Answer:
Friction is a force that holds back the movement of a sliding object.
Explanation:
The two types of friction: Static friction and Kinetic friction. Static friction operates between two surfaces that aren't moving relative to each other, while kinetic friction acts between objects in motion.
Final answer:
Friction is a force that resists motion between two contacting surfaces, indispensable yet challenging. There are two primary types: static friction, which acts on objects at rest, and kinetic friction, which occurs once motion has begun. Understanding and calculating these forces are crucial in physics to solve related problems.
Explanation:
Defining Friction
Friction is a force that opposes motion between two surfaces that are in contact. It is an essential force in everyday life, allowing us to walk and drive vehicles without slipping but also poses a challenge as it causes wear and tear on moving parts of machines.
Types of Friction
Static Friction
Static friction occurs between two surfaces that are not moving relative to each other. It needs to be overcome for motion to start. An example of static friction is pushing a stationary car; it takes considerable force to get the car moving.
Kinetic Friction
Kinetic friction, also known as dynamic friction, acts between two surfaces that are in motion relative to one another. An example of kinetic friction is the force you feel when sliding a book across a table.
Calculating Friction
The magnitude of static and kinetic friction can be calculated using formulas that take into account the coefficient of friction between the two surfaces and the normal force exerted between them. These calculations are critical in solving problems involving Newton's laws of motion.
In the Bronsted-Lowry Theory of acids and bases, an acid is this.
In the Brønsted-Lowry theory, an acid is a species that can donate a proton, expanding the definition of acids and bases beyond the Arrhenius theory to include a wider variety of chemical reactions.
Explanation:According to the Brønsted-Lowry theory of acids and bases, an acid is defined as a species that can donate a proton (hydrogen ion, symbolized as H+) to another molecule. This concept was introduced in 1923 when Johannes Brønsted and Thomas Lowry independently proposed that acids and bases should be defined by their ability to donate and accept protons, respectively. This definition broadened the understanding of acids and bases beyond the previous Arrhenius definition, which was limited to substances dissociating in water to provide hydronium and hydroxide ions.
For example, in the reaction between ammonia (NH3) and water (H2O), ammonia acts as a Brønsted-Lowry base by accepting a proton from water, which acts as a Brønsted-Lowry acid. As a result, the ammonium ion (NH4+) and hydroxide ion (OH−) are formed:
NH3(aq) + H2O(l) ⇒ NH4+(aq) + OH−(aq)
An endothermic reaction is defined as a reaction that _____.
A. requires heat or light
B. releases heat or light
C. has more than one product
D. has more than one reactant
Answer:
B.) Releases heat or light
Explanation:
What is a scalar quantity? Vector quantity? How are these two different?
Answer: Scalar quantity has magnitude but no direction while a vector quantity has both magnitude and direction.
Explanation:
A scalar quantity is a physical quantity that has magnitude but no direction. Examples are
- temperature, measured in Kelvin
- distance, measured in metres
- speed, measured in metres per second
Vector quantity, on the other hand, is a physical quantity that have both magnitude and direction. Examples are:
- velocity, measured in metres per second (m/s)
- force, measured in newton
- displacement, measured in metres
Which of the following is NOT a
state of matter?
A. gas
B. light
C. liquid
D. solid
Answer:B
Explanation:
Answer:
b
Explanation:
Because light is not a state of matter
What is electrical
energy?
A
holds the atoms in the molecule
B holds protons and neutrons in the nucleus
C energy carried by light
D energy of moving electrons
Help meeeeeeee
30 points
16. Compared to your weight and mass on Earth, if you were on the moon: *
A. your weight and mass would be less.
B. your weight would be less but your mass would remain the same.
C. your weight would remain the same, but your mass would be less.
D. your weight would increase, but your mass would remain the same.
Answer:
The answer is D.
Explanation:
There is no gravity in Space so that means that it will decrease your weight but not your mass.
Please give BrainiestYour mass would remain the same on the Moon or any other celestial body because it is a constant measure of the matter within you. However, your weight would be less on the Moon due to its weaker gravitational pull compared to Earth. The correct answer, therefore, is B - your weight would be less but your mass would remain the same.
Explanation:When considering the comparison of weight and mass on the Moon versus the Earth, it's important to clarify the difference between the two concepts. Mass is a measure of the amount of matter in an object, and it remains constant regardless of location. On the other hand, weight is the force exerted on an object due to gravity and varies depending on the gravitational pull of the celestial body you're on.
