what are the two criteria necessary for a substance to be considered a magnet
Answer:The substance;
- must possess poles (north and south)
- exhibit force of attraction and repulsion i.e obeys law of magnetism)
Explanation:
For a substance to be considered a magnet, such magnet must be able to attract metallic objects to itself when placed in a magnetic field.
The substance must possesses free north and south poles at its ends because magnets generally possesses both the force of attraction and repulsion which is dependent on the nature of the poles of the magnetic substances coming together. Like poles of magnets (same poles) are known to repel each other while unlike poles (different poles) of magnets attracts each other
A substance is considered a magnet if it can generate a magnetic field and has both north and south poles. Magnetic fields are created by the movement of electric charges or inherent magnetic properties. In ferromagnetic substances, magnetic domains align in a manner that produces a large-scale magnetic field.
Explanation:To be considered a magnet, a substance must satisfy two essential criteria. Firstly, it needs to generate a magnetic field, which is an invisible force field that exerts a force on other ferromagnetic materials and moving electric charges. The magnetic field is produced either by the movement of electric charges or by intrinsic magnetic properties of the substance itself.
Secondly, a magnet must have both north and south poles. This is a fundamental property of all magnets: if you were to cut a bar magnet in half, you would end up with two smaller magnets, each with its own north and south pole. The two poles represent the directionality of the magnetic field - it emanates from the north pole and loops back into the south pole.
Common types of magnets, such as ferromagnets, achieve these properties through their structure at an atomic level. In ferromagnetic materials, small regions known as magnetic domains are created where atoms are grouped together with their magnetic dipoles aligned in the same direction, producing a noticeable large-scale magnetic field.
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Eleonora is learning about the nervous system in school. She learns the nervous system is made up of many parts. What is the main purpose of the nervous system in the human body?
A. Releasing hormones to regulate body functions.
B. Circulating oxygen throughout the body.
C. Relating messages between the body and brain.
D. Protecting the body from foreign invaders
Answer:
Correct answer is c
Explanation:
the main purpose of the nervous system is relaying messages between the body and the brain
Relating messages between the body and brain is the main purpose of the nervous system in the human body. So, the correct option is C.
What is the Nervous system?The nervous system is defined as a highly complex part of an animal that coordinates its functions and sensory information by transmitting signals from different parts of its body. The nervous system transmits signals between the brain and the rest of the body which includes the internal organs.
The activity of the nervous system controls the ability to move, breathe, see, think, and many more where the basic unit of the nervous system is a nerve cell or neuron. Relating messages between the body and brain is the main purpose of the nervous system in the human body.
Therefore, the correct option is C.
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give an example of fluid friction
What's a good sentence describing my roller coaster
Final answer:
A roller coaster utilizes the principles of physics, specifically potential and kinetic energy, to create thrilling rides.
Explanation:
A roller coaster is a thrilling ride that is designed to take advantage of the principles of physics. One important concept that comes into play is potential energy. At the start of the ride, the roller coaster is lifted up to the highest point, storing potential energy. As the coaster moves down the track, the potential energy is converted into kinetic energy, causing the coaster to gain speed. This transfer between potential and kinetic energy is what makes roller coasters exciting.
Which statement accurately describes what happens when water turns to steam in terms of energy?
A.The water absorbs energy which causes chemical bonds to break, changing water to steam.
B. The water releases energy which causes the water molecules to have less kinetic and potential energy, changing their configuration from liquid to gas.
C. The water releases energy which causes chemical bonds to break, changing water to steam.
D. The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.
C. The water releases energy which causes chemical bonds to break, changing water to steam.
PLEASE HURRY!!!
Answer:
D The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.
Explanation:
Good Luck ^^
The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas. The correct option is D.
What is kinetic energy?The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it.
We must put in effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.
Energy is absorbed by the water, increasing the kinetic and potential energy of the water molecules and converting them from a liquid to a gas.
Water molecules usually have the highest kinetic energy in the steam phase.
Thus, the correct option is D.
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According to its periodic table entry, how many electrons does nitrogen have in its valence level? 2 5 7 14
How old is the moon!
4.53 billion years
1.653 trillion days
39.68 trillion hours
2.381 × 10^15 minutes
1.429 × 10^17 seconds
Answer:
4.53 billion years old
Explanation:
Moon is considered to be formed about 60 million years later to the formation of the solar system. The rocks brought from surface of moon suggest its age to be about 4.53 billion years. The Giant-impact hypothesis suggests that moon was formed when a Mars sized object collided with the Earth, the debris accreted to from the moon.
