Answer:
Scientists classify stars based on three main characteristics: main sequence, spectrum, and light year. The main sequence of a star refers to its position on the Hertzsprung-Russell diagram, which plots the luminosity of a star against its surface temperature. Stars that fall on the main sequence are considered to be "normal" stars and are burning hydrogen in their core to produce helium. The spectrum of a star refers to the light it emits, which can be analyzed to determine its composition, temperature, and motion. Stars are classified based on their spectra into different spectral types, such as O, B, A, F, G, K, and M. Lastly, the light year is a unit of measurement used to express astronomical distances and is equal to the distance that light can travel in one year, which is about 5.88 trillion miles (9.46 trillion kilometers). Using these three characteristics scientists can classify stars into different groups and understand the properties of the star and its evolutionary stage.
Explanation:
Scientists use various characteristics to classify stars and understand their properties and evolutionary stage. One of the main characteristics used is the main sequence of a star, which refers to its position on the Hertzsprung-Russell diagram. This diagram plots the luminosity of a star against its surface temperature, and stars that fall on the main sequence are considered to be "normal" stars that are burning hydrogen in their core to produce helium.
Another characteristic used to classify stars is the spectrum of a star, which refers to the light it emits. By analyzing the spectrum of a star, scientists can determine its composition, temperature, and motion. Based on the spectral features, stars are classified into different spectral types, such as O, B, A, F, G, K, and M. Each spectral type has unique characteristics, such as temperature, luminosity and chemical composition.
Lastly, scientists use the light year as a unit of measurement to express astronomical distances. A light year is the distance that light can travel in one year, which is about 5.88 trillion miles (9.46 trillion kilometres). This unit is useful for understanding the distance between stars and galaxies, as well as the relative ages of different stars.
By using these three characteristics, scientists can classify stars into different groups, understand their properties, and deduce information about the star's evolutionary stage. This knowledge can help scientists understand the formation and evolution of stars and galaxies, as well as the universe as a whole.
What is angular momentum called?.
The rotational equivalent of linear momentum, angular momentum, is also known as Rotational Momentum or Moment of Momentum.
What is angular momentum?Angular momentum is the rotational equivalent of linear momentum in physics. It is an important physical quantity because it is a conserved quantity—in a closed system, the total angular momentum remains constant. Both the direction and magnitude of angular momentum are conserved. The property of any rotating object given by moment of inertia times angular velocity is defined as angular momentum. It is the property of a rotating body determined by the product of the rotating object's moment of inertia and angular velocity. Angular Momentum is defined as the property of any rotating object given by the product of the rotating object's moment of inertia and angular velocity. It is a vector with both magnitude and direction.
Here,
Angular momentum, which is the rotational equivalent of linear momentum, is also known as Rotational Momentum or Moment of Momentum.
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Find the modulation index of an AM wave having 8V variation where maximum amplitude of the AM wave i 9V
Correct option is (A) 0.8
What is Modulation Index ?
-- Modulation index is defined as the ratio of the amplitude of the modulating wave to that of the carrier wave
- Modulation index: m = Am / Ac
: Given 2Am = 8 Am + Ac = 9
⇒ Ac = 5
∴ m = 4/5 = 0.8.
What is Electromagnetic Wave ?
-'Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
-- In other words, EM waves are composed of oscillating magnetic and electric fields.
What is Magnetic Field?
-- A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.
--A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.
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a hollow metallic sphere of radius 10 cm is given a charge of 3.2 * 10 ( to power -9 ) C. what is the electric intensity at a point 4 cm from the center
The electric intensity at a point 4 cm from the center is 2,880 N/C.
What is the electric intensity of the charge?
The electric field intensity of the charge is calculated by applying the following formula as show below.
E = F / q
E = ( kq ) / ( r² )
where;
K is the coulomb's constantq is the magnitude of the charger is the distance of the chargeThe electric intensity at a point 4 cm from the center is calculated as;
E = ( 9 x 10⁹ x 3.2 x 10⁻⁹ ) / ( 0.1² )
E = 2,880 N/C
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Is there an equal and opposite reaction for every action?
