A force of 45 newtons is applied on an object, moving it 12 meters away in the same direction as the force. What is the magnitude of work done on the object by this force? Part A: Enter the variable symbol for the quantity you need to find. Use your keyboard and the keypad to enter your answer. Then click Done.

Answer:

A. Lever

Explanation:

A  Lever is the kind of simple machine is the shin bone in your leg.

Hope this helps!

Feel free to ask if you have anymore questions!

The shin bone in your leg, also known as the tibia, acts like a lever in the context of simple machines. It helps create movement, with muscles providing the force, and joints serving as fulcrums.

The shin bone in your leg, also known as the tibia, is similar to a lever in the context of simple machines. In our bodies, bones, muscles, and joints work together to create movement. Muscles exert force, bones act as levers, and joints act as fulcrums. For instance, when you kick a ball, your shin bone acts as the lever; the joint at your knee serves as the fulcrum; and the muscles in your thigh and calf provide the force.

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Answer:

These are called isotopes.

Explanation:

Please mark brainliest and have a great day!

Explanation:

The acceleration due gravity (free-fall acceleration) [tex]g=[/tex] of a body is given by the following formula:

[tex]g=\frac{GM}{r^{2}}[/tex]   (1)

Where:

[tex]G=6.674(10)^{-11}\frac{m^{3}}{kgs^{2}}[/tex] is the gravitational constant

[tex]M[/tex] the mass of the body (the moon in this case)

[tex]r[/tex] is the distance from the center of mass of the body to its surface. Assuming the moon is a sphere with a diameter [tex]d=3500km[/tex], its radius is [tex]r=\frac{d}{2}=1750km=1750(10)^{3}m [/tex]

If the value of [tex]g[/tex] is given: [tex]g=1.60m/s^{2}[/tex] we can find the mass of the moon with equation (1):

[tex]M=\frac{gr^{2}}{G}[/tex]   (2)

[tex]M=\frac{(1.60m/s^{2})(1750(10)^{3}m)^{2}}{6.674(10)^{-11}\frac{m^{3}}{kgs^{2}}}[/tex]   (3)

[tex]M=7.34(10)^{22}kg[/tex]   (4)

Now, according to the 3rd Kepler's Law, there is a relation between the orbital period [tex]T[/tex] of a body (the spacecraft in this case) orbiting a greater body (the moon) in space with the size [tex]r[/tex] of its orbit.

[tex]T^{2}=\frac{4\pi^{2}}{GM}r^{3}[/tex]    (5)

Substituting the known values and the calculated mass of the moon in (6), we can find the period of the orbit of the spacecraft around the moon:

[tex]T=\sqrt{\frac{4\pi^{2}}{GM}r^{3}}[/tex]    (6)

[tex]T=\sqrt{\frac{4\pi^{2}}{(6.674(10)^{-11}\frac{m^{3}}{kgs^{2}})(7.34(10)^{22}kg)}(1750(10)^{3}m)^{3}}[/tex]   (7)

Finally:

[tex]T=6571.37619s=109.522 min[/tex]  

Given the moon's diameter and the acceleration due to gravity at its surface, a spacecraft in low, circular orbits roughly 115.2 minutes to complete one orbit, using the equations of circular motion.

To calculate the time it takes for the spacecraft to complete one orbit, you need to know the speed of the craft, which is determined by the gravitational force between the Moon and the spacecraft. This force creates the centripetal acceleration that keeps the spacecraft in its circular orbit.

The formula to calculate the speed (v) in a circular orbit is v =  √(g*r), where g is the acceleration due to gravity (1.6 m/s^2) and r is the radius of the orbit. Because the spacecraft is very close to the lunar surface, the radius is approximately the radius of the moon, which is 1.75 x 10^6 m (half the diameter).

Then, the orbital period (time for one complete orbit) can be calculated using the formula T = 2πr/v. Substituting known values and calculating, it takes approximately 1.92 hours, or 115.2 minutes, for the spacecraft to complete one orbit.

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Answer:

Much of the caloric intake is used to maintain normal body functioning -- heart rate, respiration, muscle contraction, etc..  Therefore, only some of the calories are actually stored as fuel for later use.

