20km.

Like any other equation, the formula speed = distance time can be changed.

There are three possible arrangements for the formula:

Distance is determined by speed and time.

Time = Speed x Distance

Speed given = 8km/Hr

Time = 2.5 hours

Distance = Speed * Time

              = 8 * 2.5

              = 20 km

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Answer:

12.4274 miles or 20 kilometers

Explanation:

[tex]distance = time[/tex] × [tex]speed[/tex]

distance = 2.5hr × 8 kph

2.5 × 8 = 20   Note: this is if we solve with kilometers.

Let's solve with miles now.

Let's convert kph to mph.

Let's solve for mph, in this case, mph will be x, and y will be kph.

x = y ÷ 1.609344

x = 8 kph ÷ 1.609344

8 kph ÷ 1.609344 = 4.97097 mph

x = 4.97097 mph

Now, x will be distance. y will be time and z will be speed.

Let's solve for x:

x = y × z

y = 2.5

z = 4.97097

x = 2.5 × 4.97097

4.97097 × 2.5 = 12.4274

x = mph

x = 12.4274

x = 12.4274 mph

miles = hours × mph

12.4274 = 2.5 × 4.97097 = x
x = mph

x = 12.4274

x = 12.4274 mph

Hence, the right answer is 12.4274 miles or 20 kilometers.

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Correct me if I'm wrong :(

Happy to help!

The width of the slit would be approximately 690 nm. The width of a slit refers to the size of the opening in the barrier that is used to produce the slit.

The width of a single slit that produces its first minimum at 60 degrees for 600-nm light can be calculated using the formula for the width of a single slit, which is:

w = λ / (sin θ)

where w is the width of the slit, λ is the wavelength of the light, and θ is the angle at which the first minimum occurs. Plugging in the values for λ and θ, we get:

w = 600 nm / (sin 60°)

= 600 nm / (0.866)

= 690 nm

So the width of the slit would be approximately 690 nm.

It's important to note that this is just an approximate value, as the exact width of the slit will depend on the precise conditions of the experiment, such as the distance between the slit and the screen, the size and shape of the slit, and other factors.

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A diamond bends light as it passes through it. The refraction is 2.4 if the incidence angles is 30° and the incident ray is 12°.

When light waves cross the border between two materials with different densities, like air and glass, their speed changes. They alter direction as a result, which is referred as as refraction.

That speed with which light will alter as it passes via one media and then enters another. Refraction results as a result of this. The direction of light passage from air into water is altered as a consequence of the shift in medium.

Snell's law states:

n₁sinθ₁ = n₂sinθ₂

n₂ = sinθ₁/ sinθ₂

n₂ = sin(30)/sin(12)

n₂ = 2.4

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The speed of water in the constriction is faster when compared to the rest of the pipe.

The venturi effect consists of a physical phenomenon applied in fluid dynamics in which the pressure of flow decreases when there is a constraint in the conduct, accompanied by an increase in velocity of the fluid due to a decrease in cross-sectional area of the conduct.

The constriction is said to have a lower radius when compared to the rest of the pipe.

Applying the equation of continuity, A₁ v₁ = A₂ v₂

where, A is the area

v is the velocity

It is said from the above equation that, if area decreases velocity increases and if area increases velocity decreases, as velocity and area are inversely proportional to each other.

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Answer: 1,250 joules

Explanation: elastic potential energy is half of the spring constant multipied by extention squared so its 12.5 multiplied by 100 which is 1,250

The length of a pendulum whose period on the moon matches the period of a 2.8 m long pendulum on the earth is 0.462 m.

The time taken for completing one cycle of oscillation is called the period of a pendulum. The factors affecting the period of a pendulum are the length of the pendulum and the gravity of the surface of the heavenly body. It never depends on the mass of the pendulum.

The period of a pendulum is given by the formula.

[tex]T=2\pi \sqrt{l/g[/tex]

Where

T= Time period

l= length of a pendulum

g= acceleration due to gravity of surface.

