Answer:
Assuming no air resistance and a constant downward vertical acceleration of 9.81 m/s2 due to gravity, Tarzan's speed at the bottom of the swing would be:
v = √(2 * 9.81 * 28.7 m / sin(2*33.0°)) = 45.0 m/s
Which form of energy is NOT correctly associated with the related example?A. kinetic energy: fat moleculesB. kinetic energy: movement of musclesC. chemical energy: glucoseD. potential energy: water held behind a damE. potential energy: ATP
Answer:
kinetic energy;fat molecules
Explanation:
fat molecules rather provides potential energy..so , the correct option is kinetic energy;fat molecules
What type of reaction occurs when gasoline is burned in an engine?
A. Exothermic, because energy is absorbed from the surroundings
B. Endothermic, because energy is released into the surroundings
C. Endothermic, because energy is absorbed from the surroundings
D. Exothermic, because energy is released into the surroundings
Answer:
D
Explanation:
The correct answer is D. Exothermic, because energy is released into the surroundings. When gasoline combusts, the chemical bonds that were holding together the molecules of the fuel and oxygen are broken, releasing energy in the form of heat and light. This energy is then used to power the engine.
what is newtons to lbs?
Answer:
Explanation: I assume that you are asking how to convert Newtons into pounds.
1) first we must use the equation F=M*g where F is force in Newtons, M is Mass in kg, and G is the Acceleration caused by earths Gravity (9.8m/s/s).
2) we plug in our Newtons of force and acceleration of gravity and solve fore mass
3) now we take our mass in kg and convert it to lb using the conversion factor 1 kg= 2.2 lb
Ex) 20=M*9.8 therefore M=2.041kg
2.041 kg * 2.2 lb = 4.49 lbs
how to use the time allocated effectively in an examination
Answer: no se
Explanation:no se
what properties of the universe make it ""ready"" for life forms like you?
There are several key properties of the universe that make it "ready" for life forms like us. One of the most important is the abundance of carbon, which is essential for life as we know it.
Carbon is a versatile element that can form a wide variety of complex organic molecules, including the building blocks of proteins, DNA, and other essential biomolecules.
In addition to carbon, the universe also contains a wide range of other elements, including hydrogen, oxygen, nitrogen, and phosphorus, which are also crucial for life. The abundance of these elements is the result of processes such as stellar nucleosynthesis and supernova explosions, which occur throughout the universe.
The physical properties of the universe, such as its size, age, and rate of expansion, also play a role in making it "ready" for life. For example, the universe is large enough to contain a vast array of stars and galaxies, which provide the energy and raw materials necessary for life. At the same time, the universe is not too old or too young, which allows for the emergence of complex life forms within a reasonable timeframe.
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Which star has the lowest luminosity?
Answer:
Rigel
Explanation:
Because it has the lowest abslout magnitude.
What instrument is used to measure relative humidity?
a. an anemometer
b. a barometer
c. a wind vane
d. a psychrometer
The correct answer is (e) Hygrometer. A hygrometer is an instrument for measuring the relative humidity of the atmosphere. The hygrometer was invented by Leonardo da Vinci.
Hygometer:
A hygrometer is an instrument that measures the humidity of air or another gas: that is, the amount of water vapor it contains. Instruments for measuring humidity usually rely on measuring some other quantity, such as temperature, pressure, mass, mechanical or electrical changes of a substance as it absorbs moisture . Through calibration and calculation, these measurements can lead to humidity measurements. Modern electronics use condensing temperature (called dew point) or detect changes in capacitance or resistance to measure humidity differences. In 1480, Leonardo da Vinci invented a crude hygrometer.
The 1600s saw a huge leap forward; Francesco Folli invented a more practical device, while Robert Hooke improved many meteorological devices, including the hygrometer. In 1755 the Swiss polymath Johann Heinrich Lambert created a more modern version. Then, in 1783, Swiss physicist and geologist Horace Bénédict de Saussure invented the first hygrometer to measure humidity using human hair.