Explanation:

In the question, there is a comment to indicate that 2,000 of low-carbohydrate food will not cause weight gain.  This is not exactly accurate.  Weight gain depends upon what is taken in (calories in food) and what is expended (calories in activity).

There has to be moderation in what is consumed.  Consuming all fats or all carbs is not the answer.  Yes, fat has more calories per gram (9) than does carbohydrates (4.5), but it should be noted that if you take in too many calories in carbs, they will be converted and stored as fat.

Answer:

I think it is C

Explanation:

I think C because it is the one. I might be wrong but I helped and your welcome if you thanking me.

Answer:

Figure C

Explanation:

Here different figure represents different situations

Figure A

it represents the situation of reflection of light in which light bounce back into the same medium after reflecting by a surface

Figure B

It show refraction of light in which light will bend from its path when light travels from one medium to other medium

Figure C)

here we can see that a plane wavefront incident on the small opening and after that it converts into spherical wavefront. So when light passes through a small opening then it gets diverge at the corners of the opening which is known as diffraction

Figure D

it is just the incident of light ray which get completely absorbed by the medium.

(a) [tex]4.7\cdot 10^9 J[/tex]

The kinetic energy of an object is given by

[tex]K=\frac{1}{2}mv^2[/tex]

where

m is the mass of the object

v is its speed

For the ship in this problem,

[tex]m=7.00 \cdot 10^7 kg[/tex] is the mass

[tex]v = 11.6 m/s [/tex] is the speed

Substituting,

[tex]K=\frac{1}{2}(7.00 \cdot 10^7 kg)(11.6 m/s)^2=4.7\cdot 10^9 J[/tex]

(b) [tex]-4.7\cdot 10^9 J[/tex]

The work done on the ship is equal to the change in kinetic energy of the ship; so we have:

[tex]W = K_f - K_i[/tex]

where

W is the work done

Kf is the final kinetic energy of the ship, which is zero since it comes to rest

Ki is the initial kinetic energy of the ship, which is [tex]4.7\cdot 10^9 J[/tex]

Substituting into the formula,

[tex]W=0-4.7\cdot 10^9 J=-4.7\cdot 10^9 J[/tex]

and the sign is negative because the force used to stop the ship acts against the direction of motion of the ship, in order to slow it down.

(c) [tex]1.57\cdot 10^6 N[/tex]

The work done by the force applied to stop the ship is

W = Fd

where

W=-4.7\cdot 10^9 J is the work done

F is the force applied

d = 3.00 km = 3000 m is the displacement of the ship

Solving the equation for F, we find the force:

[tex]F=\frac{W}{d}=\frac{-4.7\cdot 10^9 J}{3000 m}=-1.57\cdot 10^6 N[/tex]

and ignoring the negative sign, the magnitude of the force is

[tex]1.57\cdot 10^6 N[/tex]

Answer:

Work is equal to the change in kinetic energy.

Explanation:

Since energy cannot be created nor destroyed, and work is a form of energy, the work done by a force acting on an object must be equal to the kinetic energy gained by the object.

This is summarized by the work-energy theorem, which can be written as:

[tex]W=\Delta K = K_f - K_i = \frac{1}{2}mv^2 - \frac{1}{2}mu^2[/tex]

where

W is the work done on the object

m is the mass of the object

v is the final speed of the object

u is the initial speed of the object

Final answer:

The work done by a force on a body is equal to the change in that body's kinetic energy, according to the work-energy theorem.

Explanation:

In a system where only a single force is acting upon a body, the work done by that force is equal to the change in kinetic energy of the body. This is known as the work-energy theorem, which can be mathematically expressed as the total work done on the system being equal to the change in kinetic energy. If the force is in the direction of the motion, the work done on an object increases its kinetic energy. However, if the force is opposite the direction of motion, it does negative work, and the kinetic energy decreases. No other forms of energy, such as potential energy, are taken into account in this particular relationship.

Explanation:

Sound waves (mechanical waves) and infrared waves (electromagnetic waves), both can transfer energy through matter. However, there is a huge diference between them:

Mechanical waves only propagate through matter and can not propagate in vacuum. This means, they necessarily need a medium to propagate.

On the other hand, electromagnetic waves can propagate  through matter and in vacuum, too. This means their propagation does not depend on the existence of a medium.