Answer: Yes it is true according o newton third law of motion
What is Newton Third Law of motion ?
--According to Newton's third law of motion, every action has an equal and opposite reaction.
--These two forces act on two different bodies.
-- Example,
1- while swimming, you push the water backward. The water, in turn, pushes you forward.
--Similarly, while walking, you push the ground backward.
-- The ground then exerts a reaction force on you in the forward direction.
What is Newton Second Law of motion ?
--Newton's second law of motion states that “Force is equal to the rate of change of momentum.
--For a constant mass, force equals mass times acceleration.
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What are the 4 steps to solving any physics problem?.
An object of mass 178 kg moves in a smooth
straight tunnel of length 2640 km dug through
a chord of a planet of mass 4.48 x 1024 kg and
radius 8.26 x 106 m.
y
F/m
Find the effective force constant of the har-
monic motion.
The value of gravitational
constant is 6.67259 x 10-¹1 Nm²/kg².
Answer in units of N/m.
Answer: If the mass of the object is 178 kg: k = 9.44*10^-5 N/m
Answer for the mass being 82 kg is not complete, because G was not given.
Explanation:
If the mass of the object is 178 kg:
The mass of object (m) = 178 kg
Length of tunnel (l) = 2640 km
***The minimum displacement (its amplitude) of object from its mean position,
A = 2640/2 = 1320 km = 1.320 * 10^6 m
Mass of planet (M) = 4.48 * 10^24 kg
Its Radius (R) = 8.26 * 10^6 m
Gravitational constant (G) = 6.67259 * 10^-11 Nm^2/kg^2
Now, restoring force for given hormonic motion will be
Vector of F = -((GMm)/R^3) * x
Comparing with, vector of F = -k*x, we get
k = (GMm)/R^3
k = (((6.67259*10^-11)*(4.48*10^24)*178)/(8.26*10^6)^3)
k = ((5320.99017*10^(-11+24))/(563.559976*10^18))
k = 9.44*10^(13-18)
k = 9.44*10^-5 N/m
If the mass of the object is 82 kg:
The mass of object (m) = 82 kg
Length of tunnel (l) = 2430 km
***The minimum displacement (its amplitude) of object from its mean position,
A = 2430/2 = 1215 km = 1.215*10^6 m
Mass of planet (M) = 4.16 * 10^24 kg
Its Radius (R) = 7 * 10^6 m
Gravitational constant (G) not given in the photo
Now, restoring force for given hormonic motion will be
Vector of F = -((GMm)/R^3) * x
Comparing with, vector of F = -k*x, we get
k = (GMm)/R^3
k = ((G*(4.16*10^24)*82)/(7*10^6)^3)
Remember that when multiplying two values with exponents, you add the exponents together!
k = ((3.4112*10^26 * G)/(3.43*10^20))
Insert G to solve!
the plates of a parallel-plate capacitor are connected to a battery. if the distance between the plates is halved, the energy of the capacitora. a. Increases by a factor of 4b. Doublesc. Remains the samed. Is halvede. Decreases by a factor of 4
Cantilever beam capacitance at time t, expressed as C= U's rate of change is therefore inversely proportional to x 2.
What are capacitance and its measure?Date Updated: 27 June 2022. (00 : 00) Solution: A capacitor's capacitance is determined by dividing the amount of charge on either of its conductor plates by the potential difference between its conductors.
QpropV or C=(Q)/(V). The coulomb per volt and farad is the SI unit for capacitance (F).
The formula for capacitors is what?The fundamental equation for capacitors is charge (= capacitance x voltage, or Q = C x V. We gauge capacitance by series or in parallel, which is the capacity that holds one coulomb (specified as the charge delivered by one ampere inside one minute) of charge per one farad.
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Can torque be measured by right hand rule?.
Yes, torque can be measured by right hand rule. Turn your right hand in the direction of the position vector, your fingers in the direction of the force, and your thumb in the direction of the torque to apply the right-hand rule to torque-related problems.