The acceleration due to gravity on the Moon is approximately 1.625 m/s², significantly less than the Earth's gravitational acceleration of 9.80 m/s². So, if you were to move from Earth to the Moon, your mass would remain the same because the quantity of matter you consist of does not change. However, because the Moon's gravity is weaker, you would weigh less. This decrease in weight is attributed to the lower gravitational pull, not to a loss of mass.
The correct answer to the question posed is: B. your weight would be less but your mass would remain the same. This reflects the understanding that while the gravitational force acting on you decreases, the actual matter that you are made of does not change.
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Earthquakes can cause great damage and injury. The solution to this problem is to warn people about possible earthquakes through various forms of media: radio, television, on-line sources. Scientists constantly monitor seismic data to warn people of potential earthquake danger. Which statement BEST summarizes the quality of the solution to this problem?
A) The solution is well designed as early warning can help scientists control earthquakes.
B) The solution is poorly designed since we are not doing anything to stop the destruction of an earthquake.
C) The solution is adequate considering the resources we have; we cannot stop an earthquake but we can alert people so they can protect themselves.
D) The solution is well designed because seismic data can help scientists stop earthquakes as well as warn the human population of the up-coming possible dangers.
Groups of stars that are smaller than galaxies are called
(two words)
Enter the answer
Final answer:
Groups of stars smaller than galaxies are known as star clusters, including open clusters with younger stars, and are much smaller than galaxies like the Milky Way.
Explanation:
Groups of stars that are smaller than galaxies are known as star clusters. These formations range from hundreds to thousands of stars bound together by gravity. Among star clusters, there are two main types: open clusters and globular clusters. The former consists of younger stars that typically have formed out of the same nebula and can include up to a few thousand stars.
Examples include entities like the Jewel Box. On the larger scale, galaxies like the Milky Way are vast collections of stars, with numbers ranging from a few million to many billions. The Milky Way, which contains all the stars we can see in the night sky, has a diameter of about 100,000 light-years, contrasting with the smaller star clusters.
How do lines of latitude affect how direct or indirect the Sun’s rays are on the Earth?
Answer:
Explanation: We have seasons because Earth's axis – the imaginary line that goes through the Earth and around which the Earth spins — is tilted. It's tilted about 23.5 degrees relative to our plane of orbit (the ecliptic) around the Sun. As we orbit our Sun, our axis always points to the same fixed location in space. Our northern axis points almost directly toward Polaris, the North Star.
Car A and Car B are both driving towards each other. Car A's speedometer shows that it is going 30 mph. Car B's speedometer shows that is going 45 mph. What is Car B's speed relative to Car A?
Select one:
-120 mph
-45 mph
-30 mph
-30 mph
-75 mph
Answer:
120 mph I don't know for sure but still this came in my mind
Which of the following is true for the image formed in a plane mirror? (Select all that applies) The image...
A. is behind the mirror
B. has the same size as the object
C. is formed as the same distance from the mirror as the object
D. is flipped relative to the mirror
E. cannot be seen
Answer:
right options are:
A
B
C
D
Which type of motion most accurately describes the behavior of a friction -less pendulum?
A) Circular motion
B) Periodic Motion
C) One - dimensional Motion
D) Two - dimensional Motion
Answer:
B) Periodic Motion
Explanation:
When a pendulum is friction-less, i.e there are no damping forces acting on it, its motion will be periodic, i.e it will bob up and down going from potential energy to kinetic energy and back. Thus, the motion of the pendulum can be best described by the term "period motion", hence choice B.
If however, forces do act on the pendulum, and if they acts as to damp the pendulum, it will oscillate less and less as time goes by, and eventually come to a stop (in the real world this damping force is usually air resistance ). And if the force acts in such a way that it increases the oscillations, the pendulum will swing higher and higher, and the system will go haywire! :)
Approximately eleven million people are diagnosed with cancer each year. Thus, many countries, including the United States, spend millions of dollars annually on cancer research. Which of the following statements is best supported by the above information?
A.
The United States is the only country concerned about cancer.
B.
More money should be spent on science.
C.
Social concerns can affect science.
D.
Cancer is the only disease that should be researched.
Answer this question and you get brainliest. Ok, ok
9+10=?
Answer:
C.
Explanation:
(Coronita virus)
17
Answer:
i dont know
Explanation:
Which of the following best describes a direct current?