Light from a distant star has undergone a red shift. Which of these conclusions is correct about the star? Its pitch is increasing. Its parallax is increasing. It is moving towards Earth. It is moving away from Earth.
Answer:
It is moving away from Earth.
Explanation:
As the source comes closer to the observer then we can say that its frequency will increase.
So here we know that
[tex]\frac{\Delta \nu}{\nu} = \frac{v}{c}[/tex]
here we know that
v = speed of the star
c = speed of light
now if we know that speed of the star is towards us then the frequency will increase and hence the wavelength will decrease.
So it is known as Blue shift
While if the star is moving away from us then in that case the frequency will decrease and hence the wavelength will increase.
So here it is known as Red Shift.
So here correct answer will be
It is moving away from Earth.
From which sphere does most water evaporate?
A. Lithosphere
B. Hydrosphere
C. Biosphere
D. Atmosphere
PLEASE HELP ME!
C. What organelle is missing from E. coli?
Answer:
The organelle missing from E.coli is nuclear membrane.
Explanation:
A nuclear membrane is a double membrane that surrounds and protects the nucleus of a cell. The nuclear membrane is lacking because there is no need for one to protect a nucleus that does not exist. Bacteria cells are also prokaryotes, and all prokaryotes lack a nucleus.
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Mercury is the 80th position in the periodic table how many protons does it have
Amy wants to know whether or not an item will float when placed in a fluid. Which of the comparisons below, when true, will mean that the item will float?
A. The object is made of stone or metal, which always sink.
B. The force of gravity is stronger than the buoyant force.
C. The buoyant force is stronger than the force of gravity.
D. The mass of the item is greater than its gravity.
A boat sails along the shore. To an observer, the boat appears to move at a speed of 22 m/s, and a man on the boat walking forward appears to have a speed of 23.1 m/s. How long does it take the man to move 3 m relative to the boat?
A cyclist rides over the top of a hill. Is the bicycle's motion rotational,translational,or a combination of both?Uniform circular motion.
The motion of a cyclist riding over the top of a hill is a combination of rotational and translational motion, where the wheels rotate and the entire bicycle moves along a path.
The motion involved when a cyclist rides over the top of a hill consists of both rotational and translational components. The wheels of the bicycle exhibit rotational motion because they spin around an axis, which is a clear case of rotational motion, where points in the object move in circular paths centered on one point. At the same time, the entire bicycle with the cyclist is moving along a path that overcomes the hill, which is an example of translational motion. Therefore, the bicycle's motion can be seen as a combination of rotational and translational motion. Interestingly, the rolling motion of a wheel is a classic example of such a combination, where different parts of the wheel are moving with different velocities due to their relative positions with respect to the center of mass or the point of contact with the surface.
Based on the diagram, which of these conclusions is correct? The frequency of Wave 1 is double the frequency of Wave 2. The frequency of Wave 2 is double the frequency of Wave 1. The wavelength of Wave 1 is four times the wavelength of Wave 2. The wavelength of Wave 2 is four times the wavelength of Wave 1.
Answer: The frequency of Wave 2 is double the frequency of Wave 1.
30 PTS
Choose the best answer to describe light waves transmission when it meets a medium. * 1 point Spreads out in the medium Goes into the medium Goes through the medium Bounces off the medium Appears to bend in the medium
What does the person in back of the ambulance experience? A) a lower frequency of the siren B) a lower amplitude of the siren C) a higher frequency of the siren Eliminate D) a higher amplitude of the siren
The answer to your question is "A. a lower frequency of the siren.
Because the person in back of the ambulance will hear a lower frequency of the siren. This is because the waves are stretched out. A longer wavelength results in a lower frequency.
Answer: The correct answer is A.
Explanation:
When there is a relative motion between the source and the observer then there will be change in the frequency or wavelength of the wave. This phenomenon is called Doppler effect.
For example, when the source and the observer are moving away from other then the frequency decreases in this case.
In the given problem, the person is in the back of the ambulance. In this case, the person in the back of the ambulance will listen a lower frequency of the wave. There will be longer wavelength.
Therefore, the correct answer is A.
Why was the Constitution written, according to the Preamble? A. to create a more perfect Union B. to end slavery C. to break free from Britain D. to give women the vote
what is the wavelength of a wave?
A. the amount of time that one full cycle takes.
B. the distance from the beginning to the end of a cycle.
C. the amount of cycles that occur in a given time.
D. the distance traveled by the wave during one full cycle.
the specific heat capacity of iron is 440j(kgK) How much thermal energy is gained when the temeperature of 800g of iron is raised by 120 degrees C?