Using the right-hand rule, the torque vector's direction is determined: Point the fingers of your right hand towards the direction of the force application point, beginning at the point of rotation. Curl your fingers in the force-direction, vector's and then extend your thumb from your hand.
The torque vector's path is established using the right-hand grip rule. If a hand is wrapped around the plane, the torque vector will point in the plane of the thumb.
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How do you find the molar mass of an unknown compound?.
The molar mass of a compound can be found by adding the molar masses of all of the atoms in the compound.
The molar mass of an atom can be found on the periodic table by looking at the atomic mass listed for that element.
For example, to find the molar mass of water (H2O), we would add the molar masses of two hydrogen atoms (2 x 1.01 g/mol) and one oxygen atom (16.00 g/mol) to get a total molar mass of 18.02 g/mol.
Another way is by finding the molecular formula of the compound, it can be done by analyzing the compound's chemical and physical properties and then using the mass spectrometer to determine the molecular weight.
In conclusion, the molar mass of a compound can be found by adding the molar masses of the atoms in the compound using the atomic masses listed on the periodic table, or by determining the molecular formula of the compound and using a mass spectrometer to find the molecular weight.
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A flat piece of paper has a mass of 5 grams. When the paper is crumpled into a ball, the mass of the crumpled paper is
answer choices
O much more than the flat
O slightly more than the flat
O the same as the flat
A flat piece of paper has a mass of 5 grams. When the paper is crumpled into a ball, the mass of the crumpled paper is D) the same as the flat paper.
Definition of MassMass was first discovered by Sir Isaac Newton through research on the gravitational and inertial properties of objects he developed. Newton was an English physicist, mathematician, chemist, astronomer, natural philosopher, and theologian.
Mass can be interpreted as a measure of the number of particles contained in a substance or object. Mass is also one of the principal quantities that shows the size of the inertia of an object.
Mass becomes an intrinsic property of an object, so that wherever the object is, the mass value will remain the same. If it is based on the effect of the object on the direction of motion, mass is classified as a scalar quantity (only has value).
Mass has units in the International System , namely kilograms (kg). These units can be further reduced to grams (g), or milligrams (mg). Generally, mass is measured using a balance, for example a three-arm O'hauss balance, a digital balance, and a two-arm analytical balance.
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Is Newton's third law always true?.
Newton's third law does not hold always true.
Newton's third law, also known as the law of action and reaction, states that for every action force, there is an equal and opposite reaction force. This means that if object A exerts a force on object B, object B will exert an equal and opposite force on object A.
This is often demonstrated with examples such as a person pushing a wall or a rocket being propelled forward by the force of its exhaust.
One exception to this law is when forces such as friction and air resistance act on an object. These forces are not equal and opposite to the action force and can cause the reaction force to be less than the action force.
Another exception is when Newton's laws are applied in the realm of quantum mechanics, the laws of classical mechanics such as Newton's laws, no longer hold true.
In the quantum world, particles don't have definite positions or velocities, and they can exist in multiple places at once. As a result, the laws of classical mechanics do not apply to the quantum world.
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What is the SI unit of specific resistance Mcq?.
Specific Resistance is a property of any conductive material, a figure used to calculate a conductor's end-to-end resistance. The specific resistance of materials is given in units of Ω-cmil/ft or Ω-meters (metric).
What is specific resistance?The electrical resistivity of a material is a fundamental property that measures how strongly it resists electric current. A material with a low resistivity allows electric current to flow easily. The Greek letter is commonly used to represent resistivity. The ohm-meter is the SI unit of electrical resistivity. When a known amount of voltage is applied, specific resistance is defined as the resistance offered per unit length and unit cross-sectional area. The following is the mathematical representation: ρ = R A L. Specific resistance is also referred to as resistance. A material's resistivity is defined as the resistance of a wire of that material with unit length and unit area of cross-section. Its SI unit is the ohm-metre.
Here,
Specific Resistance is a property of any conductive material, a figure used to determine a conductor's end-to-end resistance. Specific resistance for materials is measured in Ω-cmil/ft or Ω-meters (metric).
