how is a pure substance different from a mixture? A. mixtures can be separated by physical means B. Pure substances are made up of mixtures C. A pure substance is heterogeneous D. A mixture is made of one substance

change in Velocity equals Velocity final - Velocity initial

20-0=20

Answer: a little longer than a yard (about 3 ft)

Explanation:

The ball at the top of the ramp has potential energy but when it rolls down or when it is rolling down it has kinetic. The ball has kinetic energy when it is moving or rolling down the ramp but there is Potential energy when the ball is at the top or is sitting at the bottom still. when the ball is rolling down the ramp it has heat energy because of how it get speed and it starts to heat up.

Answer:

The energy of the ball is transformed from potential energy to kinetic energy when it is released at the top of the ramp. When the ball rolls down the ramp, kinetic energy increases and potential energy decreases. The law of conservation of energy says that energy can not be created or destroyed, it can be tranformed or transferred. The total energy of the ball stayed the same because potential and kinetic energy are inversely related.

Explanation:

Final answer:

The correct order of increasing size from smallest to largest is: electron, proton, nucleus, atom. Electrons are the smallest particles in this list and form the cloud around the nucleus, which is made of larger protons and neutrons. Atoms include both the nucleus and the electron cloud, making them the largest structures listed.

Explanation:

In order to rank the following from smallest to largest in size, we need to understand the structure of an atom. An atom consists of a central nucleus, which contains protons and neutrons, surrounded by a cloud of electrons.

An electron is the smallest particle among the ones listed. It is part of the cloud around the nucleus and has a negative charge. A proton is a positively charged particle that is one of the components of the nucleus and is larger than an electron. The nucleus, which consists of both protons and neutrons, is significantly larger than a single proton. The atom, consisting of the nucleus and electron cloud, is the largest of all listed components.

It is important to note that while protons and neutrons have roughly the same size, the nucleus varies in size depending on the number of protons and neutrons it contains. Electrons, on the other hand, being much smaller, do not contribute significantly to the overall size of the atom.

Speed limits are used on streets and highways instead of velocity limits because speed is a scalar quantity, meaning it only has magnitude and not direction. By imposing speed limits, authorities can regulate the maximum speed at which vehicles can safely travel, regardless of their direction.

Speed limits are used on streets and highways instead of velocity limits because speed is a scalar quantity, meaning it only has magnitude and not direction. Velocity, on the other hand, is a vector quantity that describes both magnitude and direction. By imposing speed limits, authorities can regulate the maximum speed at which vehicles can safely travel, regardless of their direction.

For example, if a street has a speed limit of 40 mph, it means that vehicles must not exceed this magnitude of speed, whether they are traveling east, west, north, or south. This ensures consistent enforcement and promotes safe driving practices for all vehicles.

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Answer:

Gases has the following properties:  

i) Gases are less dense than liquids and solids  

ii) Gases molecules has large space between them so, they can be easily compressed  

iii) Gases has indefinite shape and volume  

iv) Gases can occupy all the space provided  

v) Gases molecules has random motion and collisions

vi) When gases are heated their volume increases  

vii) Gases can diffuse from one place to another due to the difference of concentration of molecules

We have that for the Question "What two controls on a car cause a change in speed? What control causes only a change in velocity" it can be said that

a)

b)

From the question we are told

What two controls on a car cause a change in speed? What control causes only a change in velocity

Generally

A car is been regulated or driven by many controls

But for the speed of a car will consider

The accelerator this is a control that regulate the speed of the vehicle by increasing and decreasing its speed in motion and initiating its motion

This is a control that regulate the speed of the vehicle by decreasing its speed in motion

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The evidence that shows that a chemical reaction has taken place is an alteration in odor a shift in color, a temperature shift, The emission of light or heat, and the formation of gasses or precipitates.

One or more compounds, known as reactants, convert into one or more new ones, known as products, during a chemical reaction. Substances are made up of chemical building blocks or compounds.

Chemical interactions play some sort of role in technology, culture, and even life itself. For thousands of years, people have understood and used chemical reactions in a number of processes, such as burning fuels, smelting iron, making glass and pottery, brewing beer, producing wine, and making cheese.

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Option (b) is correct. The approximate length of the unsharpened pencil is almost  [tex]\boxed{20\text{ cm}}[/tex] or [tex]\boxed{2\times10^{-1}\text{ m}}[/tex].

Explanation:

The measurement of the quantity is the most fundamental requirement for the  estimation of any quantity. The measurement of length of a body is done using the standard unit of measurement which is meter.

The approximate length of an unsharpened pencil is considered to be almost [tex]20\text{ cm}[/tex].

In order to express the length of the pencil in the standard unit of measurement of length, we should know about the conversion factor.

One meter is considered to be equal to the [tex]100\text{ cm}[/tex] of the length. The conversion factor can be expressed mathematically as:

[tex]n=\dfrac{1\text{ m}}{100\text{ cm}}[/tex]

The length of the pencil can be expressed in terms of standard unit as:

[tex]\begin{aligned}l&=20\text{ cm}\left(\dfrac{1\text{ m}}{100\text{ cm}}\right)\\&=2\times10^{-1}\text{ m}\end{aligned}[/tex]

Thus, option (b) is correct. The approximate length of the unsharpened pencil is almost  [tex]\boxed{20\text{ cm}}[/tex] or [tex]\boxed{2\times10^{-1}\text{ m}}[/tex].

