A 0.5-kilogram soccer ball is kicked with a force of 50 newtons for 0.2 seconds. The ball was at rest before the kick. What is the speed of the soccer ball after the kick?

If you only know its speed, that's not enough information to catch it. You could even chase it at DOUBLE that speed, and you'd never catch it if you were chasing in the wrong direction.

You also have to know the DIRECTION the runaway car is going, so that you can chase in the same direction.

Now that you know its speed AND direction, you know its velocity. You need that information to have any chance of catching it.

The speed of light in material B is 1.6625 × 108 m/s.

The refractive index of a material is its optical density relative to that of a vacuum.

Material B has a refractive index of nB, and its speed of light is vB.

The speed of light in material A is given as 1.25 x 108 m/s.

The refractive indices of materials A and B have a ratio of nA/nB = 1.33.

We will use the formula:

nA/nB = vB/vA = nA/nB.

Therefore, nA/nB = vB/1.25 x 108 m/s.

This equation can be rearranged to give the speed of light in material B:

vB = nA/nB × 1.25 x 108 m/s.

Therefore, vB = 1.33 × 1.25 × 108 m/s.

We will perform this calculation:

vB = 1.6625 × 108 m/s.

Therefore, the speed of light in material B is 1.6625 × 108 m/s.

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Answer: it’s the diagram with a small tree on one side and a larger tree on the other side.

The ray diagram that shows the proper positioning of the image is: the first diagram, where the image is smaller than the object.

A concave mirror also known as converging mirror is a type of curved or spherical mirror in which the outside surface is silvered and the inner surface is made to reflect.

The size and the nature of the image of this kind of mirror is relatively dependent on the position of the object with regards the mirror.

Analysis:

When the object is behind the centre of curvature, the  image is seen to be real, inverted and smaller than the object.

So, the image of the concave mirror increases in size as the object gets closer to the centre of curvature and would be same size as the object at the centre of curvature.

In conclusion, the ray diagram that shows the proper positioning of the image is the first diagram.

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Answer:

answer is D. Stage 1 .....

Stage 2 of sleep usually comes before REM sleep. The correct option is C.

The stages of sleep are categorized into four different stages based on the characteristics of brain waves, eye movements, and muscle activity:

Stage 1: This is the lightest stage of sleep, where the brain produces alpha and theta waves, and the body begins to relax. During this stage, people can be easily woken up, and it usually lasts for around 5-10 minutes.

Stage 2: This stage is considered a transitional stage from light sleep to deep sleep. During stage 2, the brain produces sleep spindles and K-complexes, which help to suppress external stimuli and consolidate memories.

Stage 3: This stage is known as deep sleep or slow-wave sleep, where the brain produces delta waves. It is during this stage that the body repairs and regenerates tissues strengthens the immune system, and releases hormones.

Stage 4: This stage is also considered a part of deep sleep, and the brain produces mostly delta waves. Stage 4 is the most restorative stage of sleep, and it is difficult to wake up from this stage. This stage is also referred to as delta sleep or slow-wave sleep.

It's important to note that in recent years, sleep experts have revised the staging system and combined stages 3 and 4 into a single stage, known as N3.

Here in this question,

REM (Rapid Eye Movement) sleep is a stage of sleep characterized by rapid and random eye movements, low muscle tone, and vivid dreams. It is considered the deepest stage of sleep and is associated with cognitive and emotional processing, memory consolidation, and learning. During REM sleep, the brain is very active, and the body is effectively paralyzed, except for the diaphragm and eye muscles. REM sleep usually occurs several times throughout the night, and its duration increases with each sleep cycle.

Therefore, The Stage 2 of sleep usually comes before REM sleep is correct.

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The frequency of light with a wavelength of 655 nm is\(4.57 x 10^14 Hz\) and 515 nm is \(5.82 x 10^14\) Hz and  475 nm is\(6.31 x 10^14 Hz\)

The equation that links the speed of light to wavelength and frequency is

c = λν

Where, c = speed of lightλ = wavelengthν = frequency c is a constant of 2.998 x 10^8 m/s.

Calculating the frequency of light with a wavelength of

655 nm:λ = 655 nm = \(6.55 x 10^-7m\)

Using the above equation, we get

c = λνν = c/λ = \((2.998 x 10^8 m/s)/(6.55 x 10^-7m)ν = 4.57 x 10^14 Hz\)

Therefore, the frequency of light with a wavelength of 655 nm is 4.57 x \(10^14 Hz.\)

Calculating the frequency of light with a wavelength of 515 nm:λ = 515 nm = \(5.15 x 10^-7m\)

Using the above equation, we get

c = λνν = c/λ =\((2.998 x 10^8 m/s)/(5.15 x 10^-7m)ν = 5.82 x 10^14 Hz\)

Therefore, the frequency of light with a wavelength of 515 nm is 5.82 x \(10^14 Hz\).

Calculating the frequency of light with a wavelength of 475 nm:λ = 475 nm = \(4.75 x 10^-7\)m Using the above equation, we get

c = λνν = c/λ = \((2.998 x 10^8 m/s)/(4.75 x 10^-7m)ν = 6.31 x 10^14 Hz\)

Therefore, the frequency of light with a wavelength of 475 nm is 6.31 x \(10^14 Hz.\)

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The interval between the first and second echo is 7 seconds. This means that after the initial sound wave reaches the first cliff, it takes a total of 7 seconds for the sound to travel to the second cliff and then return to the student as the second echo.

To determine the interval between the first and second echo, we need to consider the time it takes for sound to travel from the student to the first cliff, and then from the first cliff to the second cliff, and finally back to the student.

Let's break down the distances and calculate the time for each part of the journey:

Distance from the student to the first cliff: 330 meters

Time taken: t₁ = distance / speed = 330 m / 330 m/s = 1 second

Distance from the first cliff to the second cliff: 990 meters

Time taken: t₂ = distance / speed = 990 m / 330 m/s = 3 seconds

Distance from the second cliff back to the student: 990 meters

Time taken: t₃ = distance / speed = 990 m / 330 m/s = 3 seconds

Now, we can calculate the total interval between the first and second echo by adding up the individual times:

Interval between first and second echo = t₁ + t₂ + t₃ = 1 s + 3 s + 3 s = 7 seconds

Therefore, the interval between the first and second echo is 7 seconds. This means that after the initial sound wave reaches the first cliff, it takes a total of 7 seconds for the sound to travel to the second cliff and then return to the student as the second echo.

It's important to note that this calculation assumes a straight path for the sound waves and neglects factors such as air temperature and wind that can affect the speed of sound. Additionally, it assumes perfect reflection of sound waves off the cliffs, which may not be the case in real-world scenarios.

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Note the complete questions is:

A student stands 330m from a tall cliff which is 990m from another tall cliff. If the speed of sound between the cliffs is 330m/s.What is the interval between the first and second echo?

The point that represents maximum potential energy is W.

The point that represents potential energy at 0 joules is Z.

The point that represents potential energy at 50 percent is Y.

The point that represents maximum kinetic energy is X.

Potential energy is the energy held through an object because of its function relative to other items, stresses inside itself, its electric-powered fee, or different elements. potential energy is energy this is saved – or conserved - in an object or substance. This saved energy is based totally on the position, arrangement, or state of the object or substance.

Potential energy refers to the stored energy within an object that exists because of the item's role, country, or arrangement. Potential energy is the strength this is stored in an item because of its function relative to some 0 roles. An item possesses gravitational capability strength if it is located at a top above (or beneath) the zero top.

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Answer:

Explanation:

Vector add the two forces

If we assume the forces lie on a unit circle

25cos180 + 10cos0 = -15 or 15cos180 N

The magnitude of -15 = |-15| = 15 N

The two forces acting from opposite directions will cancel each other in magnitude. The net force acting on the box is 15 N to the left.

Force is an external agent acting on a body to deform it or to change its state of rest or motion. Force is a vector quantity and its characterised by its magnitude and direction.

If two forces acting on a body from the same directions, then the net force will be the sum of these two  forces. If these forces are acting from opposite directions, they will cancel each other in magnitude.

Here, 10 N is acting to right and 25 N to the left. Hence, the net force will be 25 -10 = 15 N to the right, because the greater force is to the right. Hence, option B is correct.

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The cart is in equilibrium since it's moving at a constant velocity. This means the net horizontal force on the cart is 0, so the frictional force and pulling force cancel one another. So the pulling force has magnitude 12 N, same as the frictional force.

Answer:

dorsiflexion

Explanation:

To decrease the angle between the anterior surface of the foot and anterior surface of the lower leg is described as: dorsiflexion

Answer:

dorsiflexion

Explanation:

Hope this helps

Answer:

the moon will be in between the sun and the moon covering the earth view of the sun

positive

Because adding electrons makes an object to be negative and removing makes it to be positive

Answer:

Mechanical waves are waves that require a medium. This means that they have to have some sort of matter to travel through. These waves travel when molecules in the medium collide with each other passing on energy. One example of a mechanical wave is sound.

The correct statements that describe elements are:

An element is a pure substance made up of only one type of atom. The elements are the basic building blocks of matter and make up everything around us.

There are 118 known elements, which are organized on the periodic table based on their atomic number, electron configurations, and chemical properties.

Each element has unique properties and is defined by its atomic number, which is the number of protons in its nucleus.

Some examples of elements include;

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Answer:

7.407 recurring m/s^2

Explanation:

Initial velocity= 0 m/s [as it starts from rest]

Final velocity= 10 m/s

Time taken= 1.35 s

Hence,

Acceleration = Final velocity - Initial velocity

                                 Time taken

a=10

   1.35

a=7.407 recurring m/s^2

Answer:

The final angular velocity is  \(w_f = 2.1994 rad/sec\)

The angular acceleration is  \(\alpha = 1.099 \ rad/sec^2\)

Explanation:

From the question we are told that

    The radius of each  plate is  \(r = 30 \ cm = \frac{30}{100} = 0.3 \ m\)

    The mass of each  plate is  \(m_p = 1 \ kg\)

    The angular speed of the spinning plate is \(w = 0.7 \ rev \ per \ sec = 0.7 * 2 \pi = 4.3988 \ rad/sec\)

  From the law of conservation of momentum

         \(L_i = L_f\)

Where \(L_i\) is the initial angular momentum of the system (The spinning and stationary plate ) which is mathematically represented as

          \(L_i = I_1 w + 0\)

here \(I_1\) is the moment of inertia of the spinning plate which mathematically represented as

              \(I_1 = \frac{m_pr^2}{2}\)

      and the zero signify that the stationary plate do not have an angular momentum as it is at rest at the initial state

         \(L_f\) is the final angular momentum of the system (The spinning and stationary plate) , which is mathematically represented as

              \(L_f = (I_1 + I_2 ) w_f\)

Where  

           \(I_2\) is the moment of inertia of the second plate (This was stationary before but now it spinning due to the first pate )   and is equal to  \(I_1\)

and  \(w_f\) is the final angular speed

So we have  

             \(I_1 w = (I_1 + I_2)w_f\)

             \(\frac{m_p r^2}{2} * w = 2 * \frac{m_p r^2}{2} * w_f\)

             \(w = 2 * w_f\)

substituting values

             \(4.3988 = 2 * w_f\)

            \(w_f = \frac{4.3988 }{2}\)

            \(w_f = 2.1994 rad/sec\)

The the rotational impulse-momentum theorem can be mathematially represented as

        \(\tau * \Delta t = 0.09891\)

Where \(\tau\) is the torque  and  \(\Delta t\) is the change in time  

So at  \(\Delta t = 2 \ sec\)

        \(\tau = \frac{0.09891}{2}\)

        \(\tau = 0.0995 \ Nm\)

now the angular acceleation is mathematically represented as

         \(\alpha = 2 * \frac{\tau}{m_p * r^2 }\)

substittuting values

           \(\alpha = 2 * \frac{0.0995}{1 * 0.3^2}\)

           \(\alpha = 1.099 \ rad/sec^2\)

A I think sorry if I'm wrong

The angle between the reflected and refracted rays is the same as the angle of incidence, which is 48.0°. This is because of the law of reflection.

Reflection is the process of actively and critically considering an experience or event in order to gain a deeper understanding of it. Reflection can be a powerful tool for personal growth and development, helping us to take control of our lives and make positive changes. Reflection involves analyzing and interpreting our thoughts and feelings about an experience, and can be done through writing, talking, or thinking. It is a way of exploring our beliefs, values, and assumptions, and is often used to explore our emotions, behaviours, and relationships.

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Answer:

\(m=14kg\)

Explanation:

Hello.

In this case, since the force is defined in terms of the mass and acceleration by:

\(F=m*a\)

We can easily compute the mass by solving for it:

\(m=\frac{F}{a}\)

Whereas the force is 182 N (kg*m/s²) and the acceleration is 13 m/s², therefore, we obtain:

\(m=\frac{182kg\frac{m}{s^2} }{13\frac{m}{s^2}}\\\\m=14kg\)

Best regards.

The direction and magnitude of the net vector is:

When vector A with magnitude of 5 meters pointing west and

vector B with magnitude of 5 meters pointing east are added,

they will result in a net vector with a magnitude of the difference between the magnitudes of the vectors and a direction equal to the direction of the vector with the largest magnitude.

Since both vectors have the same magnitude (5 meters), the net vector will have a magnitude of 0 meters.

This means that the vectors completely cancel each other out and there is no net vector remaining.

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Answer:

B) Blinking .

Explanation:

Answer:

However, the disadvantages are:

1. Many atimes for some motion prolems, free-body diagrams has to be drawn many times so to have enough equations to solve for the unknowns. This is not the same with energy conservation principles.

2. In situations where we need to find the internal forces acting on an object, we can't truly solve such problems using free-body diagram as it captures external forces. This is not the same with energy conservation principles.

Explanation:

Often times the ideal method to use in solving motion problem related questions are mostly debated.

Energy conservation principles applies to isolated systems are useful when object changes their positions in moving upward or downward converts its potential energy due to gravity for kinetic energy, or the other way round. When energy in a system or motion remains constant that is energy is neither created nor destroyed, it can therefore be easier to calculate other unknown paramters like in the motion problem velocity, distance bearing it in mind that energy can only change from one type to another.

On the other hand, free body diagram which is a visual representation of all the forces acting on an object including their directions has so many advantages in solving motion related problems which include finding relationship between force and motion in identifying the force acting on a body.

The new planet has the radius of only 1/4th of earth and mass of half that of earth. Then , the gravity on the surface of the new planet will be8 times higher than that of earth.

The gravitational force is the force by which an object attracts other object into its center of mass. Earth attracts every objects on ots surface to the ground by gravitation.

The force of gravitation is directly proportional to the mass and inversely proportional to the distance or radius of the planet.

g =  G m/r²

Where G is the universal gravitational constant.

The new planet has the mass half of that of earth (me) and radius 1/4th of earth.

gn = G me/2 (re/4)²

  = G 16 me/2

  = 8 ge

Where ge is the gravity by earth and gn that of new planet. The gravitational force of the new planet will be 8 times greater than that of earth.

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An item at rest will remain at rest, and an object in motion will continue to move in a straight path at a constant speed, according to the first law of motion, commonly known as the law of inertia.

Newton's laws of motion govern how a baseball moves as a result of being thrown or struck. According to Newton's first law, a moving ball will continue to move in a straight line until other forces are acting on it.

The ball is severely distorted by the enormous force the bat applies to it ball being struck. The average force acting during the bat-ball collision is therefore about two tons, with a peak force of nearly four tons, during the 0.7 millisecond contact time. There's a lot of force there!

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Answer:

In a standing sound wave in a pipe, nodes are regions of mean atmosphere pressure and low displacement.

Answer: A.

just did it

Explanation:

The amount of load lifted by the pulley when the efficiency is 60% and effort is 50 N is determined as 30 N.

The amount of load lifted by the pulley is calculated by applying the formula for efficiency of a machine as follows;

E = L / E   x  100%

where;

The amount of load lifted by the pulley is calculated as;

60 = L / 50   x 100%

60 = 100L / 50

100L = 50 x 60

100 L = 3000

L = 3000 / 100

L = 30 N

Thus, the amount of load lifted by the pulley is 30 N.

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Answer:

Explanation:

1) The amount of work done by Tyler is equal to the force applied multiplied by the distance over which the force is applied. In this case, the force applied is 0.5 N and the distance is 20 meters. So, the work done is 0.5 N x 20 meters = 10 Joules

2) The work done is equal to the force applied multiplied by the distance over which the force is applied. In this case, the work done is 18 Joules and the force applied is 3 N. To find the distance, we can divide the work by the force: 18 Joules / 3 N = 6 meters

3) To find the force applied by each girl, we can use the formula work = force x distance.

Yamileth: 28 Joules = force x 4 meters => force = 28 Joules / 4 meters = 7 N

Cianna: 36 Joules = force x 4 meters => force = 36 Joules / 4 meters = 9 N

Yamileth used a force of 7 N to get Mr. Williams the copies and Cianna used a force of 9 N. Therefore, Cianna used greater force than Yamileth.