For the 2.8 m long pendulum on the earth,

[tex]T=2\pi \sqrt{2.8/9.8[/tex]

For the pendulum of length l on moon,

[tex]T=2\pi \sqrt{l/1.62[/tex]

The value of surface gravity g on moon is 1.62 [tex]m/s^{2}[/tex].

According to the question,

[tex]2\pi \sqrt{2.8/9.8[/tex]=[tex]2\pi \sqrt{l/1.62[/tex]

So, l=2.8/9.8×1.62

     l= 0.462 m

So, the length of such pendulum is 0.462 m.

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Answer:

The speed of the bodies will be 2.27 m/s

Explanation:

The picture bellow is the solution of the task, but I will give additional clarification here in case that the steps are not clear enough.

First, we want to calculate the acceleration of the whole system. To do that, we'll need to divide the net force (total force) by total mass. In my diagram, I've drawn all the forces which act on the body, but only those forces which I've circled in blue are relevant since all the other forces cancel each other out. The relevant forces are: force due to gravitational acceleration (g) on m2, component of the force due to g acting in the direction parallel to the plane, and the force of friction which always opposes the motion (aka acts in the opposite direction from the direction in which the body is moving; in this case down the plane). Since m2 pulls m1  up the plane, that will be our positive direction, so m2*g will be positive and other two forces will be negative. Putting all the data into the formula, we get the acceleration a ≈ 4.36 m/s².

Next step is calculating the time m2 takes to reach the ground. We use formula: [tex]s=ut+\frac{1}{2} at^{2}[/tex]  ut will be 0 since the system was initially at rest. When we rearange the formula and put in the values we get that the time t ≈ 0.52 s.

Finally, we get the velocity by multiplying time taken to reach the ground by the acceleration of the system.

The 2023 regenerative braking system recovers kinetic energy from the drive wheels and converts it into electrical energy to recharge the battery when the driver applies the brakes and the vehicle is coasting.

A regenerative braking system is an energy recovery device aimed at maximizing the range while slowing the velocity of the vehicle via the transformation of the kinetic energy into another type of energy.

Therefore, with this data, we can see that a regenerative braking system is aimed at slowing the velocity by converting kinetic energy.

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As shoes are worn down, there is a decrease in the coefficient of friction, that increases the risk of injury from a slip and fall for the one wearing it

Wearing off shoes decreases the coefficient of friction that increases the risk of slip.

Rubber-soled shoes on a concrete surface can generate a coefficient of friction over 1.0µ. Generally, a coefficient of friction of 0.4µ to 0.5µ is considered a good traction offering.

One of the easiest and do-it-yourself ways to make shoes slip-resistant is to scuff the soles with sandpaper, a nail file, or with any rough surface, such as brick, gravel or rock. You have to simply rub the rough item on the sole of your shoe until small grooves appear.

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It is a 2:1 ratio of ey, final, the maximum value of the y-component of the electric field immediately following the last polarizer, to eo, the amplitude of the electric field oscillations in the incident polarized beam.

What is a ratio?

A ratio is the divisional comparison of two numbers.

We may find the ratio by dividing the second output by the first output, which corresponds to the first two outputs, or -1/8 and -1/4:

-1/4-1/8

We multiply by the reciprocal when dividing fractions:

-1/4x-8/1

When multiplying fractions, multiply across the board:

(-1x-8)/(4x1) 8/4=2

A ratio is a comparison of two or more numbers in mathematics that shows how big one is in comparison to the other. A ratio divides two amounts into equal parts, with the dividend or antecedent serving as the unit of comparison and the divisor or unit of comparison serving as the unit of comparison.

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The observed frequency will be greater than the source’s frequency (option - A) is correct answer.

If the source and observer are moving simultaneously in either case—moving observer or moving source—you'll notice that the frequency increases. The frequency decreases if they are drifting apart. Whether the source is moving or the observer is moving will affect how much the frequency changes.

Although the waves move at the same speed, the frequency that is observed is affected by any relative movement between the source and the observer. The wavelength changes along with the observed frequency. When an observer and a source are moving in the same direction, the frequency rises and the wavelength falls.