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Describe the force exerted by a magnet
The force that a magnet exerts on certain materials, including other magnets, is called magnetic force.
Where is the magnetic force exerted?A force that is applied to an item by a person or another object is known as an applied force. A desk is being subjected to applied force if someone is moving it across the room. The person's force applied to the desk is known as the applied force.Magnetic force is the force that a magnet applies to specific materials, such as other magnets. The force, which consists of both attractive and repulsive forces, is applied over a distance. Two magnets' north and south poles are attracted to one another whereas two north poles or two south poles are repellent to one another.Learn more about Magnetic force refer to ;
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What is the main difference between torque and force?.
Answer:
Torque is a measure of the force that can cause an object to rotate about an axis. Force is what causes an object to accelerate in linear kinematics, torque is what causes an object to acquire angular acceleration.
How do you find the maximum gravitational force between two objects?.
The maximum gravitational force between two objects can be found by the given formula:
Gravitational force= (Gravitational constant X Mass of the first object x Mass of the second object) / (Distance between the centre of two bodies)².
In Physics, the gravitational force is one of the types of forces that attracts any two objects with mass. The other name of gravitational force is an attractive force as it pulls the two objects towards each other.
Newton's law of gravitation states that every object that exists in our universe is pulled by other objects. the other type of forces are the electromagnetic force, weak force, strong force etc.
The gravitational force on earth is maximum at the poles as the earth is an oblate spheroid, and that means it bulges out in the middle (the equator). This means that the poles of the earth ends up a little closer to the center of gravity as compared to other positions.
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what is the loudest sound ever recorded and what was its specific measurement?
The loudest sound ever recorded was the Krakatia volcano eruption and its specific measurement is 194dB.
The loudest sound ever recorded was due to a volcanic eruption that occurred on an Indonesian island named Krakatoa. The eruption occurred on 27th August 1883. The explosion led to a tsunami with waves as high as 46m thereby causing almost two-thirds of the island to collapse. The height of the waves was so high that they could rock the ships as far as South Africa. At a sound as high as 194 dB, a complete vacuum is created as the energy in the waves of sound starts distorting. At this position the sound waves while moving start pushing the air rather than moving through the air. This pushing away of the air leads to formation of the pressurized wall of moving air.
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What is the formula of total weight?.
How long will it take a peron on a kateboard to travel 45 m and attain a peed of 7 m/ from ret ?
Here, a denotes acceleration, t denotes time, and u and v denote beginning and ultimate velocities, respectively. u = v + at.
Can you use a skateboard to travel?In carry-on luggage, skateboards are permitted. If there are any size or weight limits, please check with your airline additional forbidden itemsSkateboards that fit under seats do not need to be under bags or covers, but they must be stored with their wheels up to prevent rolling. A skateboard must be packed in a bag or have the wheels covered if it is to be stored in an overhead container (trash bag is acceptable).As the skateboarder comes to a stop, his final velocity will be zero. To calculate the value of time, replace the necessary values (t).0 m/s = 45 m/s + 7 m/s t t = 6.42 s.
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What is momentum Class 9 very short answer?.
Momentum is characterised as the intensity of a body's motion. The formula is "mass times velocity."
As momentum depends on velocity, it also depends on the body's direction of motion. Since velocity is a vector and mass is a scalar, momentum is a vector quantity.
Mass times speed equals momentum.
Momentum can be viewed as a body's "power" while it is moving, or the amount of force it can exert on another body. For instance, a baseball that is thrown quickly and with a tiny mass could have the same momentum as a bowling ball with a heavy mass travelling very slowly.
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2) Does Michael Phelps tend to have an increase or decrease in speed between the 100m and
200m laps? Why do you think this is the case?
Michael Phelps' had a net worth of 100 million dollar in 2022. Phelps is a retired Olympic swimmer and corporate advocate.