The maximum amount of water vapor (saturation) that can be held in a given volume of air varies greatly with temperature; cold air can hold less water per unit volume than warm air. Temperature can change humidity.
Complete Question:
What instrument is used to measure relative humidity?
a. an anemometer
b. a barometer
c. a wind vane
d. a psychrometer
e. a Hygrometer.
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By how many orders of magnitude (powers of ten) does density vary for metals? (choose the closest value/ approximate value)
Note: Density of metals ranges from 1 g/cm3to about 30 g/cm3
(a) 0.13
(b) 1.3
(c) 13
(d) 130
The range of densities for metals is from 1 g/cm3 to about 30 g/cm3, which is a difference of one order of magnitude (10 times) approximately. Therefore, the closest option is (b) 1.3.
The density of metals typically ranges from 1 g/cm3 to about 30 g/cm3. This range represents a difference of approximately one order of magnitude (10 times) between the lowest and highest densities. Therefore, the closest option to the correct answer is (b) 1.3, which represents a difference of approximately one order of magnitude between the lowest and highest densities of metals.
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A copper wire is stretched so that its length increases and its diameter decreases. As a result, a) both the wire resistance and resistivity increase. b) the wire resistance increases but its resistivity stays the same. c) the wire resistance increases and its resistivity decreases. d) the wire resistance decreases but its resistivity stays the same. e) both the wire resistance and resistivity decrease.
Answer:
C. The wire resistance increases and its resistivity decreases. When a copper wire is stretched so that its length increases and its diameter decreases, the increase in length makes the wire more resistant to electrical current. Since resistivity takes into account the wire's cross-sectional area, the decrease in diameter causes its resistivity to decrease as well.
Answer:
The correct answer is (b) the wire resistance increases but its resistivity stays the same.
Explanation:
The electrical resistance of a wire is given by the formula R = (ρL)/A,
(where R is resistance,
ρ is resistivity,
L is length,
A is the cross-sectional area of the wire)
When we stretched the copper wire so that its length increases and its diameter decreases, both the length and area of the cross-section of the wire changes. The length increases, which means the resistance will increase. The cross-sectional area decreases, which means the resistance will also increase.
Since the resistivity of copper is a constant that depends on the material, it will not change as a result of stretching the wire. Therefore, the correct answer is (b) the wire resistance increases but its resistivity stays the same.
how does the shape of the parachute affect the descent?
The parachute is slowed down by air resistance due to the material's enormous surface area. The larger the surface area the more air resistance and the slower the parachute will drop.
What is Air Resistance?On Earth, we frequently take drag, also known as air resistance, for granted. We simply assume that whether we launch an aeroplane, deorbit a spacecraft, or fire a bullet from a gun, they will automatically slow down as they pass through our atmosphere. But why is this happening? How exactly does air slow down an object, whether it is falling or flying? Understanding air resistance is essential to understanding physics and a fundamental component of many scientific fields due to our reliance on air travel, our enthusiasm for space exploration, and our love of sports and lifting things into the air (including ourselves). is a component of the field of fluid dynamics.
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which 802.11 standard functions in both the 2.4-ghz and 5-ghz bands?
The 802.11n standard, also known as "Wireless-N," is a Wi-Fi networking standard that supports both the 2.4 GHz and 5 GHz frequency bands.
This standard was released in 2009 and is backward compatible with earlier Wi-Fi standards such as 802.11a/b/g.
One of the key advantages of 802.11n is its ability to provide higher data rates and improved reliability by using multiple antennas and advanced signal processing techniques. This allows for greater throughput and less interference, particularly in the 5 GHz band, which is less congested than the 2.4 GHz band.
The 2.4 GHz band provides better range and is better suited for low-bandwidth applications such as email and web browsing. However, it can be susceptible to interference from other devices such as microwaves and cordless phones. In contrast, the 5 GHz band is less prone to interference and provides higher throughput, making it ideal for high-bandwidth applications such as video streaming and online gaming.