A. A circuit that has only series or only parallel components
B. Charge that jiggles back and forth very quickly
C. Charge that moves in a single direction
D. A circuit that has both series and parallel components
Best description a direct current is Charge that moves in a single direction.
What is charge?Charged material experiences a force when it is exposed to an electromagnetic field due to the physical characteristic of electric charge. You might have a positive or negative electric charge. Unlike charges attract one another while like charges repel one another.
A positively charged nucleus and one or more negatively charged particles known as electrons make up an atom.
Best description a direct current is Charge that moves in a single direction.
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Answer:
C. Charge that moves in a single direction
Explanation:
HELP PLEASE!
Which of the following statements is a true statement about the use of nuclear energy as an alternative energy source?
A. Production of electricity from nuclear energy does not produce dangerous radioactive waste products.
B. Production of electricity from nuclear energy is a lot more expensive than production of energy from fossil fuels.
C. Production of electricity from nuclear energy does not produce greenhouse gases that contribute to global warming.
D. Uranium is a renewable resource
Answer: C
Production of electricity from nuclear energy does not produce greenhouse gases that contribute to global warming
Explanation: Nuclear energy is considered as non-renewable energy source. Although nuclear energy itself is a renewable energy source, the material used in nuclear power plants is not.
Nuclear power emits more greenhouse gases per kilowatt hour than all renewables, including biomass, hydroelectric, solar and wind. Reactors produce significantly less carbon dioxide than all fossil fuels. We can therefore conclude that Production of electricity from nuclear energy does not produce greenhouse gases that contribute to global warming.
The answer is C. Production of electricity from nuclear energy does not produce greenhouse gases that contribute to global warming. Sorry that this is super late, but I still wish you good luck with the rest of your work!
compare water(H20) to a single atom of oxygen(O) . is each an element or a compound explain
Answer:
compound
Explanation:
A compound is composed of two or more different elements combined together. Water is made up of 2 atoms of hydrogen and one atom of oxygen combined together. Water is therefore made up of two separate elements, which makes it a compound.
Water (H₂O) is a compound made of hydrogen and oxygen in a fixed ratio, while a single atom of oxygen (O) is an element.
Elements consist of only one type of atom, while compounds are made of multiple types of atoms.
1. If a Creature Cat's Ferrari With an initial speed of 15 m/s, accelerates at a rate of 60/m/s/s for 5 s, what
will the final speed be?
Answer:
v = 315m/s
Explanation:
a = v - u /t
a = acceleration 60m/s2
v = final speed
u = initial speed 15m/s
t = time 5 secs
Therefore
60 = v - 15 /5
Cross multiply
v - 15 = 60 x 5
v - 15 = 300
Add 15 to both sides
v - 15 + 15 = 300 + 15
v = 315m/s
A student adds 10 mL of hydrochloric acid to a 20 ml sodium hydroxide solution. What will most likely happen to the pH of the solution?
Answer: The pH decreases
Explanation:
- Hydrochloric acid, as an acid has a pH value below 7
- Sodium hydroxide, as an alkali has a pH value above 7.
The alkali neutralizes the acid to give a salt as in the equation:
HCl(aq) + NaOH(aq) --> NaCl(aq) + H2O(l)
Hence, the aqeous sodium chloride, NaCl has a pH value of 7 (neutral) which is then a decrease from the above 7 pH value of the sodium hydroxide solution.
Thus, the pH decreases
Help ASAP, will give brainliest!!!
Which type of nuclear reaction produces a neutron, energy, and one large nuclei?
A. nuclear fission
B. nuclear fusion
C. thermodynamic reaction
D. combustion
Answer:
A
Explanation:
I think it is Nuclear fission because it can release a large amount of energy.i hope this helps☺️
What is meant by the phrase "color by subtraction of
light?"
Answer: adding green, red, and blue light produces white light
Explanation:the process of color subtraction is a useful way of predicting the color appearance of an object, if the color of the light and pigments are known. If you use the complementary color scheme, the colors of light that will be absorbed by a given material are determined.
Final answer:
The phrase "color by subtraction of light" describes the process where color is created by absorbing certain wavelengths while reflecting others, used in subtractive color theory applications like printing and photography.
Explanation:
Subtractive Color Theory
The phrase "color by subtraction of light" refers to the subtractive color theory, which is a method of creating color by filtering out certain wavelengths of light. This concept is commonly used in color printing and photography, where colors are produced by absorbing parts of the light spectrum and reflecting the rest. For example, when blue paint is applied to a canvas, it absorbs all colors except for blue, which is reflected back to the eyes of the viewer.