What is swimmer?Swimmers show immense commitment, calmness, courage, humility, responsibility, integrity. After setting aside a few swimmers, it was interesting to see how they felt about how these qualities contributed to their training and overall performance. It's a big part of being a player. This may be a narrow view, but in the simplest terms there are 3 types of swimmers. A sense of the season. Talent of taper; and eternally fast phenomenon. Essential swimming skills include the ability to enter and exit water, control breathing, float, turn, and enter and exit water safely. However, the water environment, activity, and even what you're wearing can change your ability to perform these skills.To learn more about swimmer from the given link:
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On which does mass depend?.
While an object's weight is affected by gravity, its mass is not.
A thing's mass is the total amount of its constituent parts. Mass is a scalar quantity with a single value and no directionality.
mg = mass (N).
Gravity causes variations in acceleration that cause an object's weight to vary from one place in space to another. Weight is a vector quantity, hence it has a magnitude and a direction. As a result, weight depends on gravitational pull.
This leads us to the conclusion that while an object's mass is not affected by gravity, its weight is.
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What are the 3 types of collisions?.
Collisions are classified into three types: Collision with perfect elasticity, Collision that is inelastic, Collision with perfect inelasticity.
What is collision?A collision is defined in physics as any event in which two or more bodies exert forces on each other in a relatively short period of time. In physics, a collision is the sudden, forceful coming together of two bodies, such as two billiard balls, a golf club and a ball, a hammer and a nail head, two railroad cars when coupled together, or a falling object and a floor. When two bodies come into direct contact with each other, this is referred to as a collision. The two bodies exert forces on each other in this case in a short period of time. As a result of the collision, the energy and momentum of the bodies interacting change.
Here,
Collisions are classified into three types: Collision with perfect elasticity, Collision that is inelastic, Collision with perfect inelasticity.
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What is the SI unit of linear momentum Mcq?.
The SI unit representing momentum is kilograms per second. Strength or force acquired by motion or a sequence of occurrences
In real life, what does momentum mean?Mass in motion is a definition of momentum. All things have mass, thus if something is moving, it must have momentum because its mass is in motion. How much material is going and how quickly it is moving are the two factors that determine how much momentum an object has.
What does the word momentum mean?Increasing forward motion is often referred to as momentum. The speed of a boulder riding down a hill increases. The economy, a successful team, or a wonderful concept all have positive effects. You must multiply the mass by the velocity of an object to determine its physical momentum.
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2. What is the kinetic energy of a car with a mass of 1050 kg and a velocity of 5 m/s?
The kinetic energy of a car with a mass of 1050kg and a velocity of 5m/s will be 13,125 joules or 13,125 kg⋅m2⋅s−2.
As we know, the formula to find the kinetic energy in a system is [tex]1/2 m v^{2}[/tex] where m is the mass of the system and v is the given velocity at the moment. So , by putting the given data in the equation, we get :
⇒[tex]1/2mv^{2}[/tex]
⇒1/2 x 1050 x 5 x 5
⇒525 x 25
⇒13,125
∴ The Kinetic energy of the car will be 13,125 Joules where joule is the SI unit of energy.
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What is the net charge on a sphere that has the following?
a) 5.29 x 10^6 electrons and 7.07 x 10^6 protons
b) 225 electrons and 115 protons
c) 6.13 x 10^6 electrons and 7.33 x 10^6 protons d) 215 electrons and 109 protons
Lectron and proton charges are of the same magnitude. ... Section 23.4: The Electric Field [fy 8.22 x 10 8 N (0.529 x 10 10 m) v 9.11 x 10 31 kilogram 2.19 xlO 6 m/s.
How does an electron carry charge?The mass of an electron is roughly 1/2000 that of a neutron or proton, and it has an electrical charges of 1. The letter e is typically used to represent electron charge. It is a basic physical fundamental that is used to represent the 1.602 10-19 coulomb, which is the unit of naturally occurring electric charge.
What is Positivity of protons ?A atom with a negatively charged is an electron. A subatomic particle having a positive charge is called a proton. As a result, protons are linked together in the nucleus of an atom.the powerful nuclear force. A type of single atom called a neutron has no charge; it is neutral.
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A restaurant plans to use a new food delivery service. The food delivery service charges $4. 98 for every 2 meals delivered, plus a $2. 00 service fee. What is the slope of this situation?.