The thermal energy gained when the temperature of 800g of iron is raised by 120 degrees C is 42,240 J.
Explanation:To calculate the thermal energy gained when the temperature of 800g of iron is raised by 120 degrees C, we can use the equation:
Q = m * c * ΔT
Where:
Q is the thermal energy gainedm is the mass of the iron (in kg)c is the specific heat capacity of iron (in J/kg·K)ΔT is the change in temperature (in K)Plugging in the given values:
Q = (0.8 kg) * (440 J/kg·K) * (120 K) = 42,240 J
Therefore, the thermal energy gained when the temperature of 800g of iron is raised by 120 degrees C is 42,240 J.
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Which formula can be used to find tangential speed of an orbiting object?
Answer:
A) [tex]v = \frac{2\pi r}{T}[/tex]
Explanation:
As we know that the speed of the object is defined as the the ratio of total distance and total time taken
now as we know that here the distance along the path of the orbiting object is total length of the circle
so it is given as
[tex]L = 2\pi r[/tex]
also we know that
time period to complete the orbit is given as
[tex]t = T[/tex]
now the speed is given as
[tex]v = \frac{d}{t}[/tex]
[tex]v = \frac{2\pi r}{T}[/tex]
The farther a planet is from the sun, the _________ its orbital motion is, and the _________ the gravitational attraction between the planet and the sun is.
Question 4 options:
slower, weaker
slower, stronger
faster, weaker
faster, stronger
The orbital motion is slower and gravitational attraction is weaker.
What is Kepler's law of planetary motion ?
Kepler's law of planetary motion states that, the line joining a planet and the sun sweeps equal areas in equal intervals of time. That means, as the planet approaches the sun it speeds up and as it moves away from the sun, it slows down.
Here,
The planet is farther from the sun.
According to Kepler's law of planetary motion, the speed of this planet is decreasing. So, its orbital motion becomes slower and as the distance between the planet and the sun increases, the gravitational attraction between them also becomes weak.
Hence,
The orbital motion is slower and gravitational attraction is weaker.
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1) What describes the unusually large release of plasma from the sun's corona?
Auroras
CME
Solar wind
Solar flare
__________________________________________________________________
2) The table below compares the distances between two bodies.
Comparison of Distance
Bodies Distance
X and Y 30.2 AU
Y and Z 7.2 light years
Based on the table, which of the following statements could be true?
X and Y are both within the solar system.
Y and Z are both within the solar system.
X and Y are farther apart than Y and Z.
Y and Z are both present on Earth.
_____________________________________________________________________
Answer:
CME
Explanation:
They right^ aced the test
Mechanical waves are classified according to a. their size. b. their shape. c. how they move. d. their source. Please select the best answer from the choices provided A B C D
September 21 is the beginning of ________ in the southern hemisphere.
spring
summer
autumn
winter
Answer
Correct answer is Spring
Explanation
In southern hemisphere there are four seasons which are as follows
Spring
spring begins in the month of September
Summer
summer begins in the month of December
Autumn
autumn begins in the month of March
Winter
winter begins in the month of June.
spring
its the correct answer on the test,, goodluckk :)!
If you were on the moon, and you were trying to move a 20-lb bowling ball and a 3-foot cube of Styrofoam, which item would take more work to move? Why? A. the bowling ball; it is a harder object B. the Styrofoam; it is larger C. the bowling ball; it has greater mass anywhere D. the Styrofoam; it weighs more on the moon
what is the shape of the orbit of satellites
Answer:
The shape will be elliptical hopefully this helps!
A compact car with a mass of 1,000 kg, traveling at 15 m/s, runs into and sticks to - an at-rest SUV of 2,200 kg. What is the final speed of the two cars? A. 4.7 m/s B. 67 m/s C. 2.2 m/s D. 147 m/s
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Which would be the best element to use in a semiconductor?
Question 5 options:
lithium (Li)
chlorine (Cl) )
silicon (Si)
carbon (C)
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Describe an environment in which the sound of a ringing cell phone could not be transmitted, and explain why the ringing wouldn't be heard. Justify your reasoning using complete sentences.
Answer:
Explanation:
The sound of a ringing cellphone could not be transmitted or heard if the cellphone is enclosed in some sort of closed container from which the air has been removed. Sound is a mechanical wave, and so it must have some material substanceto travel through. Otherwise sound cannot travel from one place to another. The sound of the ringing could not travel through the vacuum inside the container if all the air were removed.