Since it's a transverse wave, a particle on the string moves left and right as the wave passes by, but the particle doesn't travel forward or backward at all.

So the little red dot moves 'A' to the left, then 'A' back to the center, then 'A' to the right, then 'A' back to the center again.

All together, the red dot moves a total distance of 4A . (choice 'a')

The total distance traveled by the red spot in one cycle is equal to 2A. Therefore, option (e) is correct.

Transverse waves are described as waves the displacement of the particle is perpendicular to the direction of propagation of the wave. Examples of transverse waves involve ripples on the surface of the water, secondary waves of an earthquake, waves on a string, human waves, ocean waves, and Electromagnetic waves.

A longitudinal wave can be defined as the displacement of the particle parallel to the direction of the propagation. Sound waves in the air, primary waves of an earthquake are longitudinal waves.

A transverse wave of the particle of the medium traveling around its mean position in a direction that is the opposite of the propagating direction. Transverse waves are produced only on the surface of liquids and solids.

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Physical weathering refers to the process of rocks breaking down due to external conditions like temperature and water, without their chemical composition being altered. Examples include temperature changes causing cracks in rocks, and water freezing in rock cracks leading to their breakage.

Physical weathering, also known as mechanical weathering, is a concept in geography that describes the process of rocks breaking down into smaller pieces due to external conditions, without any change in their chemical composition. This occurs primarily due to temperature changes, water, wind, and biological activity.

For example, in the case of temperature changes, the rock can expand and contract causing it to crack and eventually break apart. This is often seen in desert environments where there is a large temperature difference between day and night. Similarly, water, when it gets into the cracks of the rock and freezes, expands, causing the rock to break apart. This process is known as freeze-thaw weathering and is commonly found in cold climates.

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Physical weathering is the process of breaking down rocks into smaller pieces by physical forces like temperature changes and erosion, without any change in the rock's chemical composition. Factors like climate and biotic activity can significantly influence the rate and extent of physical weathering.

Physical weathering, also known as mechanical weathering, is a geological process where rock is broken down into smaller pieces by mechanical means, without any change in the chemical composition of the rock. This can occur through a variety of processes, including temperature changes, wind, water erosion, and biological activity. An example of physical weathering could be the process by which a mountain range is eroded by water and ice: the rocks are not chemically altered, but they are gradually worn down into smaller pieces due to the abrasive action of the moving water and ice.

Another important factor in physical weathering is the climate. Higher temperatures cause rocks to expand, and cooler temperatures cause them to contract. This expansion and contraction can cause stress in the rock that leads to cracking and breaking. Also, in areas of high moisture, water can seep into cracks in rocks and freeze, causing the cracks to widen and the rock to break.

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Answer:

Copper

Explanation:

Copper is the most popular material used for wires because it is a quality conductor of electrical current

Answer:

J. Robert Oppenheimer

Explanation:

He led the Manhattan project and created the first nuclear bomb in WWII

Final answer:

J. Robert Oppenheimer is considered the 'father of the atomic bomb' for his leadership of the Manhattan Project, which developed the first nuclear weapons during World War II.

Explanation:

The scientist often called the “father of the atomic bomb” is J. Robert Oppenheimer because of his pivotal role as the head of the Manhattan Project. Oppenheimer was a leading theoretical physicist who, after seeing the power of the bomb, opposed the subsequent nuclear arms race. The Manhattan Project was a top-secret research and development project during World War II that produced the first nuclear weapons. Employing over 100,000 people, this project led to the successful detonation of the world's first atomic explosion in July 1945. Despite his involvement in the development of nuclear weapons, Oppenheimer had complicated feelings about their use and later became a proponent of controlling nuclear arms.

The decision to drop the atomic bomb was influenced by various complex factors, including the desire to bring a swift end to World War II and the fear that Nazi Germany might develop a bomb first, spurred by alarmed messages from scientists like Albert Einstein and Leo Szilard to President Roosevelt.

Answer:

It's called the working distance .

The distance from the bottom of the objective lens to the surface of the slide is called the working distance, which decreases with higher magnification and requires careful focusing.

The working distance is the length of time between the objective lens's bottom and the slide's surface. This distance is critical in microscopy as it can affect the focus and resolution of the image being observed.

