Identify the number of atoms on the reactant side of the chemical equation.

Fe2O3 + 3H2 → 2Fe + 3H2O

There are blank Fe (iron) atoms.

There are blank O (oxygen) atoms.

There are blank H (hydrogen) atoms.

The child's resultant velocity is 21.3 m/s.

The resultant velocity of the child can be determined by subtracting the child's velocity from the velocity of the bus. In this case, the child is walking towards the back of the bus, so their velocity is negative. Therefore, the resultant velocity of the child is:

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Answer:

C.) Nuclear

Explanation:

Answer:

it's C

Explanation:

A peer-reviewed article about the effectiveness of the motor oil is most likely to provide the most reliable scientific information about a new kind of motor oil. So, option D.

Motor oil is a lubricant used in the moving parts of a engines, vehicles and other machines.

Engines have moving parts that rub against one another, wasting heat instead of kinetic energy that would otherwise be beneficial. Furthermore, it degrades those components, which can cause the engine to run less efficiently and become less reliable.

In addition to extending the life of engines, proper lubrication reduces fuel use and wasted power.

In order to prevent direct contact between surfaces of adjacent moving parts, lubricating oil forms a separating layer between them. This minimizes frictional heat generation and wear, safeguarding the engine. When in use, motor oil conducts heat as it moves through the engine. This heat is transported through airflow over the external surface of the oil pan, airflow through an oil cooler, and through oil gases expelled by the positive crankcase ventilation (PCV) system in an engine with a recirculating oil pump.

Peer-reviewed journals and books are regarded as the most dependable sources and are frequently a great resource for finding reliable and scientific content.

Hence,

A peer-reviewed article about the effectiveness of the motor oil is most likely to provide the most reliable scientific information about a new kind of motor oil.

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The object discovered in the solar system that has been most likely to be a planet has been object A.

A planet is an object present in the solar system with the ability to revolve around a star. It has been considered a celestial body, with the presence of a specified force of gravity.

As Kepler's laws of planetary motion suggest that the orbits are elliptical with the sun at a focus. So it is not necessary that the orbit is circular or the shape is circular. Also, it is necessary that the orbit is around the sun.

Of the objects discovered in the solar system, object A has been revolving around the sun that starts with the circular orbit and has been found to be present in Kepler's belt as well. Thus, object A has been most likely to be a planet.

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Answer:

Plasma membrane

Explanation:

A scientist is studying an organelle that is controlling the amount and types of substances that are moving in and out of a cell. She is observing the cell membrane.

The cell membrane, also known as the plasma membrane, is found in all cells and serves to isolate the cell's interior from its exterior environment.

The cell membrane is made up of a semipermeable lipid bilayer. The cell membrane handles the transmission of materials into and out of the cell.

The cell membrane, also known as the plasma membrane, is the outer covering of a living cell that completely covers the cytoplasm as well as nucleus.

Glycerophospholipids, molecules constituted of glycerol, a phosphate group, or rather two fatty acid chains, make up cellular membranes, including plasma membranes and internal membranes.

Glycerol is a three-carbon molecule that serves as the membrane lipids' backbone.

Thus, the scientist is observing the plasma membrane as it aids in the transport of material in and out of the cell.

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Answer:

8750 m

Explanation:

S= v x t

S= 350 x 25

S= 8750 m

The elephant's friend is 8750 meters away.

The subject of this question is Physics, specifically related to sound waves and their travel. The question involves an elephant communicating with infrasound at 16 Hz and determining the distance between it and the receiver of the sound by using the speed of sound in air. To answer how far away her friend is, you would use the equation of distance traveled by the wave, which is the product of the wave's speed and the time it took to reach the receiver.

Distance = Speed of Sound × Time
Distance = 350 m/s × 25 s
Distance = 8750 m

Answer:

A) Light waves are restricted to a single plane through the lens.

Explanation:

Took the quiz and got it right

Final answer:

The view inside a lens differs from the outside because light waves refract in multiple directions within the lens, a process essential for lenses to form images by bending light.

Explanation:

The view within the rectangle lens is different than the view outside the lens because light waves refract in multiple directions through the lens. When light waves enter the lens, they experience refraction both when they enter and exit the lens medium. The concept of refraction is inherently three-dimensional and is based on the principle that when light passes through variations in matter, its direction changes due to the different speeds at which light travels in different media. This bending of light is essential for lenses to redirect light and form images, whether they are magnified, shrunk, or inverted.