Overall, the 802.11n standard's ability to operate in both frequency bands makes it a versatile and widely adopted Wi-Fi standard for a variety of applications.
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What name given to elements that are usually brittle and poor conductors of heat and electricity
"The name given to elements that are usually brittle and poor conductors of heat and electricity are non-metals."
Non-metals are elements that frequently gain electrons during chemical reactions to create anions. These substances are electronegative ones. They lack lustre, are fragile, and are bad heat- and electricity-conductors (except graphite).
There aren't enough free electrons in non-metals to allow for electrical current to travel. and are therefore poor electrical insulators. The only non-metals that are both brittle and non-ductile are phosphorous and sulphur.
F, Cl, Br, and I are atoms found in halogens. At room temperature, the halogens are either gases or extremely brittle substances. They have a drab look and are brittle gases or solids. Halogens don't transmit electricity well.
Thus, non-metals are brittle and poor conductors of heat and electricity.
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what is moment of inertia units?
Its units depend on the system of units used to measure mass, length, and time. In the International System of Units (SI), the moment of inertia has units of kilogram-meter squared (kg·m²).
The Moment of inertia is a physical quantity that measures an object's resistance to rotational motion. In other systems of units, such as the English system, the moment of inertia can be expressed in units such as slug-ft² or lb-in². The moment of inertia plays a significant role in physics and engineering, particularly in the study of rotational dynamics and the design of rotating machinery.
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A 100-L container is filled with 1 kg of air at a temperature of 27°C. The gas constant of air is R = 0.287 kPa.m kg K = 0.287 kg.K.. What is the pressure in the container? Tak ( Peym') = 7 kPa.m The pressure in the container is kPa.
A 100-L container is filled with 1 kg of air at a temperature of 27°C tehn the pressure in the container is 2.756 kPa.
What is Ideal Gas Law?
The ideal gas law is a fundamental law of physics that describes the behavior of an ideal gas. It is a mathematical relationship between the pressure, volume, temperature, and number of moles of a gas. The ideal gas law is expressed as:
PV = nRT
where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of gas, R is the gas constant, and T is the temperature of the gas.
To calculate the pressure in the container, we can use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature.
First, we need to determine the number of moles of air in the container. We can use the relationship between mass, number of moles, and molar mass:
n = m/M
The molar mass of air can be calculated by summing the molar masses of the individual components of air:
M = (0.78 × 28 g/mol) + (0.21 × 32 g/mol) + (0.01 × 44 g/mol) = 28.97 g/mol
Converting the mass of air to grams and dividing by the molar mass gives:
n = (1000 g)/(28.97 g/mol) = 34.52 mol
Now we can substitute the values into the ideal gas law and solve for the pressure:
P = (nRT)/V
P = (34.52 mol × 0.287 kg.K/mol × (27+273) K)/100 L
P = 2.756 kPa
Therefore, the pressure in the container is 2.756 kPa.
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a tracer is a substance with what attached to it?
A radioactive tracer atom with carrier molecules attached to them. They are used in alternate medicine known as radioactive medicine therapy.
Using radioactive tracers (also known as radiopharmaceuticals) to diagnose and treat disease, nuclear medicine is a branch of medicine. Doctors are able to follow the passage of these radioactive tracers thanks to specially created cameras. Carrier molecules that are firmly bound to a radioactive atom make up radioactive tracers. Depending on the goal of the scan, these carrier molecules can have many different forms. Some tracers use chemicals that interact with certain body proteins or sugars, and some even use the patient's own cells. A patient receives an intravenous injection of the radioactive tracer for the majority of nuclear medicine diagnostic procedures.
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does the electric potential energy increase, decrease, or stay the same? explain. match the words in the left column to the appropriate blanks in the sentences on the right.
A charge's electric potential energy is decreasing if it is travelling in the direction that it would typically go. If a charge is pushed against the direction in which it would typically go,
What exactly does potential energy mean?Potential energy is a form of stored energy that is influenced by how different system components communicate with one another. When a spring is stretched or squeezed, its potential energy rises.
