why do we increase potential difference along power lines

Answer:g=a=10m/s^2,

M=40kg,

S=150mm/1000=0.15m*30steps each=4.5m,

F=ma=40*10=400N

Power=W/t=F*s/t=F*V=1800/6 = 300W or 0.3kW

Explanation:

Stephanie's acceleration is  1 m/[tex]s^{2}[/tex].

Explanation:

In the present case, the initial velocity of the runner is given as 10 m/s. After 5 s, the runner runs with velocity of 15 m/s. If there is no change in direction, then the acceleration can be found easily as the change in velocity per unit time.

So, [tex]Acceleration = \frac{Change in velocity}{Time}=\frac{(Final velocity -Initial velocity)}{Time}[/tex]

[tex]Acceleration = \frac{15-10}{5}=\frac{5}{5}=1 m/s^{2}[/tex]

Thus, the acceleration will be 1 m/[tex]s^{2}[/tex].

So the change in velocity will lead to an acceleration of 1 m/[tex]s^{2}[/tex].

Answer:15m/s-10m/s over 5s

Explanation:its a fraction the 15m/s and 10m/s are over the 5s

Answer:

OK...   lets go the mathematical terms of magic is science and that the world is round ,GOD created everything Jesus died for us on the cross ,the big bang theory is something  scientist believe if you are a christian then you know that is a lie and if you are a REDNECK then fishing and hunting is life and REDNECK think city people SUCK BUTT that is life.

Explanation:

Quantum units in physics generally end with the suffix "on" because they are named after famous scientists who made significant contributions to the field.

In quantum mechanics, many units end with the suffix "on" because they are named after famous scientists who made significant contributions to the field. For example, the unit "electron" is named after J.J. Thomson, the physicist who discovered the electron. Similarly, the unit "photon" is named after Albert Einstein, who proposed the concept of light particles.

By using these named units, scientists can refer to specific quantities and entities in a concise and standardized manner. It helps in clear communication and facilitates research in the field of quantum mechanics.

Some examples of units in quantum mechanics that end with "on" include electron, photon, neutron, positron, and graviton.

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Using the equation v = u + at, the final velocity of the police car after maintaining an acceleration of 5 m/s^2 for 30 seconds is found to be 200 meters per second.

To determine the final velocity of a police car that accelerates from a given speed, we can use the formula for final velocity, which is derived from the equations of motion under constant acceleration. The formula we will use is v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.

In this case, the initial velocity u is 50 meters per second, the acceleration a is 5 m/s2, and the time t is 30 seconds. Plugging these values into the formula:

v = 50 m/s + (5 m/s2 × 30 s)

Calculating this, we get:

v = 50 m/s + 150 m/s = 200 m/s

Therefore, the final velocity of the police car after maintaining the acceleration for 30 seconds will be 200 meters per second.

Answer:

Solid

liquid

gas

Explanation:

Answer: [tex]4.86(10)^{-12}m[/tex]

Explanation:

The Compton Shift [tex]\Delta \lambda[/tex] in wavelength when photons are scattered is given by the following equation:

[tex]\Delta \lambda=\lambda' - \lambda_{o}=\lambda_{c}(1-cos\theta)[/tex] (1)  

Where:  

[tex]\lambda'=500 nm=500(10)^{-9} m[/tex] is the wavelength of the scattered photon

[tex]\lambda_{o}[/tex]  is the wavelength of the incident photon

[tex]\lambda_{c}=2.43(10)^{-12} m[/tex] is a constant whose value is given by [tex]\frac{h}{m_{e}.c}[/tex], being [tex]h=4.136(10)^{-15}eV.s[/tex] the Planck constant, [tex]m_{e}[/tex] the mass of the electron and [tex]c=3(10)^{8}m/s[/tex] the speed of light in vacuum.  

[tex]\theta=180\°[/tex] the angle between incident phhoton and the scatered photon.  

[tex]\Delta \lambda=2.43(10)^{-12} m (1-cos(180\°))[/tex] (2)

[tex]\Delta \lambda=4.86(10)^{-12}m[/tex] (3)  This is the shift in wavelength

Answer:

Solid: metal alloy

Liquid: beer

Gas: Air

Explanation:

A solution is a type of mixture where the solvent and solute are homogeneously mixed. Homogeneous mixture means that the solute shouldn't be able to be seen with the naked eye, filtered and stable enough.  

Metal alloy will be an example of a solution in solid-state. Beer is a solution made of liquid alcohol and liquid water. Air mostly composed of nitrogen, but it has oxygen, carbon dioxide, and many other substances in gaseous form.

Answer:

Explanation:

Work is applying a force to move an object over a distance. ... Machines make work easier by changing the strength or direction of a force. ... But many everyday objects, such as rakes, bottle openers, and ramps, are machines too. ... A flat surface (plane) set at an angle (inclined); a simple machine used to reduce the force ...

Answer:

true

Explanation:

Answer:

8,3375*10^-9 N

Explanation:

For two objects with masses of 100 kg and 500 kg to be 20 meters apart, the gravity between them would be 8.3375×10⁻⁹ Newtons.

The gravitational force is an unobservable force that draws things together. You remain on the ground thanks to Earth's gravity, a gravitational force is a force that also causes objects to fall.

F = G× m₁* m₂ / r ²

G is the gravitational constant which has a value of 6.67 ×10⁻¹¹.

As given in the problem, we have to find out the gravitational force between two objects with masses of 100 kg and 500 kg to be 20 meters apart,

F= 6.67×10⁻¹¹(100×500)/20²

F=8.3375×10⁻⁹ Newtons

Thus, the gravity between them would be 8.3375×10⁻⁹ Newtons.

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Final answer:

The correct notation to show that acceleration is a vector is 'â', denoting both its magnitude and direction. So the correct option is A.

Explanation:

To indicate that acceleration is a vector, the correct notation is to write the symbol 'â' (option A). Vectors are typically notated with an arrow on top, as in 'â', to represent their magnitude and direction. In physics, acceleration is defined as the rate at which velocity changes and it is a vector quantity, meaning it has both magnitude and direction. When acceleration is assumed to be constant, it is often represented simply as 'a', but when specifically referring to it as a vector, the arrow notation is used.

Answer:

B) A Compound machine

Explanation: I just took this quiz

CHARLES'S LAW

At a constant pressure, the volume of a given amount of gas is directly proportional to its absolute temperature.

Answer:

Directly propotional

Explanation:

Charles law states that volume of a fixed mass of a given is directly propotional to its absolute temperature

And

V∞ T

The speed is the distance covered by an object at a particular time. The distance covered by the car in 4 hours will be 227.273 miles.

The speed is the distance covered by an object at a particular time. Therefore, it is the ratio of distance and time.

[tex]\rm{Speed = \dfrac{Distance}{Time}[/tex]

Given that a car traveling at a constant speed travels 1000 feet in 12 seconds. Therefore, we can write the distance and time as,

Distance = 100 feet = 1000/5280 miles

Time = 12 seconds = 12/3600 hours

Now, the speed of the car can be written as,

Speed = Distance / Time

= (1000/5280 miles) / (12/3600 hours)

= (1000×3600) / (5280×12) miles per hour

= 56.818 miles per hour

Further, the distance that can be traveled by car is,

Distance = Speed × Time

              = 56.818 miles per hour × 4 hours

              = 227.273 miles

Hence, the distance covered by the car in 4 hours will be 227.273 miles.

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Answer:

(a) 4.21 m/s

(b) 24.9 N

Explanation:

(a) Draw a free body diagram of the object when it is at the bottom of the circle.  There are two forces on the object: tension force T pulling up and weight force mg pulling down.

Sum the forces in the radial (+y) direction:

∑F = ma

T − mg = m v² / r

v = √(r (T − mg) / m)

v = √(0.676 m (54.7 N − 1.52 kg × 9.8 m/s²) / 1.52 kg)

v = 4.21 m/s

(b) Draw a free body diagram of the object when it is at the top of the circle.  There are two forces on the object: tension force T pulling down and weight force mg pulling down.

Sum the forces in the radial (-y) direction:

∑F = ma

T + mg = m v² / r

T = m v² / r − mg

T = (1.52 kg) (4.21 m/s)² / (0.676 m) −  (1.52 kg) (9.8 m/s²)

T = 24.9 N

The braking force is -400 N

Explanation:

We can solve this problem by using the impulse theorem, which states that the impulse applied on the ferry (the product of force and time) is equal to its change in momentum:

[tex]F \Delta t = m(v-u)[/tex]

where in this problem, we have:

F is the force applied by the brakes

[tex]\Delta t = 65 s[/tex] is the time interval

m = 13,000 kg is the mass of the ferry

u = 2.0 m/s is the initial velocity

v = 0 is the final velocity

And solving for F, we find the force applied by the brakes:

[tex]F=\frac{m(v-u)}{\Delta t}=\frac{(13000)(0-2.0)}{65}=-400 N[/tex]

where the negative sign indicates that the direction is backward.

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Answer:

Parallel forces lie on the same plane and they have lines of action that never intersect each other.

Explanation:

Parallel forces definition is - forces acting in parallel lines.

In physics, parallel and antiparallel forces are forces that are oriented in the same or opposite directions, as described by Newton's third law of motion. An example is the force applied to push a filing cabinet, along with the force of friction opposing it.

Parallel forces refer to forces that are oriented along the same direction, and antiparallel forces are forces that are oriented in opposite directions. An example of parallel or antiparallel forces can be observed in everyday situations such as pushing a filing cabinet. The force applied by a person to push the cabinet and the frictional force that opposes the motion are an example of antiparallel forces. Additionally, Newton's third law of motion illustrates this concept by stating that for every action, there is an equal and opposite reaction, forming a pair of parallel or antiparallel forces.

Choosing a system of interest is crucial when analyzing forces because it determines which forces are considered internal and which are external. For instance, if the system of interest includes both the Earth and a falling object, the gravitational force between them does not cause acceleration of the system as a whole because it is an internal force. However, if the system is only the falling object, then the gravitational force is external, and does not have an equal and opposite force within the system, leading to acceleration.

In physics, forces can sometimes be unified at extremely short distances and high energies, making the distinctions between them less noticeable. While forces like electromagnetic, weak nuclear, and strong nuclear forces appear distinct, they may be different manifestations of a more fundamental force, as suggested by modern physics. This unification is part of the quest for simplicity and understanding the underlying principles governing the forces of nature.

Answer:

The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third one, then they are in thermal equilibrium with each other. Accordingly, thermal equilibrium between systems is a transitive relation.

Answer:

Magnetic materials have many spinning, unpaired electrons.

Explanation:

Any moving electric charge creates a magnetic field, also electrons since they spin and move around the nucleus. However, if two electrons are paired on the same orbital they always spin in opposite directions that causes their magnetic field to cancel out. Even if there are unpaired electrons in some atoms and these atoms act as small magnets, the magnetic field of the neighbouring atoms can have different directions and they also cancel out each other. Only presence of a large number of unpaired electrons in a material can create a significant magnetic field. This is the root part of the definition of magnetic properties of material.

Answer: the correct answer is: Magnetic materials have many spinning, unpaired electrons

Explanation:

I just took the test

Answer:

Explanation:hehehee

Final answer:

The momentum of a 25.1 g rifle bullet traveling at 351 m/sec at a 45-degree northeast direction is 8.8101 kg·m/s, with equal components in the north and east directions.

Explanation:

The momentum of an object is given by the product of its mass and velocity. The momentum π of a bullet can be calculated using the formula π = mv, where m is the mass of the bullet (in kilograms) and v is its velocity (in meters per second). Since the mass is given in grams, you will need to convert it to kilograms by dividing by 1000, making 25.1 g equal to 0.0251 kg.

To calculate the momentum of the 25.1 g rifle bullet traveling at 351 m/sec at a 45 degrees direction, you multiply the mass (0.0251 kg) by the velocity (351 m/s) to get the resulting momentum. Since the question specifies a northeast direction, it implies a vector with equal components in the north and east directions.

Momentum calculation:

π = (0.0251 kg)(351 m/s) = 8.8101 kg·m/s

The momentum vector will have equal components of 8.8101/sqrt(2) kg·m/s in the north and east directions due to the 45-degree angle.

Answer:

C. 37 J

Explanation:

This problem was given with a graph showing that when the spring was elongated to 7 m, the force was approximately 11 N. Seeing as the EPE is calculated by finding the area under the graph and that the area of a triangle is found by using A = 1/2bh, you can see that the givens are b = 7 m & h = 11 N. This means that the the EPE = 1/2 * 7 m * 11 N, which is 38.5N*m. Joules are also represented by N*m so that simplifies to J and seeing as they asked for an approximation, C is the best choice! :)

The testing perspective centers on measuring intelligence with tests, specifically analytical intelligence when examining data trends. Creative is not one of Gardner's Multiple Intelligences, and IQ tests' validity is contested due to potential bias.

The correct answer to the student's question is the testing perspective, which focuses on measuring the amount of intelligence a person has by using intelligence tests.

When examining data for trends, the type of intelligence primarily used is analytical intelligence. Analytical intelligence is the ability to analyze, evaluate, judge, or compare and contrast information.

Among Gardner's Multiple Intelligences, creative is not one of the identified categories; instead, Gardner's intelligences include modalities such as spatial, linguistic, and musical intelligences.

Intelligence can be a broad concept and varies from person to person. Practical intelligence, or street smarts, is related to real-world problem-solving and can be distinct from what traditional IQ tests measure. The IQ test attempts to measure intelligence but has been subject to debate regarding its validity and the scope of abilities it assesses.

Conflict theorists argue that IQ tests may be biased because they may not give children with learning disabilities a fair chance to demonstrate their true intelligence, thereby limiting the understanding of each individual's unique capabilities.

Final answer:

The testing perspective focuses on measuring intelligence with intelligence tests, specifically referred to as the 'testing' perspective. This falls under the study of cognitive psychology, which examines human thinking and the various aspects of intelligence, including analytical ability and the debate over the validity of IQ tests.  So the correct option is C.

Explanation:

The testing perspective focuses on measuring the amount of intelligence a person has by using intelligence tests. The correct answer is C. Testing. This relates to the domain of psychology where the quantification of human intelligence is often conducted through various assessments that aim to gauge different abilities in the areas of problem-solving, reasoning, memory, and other cognitive functions.

When it comes to examining data to identify trends, the type of intelligence predominantly used is analytical intelligence. Analytical intelligence refers to the ability to analyze, evaluate, judge, compare, and contrast information. In Howard Gardner's Multiple Intelligences theory, creative intelligence, while important for some types of problem-solving and innovation, is not listed as one of Gardner’s Multiple Intelligences. His theory includes types of intelligence such as spatial, linguistic, and musical, among others.

Cognitive psychology is the branch that focuses on human thinking. Questions around what intelligence is, how it varies from person to person, and whether or not 'street smarts' are a kind of intelligence, all fall under the study of cognitive psychology. Intelligence Quotient (IQ) tests aim to measure intellectual capabilities, but their validity and the extent to which they truly capture an individual's varied intelligence is a topic of ongoing debate.

Answer: [tex]29.64 \°[/tex]

Explanation:

The expression to calculate the angle [tex]\theta[/tex] of an ideally banked curve in which friciton is not needed is:

[tex]\theta=tan^{-1}(\frac{V^{2}}{r.g})[/tex]

Where:

[tex]V=16.7 m/s[/tex] is the car's velocity

[tex]r.=50 m[/tex] is the radius of the curve

[tex]g=9.8 m/s^{2}[/tex] is the acceleration due gravity

As you may see, this angle does not depend on the mass of the car.

Solving with the given values:

[tex]\theta=tan^{-1}(\frac{(16.7 m/s)^{2}}{(50 m)(9.8 m/s^{2})})[/tex]

Finally:

[tex]\theta=29.64 \°[/tex]

Answer:

(a) -8064 N

(b) 8064 N

Explanation:

(a)

From Newton’s law of motion, Force, F=ma where m is mass and a is acceleration.