In general, as you increase the magnification by switching to a higher power objective lens, the working distance decreases. This means that there is less space between the objective lens and the specimen, resulting in a closer and more magnified view of the specimen.

However, a higher magnification also increases the risk of bringing the lens too close to the specimen, potentially damaging both the specimen and the lens if not handled carefully.

Therefore, when using high magnification, only minor adjustments should be made using the fine focus knob to avoid collision between the lens and the slide.

Answer:

The correct answer will be option-B.

Explanation:

Science is a systematic approach to understand and explain the natural phenomenon occurring in an area.

The explanation of any phenomenon or process taking place can be approached through following scientific methods which include: asking a scientific question based on predictions, background research and formation of hypothesis which can be tested through experiments and observations.

In the given question, predicting the atmospheric weather after looking at the clouds in the sky is the situation where scientific methods can be applied as the situation starts with the observation and prediction of the atmosphere which could lead to the generation of a scientific question.

Thus, Option-B is the correct answer.

Answer:

4. has a symmetrical charge distribution

Explanation:

Symmetrical charge distribution in molecules results in the formation non-polar molecules.

For a symmetrical distribution of charge to occur, there must be a sort of sharing of electrons between two atoms. In the case where electrons are transferred, there won't be any need to distribute charges.

When electrons are shared between atoms with similar likeness for the electron, none of the two atoms pulls the electrons more to itself. The electrons are shared evenly and symmetrically between the two atoms. This leaves no charge separation on any of the atom. Therefore, the dipoles in one direction cancels out the dipoles in another direction and this leaves no charge.

This makes the molecule non-polar.

Answer:

has a symmetrical charge distribution

Explanation:

A symmetrical charge distribution means the atoms have the same electronegativity or they are a molecule with the same atoms in a regular pattern around the center is in CH4, identical along a central line.

Convective heat transfer occurs only in fluids, through the movement of groups of molecules that make up the medium.

Being this molecular movement, related to the properties of the fluid that change with temperature.

This means that convection occurs when the hottest parts of a fluid ascend to the coldest zones, generating a continuous circulation of the fluid (better known as convective current) transmitting heat to the cold zones by decreasing the density caused by the increase in temperature.

Convection, a method of energy transfer, is predominantly restricted to fluids (liquids and gases), as it depends on particle movement and density changes that cause a circulatory motion, facilitating heat transfer.

Energy transfer by convection is primarily restricted to fluids, which includes both liquids and gases. This is due to the fact that convection relies on the movement of particles within a substance. More specifically, convection occurs when warmer, less dense parts of a fluid rise, displacing cooler, denser parts which sink. This creates a circular motion of fluid, known as a convective current, and allows for heat to be distributed throughout the whole fluid.

Examples of convection include a boiling pot of water where the hot water at the bottom rises to the top, or the warmth you feel when standing near a radiator. The warm air around the radiator rises and circulates around the room, spreading heat.

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The the flame test is used to identify some inorganic chemical elements, by means of the emission of light by the phenomenon of atomic excitation by the increase in temperature.

In this sense, when an atom is excited, it means that it has left its ground state (in which each electron occupies its place in its orbit, around the nucleus), when this happens some electron jumps out of the orbit it occupied in its fundamental state to an outer orbit, further away from the nucleus and then return to the ground state, emitting in the form of light the energy received.

To understand it better:

An excited electron is an unstable electron, and when passing from one orbit to another, it produces light of a specific wavelength (color) that depends on the amount of energy the electron loses.

This is how the color of the light emitted in the flame is related to a characteristic chemical element.

Answer:

Point A

Explanation:

The work done by stretching or compressing a spring is given by E=1/2kx²

The potential energy is numerically equal to the work done.

This means that the higher the bigger the value of the extension, x, the higher the energy contained.

In this scenario the modulus of x is considered.

Among the given values of x the modulus of -5 is the largest.

thus it gives the highest value of energy.

Answer:

12

Explanation:

(6 x 1) 2

It really doesn't matter how long it takes it to travel what distance.

You said the wave vibrates 60 times per second.  That right there is a pretty fair intuitive description of what "frequency" means.  

If it vibrates 60 times per second, then its frequency is 60 per second.

(The unit "per second" has a special name:  "Hertz", abbreviated "Hz" .)