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Answer:

please help

Explanation:

Each compound name with chemical formula:

Silicon tetrafluoride - SiF₄

Potassium sulfite - K₂SO₃

Diphosphorous trisulfide - P₂S₃

Siver(II) fluoride - AgF₂

Magnesium perchlorate - Mg(ClO₄)₂

A compound's constituent elements and their relative proportions are listed in a chemical formula. No subscript is used when there is only one atom of a particular type. A subscript is added to the symbol for the atom when there are two or more of a particular type of atom present.

A chemical formula lists the constituent elements of a compound along with how many atoms of each are present in the compound's smallest unit, whether it be a molecule or a formula unit. We can name simple compounds given their chemical formulas by using the names of the elements and a few simple rules.

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Answer:

C

Explanation:

There are '3'   CO3' S      3 x 3 = 9  oXYGEN ATOMS

The total number of oxygen atoms indicated by the formula Fe₂(CO₃)₃ is 9. Hence, option (c) is correct.

A chemical formula is a way to describe the chemical ratios of the atoms that make up a specific chemical compound or molecule in chemistry. Chemical element symbols, numbers, and occasionally other symbols, such as parentheses, dashes, brackets, commas, and plus (+) and minus (-) signs, are used to represent the chemical elements.

These can only include one typographic line of symbols, which may also include subscripts and superscripts. A chemical formula has no words and is not the same as the chemical name.

Given  chemical formula is:  Fe₂(CO₃)₃.

The total number of oxygen atoms in the formula = 3×3 = 9.

Hence option (c) is correct.

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The studies of bursting white dwarfs are used to calculate the galactic distances that are used to quantify the expansion of the universe.

The ability to accelerate shows how rapidly an athlete can change their velocity after setting off at rest over a particular amount of time and over a certain distance. It is an essential ability for sprinting as well as other ball games.

An object's motion is altered by a net force; the larger this net force, the more acceleration there is. To speed at the same speed as less massive objects, higher net forces are needed.

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The complete question is-

The galactic distances used to measure the acceleration of the universe are determined by observations of

a) trigonometric parallax

b) line broadening

c) Cepheid variable stars

d) exploding white dwarfs

Answer: 0.488  m

Explanation: I have my ways ;>

When the balance of the forces acting on the object you are acting on results in no changes in motion. Unbalanced forces have an influence on the item that are acting on and do not cancel one another out.

Two things cause this. An object will move if an imbalanced pressure pushes or pulls on it while it is at rest. Forces acting can also cause an item in motion to shift its speed or direction.

Because of unequal power or strength delivered to one side of an item, an imbalanced force results in a shift in motion, pace, direction, or movements. There are forces working against the other side.

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Answer:

4.5s

Explanation:

The time taken by thunderstorm = distance traveled /speed of the sound

                                                     =1485 meters /330 meters/seconds

                                                     =4.5 seconds

Thus, it would take 4.5 seconds

Hope it helps!

The velocity of the object would be 100m/s.

The pace is the directional velocity of an object in movement as an indication of its price of the trade-in role as determined from a specific body of reference and as measured through a selected fashionable of the time.

Speed defines the path of the movement of the body or the object. speed is mainly a scalar quantity. speed is basically a vector amount. it is the rate of alternate distance. it's miles the charge of trade of displacement.

The consistent pace is the rate at which an object travels equal displacements in equal instances. Variable pace it's far the velocity at which an object cuts one-of-a-kind displacements at different instances.

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Answer:

Thermal Expansion and Contraction. THERMAL EXPANSION AND CONTRACTION. Materials expand or contract when subjected to changes in temperature

Explanation:

Answer:

Some of the differences between a gravitational force and a magnetic force are:

Overall, gravitational force and magnetic force are two different types of forces that have different properties and behave differently in different situations.

The evidence that  would be used to support the claim that the squirrels are two separate species is that when placed together in pairs for study, no pair of Abert's squirrel and Kaibab squirrel result in offspring which is therefore denoted as option D.