Lenses like the eye's crystalline lens or a microscope's glass lens use refraction to form images by bending light towards or away from the line perpendicular to the boundary surface. The thin lens approximation simplifies this process by considering the double refraction through the lens as a single change in path occurring at the plane of the lens. An example of this principle in action would be rays of light entering a diverging lens and appearing to originate from its focal point due to their diverging paths.

Answer:

The answer is A i think :)

Answer:

Explanation:

Based on the wave model of light, physicists predicted that increasing light amplitude would increase the kinetic energy of emitted photoelectrons, while increasing the frequency would increase measured current.

Contrary to the predictions, experiments showed that increasing the light frequency increased the kinetic energy of the photoelectrons, and increasing the light amplitude increased the current.

Based on these findings, Einstein proposed that light behaved like a stream of particles called photons with an energy of \text{E}=h\nuE=hνstart text, E, end text, equals, h, \nu.

The work function, \PhiΦ\Phi, is the minimum amount of energy required to induce photoemission of electrons from a metal surface, and the value of \PhiΦ\Phi depends on the metal.

The energy of the incident photon must be equal to the sum of the metal's work function and the photoelectron kinetic energy:

The answer is: B.

speeds above 343 m/s.

:)

Supersonic speeds is speed which is above 343. Hence option B is correct.

Speed is a rate of change of distance with respect to time. i.e. v=dx÷dt. Speed can also be defined as distance over time i.e. speed= distance ÷ time. It is denoted by v and its SI unit is m/s. it is a scalar quantity. Speed shows how much distance can be traveled in unit time.

To find dimension for speed is,

from formula Speed = Distance ÷ Time

Dimension for distance is [L¹] ,

Dimension for Time is [T¹],

Dividing dimension of distance by dimension of time gives,

[L¹] ÷ [T¹] = [L¹T⁻¹]

Dimension for speed is [L¹T⁻¹].

Supersonic speed is the speed of an object that is above the speed of sound. For objects traveling in dry air of a temperature of 20 °C. Speed of the sound is 343 m/s in dry air.

Hence Option B is correct.

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Answer:

dropping a marble from the roof

Explanation:

this represents gravitational force which is infact a non-contact force

Answer:

Shorter and higher

Explanation:

I did this lesson and i got it right :D hope it helps

Compared to visible light, the wavelength of X-rays is smaller and the frequency is  greater.

The electromagnetic spectrum consists of waves arranged based on the increasing frequency of the waves or decreasing wavelength of the waves.

Electromagnetic spectrum based on decreasing frequency and increasing wavelength;

Thus, compared to visible light, the wavelength of X-rays is smaller and the frequency is  greater.

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Answer:

1.27 s

Explanation:

throwing keys are dangerous

1 electron's charge = -1.602 x 10⁻¹⁹ Coulomb

890 electron charges = (890)·(-1.602 x 10⁻¹⁹ C) = -1.426 x 10⁻¹⁶ C

Answer:

The crests of the sound wave are spaced closer together.

Explanation:

the wavelength between successive crests is decreased due to the motion of the truck in the same direction as the sound

Answer and Explanation: The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. As the source of sound waves approaches a listener, the sound waves get closer together, increasing their frequency and the pitch of the sound.

Hopefully that helped!

Answer:

C. A spring is stretched.

Explanation:

Kinetic energy is the energy of motion, potential energy is stored energy. The motion of stretching the spring is kinetic, the energy it has before it's released is potential.

When a spring is stretched, it stores potential energy.

The correct answer is C. A spring is stretched. This is an example of kinetic energy being converted to potential energy because when a spring is stretched, it stores potential energy. Kinetic energy refers to the energy of an object due to its motion, while potential energy is the energy that an object possesses due to its position or state.

In this example, when a spring is compressed or stretched, work is done to change its shape. As a result, potential energy is stored in the spring. When the spring is released, the potential energy is converted back into kinetic energy as the spring returns to its original shape and moves.

This conversion between kinetic energy and potential energy is a fundamental concept in physics and can be observed in various everyday examples such as stretched springs, raised objects, or compressed gas.

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It can be used to clean small items like jewelry

It can be used to clean large items like machinery

Statements 2 and 3 accurately describe the uses of ultrasound technology.

It is a widely used technology in all fields.

