a 10853-n car is traveling at 11.3 m/s along a horizontal road when the brakes are applied. the car skids to a stop in 5.8 s. how much kinetic energy does the car lose in this time?

For the given problem, the electrical conductivity (σ) for an ohmic conductor is calculated as follows:

Electrical conductivity, σ is defined as the ratio of current density, J to the electric field intensity, Eσ = J/E

From Ohm’s law, we know that

J = σ × E where J is the current density, E is the electric field intensity and σ is the electrical conductivity. Now, consider a conductor with length l, cross-sectional area A, and number density of free electrons, n. The drift velocity, vd of electrons is given asvd = eEτ/m

where e is the charge of the electron, m is the mass of electron and τ is the relaxation time of electrons.

It can be written as J = nAe vd Putting the value of vd from the above equation, we getJ = nAe2τE/ml Now, we can substitute the value of J from Ohm’s lawσE = nAe2τE/ml

Thus,σ = ne2τ/m

The electrical conductivity for an Ohmic conductor with a number density of free electrons n = 1.1 × 1029 per cubic meter and the collision time τ of 1.9 × 10-14 s, is 4.21 × 107 S/m.

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The control in the experiment is option B. The group that is given no shock.

The method utilized by the researcher in scientific study to reduce the impact of unimportant factors is known as experimental control. The power of the independent variable to alter the dependent variable is further strengthened by experimental control. 9 Nov 2021

A controlled experiment is a scientific test carried out under predetermined circumstances in which only one (or a small number of) variables are altered at a time while all other variables are maintained constant.

Researchers use experimental controls to reduce the impact of unrelated experience and environmental factors, as well as to strengthen the conclusion that changes in the dependent variable are caused by the independent variable (the ability to infer causality).

Hence, option B is correct as it is not receiving any special treatment in the experiment.

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Answer:

P = 15 [W]

Explanation:

Power is defined as the relationship between work over a certain time.

In this way we must calculate the work which is defined as the product of force by distance.

\(W=F*d\\W=75*20\\W=1500[J]\)

And the power.

\(P=W/t\\P=1500/100\\P=15[W]\)

Power given in units of watts.

When a fragment of bone containing carbon-14 isotopes of the element carbon is discovered during an archaeological dig, and it is estimated to be approximately 23,000 years old, one can calculate the proportion of the carbon-14 isotopes that remains.

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Given,

The weight, W = 190 N

The height, H = 45 m

The potential energy is calculated by the formula,

Calculate the potential energy by substituting the given values.

Thus, the potential energy is 8,550 Joules.

The magnitude of the acceleration of the 5kg crate is 11.69 m/s^2. This means that the crate is accelerating towards the south-east direction with a magnitude of 11.69 m/s^2 due to the net force acting on it.

To find the magnitude of the acceleration, we need to calculate the net force acting on the crate and then use Newton's second law of motion (F=ma) to solve for the acceleration.

First, we need to resolve the two forces into their horizontal and vertical components. The 60N force to the north has no horizontal component, so its vertical component is 60N. The 8N force to the west has no vertical component, so its horizontal component is 8N.

Next, we need to add the horizontal and vertical components of the forces separately to get the net force acting on the crate. The vertical component of the net force is the sum of the vertical components of the two forces, which is:

60N - 0 = 60N (upwards)

The horizontal component of the net force is the sum of the horizontal components of the two forces, which is:

0 - 8N = -8N (to the left)

So the net force acting on the crate has a magnitude of:

|Fnet| = sqrt((60N)^2 + (-8N)^2) = 60.8N

Now we can use Newton's second law of motion to solve for the acceleration:

Fnet = ma

a = Fnet/m = 60.8N/5kg = 11.69 m/s^2 (to the south-east)

The magnitude of the acceleration of the 5kg crate is 11.69 m/s^2. This means that the crate is accelerating towards the south-east direction with a magnitude of 11.69 m/s^2 due to the net force acting on it.

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Answer:

B Energy is released

Explanation:

3 factors that account for the some of the missing 66.3% of the power that the solar cell does not convert to usable electricity are 1. Thermalization losses , 2.Transmission losses , 3.  Recombination losses

The Shockley-Queisser efficiency limit is an important concept in photovoltaics that describes the maximum theoretical efficiency of a solar cell based on its bandgap. This limit applies to single-junction silicon solar cells, which are currently the most widely used type of solar cell in the industry. The Shockley-Queisser efficiency limit is 33.7%. This means that even under ideal conditions, a single-junction silicon solar cell can convert no more than 33.7% of the energy in sunlight into usable electricity. The remaining 66.3% of the energy is lost in various ways, and these losses account for the difference between the actual efficiency of a solar cell and the theoretical maximum efficiency.

Here are three factors that account for some of the missing 66.3% of the power that the solar cell does not convert to usable electricity:

1. Thermalization losses: Some of the energy in sunlight is absorbed by the solar cell but is not converted into usable electricity. Instead, this energy is converted into heat, which raises the temperature of the solar cell. When the temperature of the solar cell rises, some of the energy that was originally in the sunlight is lost to the surroundings. This is known as thermalization loss.

2. Transmission losses: Some of the energy in sunlight is lost as it passes through the various layers of the solar cell. This is because each layer absorbs some of the energy in sunlight, which reduces the amount of energy that is available to be converted into usable electricity.

3. Recombination losses: When an electron is excited by sunlight and jumps from the valence band to the conduction band in the silicon crystal lattice, it leaves behind a positively charged hole. If the electron and hole recombine before they can be collected by the electrodes of the solar cell, the energy that was in the electron-hole pair is lost as heat. This is known as recombination loss.

These are three factors that account for some of the missing 66.3% of the power that the solar cell does not convert to usable electricity.

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Answer:

For uniform acceleration

a = (v2 - v1) /t = 2.5      acceleration is constant 2.5

v2 = 2.5 * 4         v1 = 0 at t = 0

v2 = 2.5 m/s^2 * 4 s = 10 m/s

If a ball is released at the top of a ramp at t = 0, then the speed of the ball after 4 seconds would be 10 meters per second, therefore the correct answer is option H.

There are three equations of motion given by  Newton,

v = u + at

S = ut + 1/2×a×t²

v² - u² = 2×a×s

As given in the problem, a If a ball is released at the top of a ramp at t = 0, then we have to find the speed of the ball after 4 seconds,

As we can observe from the given graph that the acceleration of the ball is 2.5 meters/second²,

By using the first equation of the motion,

v = u + at

v = 0 + 2.5×4

v = 10 meters per second

Thus, the speed of the ball after 4 seconds would be 10 meters per second.

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When the sun is setting and a thin cirrostratus cloud is present, you might see a range of colors, from yellows and oranges to pinks and purples. This is due to the light being refracted and scattered by the cloud, which can create a beautiful and colorful sunset.

Cirrostratus clouds are thin and wispy, and often appear as a white veil covering the sky. They are made up of ice crystals and form at high altitudes, usually around 18,000 feet or higher.Cirrostratus clouds are known to produce halos around the sun and moon. This is because the ice crystals that make up the cloud can refract and scatter light in such a way as to create a circular ring of light around the sun or moon.

This can be a beautiful and awe-inspiring sight to see, and is often associated with good weather.Cirrostratus clouds are often a sign of an approaching storm, as they can form ahead of a warm front. They are not usually associated with precipitation, but their presence can indicate that a storm is on the way. Overall, cirrostratus clouds are a fascinating and beautiful part of the natural world, and can provide a stunning backdrop to any sunset or sunrise.

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A projectile is launched at an angle of 33⁰ above the horizontal, then the projectile launched at an angle of 90 - 33 = 57⁰ will have the same range as the projectile launched at 33⁰. The correct option is (B) 57⁰.

In the absence of air resistance, a projectile launched at an angle of 33 above the horizontal will have the same range as a projectile launched at an angle of 57⁰.

The range of a projectile can be determined by using the range formula.

R = ((v^2 * sin(2θ))/g) Where

R is the range of the projectile,

v is the velocity of the projectile,

θ is the angle at which the projectile is launched, and

g is the acceleration due to gravity.

In the absence of air resistance,

the horizontal component of velocity of a projectile remains constant throughout the flight.

So, the range of a projectile depends only on its initial velocity and the angle at which it is launched.

If a projectile is launched at an angle θ,

the time of flight of the projectile can be calculated by using the following formula:

T = (2v * sin(θ))/g

The maximum height reached by the projectile is given by the formula:

H = (v^2 * sin^2(θ))/2gIf a projectile is launched at an angle θ, then the range of the projectile will be the same as the range of the projectile launched at an angle of (90 - θ).

So, if a projectile is launched at an angle of 33⁰ above the horizontal, then the projectile launched at an angle of 90 - 33 = 57⁰ will have the same range as the projectile launched at 33⁰.

Therefore, the correct option is (B) 57⁰.

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Answer:

see below

Explanation:

b ) the vibrations of the air particles are parallel to the direction of energy transfer.

c) use formula

speed = wavelength x frequency

speed = 0.85 x 400

speed = 340 m/s

hope you get it

please mark

We can solve this problem using the conservation of energy principle, which states that the total mechanical energy (potential energy + kinetic energy) of a system remains constant if no external work is done on the system.

At the top of the hill, the car has only potential energy, given by:

PE = mgh

where m is the mass of the car, g is the acceleration due to gravity, and h is the height of the hill.

PE = (1000 kg) x (9.81 m/s^2) x (200 m) = 1,962,000 J

At the base of the hill, the car has only kinetic energy, given by:

KE = (1/2)mv^2

where v is the velocity of the car.

Using the conservation of energy principle, we can equate the potential energy at the top of the hill to the kinetic energy at the base of the hill:

PE = KE

mgh = (1/2)mv^2

Canceling the mass on both sides, we get:

gh = (1/2)v^2

Solving for v, we get:

v = sqrt(2gh)

Substituting the given values, we get:

v = sqrt(2 x 9.81 m/s^2 x 200 m) = 44.3 m/s

Therefore, the velocity of the car at the base of the hill is approximately 44.3 m/s.

a. The minimum inductance of the tank circuit is 56.85 H

b. The maximum inductance of the tank circuit is 199.86 H

The resonant frequency of a series RLC circuit is given by

f = 1/2π√LC where

Making L subject of the formula, we have

L = (2πf)²/C

The minimum inductance of the tank circuit is 56.85 H

To find the minimum inductance, we substitute the value of

L = (2πf)²/C

L = (2π × 4.8 × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = (9.6π × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = (30.159 × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = 909.583 × 10⁻¹² Hz²/1.6 × 10⁻¹¹ F

L = 568.489 × 10⁻¹ H

L = 56.8489 H

L ≅ 56.85 H

The minimum inductance of the tank circuit is 56.85 H

The maximum inductance of the tank circuit is 199.86 H

To find the maximum inductance, we substitute the value of

L = (2πf)²/C

L = (2π × 9.0 × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = (18π × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = (56.549 × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = 3197.75 × 10⁻¹² Hz²/1.6 × 10⁻¹¹ F

L = 1998.59 × 10⁻¹ H

L = 199.859 H

L ≅ 199.86 H

The maximum inductance of the tank circuit is 199.86 H

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The type of collision that occurs when two cars collide, lock bumpers, and move together after the collision is an inelastic collision.

When two objects collide, the type of collision that occurs is determined by whether or not kinetic energy is conserved. In an elastic collision, kinetic energy is conserved, meaning that the total kinetic energy of the objects before the collision is equal to the total kinetic energy of the objects after the collision.

In an inelastic collision, kinetic energy is not conserved, and some or all of the kinetic energy is transformed into other forms of energy, such as heat, sound, or deformation of the objects involved in the collision. In the case of two cars colliding and locking bumpers, the kinetic energy of the cars before the collision is transformed into other forms of energy, such as deformation of the cars' frames and the sound of the impact.

After the collision, the cars are stuck together and moving as a single object, indicating that momentum is conserved. Momentum is always conserved in collisions, regardless of whether they are elastic or inelastic. In the case of the two cars colliding and locking bumpers, the momentum of the cars before the collision is equal to the momentum of the cars after the collision, even though some of the kinetic energy has been lost.

In conclusion, when two cars collide, lock bumpers, and move together after the collision, this is an example of an inelastic collision, where kinetic energy is not conserved, but momentum is conserved.

This is an inelastic collision. In an inelastic collision, kinetic energy is not conserved, and the colliding objects stick together after the collision. In this case, the two cars have locked bumpers and moved together after the collision, indicating that they have become stuck together and are moving as a single object.

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Answer:

the one that is clicked in the photo I think is right

Answer:

B

Explanation:

That is solar energy and the sun will be releasing energy constantly for the rest of its life, meaning renewable

Answer:

It would be transformer

Explanation:

hope this helped

Answer:

transformer

Explanation:

got it right

ANSWER: 4.0 N

EXPLANATION

The formula for Newton's second law is

\(F = ma\)

where:

Given:

mass (m) = 2.0 kg

acceleration (a) = \(2.0\) m/\(s^2\)

Required:

F = ?

Equation:

F = ma

Solution:

F = 2.0 x 2.0

Answer:

F = 4.0 N

Answer: In ecology, habitat identifies as the array of resources, physical and biotic factors, present in an area that allow the survival and reproduction of a particular species. A species habitat can be seen as the physical manifestation of its ecological niche.

Explanation:

We have the next formula

where P is power, W is work, and t is time

we substitute the values

then we isolate the work

the answer is 1,500 J

The speed of the first car is 52 mph.

The speed of the second car is 40 mph.

Let's use "x" mph to represent the second car's speed. We can express the first car's speed as "x + 12" mph because it is 12 mph faster. According to our knowledge, the first car travelled 234 miles, while the second car covered 180 miles.

The relationship between speed and distance travelled is inversely proportional. As a result, the proportion of distances covered by the two vehicles will match the proportion of their speeds:

234 / 180 = (x + 12) / x

To solve this equation, we can cross-multiply:

234x = 180(x + 12)

Expanding the equation:

234x = 180x + 2160

Rearranging terms:

234x - 180x = 2160

54x = 2160

Dividing both sides by 54:

x = 40

Therefore, the speed of the second car is 40 mph.

To find the speed of the first car, we can substitute the value of x back into the expression "x + 12":

x + 12 = 40 + 12 = 52

Hence, the speed of the first car is 52 mph.

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Explanation:

here's your answer.....!

The acceleration of the block is 15.97 m/s².

The acceleration of the box is determined by taking the net force on the block as follows;

∑F = ma

\(Fcos(\theta) = ma\\\\a = \frac{Fcos(\theta}{m}\)

where;

The acceleration of the block is calculated as follows;

\(a = \frac{200 \times cos(37)}{10} \\\\a = 15.97 \ m/s^2\)

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The movement of a body part around a central point or axis is known as rotation.

Rotation refers to the circular movement of a body part around its axis or a fixed point. It involves the turning or twisting motion of a body segment without changing its position in space.

Flexion (a) is the movement that decreases the angle between two body parts, typically bending or decreasing the joint angle. The extension (b) is the opposite movement, increasing the angle between two body parts, typically straightening or increasing the joint angle. Abduction (d) refers to the movement of a body part away from the midline of the body.

During rotation, the body part or segment moves around an imaginary line called the axis. This axis can be within the body itself or located externally. For example, when we rotate our head from side to side, the axis of rotation is an imaginary line passing through the neck.

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Answer:

The number of freely moving neutrons decreases over time.

Explanation:

During a fission reaction, the total number of protons remains the same. In other words, the charge is conserved. It is the neutron number that decreases during a fission reaction.

Therefore, 'The number of freely moving neutrons decreases over time' is the correct answer.

The force between a pair of cars in a train undergoing constant acceleration is much more significant compared to the forces between other cars in the same train.

The hypothesis on how the force between a pair of cars in a train undergoing constant acceleration compares to the forces between other cars in the same train is detailed below.

As the cars in a train undergo constant acceleration, the force between a pair of cars is more significant than the forces between other cars in the same train. This is due to the fact that as the acceleration increases, the force between a pair of cars increases because the car at the back is pushed forward while the car in front is pulling backward, and as a result, there is an increase in the force acting between the two cars.

                                    However, the forces between other cars in the same train are not as significant as the force between a pair of cars because there is no direct contact between them, and hence the force is much less. The greater the acceleration, the greater the force acting between a pair of cars in the train, while the force acting between other cars remains negligible.

Therefore, the force between a pair of cars in a train undergoing constant acceleration is much more significant compared to the forces between other cars in the same train.

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Answer:

Gases move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.

Explanation:

Answer:

2.75 s

Explanation:

From the question given above,

Total time (T) spent by the ball in air = 5.5 s

Time taken (t) to reach the greatest height =...?

Thus, we can obtain the time taken (t) for the ball to reach the greatest height as follow:

T = 2t

Where:

T is the total time spent by the ball in air.

t is the time taken to reach the greatest height

Total time (T) spent by the ball in air = 5.5 s

Time taken (t) to reach the greatest height =...?

T = 2t

5.5 = 2 × t

Divide both side by 2

t = 5.5/2

t = 2.75 s

Therefore, the time taken (t) to reach the greatest height is 2.75 s.