This is referred to as a group of organisms that can reproduce with one another in nature and produce fertile offspring.

In this scenario we were told that Abert's squirrel and Kaibab squirrel may be separate species and the evidence which will support that is that no pair of Abert's squirrel and Kaibab squirrel result in offspring.

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There are several reasons why the actual force of friction for an object at rest may be less than the calculated force of friction. One possible reason is that the object may be on a surface that is not completely smooth, and the roughness of the surface may reduce the amount of friction between the object and the surface. Another reason is that the object may be moving slightly even when it is at rest due to factors such as air currents or vibrations, which can also reduce the amount of friction. Finally, the force of friction is also affected by the materials that the object and the surface are made of and the temperature and humidity of the environment. All of these factors can affect the actual amount of friction that is present and may cause it to be less than the calculated force of friction.

Quantum tunneling can be described as a quantum mechanical process where wavefunctions can penetrate through a potential barrier.

The transmission via the potential barrier can be finite and also depend upon the barrier width as well as barrier height. The wave functions have the probability of disappearing on one side and reappear on the remaining side.

The 1st derivative of the wave functions is generally continuous. In the steady state, the probability flux is spatially uniform and no wave or particle is eliminated. Tunneling can occur with barriers of thickness about 1 to 3 nm and smaller.

Quantum tunneling plays a crucial role in phenomena such as nuclear fusion and α-radioactive decay of atomic nuclei. Quantum tunneling has applications in the tunnel diode, in scanning tunneling microscope, and in quantum computing.

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Quantum tunneling is a phenomenon in quantum mechanics where wavefunctions can pass through a potential barrier. It is a process that defies classical physics, where particles would be expected to bounce back when they encounter a barrier.

In quantum mechanics, particles are described by wavefunctions, which are mathematical representations of their quantum states. These wavefunctions can extend into regions that are classically forbidden, such as inside a potential barrier.

The probability of a particle "tunneling" through the barrier depends on various factors, including the width and height of the barrier. The wavefunctions have a certain probability of disappearing on one side of the barrier and reappearing on the other side.

One important characteristic of quantum tunneling is that the first derivative of the wavefunctions is generally continuous. This means that there is a smooth transition between the regions before and after the barrier. In the steady state, the probability flux is spatially uniform, meaning that no waves or particles are lost during the tunneling process.

Quantum tunneling has significant implications in various areas of physics. It plays a crucial role in phenomena such as nuclear fusion and alpha-radioactive decay of atomic nuclei. It also has practical applications, such as in tunnel diodes, scanning tunneling microscopes, and quantum computing.

Quantum tunneling is a fascinating phenomenon in quantum mechanics where particles can pass through potential barriers that classical physics would consider impossible to overcome.

In classical physics, particles are confined to their energy levels and cannot pass through energy barriers unless they have enough energy to overcome them. However, in quantum mechanics, particles can exhibit wave-like behavior and their wavefunctions can extend beyond the physical boundaries we would expect them to be confined to.

When a particle encounters a potential barrier, there is a probability that its wavefunction can penetrate through the barrier and appear on the other side. This means that even if the particle does not have enough energy to overcome the barrier classically, there is still a chance that it can "tunnel" through the barrier and continue its motion on the other side.

The probability of tunneling depends on factors such as the width and height of the potential barrier. In some cases, the wavefunction can completely disappear on one side of the barrier and reappear on the other side.

Quantum tunneling is not limited to any specific system but can occur in a wide range of phenomena. It has been observed in nuclear fusion, where particles overcome the Coulomb repulsion barrier and fuse together. It also plays a role in the alpha decay of atomic nuclei. Additionally, quantum tunneling has practical applications in devices like tunnel diodes, which exploit this phenomenon to create unique electrical behavior.

Overall, quantum tunneling is a fundamental concept in quantum mechanics that allows particles to defy classical limitations and pass through barriers that would be impossible to overcome classically.