Diagnostic ultrasonography, commonly known as sonography is an imaging technique that produces pictures of inside body structures using high-frequency sound waves.

The pictures can aid in the diagnosis and treatment of a wide range of illnesses and ailments.

The ultrasound wave helps in the following applications;

1. It can be used to clean small items like jewelry.

2. It can be used to clean large items like machinery.

Hence statements 2 and 3 accurately describe the uses of ultrasound technology.

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The interstellar matter within the Milky Way galaxy primarily contributes to the formation of new stars, not new galaxies, new universes, or new constellations. Constellations are not formed but are simply patterns or configurations of stars as observed from the Earth.

The Milky Way galaxy, which is the galaxy that contains our solar system, is composed of various forms of interstellar matter that include stars, dust, and gas. This interstellar matter has the potential to contribute to the formation of new celestial bodies. Forming new galaxies or new universes as suggested in the question, however, is not typically attributed to the interstellar matter within the Milky Way itself.

Instead, the interstellar matter in the Milky Way is primarily involved in forming new stars. This occurs when dense regions of dust and gas collapse under their own gravitational pull, thus initiating nuclear fusion and creating a new star.

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Answer:

r = 29.53 degrees

Explanation:

Given that,

Angle of incidence, [tex]i=41^{\circ}[/tex]

We need to find the angle at which it will travel in the water. The refractive index of water is 1.33 and refractive index of air is 1. Using Snell's law as :

[tex]n_1\sin i=n_2\sin r[/tex]

r is the angle of refraction

[tex]\sin r=\dfrac{n_1}{n_2}\sin i\\\\\sin r=\dfrac{1}{1.33}\times \sin (41) \\\\r=\sin^{-1}(0.493)\\\\r=29.53^{\circ}[/tex]

So, the ray will travel at an angle of 29.53 degrees in the water.

Answer:

29.53

Explanation:

right on acellus

9 V Battery has the least current than 1.5 V AA Battery.

Explanation:

A standard 9 V battery has about 400-600 mAh capacity. In the most basic terms, these batteries can supply about 500 milliamps for one hour before being "dead".

Normal AA/AAA batteries that have a voltage rating of 1.5 V can supply constant 50 mA current for a total capacity of 1800-2600 mAh.

Therefore 9 V Battery which have current around 400-600 mAh capacity has the least current than 1.5 V AA Battery which have 1800-2600 mAh capacity.

Final answer:

Pictures of valleys on a planet's surface can indicate the presence of water, a critical natural resource, whereas other features like craters or rocks might suggest different geological aspects but not specific resources.

Explanation:

When considering pictures of a planet's surface to provide evidence about the planet's natural resources, there are specific indicators to look for. For instance, valleys often signify past or present water flow, as they are typically formed by this process. Figure 10.30 from Gale Crater and Underground Ice Deposits demonstrates this, showing cross-bedded sandstone, which geologists interpret as evidence of liquid water activity. Therefore, valleys on a planet's surface can indicate the presence of water, which is a crucial natural resource. Other features, such as craters or rocks, may suggest geological activity, age, or the presence of minerals, but not necessarily specific resources like gold or natural gas without additional data.

Answer:

The fundamental law of magnetism states that like poles repel and unlike poles attracts each other

North and South = attraction

South and North = attraction

Explanation:

What are magnetic poles?

The magnetic poles are the two points at The end of a magnetic bar in which the magnetic properties are most pronounced.

When two opposite magnetic poles are close, they attract each other. When like poles are pushed together, there is a force of repulsion. The rule for magnets is that like poles repel and unlike poles attract.

Answer:

C.) Set C

( It says unlike poles)

Answer:

The gas enclosed in a container with rigid walls is at a pressure of 150,000 Pa. The temperature of the gas is 27 ° C. At what temperature in Kelvin and degrees Celcius does the gas have to be heated so that the pressure is 300,000 Pa?

Explanation:

Given that,

When the temperature is 27°C, it's pressure is 150,000 Pa

Then,

T₁ = 27°C

Let convert to Melvin

T₁ = 27 + 273 = 300K

P₁ = 150,000 Pa

What's the temperature when it is heated to a pressure of 300,000 Pa

T₂ =?