Answer:

Zero

Explanation:

The work done by a force on an object is given by:

[tex]W = Fd cos \theta[/tex]

where

F is the magnitude of the force

d is the displacement of the object

[tex]\theta[/tex] is the angle between the direction of the force and the displacement

From the formula, we see that if the force and the displacement are perpendicular to each other, then the cosine term is zero, so the work done is zero.

In this problem, the force is the force of gravity, which pulls downward, while the displacement is horizontal (in the right direction): so, the force and the displacement are perpendicular to each other, and so the work done by gravity is zero.

The work done by gravity on an object moving horizontally is zero because the displacement is perpendicular to the direction of the gravity force.

The student wants to know the work done on an object by the force of gravity as it moves horizontally. The work done by a force on an object is the product of the force and the distance moved in the direction of the force. In this case, the object is moving horizontally, perpendicular to the direction of the force of gravity, which acts downwards.

Since work done is the product of force and displacement in the direction of the force, and here the displacement is perpendicular to the force of gravity (represented by the weight), the work done is zero. This is because the angle between the direction of the force and direction of displacement is 90 degrees, and the cosine of 90 degrees is zero, making the entire product of force and displacement zero.

This is in line with the concept that gravity does zero work when the displacement is horizontal. In essence, for a horizontal movement, no work is done by gravity.

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Answer:

It'll be, C.) equal in measure.

The law of reflection states that the angle of incidence and the angle of reflection are always C: equal in measure.

Incoming rays, normal rays, and reflected rays are all in the same plane. Changing the direction of the incident ray changes the angle of the plane. Again, the incident, normal, and reflected rays are all in the same plane.

Set of optics: When light hits a flat surface, it is reflected so that the angle of reflection is equal to the angle of incidence, placing incident, reflected, and vertical rays on the surface. ..

Law of light reflection (i) The incident rays, normals, and reflected rays are all in the same plane. (Ii) The angle of incidence is equal to the angle of reflection.

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Answer: [tex]3.524(10)^{22}N[/tex]

Explanation:

According to Newton's law of Gravitation, the force [tex]F[/tex] exerted between two bodies of masses [tex]m1[/tex] and [tex]m2[/tex]  and separated by a distance [tex]r[/tex]  is equal to the product of their masses and inversely proportional to the square of the distance:

[tex]F=G\frac{(m1)(m2)}{r^2}[/tex]   (1)

Where:

[tex]G[/tex] is the Gravitational Constant and its value is [tex]6.674(10)^{-11}\frac{m^{3}}{kgs^{2}}[/tex]  

[tex]m1=1.99(10)^{30}kg[/tex] is the mass of the Sun

[tex]m2=5.972(10)^{24}kg[/tex] is the mass of the Earth

[tex]r=1.50(10)^{11}m[/tex]  is the distance between the Sun and the Earth

Substituting the values in (1):

[tex]F=6.674(10)^{-11}\frac{m^{3}}{kgs^{2}}\frac{(1.99(10)^{30}kg)(5.972(10)^{24}kg)}{(1.50(10)^{11}m)^2}[/tex]   (2)

Finally:

[tex]F=3.524(10)^{22}N[/tex]   This is the gravitational force acting on the earth due to the sun

The magnitude of the gravitational force acting on Earth due to the Sun is about  3.52 x 10^22 newtons, governing the Earth's orbit and the dynamics of the solar system.

The magnitude of the gravitational force acting on the Earth due to the Sun is approximately 3.52 x 10^22 newtons. This colossal force arises from Newton's law of universal gravitation, which states that every mass attracts every other mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. In this case, the mass of the Sun, which is about 1.989 x 10^30 kilograms, exerts an immense gravitational pull on the Earth, situated at an average distance of approximately 93 million miles (or 150 million kilometers).

The gravitational force is responsible for keeping the Earth in orbit around the Sun and governing the motion of all celestial bodies in the solar system. It is a fundamental force of nature that shapes the dynamics of our universe.

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Cepheids variables are stars of variable luminosity (like a lighthouse), pulsing with specific periods. That is, these are stars that periodically change their brightness (from the perspective of an observer on Earth).

Then, by measuring this period of variation of brightness we can have a measure of the brightness of the star. And knowing this brightness, this can be compared with the star's apparent brightness in the sky to obtain a measure of the distance to the star; thus indicating the distance at which the star is in the Universe.