The slope of this situation is $2.00. This is because the cost of the delivery service increases by $2.00 for each 2 meals delivered. Therefore, the slope is $2.00 ($2.00/$2.00).
What is the increases ?The term "increase" can refer to a variety of different concepts. Generally, it is defined as an increase in size, amount, number, or intensity. In the business world, an increase could refer to a rise in profits or revenue, a rise in stock prices, an increase in the number of employees, an increase in the amount of production, or an increase in the cost of goods or services. In the context of personal finance, an increase could refer to an increase in wages or an increase in the value of investments.
The slope of this situation is $2.00. This is because the cost of the delivery service increases by $2.00 for each 2 meals delivered.
Mathematically, the slope is calculated as the change in cost divided by the change in meals delivered. In this situation, the change in cost is $2.00 and the change in meals delivered is 2.
Therefore, the slope is $2.00 ($2.00/$2.00).
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The slope in this situation is 2.49$.
The slope of a situation refers to change in the dependent variable as a result of a unit charge in the independent variable.The independent variable in this situation is the number of meals delivered so the slope will be the amount that the food delivery service charges for every meal that they deliver.Slope is a value that describes the steepness and direction of a line. In variable format, it is commonly represented by the letter m. The slope of a line is also called its gradient or rate of change. The slope formula is the vertical change in y divided by the horizontal change in x, sometimes called rise over run.The amount is 4.98/2 meals delivered.
i.e. amount is 2.49$.
So, the slope in this situation is 2.49$.
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What is the G stand for in Newton's universal gravitational formula?.
Newton included a constant known as the universal gravitational constant since we always need to introduce one to remove "G" proportionality.
Every particle in the cosmos is drawn to every other particle by a force that is directly proportional to the product of their masses and inversely proportional to the square of their separation, according to Newton's Law of Universal Gravitation.
F∝ Mm / r^2.
The gravitational constant, which is a proportionality constant, is what Newton utilized to derive his law of gravitation. The universal gravitational constant (UGC) is the force of attraction between any two unit masses separated by a unit distance.
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Part of the visual field that surrounds the figure, called?
The part of the visual field that surrounds the figure is called linear.
Linear perspective is a visual cue that allows a viewer to discern the depth and range of an object. Field of vision of a person's eye is that portion in the space in which object is visible to the viewer. The most clear vision subtend a central angle of 3° on the eye. However the monocular visual area consists of central vision, which includes the inner 30 degrees angle of vision and central fixation, and the surrounding visual field, which expand 100 degrees laterally. A vertical line bisects central vision and divides the visual field. The blind spot is represented on a visual field chart by a partial alteration in the field of vision.
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What is Newton's 2nd law called?.
Newton's second law, also known as the law of acceleration or the force law, states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass.
It means that the force applied to an object is equal to the product of its mass and acceleration.
In simple terms, it says that the more force applied to an object, the greater its acceleration will be, and the more massive an object is, the less it will accelerate for a given force.
This law is used to calculate the motion of objects under the influence of forces and is important in explaining the behavior of objects in motion. It can be represented mathematically as F = ma, where F is the net force acting on an object, m is the mass of the object and a is its acceleration.
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a physics demo launches a ball horizontally while dropping a second ball vertically at exactly the same time.
if two balls are launched from a height. One is horizontally and other is vertically downwards, then both of the balls will touch the ground exactly at the same time.
When a ball is launched from a height than at some angle then its velocity(v) can be considered as divided into two components: One is vertical and the other is horizontal.
v₁ = vcosθ (horizontal component)
v₂ = vsinθ (vertical component)
Vertical component is always subjected to the acceleration due to gravity. Which is same for every vertical motion. Since the dropping height is same for both the balls, so their travelling time in the vertical downward direction will also be same. So they will touch the ground exactly at the same time.
--The given question is incomplete, the complete question is
"A physical demo launches a ball horizontally while dropping a second ball vertically at exactly same time from same height. Which ball will touch the ground first?"--
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