In subtractive color mixing, the primary colors are red, yellow, and blue. When these are mixed, they produce the secondary colors of green, orange, and purple. This is the opposite of additive color theory, where colors are created by mixing different lights (red, green, and blue) and the combination of all creates white light. The sensation of color in photographic transparencies is achieved by the substrate absorbing specific wavelengths of light — for instance, to display blue, the material must absorb yellow light.
Subtractive color theory is essential in the development of the CMYK color model, which uses cyan, magenta, and yellow as primary colors, and is central to processes such as full-color printing and other applications where pigmentation and light reflection play a critical role in color creation.
5. Describe the sequence of mechanical
energy events that lets you hear the muffled
sound of a radio from inside your neighbor's
closed house. Write your response in your
Science Journal. sc.7.P.10.3
Answer:
Answer:
Starting from the beginning.
There is a radio signal that is received by the radio.
The radio interprets the signal and produces a current in response to it.
That current goes to a membrane that oscillates producing sound, the oscillation of the membrane is the first mechanical energy event here.
These oscillations can travel in material mediums, for example, the air. Then there is a production of waves (soundwaves) that travel in the air (second event).
Those waves now hit the wall that separates you and your neighbor, as the wall is made of a material, the soundwaves can travel through it, but they will be dispersed (a part of the waves rebounds on the wall, and another part is dissipated as the wave travels through the wall), there is also a transmitted part of the wave, that is now in your house. (this change of medium will be the third event). Now only the lower frequencies survive, this is why the sound is "muffled".
Those remaining frequencies now travel in your house, and when they reach your ear, your ear sends a signal to your brain and your brain interprets them as sound. The wave interacting with your ear will be the fourth and last mechanical energy event.
Explanation:
Final answer:
The sequence of mechanical energy that allows you to hear a muffled radio sound includes the radio's speaker vibrations creating sound waves, which then cause a house's walls to vibrate and transfer the sound externally.
Explanation:
The sequence of mechanical energy events that allow you to hear the muffled sound of a radio from inside your neighbor's closed house starts with the radio producing sound waves. These sound waves are created by the vibration of the radio's speakers, which cause the air molecules around them to vibrate as well. The vibrating air molecules then transfer the energy to the walls of the house, which vibrate slightly and in turn, transfer some of this vibrational energy back to the air on the outside of the house. Despite being reduced in energy, these vibrations can still create sound waves in the outside air that may reach your ears as a muffled sound.
During the process, energy is conserved as it changes forms, from the electrical energy used to power the radio turning into sound energy, which is then transformed into mechanical energy as the house's walls and structure vibrate. Ultimately, when these vibrations reach your ears, tiny bones in your inner ear vibrate, translating these mechanical vibrations into electrical signals that your brain interprets as sound.
Why is your reflection upside down (inverted) on a spoon when you are far away from it
Answer:
because the spoon it is concave
Explanation:
What is the dry adiabatic rate?
Answer:
Explanation:
he dry adiabatic rate is the rate at which dry air changes its temperature as a result of expansion or compression. The dry adiabatic rate is 1.0o C/100 meters. Air rises and cools at the dry adiabatic rate up to the level of condensation where dew point temperature is reached.
The dry adiabatic rate is the rate of temperature change in unsaturated air as it ascends or descends in the atmosphere, approximately 1 degree Celsius per 100 meters. This rate applies until the air becomes saturated, after which it cools at the wet adiabatic rate.
Explanation:The dry adiabatic rate, often used in meteorology, refers to the rate at which a parcel of dry or unsaturated air changes temperature as it moves vertically in the atmosphere. This rate is approximately 1 degree Celsius per 100 meters (or 10 degrees Celsius per kilometer) of ascent or descent. However, this rate holds true only for dry or unsaturated air; once air becomes saturated, it cools at a different rate known as the wet adiabatic rate.
To illustrate, imagine a balloon filled with air that's heated and starts to rise. As the balloon ascends, the pressure around it decreases. This causes the air in the balloon to expand and cool. This cooling process continues at the dry adiabatic rate until the air in the balloon becomes saturated.