What do the terms potential energy and kinetic energy mean?The energy that is held in any object or system due to its location or component configuration is known as potential energy. Air pressure and altitude are external factors that have no bearing on the item or system. On the other hand
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how to convert pa to kpa
To convert Pascal (Pa) to Kilopascal (kPa), you can use the following formula:1 kPa = 1000 Pa and 1 Pa = 0.001 kPa
Pascal's theory refers to the scientific contributions of Blaise Pascal, a French mathematician, physicist, and philosopher who lived in the 17th century. Pascal's work made significant contributions to several areas of science, including mathematics, physics, and hydrodynamics.
One of Pascal's most famous contributions to science is his work on hydrostatics, the study of fluids at rest. He discovered that the pressure exerted by a fluid at rest is the same in all directions, a principle known as Pascal's law. This law has important applications in many fields, including hydraulic systems, which rely on the transfer of pressure through fluids to power machines.
Pascal also made contributions to the study of probability theory, including the development of a mathematical theory of probability and the use of probability to solve problems in gambling. He also made important contributions to the development of the mechanical calculator, a precursor to modern computers.
Therefore, to convert Pa to kPa, you can divide the value in Pa by 1000. For example, if you have a pressure of 5000 Pa and want to convert it to kPa, you can divide 5000 by 1000 to get:
5000 Pa / 1000 = 5 kPa
So, 5000 Pa is equivalent to 5 kPa.
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Five balls move through the air as shown in the figure . All five have the same size and shape. Air resistance is not negligible. Rank in order, from largest to smallest, the magnitudes of the accelerationsa_{\rm{a}}toa_{\rm{e}}. Some may be equal.
The magnitudes of the accelerations aₐ to aₑ of the five balls can be ranked as follows:
aₑ > aₔ > aₒ ≈ aₘ > aₐ.
The five balls in the air experience different magnitudes of acceleration due to air resistance and gravity. The ball labeled "e" experiences the largest acceleration as it is falling due to gravity and also experiencing air resistance. The ball labeled "a" experiences the smallest acceleration as it moves perpendicularly through the air. The other three balls, labeled "o", "m", and "q", experience intermediate accelerations due to differences in their mass and surface area. The ranking of the magnitudes of the accelerations of the five balls, from largest to smallest, is aₑ > aₔ > aₒ ≈ aₘ > aₐ.
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how to convert quarter to g
"Quarter" and "g" are not compatible units of measurement, so it's not possible to directly convert one to the other.
A "quarter" is a unit of measurement commonly used in the context of weight, particularly for measuring quantities of livestock or meat. It refers to a quarter of a whole animal carcass, typically a cow, pig, or lamb. The weight of a quarter can vary widely depending on the size and breed of the animal.
On the other hand, "g" is a unit of measurement for weight or mass in the metric system. It stands for grams, which is a small unit of mass equal to 0.001 kilograms.
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An electrical current has a low voltage and a low amperage. What does the amperage represent in the electrical current?
The amperage represents the rate at which electric charge flows through a conductor.
What is amperage?
Amperage is a measure of electrical current, or the rate at which electrical charge flows through a circuit. It is measured in units of amps (A). Amperage is related to voltage and resistance in an electrical circuit, and can be calculated using Ohm's law. Amperage is important to consider when sizing electrical components and wiring for a circuit, as too much amperage can cause damage to the components.
The amperage, also known as current, represents the rate at which electric charge flows through a conductor. It is measured in amperes (A) and is a measure of the quantity of electric charge that passes through a given point in a circuit per unit of time. In other words, amperage is a measure of how many electrons are flowing through a wire at a given moment. A low amperage means that there is a small amount of electric charge flowing through the conductor. This could be because the resistance of the conductor is high, or because the voltage of the power source is low. A low voltage, on the other hand, means that there is a small potential difference between two points in a circuit, which means that the electric charge is not being pushed as hard and may not be flowing as quickly.
Therefore, it represents the rate at which electric charge flows through a conductor.