If the distance separating Objects 1 and 2 is doubled, then the new gravitational force will be 72.0 units.

The force of attraction that operates on all matter is known as gravity, or gravitational force in mechanics. It is by far the weakest known force in nature and plays no role in determining the internal properties of everyday matter. It controls the orbits of objects in places, the structure, and the evolution of stars, galaxies, and the universe as a whole.

On Earth, every object has a weight, or downward gravitational force, proportional to its mass, and the mass of the Earth acts on them. The acceleration that gravity causes in a falling item serves as a gauge of its strength. The acceleration of gravity at the Earth's surface is around 9.8 meters per second (32 feet) per second. For each second her body is in free fall, its velocity increases by about 9.8 meters per second. On the moon, the acceleration of a free-falling object is approximately 1.6 meters per second.

The gravitational force among two objects can be written as:

F = G×m₁×m₂/r²

Where G is the gravitational constant, m₁ and m₂ are the masses of both objects and r is the distance between them.

Now, we have that F = 18 .0 units.

Let's change r to 2r, the new force is:

F' = G×m₁×m₂/(2r)²

F' = G×m₁×m₂/4r²

F'/F = (G×m₁×m₂/4r²)/G×m₁×m₂/r²

F' = 4 F

F' = 4 × 18.0

F' = 72 units

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Answer:

450%

Explanation:

The plant species that were resistant to the disease lived and reproduced. Therefore, option (D) is correct.

Plant pathology can be described as the scientific study of diseases in plants caused by pathogens and environmental conditions. Organisms that cause infectious diseases such as fungi, oomycetes, bacteria, viruses, viroids, phytoplasmas, protozoa, nematodes, and parasitic plants.

Plant pathology involves the study of pathogen identification, disease cycles, disease etiology, economic impact, plant disease epidemiology, plant disease resistance, how plant diseases influence humans and animals, genetics, and management of plant diseases.

Over time plants become more resistant to diseases. Therefore, fewer plants die from the disease each year.

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Your question is incomplete, most probably the complete question was,

A plant disease infected a field of wild blackberries. In the first year, many of the plants died from the disease. The next year fewer plants died. In the third year, almost none of the plants died of the disease.

Why did fewer plants die from the disease each year?

A. Over time, the species became less resistant to the disease.

B. All of the plants in the species were resistant to the disease.

C. None of the plants in the species were resistant to the disease.

D. Plants that were resistant to the disease lived and reproduced.

Answer:

-Making the surfaces rough.

-By pressing the surfaces harder against each other (by increasing normal force).

-By removing the lubrication between the surfaces in contact.

-By using sliding motion rather than rolling motion.

-By increasing the surface area in contact.

Explanation:

The force acting on the 3.0 kg object is moving in a circular path with a speed of 4.5 meters per second is 243N.

Centripetal force is the force on a rotating or orbiting body in the direction of the centre of rotation.

The centripetal force acting on an object can be calculated by using the following formula:

F = mv²/r

Where;

According to this question, a 3.0 kg object is moving in a circular path with a speed of 4.5 meters per second. If the radius of the circle is 0.25 meters, the centripetal force is calculated as follows:

F = 3.0kg × 4.5²/0.25

F = 60.75/0.25

F = 243N

Therefore, 243N is the force acting on the object.

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Protostar, main-sequence star, red giant, planetary nebula, white dwarf.   When a white dwarf takes gas from a star nearby, a nova is the result. A star that contains too much mass explodes and forms a supernova.

A star needs to be between eight and fifteen solar masses (opens in new tab) in mass in order for it to explode as a Type II supernova. It will eventually run out of fuel at its core, first hydrogen and then helium, just like the sun. The pressure and mass will be sufficient to fuse carbon, though.

Betelgeuse and Antares are the closest stars that are most likely to go supernova in the next few million years. Both are much farther away—more than 400 light years—than the 30 light-year threshold at which the explosion might become dangerous. Eta Carinae, an extremely large star that can be seen in the southern hemisphere, may die even sooner.

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