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Describe the relationship between force and mass when the acceleration of two objects remain constant
Answer:
If they both remain constant they ain't moving, It states that the rate of change of velocity of an object is directly proportional to the force applied and takes place in the direction of the force. It is summarized by the equation
Explanation:
The molecular compound that has a ratio of two oxygen atoms
to one carbon atom is named
Carbon dioxide
MoleculesA molecule is a chemically bound collection of two or more atoms that are electrically neutral. The absence of an electrical charge distinguishes molecules from ions. A molecule is a group of two or more atoms of the same or distinct elements that are chemically linked together.The chemical molecule with a two-to-one oxygen-to-carbon atom ratio is known as carbon dioxide.Find out more information about the carbon dioxide:
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IF SOMEONE CAN ANSWER THESE QUESTIONS ILL GIVE BRAINLIEST!!!!! Pls
Answer:
4.Gravity
5.compressible
6.shear force
Explanation:
NEED HELP please.
1.) A laser beam is reflected by a plane mirror. It is observed that the angle between the incident and reflected beams is 46 degrees. What is the angle of the incident?;
2.) A ray of light reflects from a plane mirror with an angle of incident of 25 degrees. What is the angle between the plane of the mirror and the reflected beam?
Answer:
1. 23°
2. 65°
Explanation:
1.
The law of reflection provides that for the same medium, the angle of reflection equals the angle of incidence.
Similarly, here, angle of incidence and reflection will be 46°÷2=23°
2. Since the normal, angles of reflection and incidence lie on the same plane and also the angles of reflection and incidence are equal then the angle between the plane of the mirror and the reflected beam will be given by 90-25=65°
Final answer:
To address the two light reflection questions: 1.) The angle of incidence, when the angle between incident and reflected beams is 46 degrees, is 23 degrees. 2.) When a light ray reflects from a mirror with an angle of incidence of 25 degrees, the angle between the plane of the mirror and the reflected beam is 65 degrees.
Explanation:
The question involves understanding the law of reflection, which states that the angle of incidence is equal to the angle of reflection. This law is fundamental in analyzing how light interacts with reflective surfaces such as mirrors.
1.) If the angle between the incident and reflected beams is 46 degrees, then considering the law of reflection, we must recognize that the angle of incidence is half the angle between the beams because the incident ray and the reflected ray make equal angles with the normal to the mirror surface. Therefore, the angle of incidence is 46 degrees / 2, resulting in an angle of incidence of 23 degrees.
2.) Given an angle of incidence of 25 degrees, the reflected beam will also be at an angle of 25 degrees with the normal (due to the law of reflection). The angle between the plane of the mirror and the reflected beam, which is asked for, is not the same as the angle of reflection. In this case, since angles are measured from the normal, the angle between the mirror plane and the reflected beam is 90 - 25 = 65 degrees.
A slinky forms it’s third harmonic standing wave when the input frequency is 24 Hz. What is the fundamental frequency of the slinky? Will an input frequency of 28 Hz create a standing wave? Explain your answer.
Answer: The fundamental frequency of the slinky = 8Hz
An input frequency of 28 Hz will not create a standing wave
Explanation:
Let Fo = fundamental frequency
At third harmonic,
F = 3Fo
If F = 24Hz
24 = 3Fo
Fo = 24/3 = 8Hz
If an input frequency = 28 Hz at 3rd harmonic
Let find the fundamental frequency
28 = 3Fo
Fo = 28/3
Fo = 9.33333Hz
Since Fo isn't a whole number, it can't create a standing wave
What is the current in a 160V circuit if the resistance is 2Ω? V= I= R =
Answer:
80 amperes
Explanation:
Current in the circuit = ?
Voltage in the circuit = 160 Volts
Resistance = 2 Ω
Voltage = Current x Resistance
V = IR
160V = I x 2 Ω
I = 160V / 2 Ω
I = 80 Amperes
Therefore the current in the circuit is 80 amperes :)
The current through the 160V circuit with a resistance is 2Ω is 80 Ampere.
What is the current flowing through the circuit?From Ohm's law, the relationship between voltage (V), current (I), and resistance (R) can be expressed as:
V = I × R
Given the parameter:
Voltage V = 160 V
Resistance R = 2 ohms
Current I = ?
Plug the given value into the equation and solve for the current I:
V = I × R
160 = I × 2
I = 160/2
I = 80 Ampere
Therefore, the current I is 80 Ampere.
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We all know that the Earth cycles through a regular pattern of days and nights.
What causes this pattern?
A) The tilt of the Earth on its axis.
B) The sun turns on, and then goes out.
C) The rotation of the Earth on its axis.
Eliminate
D) The rotation of the sun around the earth.