P₂ = 300,000 Pa

Since the gas is in a rigid wall container then the volume does not change so,

V₁ = V₂

Using Gay Lussac law,

P₁ / T₁ = P₂ / T₂

Making T₂ subject of formula

T₂ = P₂ × T₁ / P₁

T₂ = 300,000 × 300 / 150,000

T₂ = 600K

So, converting to °C

°C = K - 273

°C = 600 - 273

°C = 327 °C

Then, the final temperature at 300,000 Pa is 600K OR 327°C

So, using Spanish

Dado que,

Cuando la temperatura es de 27 ° C, su presión es de 150,000 Pa

Entonces,

T₁ = 27 ° C

Deje convertir a Melvin

T₁ = 27 + 273 = 300K

P₁ = 150,000 Pa

¿Cuál es la temperatura cuando se calienta a una presión de 300,000 Pa?

T₂ =?

P₂ = 300,000 Pa

Como el gas está en un contenedor de pared rígido, el volumen no cambia,

V₁ = V₂

Usando la ley Gay Lussac,

P₁ / T₁ = P₂ / T₂

Hacer T₂ sujeto de fórmula

T₂ = P₂ × T₁ / P₁

T₂ = 300,000 × 300 / 150,000

T₂ = 600K

Entonces, convirtiendo a ° C

° C = K - 273

° C = 600 - 273

° C = 327 ° C

Entonces, la temperatura final a 300,000 Pa es 600K o 327 ° C

Answer:

Answer would be 0.33

Explanation:

Calculations

Answer:

The answer is 0.33

Explanation:

because if (v2-v1)/(t2-t1)

then if you fill it in then you could definetly get the answer.

Answer:

The revolution of the earth around the sun and the tilt of the earth's axis cause the changing of the seasons.

Explanation:

The Earth's rotation causes day and night, while its revolution causes seasons. This happens due to how the rotation exposes different parts of the Earth to the sun, and how the tilt of the Earth's axis during revolution causes varying sunlight exposure.

The rotation of Earth on its axis causes day and night. This astronomical phenomenon happens because as the Earth rotates, different parts of it are exposed to the Sun's light, creating the cycle of day and night. On the other hand, the revolution of the Earth around the sun causes the seasons. As the Earth orbits the Sun, the tilt of our planet's axis causes different parts of the Earth to receive varying degrees of sunlight throughout the year, which results in the changes in weather conditions we know as seasons.

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Thermoelectric generator is the method by which an electrical potential developed in generators and thermocouple.

Explanation:

Answer:

Electric generators develop an electric potential via magnetic induction. Moving a conducting rod through a magnetic field that exists between the poles of a horseshoe magnet causes an electric potential to be set up in the rod. Free electrons move through this rod from one end to the other for as long as movement of the rod is maintained. The direction of this movement depends on whether the rod is moved across the lines of force in the magnetic field in either the opposite direction or the same direction. Generators usually consist of multiple conductors mounted on a cylinder that rotates in a magnetic field.

Thermocouples utilize heat to develop an electric potential. Two strips of different metals are connected at one end to form a junction and the other ends are kept apart. A heat source is applied to the junction; this causes each metal strip’s temperature to rise at the junction. The free ends aren’t as hot and electric charges are produced at these free ends. Because the strips consist of different materials, there's a difference of potential between these free ends; when connected by a conducting wire, the electrons can move through the pathway. The voltage that's produced will become greater as the difference in temperature between the free ends and the junction increases.

Answer:

a)    v₂ = 8,112 m / s , b)   P₂ = 206.8 10³ Pa

Explanation:

This is a fluid mechanics exercise, let's use index 1 for thick pipe and index 2 for thinner pipe

a) with the continuity equation it allows to find the speed of the water  

          v₁ A₁ = v₂ A₂

the area of ​​a circle is

          A₁ = π r₁² = π d₁² / 4

         v₂ = v₁ d₁² / d₂²

let's calculate

         v₂ = 1.2 3.90² / 1.50²

         v₂ = 8,112 m / s

b) We use Bernoulli's equation

         P₁ + ½ ρ v₁² + ρ g y₁ = P₂ + ½ ρ v₂² + ρ g y₂

          P2 = P1 + ½ ρ (v₁² - v₂²) +ρ g (y₁ -y₂)

let's calculate

         P₂ = 190 10³ + ½ 1000 (1.2² - 8.112²) + 1000 9.8 5

         P₂ = 206.8 10³ Pa

Answer:

its like game controlls the 1st doesnt move  R  L R R R R it matters on the arrows pay attention to the directions take the arrows away then put them back to see what u get 1 at a time its newtons third law

Explanation: