the magnetic field strength at the north pole of a 2.0- cm -diameter, 8- cm -long alnico magnet is 0.10 t . to produce the same field with a solenoid of the same size, carrying a current of 2.0 a , how many turns of wire would you need?

The work done by the force on the 35 Joule.

Work in physics is the energy that is transferred to or from an item when a force is applied along a displacement. In its simplest form, it equals the product of the force's magnitude and the distance traveled for a constant force directed in the direction of motion.

Work = force . distance. In units, Joules = Newtons x meters.

Work = 10.4 + (-5)1

Work = 35 Joule

The work done by the force on the 35 Joule.

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53.64 m is the shortest distance you can stop an automobile by locking the brakes.

The resistive force of friction (Fr), which pushes the objects together, is divided by the normal or perpendicular force (N), which pushes them apart, to produce the coefficient of friction (fr), which is a numerical value. The following formula represents it: fr = Fr/N.

Given;

kinetic friction coefficient is 0.80.

automobile's speed, u = 28.7 m/s

Applying the following equation, we can determine the shortest distance over which an automobile can be stopped by locking the brakes:

v² = u² + 2ax

First, we establish a;

the second law of motion, Newton

v² = u² + 2ax

First, we establish a;

the second law of motion, Newton

F = ma

F is the amount of kinetic friction preventing the car from moving

-F = ma

but, -F = -μN

-μN = ma

-μmg = ma

-μg = a

- 0.8 x 9.8 = a

-7.84 m/s² = a

Add the value of a to the equation above now

v² = u² + 2ax

F = ma

F is the amount of kinetic friction preventing the car from moving

-F = ma

but, -F = -μN

-μN = ma

-μmg = ma

-μg = a

- 0.8 x 9.8 = a

-7.84 m/s² = a

Add the value of a to the equation above now

v² = u² + 2ax

When the car comes to a stop, its final speed is v = 0.

0 = 28.7² + 2(-7.84)x

0 = 823 - 15.68x

15.68x = 823

x = 823 / 15.68

x = 52.48 m

Therefore, 52.48m is the shortest distance you can stop an automobile by locking the brakes.

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I would say D

Explanation:

The strength of gravity between two objects depends on two factors: the masses of the objects and the distance between them.

Option d is correct.

2 spring tides and 2 neap tides will be experienced by the tide-recording station in a given month.

Tides are the rise and fall in sea levels brought on by the combined effects of the Moon's (and the Sun's, to a much lesser extent) gravitational pulls, as well as by the Earth and Moon circling one another. The monthly tides on Earth are influenced by the gravitational pull of the moon and the sun together.

The solar tide adds to the lunar tide when the sun, moon, and Earth are aligned (during a new or full moon), resulting in extremely high tides and extremely low tides, both of which are known as spring tides.

The solar tide largely cancels out the lunar tide one week later when the sun and moon are at right angles to one another, resulting in the mild tides known as neap tides. Two sets of spring tides and two sets of neap tides take place twice each lunar month.

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This statement is True. The magnitude of the frictional force is always equal to μkn.

Frictional force refers to the pressure generated via two surfaces that touch and slide toward every other. a few factors affect the frictional pressure: those forces are specifically stricken by the surface texture and the amount of pressure impelling them together.

Friction can gradually things down and prevent desk-bound matters from shifting. In a frictionless global, extra gadgets would be sliding about, clothes and footwear might be difficult to keep on and it might be very difficult for human beings or vehicles to get shifting or change direction.

using lubricants such as oil or grease can reduce the friction between the surfaces. by using polishing the floor, sprucing makes the floor easy and friction may be decreased.

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Answer:

Any amount of force

Explanation:

Any amount of force will overcome inertia, assuming that overcoming inertia means changing the velocity of an object. Looking at Newton's 2nd law: F=m*a, any force applied to a constant mass must effect an acceleration.

If overcoming inertia entails altering an object's velocity, then any amount of force will do it. By applying a force on a mass that is constant, as stated by Newton's second law: F=m*a, an acceleration results.

You only need to know the equation F=ma to comprehend how force overrides inertia; take note that a stands for acceleration, which is the change in speed. Therefore, any net force will cause some acceleration, regardless of how much mass there is or how little force there is. All objects have the propensity to resist changes in motion, which is known as inertia. Unless a force acts on a moving object to modify its speed or direction, inertia causes it to continue traveling at the same velocity (speed and direction). Additionally, it keeps an object in rest still.

The "sum of the product of mass" of each particle with the "square of its distance from the axis of rotation" is the formula for the moment of inertia.

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160000 kgm/s is the impulse of the car. ​

J=mΔv

I= impulse

m= mass= 2000kg

Δv=  change in velocity= 80 km

J=mΔv

I= 2000kg×80 km/s

I=160000 kgm/s

The concept of impulse is used to describe how a net force affects an item (a kind of "moving force"). Impulse is denoted by the letter J.  The average net force acting on an item over time is calculated as an impulse. The force-time integral is J = Ft. The vector quantity of impulse is J = F dt (since force is a vector and time is a scalar).

Theorem of Impulse-Momentum According to the impulse-momentum theorem, an object's change in momentum equals the impulse that was delivered to it. J = ∆p The newton second is the SI unit for impulse. The kilogram meter per second is the SI unit for momentum. These momentum and impulse units are the same.

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If two objects, one with a mass of 1000 kg and another with a mass of

2500 kg are separated by a distance of 100 m, and the force between

them is 1.667 * 10⁻⁸ N.

The force, F, between two masses separated by a distance, d, is given by the formula below:

F = Gm₁m₂ / d²

where;

G is gravitational constant = 6.67 * 10⁻¹¹ Nm²/kg²

m₁ is the mass of the first object = 1000 kg

m₂ is the mass of the second object = 2500 kg

d is distance = 100 m

The force will then be;

F = 6.67 * 10⁻¹¹ * 1000 * 2500 / 100²

F = 1.667 * 10⁻⁸ N

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The correct answer of Brewster’s angle is 48.8 degrees for light traveling in water that is reflected from crown glass.

What is light's Brewster angle as it travels through water?

Brewster's law is the name of this equation, and the angle it defines is known as Brewster's angle. Brewster's angle for visible light is around 56° for a glass medium in air (n2 = 1.5), while it is roughly 53° for an air-water interface (n2 = 1.33)

The inverse tan of n 2 over n 1 is what is known as Brewster's Angle. Therefore, 48.8 degrees is the inverse tan of 1.52 divided by 1.33.

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0.44 is the coefficient of friction between the box and the floor.

F=μN

F= force

N= Normal reaction

μ=coefficient of friction

F=μN

μ=F/N

μ=34.2/7.87 ×9.8

μ= 0.44

The ratio of the normal force pushing two surfaces together to the frictional force preventing motion between them is known as the friction coefficient. Usually, the Greek letter mu is used to indicate it .N is the normal force, and F is the frictional force, hence F = N/N.

Due to the fact that both F and N are measured in units of force, the coefficient of friction has no dimensions (such as newtons or pounds). The coefficient of friction can have a variety of values for both static and dynamic friction. Static friction occurs when an object encounters friction that resists any applied force, keeping the object at rest until the static frictional force is released. In kinetic friction, the frictional force resists the motion of the object.

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The mass will remain same of 3.15g.

Mass is used in physics to express inertia, a fundamental function of all be counted.

Essentially, it's far a mass of depend's resistance to converting its direction or velocity in reaction to the application of a pressure. The exchange that an implemented pressure produces is smaller the extra mass a body has.

The kilogram, the unit of mass within the international gadget of units, corresponds to 6.62607015 1034 joule seconds the usage of Planck's constant (SI). One joule is produced with the aid of multiplying one kilogram via one square meter in keeping with second.

The kilogram is decided by using exact measurements of Planck's regular given that the second and the meter have formerly been defined in phrases of different physical constants.

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The total momentum before the person moves is zero when he walks in a straight line to the opposite end of the raft.

According to Newton's second rule of motion, the rate of change of body's momentum is equal to the net force acting on it. Momentum changes with frame of reference, but it is a conserved quantity in any inertial frame, which indicates that if a closed system is not impacted by external forces, its total linear momentum remains constant.

Because the initial momentum was zero, the final momentum must also be zero. If the boy has momentum in one direction, the boat must have momentum in the other. The total momentum before the person moves is zero when he walks in a straight line to the opposite end of the raft

As a result, the boat moves backward.

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Answer:

2.5 m/s

Explanation:

Please mark me as brainly

formula : a = v-u

t

that is : acceleration = final velocity - initial velocity

time

so answer goes like this :

a = 25 - 10

6

a = 15

6

a = 2.5 m/s

Only twice as far away from the solar system as the Alpha Centauri system, which is the closest star system to us beyond the Sun, it is 8.6 light-years away.

The Greek word that inspired its name means "sparkling" or "scorching." At a speed of just over 186,000 miles per second, light moves through space. Light from the moon's surface must travel more than one second (about 1.3 seconds) to reach Earth because the moon is only around 250,000 miles away.

Time = 8.61 years = 8.61 8760

= 75423.6 hours

Speed of light = 3108 m/s

= 3108 3.6 = 1080000000 Km/h

Dimension =?

Distance x time speed

75423.6 / 1080000000 = distance

multiply by cross

Distance = 75423.6 1080000000

Distance = 8.15*10¹³ kilometers

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Yes, This icosahedrons geometrical form can be distorted as a lower pyritohedral symmetry.

An icosahedron is a polyhedron with 20 faces. it has no.of edges=30and no. of  Vertices=12.it is a geometrical shape.

A 3D spherical symmetry group with the symbol B3/2 is called pyritohedral symmetry, also referred to as pyritic symmetry. The pyritohedral icosahedron and its dual pyritohedron make up this symmetry group.

Snub octahedrons, snub tetratetrahedrons, snub tetrahedrons, and pseudo-icosahedrons are all names for conventional icosahedrons that have been deformed or marked up as having a lower pyritohedral symmetry. An alternating truncated octahedron can be seen in this.

Hence , This icosahedrons  geometrical form can be distorted as a lower pyritohedral symmetry

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The speed of the fighter jet the instant after it launches the missile is 352.36 m/s.

The final speed of the fighter jet is the speed of the fighter jet after launching the missile.

Apply the principle of conservation of linear momentum;

m₁u  +  m₂u   =  m₁v₁   +   m₂v₂

where;

u(m₁ + m₂) = m₁v₁ + m₂v₂

365(12,652 + 190) = 12,652v₁  +  190(1207)

4,687,330 =  12,652v₁  + 229,330

12,652v₁ = 4458000

v₁ = 4458000 / 12,652

v₁ = 352.36 m/s

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As the age of the car increases by 1 year, the value of the car decreases by 7%.

What is velocity?

Velocity is the directional velocity of a moving object, observed from a given frame of reference and indicating the rate of change of position measured at a given time reference (eg 60 km/h northward). Velocity is a fundamental concept in kinematics, a branch of classical mechanics that describes the motion of bodies.

Velocity is a physical vector quantity. The scalar absolute value (magnitude) of velocity is called velocity, and its magnitude is a consistent derived unit measured in the SI (metric) system as meters per second (m/s or m⋅s−1). For example, "5 meters/second" is a scalar, but "5 meters/second east" is a vector. An object is said to be accelerating if its velocity, direction, or both change.

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Due to its position, an object has the ability to store energy. The initial energy that is stored in the system is provided by the tension in the string.

The ability to exert an force that causes an item to move is what is meant by the definition of energy as the "power to accomplish work." Even though the definition is unclear, the meaning is clear: energy is simply the force that moves things. Potential energy and kinetic energy are the two categories of energy.

Because it is a fundamental human requirement, energy plays a significant role in our daily lives. Our human-made structures are not only heated by energy, but also cooled by it. Even lifting a finger requires energy, as does getting out of bed and going outside.

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Therefore, the ball's speed is 2.24 m/s 2.24 m/s. The weight of the ball caused by the earth's gravity is the force exerted on it at any point along the journey.

Take a look at the ball's free-body diagram from both its top and bottom positions in the circle. When a body is suspended from items like chains, cables, strings, etc., tension is simply the drawing force at work on the body. The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.

Centrifugal force in the string is given by

F= rmv2

v2= mFr

​v2= 0.25/25×1.96

​ =196

v= 196

​ =14m/s

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3.710^-15 joule  is the maximum energy of the photons

voltage= 23.5 = 23500 V

q= 1.6 × 10^-19 coulombs

Energy= qV

E= 3.710^-15 joule

Energy is the ability to perform work in physics. Different shapes, such as potential, kinetic, thermal, electrical, chemical, radioactive, etc., may be assumed by it. Other instances of energy being transmitted from one body to another include heat and work. Energy is always distributed after it has been transferred in accordance with its type. Thus, heat transfer could result in thermal energy, whereas work could result in mechanical energy.

Motion is a trait shared by all forms of energy. For instance, if a body is moving, it possesses kinetic energy. Due to the object's design, which integrates potential energy, a tensioned object, such a spring or bow, has the ability to move even when at rest.

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The answer is ball swings towards passenger side. correct option is (B).

Bernoulli's equation = P+1/2ρv^2+ ρgh=Constant,

so

P1+1/2ρv1^2+ ρgh1= P2+1/2ρv2^2+ ρgh2

(v1^2-v2^2)=g(h2-h1)

So from the formula we can see that the change in velocity depends on the height difference, and the wind blows the ping pong ball will move which will make a height difference and hence the ball will swing.

What is Bernoulli's equation-

According to the Bernoulli's principle of fluid dynamics, a fluid's speed increases at the same time as its static pressure or potential energy decreases.

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The correct answer is it will continue to be zero in case of emf when the current is constant at its higher value.

What is the relation emf and current?

The term "induced electromotive force" (EMF) refers to the potential difference that is produced when a coil's magnetic flux changes. The pace at which electrons or ions flow in a closed circuit is known as current, in contrast.

The emf across an inductor is zero whenever the current is constant(unchanging), large or small.

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Answer:

Explanation:

Given:

ΔV = 300 km/h = 300 000 m / 3 600 s ≈ 83.3 m/s

Δt = 20 s

_____________

a - ?

The acceleration:

a = ΔV / Δt = 83.3 / 20 ≈ 4.2 m/s

Resistivity is the measure of an electrical conductor's resistance with a unit cross-sectional area and unit length. Any material's resistance can be used to distinguish it from other materials and to assess how well they carry electric currents. High resistance suggests little conductivity.

"The wire's resistivity changes, but its resistance does not,"

Stretching a copper wire causes its length to rise and its diameter to contract, which raises the wire's resistance but keeps the material's and temperature's resistivity constant.

The resistance of current in a wire is inversely related to the cross-sectional area of the wire and directly proportional to its length. This is,

R = (L rho)/A

Where

L stands for wire length.

A is the wire's cross-sectional area.

Resistivity, or rho, is a proportionality constant that is influenced by the wire's quality.

In light of this, resistance and resistivity are connected by:

proportionality constant based on the composition of the substance.

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The transformer is step-up because output voltage has higher value.

We need to know about the transformer to solve this problem. Transformer is a device that can increase or reduce the voltage. The changed voltage depends on the current and number of coil turns. It can be written as

Vi / Vs = Ni / Ns = Is / Ii

where Vi is input voltage, Vs is output voltage, Ni is primary turn, Ns is secondary turn, Is i output current and Ii is input current.

From the question above, we know that

P = 78 W

Vs = 14 V

Ii = 34 A

Find the input voltage by using the power of transformer

P = Ii . Vi

78 = 34 . Vi

Vi = 2.29 V

As we know the input voltage is lower than the output voltage. It means that the transformer is included to step up transformer.

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Answer: index of refraction (air) = 1.0; index of refraction (water) = 1.33.

Explanation:

The solid sphere goes the least distance up its incline.

How do you define the moment of inertia of a body?

                                                         I = L/ω

I = inertia

L = angular momentim

ω = angular velocity

In the question it is given that a solid sphere, solid cylinder, a spherical shell and a hoop all having the same mass(m) , radius(r) and linear center of mass speed(v) roll up identical inclines

Since all the bodies have same mass, radius and linear speed as such according to conservation of energy for every object,

Rotational Energy + Kinetic Energy = Potential Energy

Iω^2/2 + mv^2/2 = mgh

where, the symbols represent-

I = moment of inertia

ω = angular speed

v= linear speed

m = mass

h = height

We know the

I for solid sphere = 2mr^2/5

I for solid cylinder = mr^2/2

I for spherical shell = 2mr^2/3

I for hoop = mr^2/2

As per the given informations kinetic energy of all bodies is same therefore, on the value of I or the moment of inertia depends which body will cover the highest or least distance up its incline

I for solid sphere is minimum among all the given bodies and thus it will attain the least distance.

Hence, the solid sphere goes the least distance up its incline.

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This atom of oxygen need two electrons in its valence shell to satisfy the octet rule.

The octet rule is a rule of thumb in chemistry that reflects the theory that main group elements have eight electrons in their valence shells and tend to bond in the same electronic configuration as the noble gases. increase. The octet rule states that an atom should only have 8 electrons in its full outer shell.

The electronic configuration of oxygen is 1s²2s²2p⁴. Two electrons are required for oxygen to reach the noble gas configuration. According to the octet rule, an oxygen atom must be bonded twice. An O2 molecule has two atoms. That is, two atoms of the same element are bonded in pairs.

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Answer:

its 6 the other person was wrong

Explanation:

The Jendrassik maneuver (JM) is a method for enhancing sluggish tendon-tap during the examination. The tendon tap reflex is used to assess the state of the monosynaptic reflex through the spinal cord.

This is due to enhanced gamma efferent discharge to the muscle spindle. Protective measures for the muscles, in order to prevent tearing that can occur due to vigorous movement. Once the muscle spindle is stretched, the impulse is sent back to the muscle very quickly and protects it from being pulled forcefully or beyond its normal range of motion.

The Jendrassik maneuver is a clinical maneuver in which the patient clenches the enamel, flexes each set of arms right into a hook-like form, and interlocks the one's sets of arms together. The tendon beneath the patient's knee is then hit with a reflex hammer to elicit the patellar reflex.

The Jendrassik maneuver may also exaggerate spinal reflexes including the patellar reflex. explain. the Jendrassik maneuver reduces activity in normal brain stem descending inhibitory pathways that manipulate spinal reflex neurons. a discount in inhibition on the spinal level may additionally lead to myotatic reflex responses.

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The kinetic energy the ball will have just before hitting the ground is 0.196 kJ.

Define kinetic energy in your words?

The energy that an object has because it is moving is known as kinetic energy in physics.

In other words it can be defined as the amount of effort that is required to accelerate a body of a specific mass from rest to its specified velocity is termed as kinetic energy.

The following informations are given in the question,

Mass of the ball, M = 4 kg

Height of the ledge, S = 5 m

Initial velocity of the ball, u = 0 m/s (at rest)

From the third equation of motion, we have

v^2 = u^2 + 2a × S

      = 0 + 2 × 9.8 × 5

      = 98

v = √(98)

  = 9.889 m/s

  = 9.9 m/s

Kinetic energy is found out using the formula, E = 1/2 × mass × v^2

Since the initial kinetic energy of the ball is 0 as its initial velocity is 0 or the body was at rest, therefore,

The final kinetic energy of the ball,

Ef = 1/2 × 4 × 9.9^2

   = 196 J

   = 0.196 kJ

Hence, the kinetic energy the ball will have just before hitting the ground is 0.196 kJ.

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