Since acceleration is the rate of change of velocity per unit time, then where v is velocity and the subscripts f and I denote final and initial

For the first ball, the mass is 0.28 Kg, final velocity is zero since it finally comes to rest, t is 0.00025 s and initial velocity is given as 7.2 s. Substituting these values we obtain

[tex]F=0.28\times \frac {0-7.2}{0.00025}=-8064 N[/tex]

(b)

For the second ball, the mass is also 0.28 Kg but its initial velocity is taken as zero, the final velocity of the second ball will be equal to the initial velocity of the second ball, that is 7.2 m/s and the time is also same, 0.00025 s. By substitution

[tex]F=0.28\times \frac {7.2-0}{0.00025}=8064 N[/tex]

Here, we prove that action and reaction are equal and opposite

The average force on the first ball is -8,064 N

The average force on the first ball is 8,064 N

The formula for calculating the average force according to Newton's second law is expressed as:

[tex]F=ma\\F=m(\frac{v-u}{t} )[/tex]

m is the mass of the ball

v is the final velocity

u is the initial velocity

t is the time taken

Given the following parameters

m = 0.28kg

v = 0m/s

u = 7.2m/s

t = 250×10⁻⁶secs

Substitute the given parameters into the formula:

[tex]F=0.28(\frac{0-7.2}{0.00025} )\\F=0.28(\frac{-7.2}{0.00025} )\\F=0.28(-28,800)\\F=-8,064N[/tex]

Hence the average force on the first ball is -8,064 N

For the average force on the second ball:

[tex]F=0.28(\frac{7.2-0}{0.00025} )\\F=0.28(\frac{7.2}{0.00025} )\\F=0.28(28,800)\\F=8,064N[/tex]

Hence the average force on the first ball is 8,064 N

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For energy producing reactions they need Hydrogen atoms, heat, and pressure for the experiments.

Explanation:

The initial step of the Hydrogen combination process: a core of Deuterium (2H) is shaped from two protons with the discharge of an antielectron and a neutrino. In the fundamental Hydrogen combination cycle, four Hydrogen cores (protons) meet up to make a Helium core.

An atomic combination response is characterized as the response wherein at least two lighter cores consolidate together to shape heavier cores with the arrival of high measures of vitality.

Combination can possibly give the sort of baseload vitality expected to give power to our urban communities and our enterprises. Maintainability: Fusion powers are generally accessible and almost limitless.

The heart rate that indicates your fitness level is the Resting Heart Rate.

Explanation:

The statement from Welch says that when we practise more and do an exercise harder, then the heart rate at rest would be low. This is the main reason for considering resting heart rates as a good indicator to one’s fitness level. The normal adult heart rate at rest is 60 to 100 bpm (beat per minute).

In general, a lower heart rate means a calmer heart rate and good heart health. For example, for a well-trained athlete, a normal heart rate can be closer to 40 bpm. Our resting rhythm, the measure of how often the heart beats every minute at rest.

Answer:The wave period is the time it takes to complete one cycle. The standard unit of a wave period is in seconds, and it is inversely proportional to the frequency of a wave, which is the number of cycles of waves that occur in one second.

Explanation:

Answer:

v = 640m/s

Explanation:

Answer: 0.26 minutes

Explanation:

Answer: 38,500 feet

Explanation:

look at the attachment where the work is done out

Air is a substance which has the lowest density of about 1.225 kg / m^3.

Explanation:

Explanation:

Magnet

• Magnet :- is an object which attracts pieces of iron, steel etc towards itself.  

Some facts about magnets:-  

• When magnet is freely suspended it always align towards north-south direction    

• Like poles always repel  & opp. poles attract each other.  

• Magnet always exist as dipole    

• Two poles can never be separated : if we try to cut it then still both the poles will exist even ina small piece of magnet .it automatically develops the lost polarity

Magnet always develop certain area around it where its effect can be felt ie. magnetic field.  

MAGNETIC Field  

is studied by drawing imaginary lines called magnetic lines of forces.  

  Characteristics.  

• They always originate from North pole & terminate at South pole. This shows that if north pole was free is move it would have mvre towards south pole.  

•Place where they are closer indicate strong M. field i.e. at poles.  

•Mag. Field lines gives the direction of magnetic force.  

•Two magnetic lines will never intersect each other as they give direction of force & force can’t have 2 direction at a time.  

This is what that happens in  magnetic materials .

Non magnetic materials

Types of magnetic materials

Soft magnetic materials (e.g. iron) have domains that easily move into line when the metal is placed in a magnetic field but as soon as the field is removed the domains take on a random pattern again. It returns to being unmagnetized straight away.

Hard magnetic materials (e.g. steel) have domains that do not easily move into line when the metal is placed in a magnetic field, a strong field is needed for some time, but then, when the field is removed the domains retain the magnetic pattern. The metal stays magnetic for a long time.