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Answer Details:

Grade: Middle School

Subject: Physics

Chapter: Units and Measurements

Keywords:

length, approximate, unsharpended, pencil, standard unit, estimation, 20 cm, 0.2 m, quantity, measurement.

10 m/s to the right is an example of the velocity of an object. Thus, the correct option is B.

Velocity can be defined as the directional speed of an object which is in motion as an indication of the rate of change in the position of an object as observed from a particular frame of reference by the observer and it is measured by a particular standard of time.

Velocity is a vector quantity. This is because, velocity has both the magnitude and direction. The SI unit of velocity is meter per second. The velocity of an object can be calculated by the formula:

Velocity = Displacement/ Time

Therefore, the correct option is B.

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Answer:

calcium fluoride

Explanation:

Answer:

B

Explanation:

Answer:

Rutherford brought the concept of a nucleus. He said that the atom "had a tiny and heavy nucleus."

Objects of the same mass on different planets will have different weights depending on the local gravity. An object will weigh more on Planet A with stronger gravity than on Planet B with weaker gravity, even though the mass is constant.

Two objects with the same mass on different planets will have different weights if the planets have different strengths of gravitational force. On Planet A, where the force of gravity is stronger, an object will weigh more compared to its weight on Planet B, where the force of gravity is weaker. This is because weight is the force exerted by the gravitational field of a planet on an object, which can be calculated using the equation F = ma, where m is the mass and a represents the acceleration due to gravity (g) on that planet. Therefore, if gravity is stronger on Planet A, the acceleration due to gravity is greater, resulting in a greater weight for the object, even though its mass remains unchanged.

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The weights of two objects with the same mass will differ on different planets due to varying gravitational forces. The object on the planet with the stronger gravitational force will weigh more.

The weights of objects depend on both their mass and the gravitational force acting upon them. Since both objects have the same mass but are on different planets with different gravitational forces, their weights will differ.

Specifically, the object on Planet A, which has a stronger force of gravity, will weigh more than the object on Planet B, which has a weaker gravitational force.

Weight is calculated by the equation:

Weight = Mass × Gravitational Force

If the gravitational force on Planet A is stronger, then for the same mass, the weight will be greater. For example, if an object has a mass of 10 kg and Planet A has a gravitational force of 15 N/kg, the weight will be:

Weight = 10 kg × 15 N/kg = 150 N

If the same object is on Planet B with a gravitational force of 10 N/kg, then the weight will be:

Weight = 10 kg × 10 N/kg = 100 N

Thus, even though the mass of the objects is the same, their weights are different due to the different gravitational forces on each planet.

Answer:

A kettles

Explanation:

Light is the major component required by marine organisms. The penetration of the light varies with the depth of the ocean.

The penetration of the light rays decreases with an increase in depth. The light is unable to breach below 1000 to 1200 meters.

The light effect on the ocean can be explained as:

1. The seawater absorbs the red, orange, and yellow wavelengths, which causes the blue light to penetrate farther into the ocean. It gives the ocean its distinctive blue color.

2. The water absorbs the light rays as it penetrates deep into the ocean. The light rays get completely absorbed before it reaches the ground of the ocean.

3. The light cannot penetrate deep within the ocean, thus, the deep lengths of the ocean are still unknown to humans.

Thus, the light penetration decreases with an increase in the depth of the ocean.

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The speed of the wagon increases from 2.5 m/s to 9.0 m/s over a 3 second interval, leading to an acceleration of 2.17 m/s².

This physics question involves the concept of acceleration. The acceleration of the wagon is determined by its change in speed per unit of time. In this case, the speed (or velocity) of the wagon increase from 2.5 meters per second to 9.0 meters per second over a 3.0 second time interval. The difference in speed is 9.0 m/s - 2.5 m/s = 6.5 m/s. Since this speed change happens over 3.0 seconds, the rate of change, or acceleration, is 6.5 m/s divided by 3.0 s which equals 2.17 m/s². Therefore, the magnitude of the acceleration of the wagon during this 3.0 second time interval is 2.17 m/s².

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Answer:

107,550 J

Explanation:

Kinetic energy = 1/2 * mass * velocity^2

In this case, the mass of the object is given as 478 kg and the speed is given as 15 m/s.

Plugging these values into the formula, we get:

Kinetic energy = 1/2 * 478 kg * (15 m/s)^2

Simplifying the equation, we have:

Kinetic energy = 1/2 * 478 kg * 225 m^2/s^2

Multiplying the numbers together, we get:

Kinetic energy = 107,550 kg*m^2/s^2

Simplifying further, we can express the unit of kinetic energy as joules (J):

Kinetic energy = 107,550 J

Answer:

A galaxy because that is the largest group and contains many things.

Explanation: