Messi shoots a shot on goal with a speed of 200m/s.

A. What is its kinetic energy if the ball has a mass of 0.7kg?

B. How does its kinetic energy change if the speed is 180m/s

Answer:

Civil law deals with behavior that constitutes an injury to an individual or other private party, such as a corporation. Examples are defamation (including libel and slander), breach of contract, negligence resulting in injury or death, and property damage.

Explanation:

Answer:

cooking oil has a higher density than water

Explanation:

The maximum velocity, Vmax (in m/s) of a simple harmonic oscillator with a mass of 8 kg, a spring constant 75 N/m, and Total energy of 135 J can be determined using the formula: Vmax = √(2E/m) where E is the Total energy and m is the mass.

Substituting the given values into the formula, we get: Vmax = √(2E/m) = √(2 x 135 J/8 kg) = √(33.75)≈ 5.81 m/s Therefore, the maximum velocity of the simple harmonic oscillator is 5.81 m/s. Here is a detailed explanation for your understanding:

Given,Mass of the oscillator, m = 8 kgSpring constant, k = 75 N/mTotal energy, E = 135 J We know that the total energy of a simple harmonic oscillator is given by:E = 1/2 kx² + 1/2 mv²where x is the amplitude and v is the velocity of the oscillator.Substituting the given values, we get:135 J = 1/2 × 75 N/m × x² + 1/2 × 8 kg × v²The maximum velocity occurs at the equilibrium position, where x = 0.Therefore, the equation becomes:135 J = 1/2 × 8 kg × v²Simplifying and solving for v, we get:v = √(2E/m) = √(2 x 135 J/8 kg) = √(33.75)≈ 5.81 m/s

Therefore, the maximum velocity of the simple harmonic oscillator is 5.81 m/s.

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Humans emit waves at a frequency of 33.3 THz, which correspond to the infrared portion of the electromagnetic spectrum.

a) With a wavelength of 9.0 microns, the frequency of electromagnetic waves emitted by humans is roughly 33.3 THz. (terahertz).

b) These waves are part of the electromagnetic spectrum's infrared region, which is responsible for heat transfer and is widely used in technologies such as remote controls and thermal imaging cameras. Infrared waves belongs to the region of the spectrum where the wavelength is high but the frequency is low but they have shorter wavelength and longer frequency than the microwaves.

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A 60-cm diameter wheel accelerates uniformly from 130 rpm to 320 rpm in 4.1 s.

The problem gives us two important pieces of information about the wheel's motion: its initial and final rpm, and the time it took for the acceleration to occur.

To solve for the wheel's acceleration, we can use the following equation:

a = (v_f - v_i) / t

where a is acceleration, v_f is final velocity, v_i is initial velocity, and t is time. In this case, substituting the given values gives:

a = (320 rpm - 130 rpm) / 4.1 s

a = 46.34 rpm/s

Next, we can use the wheel's diameter to convert its rpm into linear velocity, using the formula:

v = πdN / 60

where v is velocity, d is diameter, and N is rpm. Substituting the given values gives:

v_i = π(60 cm)(130 rpm) / 60 = 409.16 cm/s

v_f = π(60 cm)(320 rpm) / 60 = 1022.91 cm/s

Finally, we can use the time and acceleration to find the distance the wheel traveled during its acceleration, using the formula:

d = vi*t + (1/2)at^2

where d is distance, vi is initial velocity, t is time, and a is acceleration. Substituting the given values gives:

d = (409.16 cm/s)(4.1 s) + (1/2)(46.34 rpm/s)(4.1 s)^2

d = 782.34 cm

Therefore, the wheel traveled approximately 7.82 meters during its acceleration.

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A lunar month is the period of time during which the Moon's phases repeat. There are around 29 days in a lunar month. There are therefore twelve lunar months Every two or three years, there is a lunar year with 13 full moons, which is used to adjust the days to the calendar like we do with leap years.

The Moon is a satellite that may have been created when the Earth was struck by the enormous planet Theia 4.5 billion (4500 million) years ago. A portion of the Earth broke off and was retained by gravity in an orbit around the planet.

The Moon has a 1738 km average radius. While the Moon travels around 4 cm away from Earth year, the average distance between them is 384400 km.

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The distance traveled by the student's boxcar that starts from rest and reaches an acceleration and velocity of 13.1 m/s² and 24.5 m/s, respectively, is 22.9 meters.  

We can find the distance traveled by the boxcar with the following kinematic equation:

\( v_{f}^{2} = v_{i}^{2} + 2ad \)

Where:

\( v_{f}\): is the final velocity = 24.5 m/s

\( v_{i}\): is the initial velocity = 0 (it starts from rest)

a: is the acceleration = 13.1 m/s²

d: is the distance =?

By solving the above equation for d, we have:

\( d = \frac{v_{f}^{2} - v_{i}^{2}}{2a} = \frac{(24.5 m/s)^{2}}{2*13.1 m/s^{2}} = 22.9 m \)

Therefore, the boxcar will travel 22.9 meters.

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Answer: 8.75 km/hr

Explanation:

Concept to know

Average speed: total distance/total time

-------------------------------------------------------

 total distance/total time

=(12.2+19.3)/(1.4+2.2) ⇔ add the numbers of two time running together

=31.5/3.6 ⇔ simplify

=8.75 km/hr

Hope this helps!! :)

Please let me know if you have any question

Answer:

weight on earth is mg

which is 5*9.8

49 Newton

weight on moon is 1/6 th of weight on earth

1/6*49

8.166 Newton..

Answer:

1

For instance, on Earth, a 5.0-kg object weighs 49 N; on the Moon, where g is 1.67 m/s2, the object weighs 8.4 N.

2

The weight of the object on the surface of earth would be 5kg. The weight of the object on the surface of moon would be 5/6= 0.83 as the weight of any object on earth is six times than that on moon.

The speed of the bottle when recoiling if it could move freely is 0.092 m/s.

The problem isn't complete. A similar problem is in the attachment. When we free the cork from the bottle, the cork and the bottle have a collision. According to the law of conservation of momentum, the momentum before and after the collision is the same.

p = p'

m₁ v₁ + m₂ v₂ = m₁ v₁' + m₂ v₂'

m₁ v₁ + m₂ v₂ = m₁ v₁' + m₂ v₂'

(0.0075 × 22) + (1.8 × 0) = (0.0075 × 0) + (1.8 × v₂')

0.165 + 0 = 0 + 1.8v₂'

1.8v₂' = 0.165

v₂' = 0.165 ÷ 1.8

v₂' = 0.092 m/s

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Answer:

177 coulomb

Explanation:

Given data

I=2.95A

T=60

The relationship between current I and quantity of charge Q.

Q=IT

Substitute

Q=2.95*60

Q=177 coulomb

Answer:

I'm not sure but I think it is electric currents in the outer core

The friction force on the board is in the direction of motion of the block thus the board would proceed in the same direction as the block as it began to slow down.

Here are the items:

The bottom surface of the board and there is no resistance.

The board and the block are in contact with one another.

As a result, the block's kinetic energy would be lost, and effort would be required to overcome the frictional force. In contrast to the direction of motion of the block, the friction force on the board is in the direction of motion of the block. The board would proceed in the same direction as the block as it began to slow down.

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Answer:

Chemical energy is energy stored in the bonds of atoms and molecules. ...

Mechanical energy is energy stored in objects by tension. ...

Nuclear energy is energy stored in the nucleus of an atom—the energy that holds the nucleus together. ...

Gravitational energy is energy stored in an object's height.

Answer:

Nuclear power

Electricity

Mechanic

Gravity

Explanation:

The CRO (Cathode Ray Oscilloscope) will display a triangular wave that is vertically stretched and horizontally compressed.

The vertical deflection plates will cause the triangular wave to be displayed with a peak-to-peak amplitude of\(100 cm (50 V * 0.1 cm/V)\), while the horizontal deflection plates will cause  sawtooth wave to be displayed with a peak-to-peak amplitude of \(5000 cm (100 V * 0.02 cm/V).\) The synchronization of the two inputs will ensure that the triangular wave and the sawtooth wave are displayed in a coordinated manner, with each cycle of the sawtooth wave corresponding to five cycles of the triangular wave. The resulting display will show a pattern of diagonal lines that gradually rise and then quickly drop back to the starting position, with each line representing a cycle of the sawtooth wave.

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Answer:

Nuclear reactors are the heart of a nuclear power plant. They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity.

Answer:

A nuclear power plant's heart is made up of nuclear reactors. They contain and regulate nuclear chain reactions, which produce heat via a physical process known as fission. This heat is converted to steam, which powers a turbine to generate energy.

"Bernoulli's principle indicates that increasing the velocity of a fluid will cause its pressure to increase." According to the Bernoulli's principle this statement is incorrect or false.

According to Bernoulli, when he research about flow of the liquid, he finds out that when the speed of liquid is increasing then the pressure on the liquid is decreasing. In other words the potential energy of the liquid will become less.

According to the Bernoulli's principle, when the speed of liquid is increasing then the pressure on the liquid is decreasing. In other words the potential energy of the liquid will become less.

That means when there is less pressure on a tube that gives less pressure in the water and gives a lot of area to flow. Then the flow of the liquid increases.

Not only pressure many other forces that acting on the liquid, if its become less efficient on the liquid. Like gravitational potential energy and many more. Then the liquid flows verry frequently.

But the statement tells opposite to the Bernoulli's principle, So from the discussion we can easily conclude that this statement is incorrect or false.

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To answer this question, we need to use the formula that relates force, mass, and acceleration: F=ma. We can rearrange this formula to solve for acceleration: a=F/m.

In this case, we are given that the force applied by the motor is 13.9N, and we need to find the velocity at which it will pull a mass. We are not given the mass directly, but we can calculate it using the power of the motor (300W) and the velocity we are trying to find.

Power is defined as the rate at which work is done, or P=W/t, where W is the work done and t is the time it takes to do that work. In this case, we can assume that the work done is moving the mass a certain distance, and we can use the velocity to calculate the time it takes to do that work. So, we have:

P=Fv

where P=300W, F=13.9N, and v is the velocity we want to find. Rearranging this equation gives:

v=P/F

Now we can substitute in the values for P and F to get:

v=300/13.9

v≈21.6 m/s

So, at a velocity of 21.6 m/s, a 300.W motor applying a force of 13.9N can pull a mass.

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Yes,Sometimes friction does positive work

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

Friction is a type of contact force and one of it's best advantage is that it enables walking and enables the application of brake in vehicles and other automobile.

Though friction has many disadvantags like wear and tear of material, loss of heat energy and reducing efficiency but it also have some positive effect in daily life as mentioned above.

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Answer:

Angle of incidence = Angle of Reflection

34° = Angle of Reflection

So, Angle of Reflection is equal to 34°

hope it helps!

Answer: 56 degrees

Explanation:

The angle of incidence is equal to the angle of reflection, but it is not asking us for the angle of reflection. It is asking us for the angle with the reflected SURFACE. It is 90-34= 56. Look at the pic attached if you need a labelled diagram

Answer:

d. Is indicated when a magnetometer measures intervals of magnetism that are weaker than expected

Explanation:

Magnetic field intensity is measured with a magnetometer on the surface of the Earth. Areas in which the magnetic field strength is lower or more than average are known as areas with magnetic anomalies, which may be due to  the presence of rocks that have a different magnetic characteristics

Where the magnetic anomaly is negative, it is indicative of a magnetic field strength reading that is lower than average magnetic field which is generally obtainable

Therefore, the correct option is indicated when a magnetometer measures intervals of magnetism that are weaker than expected

46.6666 that is the mass number

Explanation:

14 divided 3.0

Answer:nfeergnjknrtgrth

Explanation:

Answer:

F = GMm/r^2

MA = GMm/r^2

A = GM/r^2

A = (6.67 * 10^-11)(6.42 * 10^23) / (3.37 * 10^6)^2

A = 3.77 m/s^2

Explanation:

The term you are looking for is "chemical battery". Chemical batteries work by converting chemical energy into electrical energy through a series of chemical reactions. These reactions take place within the battery's cells, which are composed of two electrodes and an electrolyte.

When the battery is connected to a circuit, the chemical reactions produce an electrical current that can be used to power devices. Chemical batteries are widely used in many applications, including consumer electronics, electric vehicles, and renewable energy systems. They are a crucial component of our modern technological society, and ongoing research is focused on developing more efficient and sustainable battery technologies to meet growing energy demands.

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The entropy change is positive and proportional to the number of moles of gas and the natural logarithm of 2 and  the entropy of mixing is given by ΔS = -R(nAfa ln fa + nBfb ln fb).

The change in entropy when the partition is removed and the gases mix can be calculated using the formula:

ΔS = -R[na(fA ln fA + (1-fA) ln (1-fA)) + ng(fB ln fB + (1-fB) ln (1-fB))]

where R is the gas constant, na and ng are the number of moles of gases A and B, respectively, and fA and fB are the fractions of the container that they occupy before mixing.

The formula for entropy change is based on the idea that the number of ways in which the molecules can be arranged in the combined volume is greater than the number of ways in which they could be arranged if they were separated into two volumes. This increase in the number of possible microstates leads to an increase in entropy.

The first term in the equation represents the contribution of gas A to the entropy change, while the second term represents the contribution of gas B. The logarithmic terms arise from the fact that the number of microstates is proportional to the natural logarithm of the number of ways in which the molecules can be arranged.

In the case where the two gases are identical (i.e., na = ng and fA = fB), the entropy change simplifies to:

ΔS = R[na ln 2]

This result shows that the entropy change is positive and proportional to the number of moles of gas and the natural logarithm of 2.

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Without time dilation, the muon would travel approximately 659.54 meters before decaying. Due to time dilation, the muon's lifetime appears longer to an observer on Earth.

Part C: Without time dilation, the average lifetime of a muon in its rest frame is approximately 2.2 microseconds (2.2 μs). In this case, we can use the formula:

dμ = vμ * tμ,

where

dμ is the distance traveled by the muon,

vμ is the velocity of the muon, and

tμ is the average lifetime of the muon.

Let's assume that the muon is traveling at a velocity close to the speed of light, which is approximately 299,792,458 meters per second (m/s). Converting the lifetime to seconds, we have tμ = 2.2 μs = 2.2 × 10^(-6) s. Plugging these values into the formula:

dμ = (299,792,458 m/s) * (2.2 × 10^(-6) s)

   ≈ 659.54 meters.

Therefore, without time dilation, the muon would travel approximately 659.54 meters before it decayed.

Part D: Now, let's consider the effects of time dilation. According to special relativity, when an object moves at a high velocity relative to an observer, time appears to run slower for the moving object.

From the muon's perspective, its average lifetime remains unchanged at 2.2 μs. However, for an observer on Earth, the muon's lifetime appears longer due to time dilation. The time dilation factor can be calculated using the Lorentz transformation:

t' = tμ / γ,

where

t' is the time experienced by the observer,

tμ is the muon's proper time (2.2 μs), and

γ is the Lorentz factor, given by γ = 1 / sqrt(1 - (vμ/c)^2).

Given that the muon's velocity is close to the speed of light (299,792,458 m/s), we can substitute these values into the formula to find γ.

γ = 1 / sqrt(1 - (299,792,458 m/s / 299,792,458 m/s)^2)

   = 1 / sqrt(1 - 1)

   = 1 / sqrt(0)

   = 1 / 0 (undefined).

As the denominator approaches zero, γ approaches infinity. This means that time dilation becomes extremely significant as the muon approaches the speed of light.

For the observer on Earth, the muon's lifetime will appear significantly longer due to time dilation. However, from the muon's perspective, it experiences its proper lifetime of 2.2 μs.

To calculate the distance traveled by the muon, we can use the formula:

dμ = vμ * t',

where

dμ is the distance traveled by the muon (which we need to find),

vμ is the velocity of the muon (299,792,458 m/s), and

t' is the time experienced by the observer on Earth (the dilated time).

Since γ is extremely large, t' will be much larger than the muon's proper time. However, without knowing the specific velocity of the muon, it's not possible to calculate the exact time dilation factor or the distance traveled by the muon.

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Answer:

The angular acceleration α = 14.7 rad/s²

Explanation:

The torque on the rod τ = Iα where I = moment of inertia of rod = mL²/12 where m =mass of rod  and L = length of rod = 4.00 m. α = angular acceleration of rod

Also, τ = Wr where W = weight of rod = mg and r = center of mass of rod = L/2.

So Iα = Wr

Substituting the value of the variables, we have

mL²α/12 = mgL/2

Simplifying by dividing through by mL, we have

mL²α/12mL = mgL/2mL

Lα/12 = g/2

multiplying both sides by 12, we have

Lα/12 × 12 = g/2 × 12

αL = 6g

α = 6g/L

α = 6 × 9.8 m/s² ÷ 4.00 m

α = 58.8 m/s² ÷ 4.00 m

α = 14.7 rad/s²

So, the angular acceleration α = 14.7 rad/s²

The separation length of induced dipole is \(E_{net}\) =\(\frac{kq}{d^{2} }\) ( 1 + \(\frac{s}{8d}\) ) leftward.

What is dipole moment?

A charge separation results in dipole moments. Dipole moments are caused by changes in electronegativity and can appear in ionic bonds between two ions or covalent bonds between atoms. The dipole moment increases with increasing electronegativity disparity. Another element affecting the size of the dipole moment is the distance between the charge separations. A molecule's polarity can be determined by its dipole moment.

We have,

Electric field due to dipole = E₂

As negative charge is nearer then the electric field will be toward the dipole.

E₁ = \(\frac{kqs}{r^{3} }\) = \(\frac{kqs}{(2d)^{3} }\) = \(\frac{kqs}{8d^{3} }\)

Now, electric field due to single charge -q = E₂

E₂ = \(\frac{kq}{r^{2} }\) = \(\frac{kq}{d^{2} }\)

\(E_{net}\) = E₁ + E₂ = \(\frac{kq}{d^{2} }\) ( 1 + \(\frac{s}{8d}\))

So, \(E_{net}\) = \(\frac{kq}{d^{2} }\) (1 + \(\frac{s}{8d}\) ) leftward.

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The tension in the string between the blocks depends on the applied force F and the ratio of the masses mB/mA.

When the frictionless system is accelerated by an applied force of magnitude F, the tension in the string between the blocks can be determined using Newton's Second Law of Motion. The equation for this law is F = m*a, where F is the force, m is the mass, and a is the acceleration.
For the block connected to the applied force, let's call it block A, the force equation would be F = mA*aA. For the other block, block B, the force equation would be T = mB*aB, where T is the tension in the string. Since both blocks are connected by the string and moving together, their acceleration (aA and aB) is the same.
We can now express the tension T in terms of the applied force F, masses mA and mB, and the acceleration a:
T = mB*(F/mA).
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