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which kind of natural disaster claims more lives in the united states on an average year?
On average, lightning claims more lives in the united states a year in the U.S.
An electrical discharge which is caused by imbalances between storm clouds and the ground is Lightning. Lightning mostly occurs within the clouds.
Lightning is not only spectacular, but it’s also dangerous. On average nearly 2,000 people's life is claimed worldwide by lightning each year. Even though hundreds may survive strikes but suffer from a difference of lasting symptoms, which include dizziness, numbness, weakness, memory loss, and other life-altering ailments.
Cardiac arrest and severe burns can also be caused by Strikes, but 9 of every 10 people survive. About a 1 in 5,000 chance of being struck by lightning during a lifetime is noticed by average Americans.
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two charges, -2q and q, are located on the x-axis, as shown above. point p, at a distance of 3d from the origin o, is one of two points on the positive x-axis at which the electric potential is zero. how far from the origin o is the other point?
The distance from the origin to the other point is 7d.
To find the distance of the other point on the positive x-axis where the electric potential is zero, we can use the principle of conservation of energy. The electric potential energy at any point P on the x-axis is given by the equation:V = k(2q/q)d - k(2q/q)(4d) + k(q/q)(x - 3d)
where,
k is Coulomb's constant and
x is the distance of point P from the origin O.
At the two points on the positive x-axis where the electric potential is zero, the electric potential energy is equal to zero. Therefore, we can set V equal to zero and solve for x to find the two points.0 = k(2q/q)d - k(2q/q)(4d) + k(q/q)(x - 3d)
Simplifying and solving for x, we get:
x = 7d
Therefore, the distance from the origin O to the other point on the positive x-axis where the electric potential is zero is 7d.
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what is mars bigger than earth?
Mars is actually smaller than Earth.
Mars is the fourth planet from the sun in our solar system and is often referred to as the "Red Planet" due to its distinctive rusty color.
Mars has a diameter of approximately 6,779 km, which is about 53% of the diameter of Earth, which has a diameter of approximately 12,742 km. Mars also has only about 11% of the mass of Earth.
Although Mars is smaller than Earth, it is still one of the largest planets in our solar system, with a surface area of approximately 144 million square kilometers, which is about 28% of the total surface area of Earth.
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relative humidity can range from ____________ and is used by meteorologists to calculate ____________ .
Relative humidity is a crucial weather parameter that can range from 0% to 100% and is used by meteorologists to calculate various weather conditions like dew point, heat index, and precipitation.
Relative humidity is a measure of the amount of water vapor present in the air, expressed as a percentage of the maximum amount of water vapor that the air could hold at a given temperature. The range of relative humidity can vary widely depending on location, season, and weather conditions. Generally, relative humidity can range from as low as 0% in very dry environments to as high as 100% in extremely humid conditions.
Meteorologists use relative humidity as a key parameter to calculate several weather conditions such as dew point, heat index, and precipitation. The dew point is the temperature at which the air becomes saturated with water vapor, resulting in the formation of dew or fog. Heat index is a measure of how hot it feels. Precipitation is influenced by relative humidity as it determines how much moisture is present in the air that can condense and fall as rain or snow.
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how distance will it take to safely pass another car, traveling at 45 mph?
It would require at least 732 feet of clear, straight road to pass the other car safely while traveling at 45 mph, assuming a 2-second following distance and 10 seconds to complete the passing maneuver.
The distance required to safely pass another car while traveling at 45 mph depends on several factors, including the speed of the other car, the speed of the passing car, and the time required to complete the passing maneuver.
The general rule of thumb for passing another car safely is to allow at least a 2-second following distance between your car and the car in front of you, and then add additional distance to account for the time required to complete the passing maneuver. This means that if the other car is traveling at 45 mph, you should be at least 2 seconds behind them before attempting to pass.
Assuming that your car is also traveling at 45 mph and you need 10 seconds to complete the passing maneuver, the total distance required to pass the other car safely would be:
Distance = (2 seconds following distance) x (45 miles/hour) + (distance traveled during passing maneuver)
The distance traveled during the passing maneuver depends on the speed of your car and the length of time required to complete the pass. If you are traveling at 60 mph during the passing maneuver, the distance traveled would be:
Distance traveled during passing maneuver = (60 miles/hour) x (10 seconds) = 600 feet
Substituting this value into the equation, we get:
Distance = (2 seconds) x (45 miles/hour) + 600 feet = 132 feet + 600 feet = 732 feet
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of the following, which color represents the lowest surface temperature for a star?
A. Red
B. Blue
C. White
D. Black
D. Black represents the lowest surface temperature for a star.
What is surface temperature?Surface temperature refers to the temperature of the surface of an object or a material. In astronomy, it usually refers to the temperature of the outer visible layer or "surface" of a star. This temperature can be estimated by measuring the radiation emitted by the star and analyzing its spectrum.
Here,
Black color refers to objects that absorb all colors and do not reflect any, indicating that they do not emit any significant radiation. Stars with low surface temperatures are not hot enough to emit visible light, so they appear black or invisible to the eye. However, they still emit some radiation, usually in the form of infrared light, which can be detected using specialized equipment.
Of the colors listed, red is actually the color associated with the lowest-temperature stars that are visible to the eye, while blue is associated with the hottest. However, stars with even lower surface temperatures will not emit visible light and would be invisible or appear black.
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Which type of objects occur in the halo of our Milky Way galaxy? H-II Regions.
Spiral Arms.
Globular clusters.
Stars with high metal abundance.
None of the above.
The type of objects occur in the halo of our Milky Way galaxy are Globular clusters. Correct option is C.
Globular groups, sub-dwarf stars, and RR Lyrae stars with little metal are all found in the stellar halo of the Milky Way. The majority of the stars in our stellar halo are older (more than 12 billion years old) and less metallic than disc stars, but some halo star groups have metal contents that are comparable to disc stars.
Very few, dispersed stars and globular groups reside in the halo. In spiral galaxies, dark matter also resides in the fringe.
The visible part of what is more generally referred to as the galactic halo is the stellar corona of the Milky Way. Dark matter dominates this galactic halo, and the gravity it produces is the only way to detect its existence. Each galaxy has a unique dark matter ring. And the correct option is C.
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a 4 kg block with initial speed 10 m/s slides across a rough horizontal floor before coming to rest. the frictional force acting on the block is 87 n. how far does the block slide before coming to rest?
The block slides 2.30 meters before coming to rest.
What is frictional force?Force generated by two surfaces that contact and slide against each other is called frictional force.
As we know, W = F d
W is the work done, F is force of friction, and d is distance over which the force acts.
v² = u² + 2as
v is final velocity (zero in this case), u is initial velocity (10 m/s), a is acceleration (which we can find using Newton's second law), and s is distance traveled.
s = (v² - u²) / 2a
Given, u = 10 m/s; v = 0 m/s
As a = F / m = 87 N / 4 kg = 21.75 m/s^2
s = (0 - 10²) / (2 x 21.75) = -100 / 43.5 = -2.30 m
|s| = 2.30 m
Therefore, the block slides 2.30 meters before coming to rest.
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what is a push or pull that can change the motion of an object?
Answer: well simply it is A force.
Explanation: so my friend A force is any push or pull that causes an object to move, stop, or change speed or direction therefore the answer is a force.
which particles in an atom are ‘light’ particles? ____________________________
The particles in an atom that are considered "light" are the electrons.
The three types of particles found in atoms are protons, neutrons, and electrons. Protons and neutrons are found in the nucleus of the atom, while electrons orbit around the nucleus in electron shells. Electrons are considered "light" particles because they have a much smaller mass than protons and neutrons.
Specifically, electrons have a mass of approximately 9.1 x 10^-31 kilograms, which is about 1/1836th the mass of a proton or neutron. This small mass makes electrons highly mobile and allows them to be involved in chemical reactions and electrical conductivity.
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