To understand it better and returning to the comparison with the lighthouse:

If we know how bright is the light of a lighthouse at a specific distance (two meters, for example) and we also know how that brightness changes with distance, as we move away from the lighthouse we will know how much its brightness has been reduced. In this way we can use this measure as a pattern to calculate the luminosity of the object as a function of distance.

Well, this is what Edwin Hubble did to measure the variable brightness of the star Cepheid V1, discovering that the nebula in which it was found was actually a galaxy (Andromeda galaxy), showing that there were more galaxies in the universe and that the Milky Way was not the only one.

Then Hubble continued progressively its measurements with Cepheid variables in more distant galaxies measuring their periods, managing to formulate the famous Hubble law, which would open the way to the knowledge that our universe is expanding.

Edwin Hubble used cepheid variables to measure the distance to faint 'nebulas', showing they were other galaxies. This led to our understanding of the expanding universe.

The scientist who used cepheid variables to measure the distance to faint 'nebulas' in our sky, ultimately determining that they were actually other galaxies, was Edwin Hubble. Hubble's work led to the understanding that the universe is constantly expanding. Cepheid variables are stars that pulse at a rate proportional to their intrinsic brightness, thus by observing the pulsation period of these variables, Hubble was able to determine their distance from Earth. This use of cepheid variables led to the revolutionary discovery of other galaxies beyond the Milky Way.

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Answer is :

repel or attract- B.

The "transit method" means doing very careful precise measurements as the planet passes in front of its star.  

It's too far away for us to see it directly, but when it "transits" the star, the brightness of the star decreases by a tiny tiny tiny bit, which we can measure.

If we can measure that dip with good enough precision, it tells us how much of the star's photosphere was blocked from our view when the planet temporarily got in the way.  From that, we can estimate the planet's size.

Answer:

the universe began at a single point and has been expanding since its formation

The statement best describes the big bang theory is the universe began at a single point and has been expanding since its formation. The correct option is D.

The big bang is the theory which explains that how the universe began. It says that the universe began with just a single point. It went on expanding and stretched to grow as large as possible. It is still now expanding.

The big bang consist of fully dark matter, interstellar gases or dust. The big bang is increasing just because in universe there is abundant of hydrogen and helium.

The radiations come from the big bang.  These rays are also called as cosmic wave. This big bang is still on it way of expanding more.

Thus, the statement best describes the big bang theory is the universe began at a single point and has been expanding since its formation.

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Answer:

D

Explanation:

A hypothesis is pretty much what you think something is, what you think the solution is, with the little information that you already have. this can go on to be tested

Final answer:

Correct answer is option D. A hypothesis is a testable proposed explanation for a phenomenon, capable of being supported or refuted by scientific experiments or observations.

Explanation:

Within the realm of science, a hypothesis is a suggested explanation for a phenomenon that is based on evidence and can be tested through observation and experimentation. The key aspect of a hypothesis is its ability to be supported or refuted by experimental data.

So, the correct statement that describes a hypothesis is that it is directly testable (D). Contrary to a hypothesis that cannot be tested, which would not be a scientific hypothesis, a valid hypothesis must allow for the design of experiments or observations that could potentially demonstrate it to be false.

Answer:

3.6 m/s

Explanation:

v² = v₀² + 2a(x - x₀)

v² = (1.8 m/s)² + 2 (0.50 m/s²) (10.0 m)

v = 3.6 m/s

Answer:

Final speed, v = 3.63 m/s

Explanation:

It is given that,

Initial speed of the player, u = 1.8 m/s

Acceleration of the player, [tex]a=0.5\ m/s^2[/tex]

Distance, s = 10 m

We need to find the final speed of the player. Let it is given by v. Using third equation of motion as :

[tex]v^2-u^2=2as[/tex]

[tex]v^2=2as+u^2[/tex]

[tex]v^2=2\times 0.5\times 10+(1.8)^2[/tex]

v = 3.63 m/s

So, the final speed of the player is 3.63 m/s. Hence, this is the required solution.

Answer:

radiation

Explanation:

Answer:

C.Radiation

Explanation:

dude above was correct, took the test on apex and got this one correct..ty