How many light years in diameter have scientists estimated that our milky way galaxy is?

When you keep an object in front of a concave mirror, an enlarged image of the object is formed when it is kept close to the mirror and an inverted image of the object is formed when it is kept at a distance. A convex mirror always forms a small and an erected image of the object.

Concave mirrors are spherical mirrors with a reflecting inner surface. Convex mirrors are spherical mirrors with a reflecting surface on the outside.

A concave mirror, also known as a converging mirror, has an inwardly depressed reflecting surface (away from the incident light). Light is reflected inward to a single focal point via concave mirrors.

Convex mirrors are curved mirrors with a reflecting surface on the outside. (Vex is an acronym meaning protruding).

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The inverse of Janine's equation is r = -120/(t - 120).

An equation is described as a formula that expresses the equality of two expressions, by connecting them with the equals sign.

In algebra, an equation is a mathematical statement that establishes the equality of two mathematical expressions.

The categories for equations are either identities or conditional equations.

For each potential value, the variables provide an identity. Only certain combinations of the values for the variables allow a conditional equation to hold true.

In order to  find the inverse of Janine's equation, we will to solve for r in terms of t.

First, we can rearrange the equation to get

t - 120 = 1/r.

divide both sides of the equation by 1/r to get

t/r - 120/r = 1.

divide both sides of the equation by -120/r to get

r = -120/(t - 120).

Therefore, the inverse of Janine's equation is r = -120/(t - 120).

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Answer: R=120t/120-t

Explanation: edmentum/plato :)

Yes, there will be more potential energy that can be stored by moving against the magnetic force near the magnet.

If you move the magnetic field against the magnetic force of the magnet, the movement compresses the magnetic field lines and increases the potential energy. Potential energy increases when the charge moves in the opposite direction to the electric force. For example, when two negative charges approach each other. Similarly, magnetic potential energy is the potential energy that a magnetic body has due to the magnetic force of another magnet. The stored energy is broken down and replaced with kinetic energy. So if two magnets with opposite poles are oriented toward each other (from North Pole to South Pole), the energy stored in the magnetic field will decrease as they move closer together.

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the answer is 8.85 m/s.

step by step explanation:

m = 85 kg

h = 4 m

Ep=m*g*h

Ep=85kg*9.8m/s²*4m = 3332 J (joules)

Ep=1/2*m*v²

3332=1/2*85kg*v²

3332= 42.5*v²

v² = 78.4

v = 8.85m/s

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the correct question is -

Tarzan's mass of 85 kg swings down from a tree limb on the end of the 20 m vine. His feet touch the ground 4.0m below the limb how fast is Tarzan moving when he reaches the ground?

​

Answer:

Work done= 85000 J

Explanation:

Work done = mass x acceleration due to gravity (constant at 10) x height

W= 500 x 10 x 12+5.0

W= 500 x 10 x17

W= 85000 J

500 kg of water are raised by the water pump from a 12 m deep well onto a reservoir that is 5.0 m above the earth, and this process requires -34,335 J of work.

In physics, work is defined as the energy transferred to or from an object by means of a force acting on the object, causing it to move in a certain direction. Work is a scalar quantity and is represented by the symbol "W". The magnitude of work is given by the product of the force acting on an object and the displacement of the object in the direction of the force.

In other words, work is done when a force acts on an object and causes it to move a certain distance in the direction of the force. The amount of work done is determined by the magnitude of the force, the displacement of the object, and the angle between the force and the displacement.

The SI unit of work is the joule (J), which is defined as the work done when a force of one newton (N) is applied over a distance of one meter (m) in the direction of the force.

Here in the Question,

The work done by the water pump is equal to the product of the force applied by the pump and the distance over which the force is applied. In this case, the force applied by the pump is the weight of the water being lifted, and the distance over which the force is applied is the vertical distance from the bottom of the well to the top of the reservoir.

First, we need to calculate the weight of the water being lifted:

mass of water = 500 kg

acceleration due to gravity = 9.81 m/s^2

weight of water = mass of water x acceleration due to gravity

= 500 kg x 9.81 m/s^2

= 4,905 N

Next, we need to calculate the vertical distance over which the force is applied:

vertical distance = height of reservoir - depth of well

= 5.0 m - 12 m

= -7.0 m (negative sign indicates that the direction of the force is opposite to the direction of the displacement)

The work done by the pump is given by:

work = force x distance x cos(theta)

where theta is the angle between the force and the displacement. In this case, theta is 180 degrees, since the force is acting in the opposite direction to the displacement.

So, the work done by the pump is:

work = force x distance x cos(theta)

= 4,905 N x (-7.0 m) x cos(180 degrees)

= -34,335 J

The negative sign indicates that the work done by the pump is negative, which means that the pump is actually doing work against the gravitational force. This is because the water is being lifted from a lower level to a higher level, and the pump has to overcome the gravitational force acting on the water in order to do so.

Therefore, the work done by the water pump in raising 500 kg of water from a 12 m deep well onto a reservoir 5.0 m above the ground is -34,335 J.

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30 Coulombs / 0.1 seconds = 300 Amps

The average current during this time is calculated by dividing the amount of charge (in Coulombs) by the amount of time (in seconds) it takes to lower the charge to ground. So, in this case, it is 30 Coulombs divided by 0.1 seconds, which is equal to 300 Amps.

The direction of a nail does not have any relation to a compass.

A compass is a device that is used to determine direction, typically with respect to the Earth's magnetic field. It is commonly used for navigation, as it can help a person determine which way is north, south, east, or west.

The direction of a nail, on the other hand, refers to the orientation of the nail in relation to the surface it is being driven into. For example, a nail might be driven in a straight, vertical direction, or it might be driven at an angle.

Hence, The direction of a nail is determined by the person driving the nail, and it does not have any relation to a compass.

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Scientists have discovered a pill that, if taken once a day, can reduce chest pains, then : The committee would conduct few trials with actual patients and then evaluate the drug's success rate.

All drugs must go through the pipeline of discovery, investigation, clinical trials, and FDA approval before being marketed. This activity reviews federal regulations of medication development and highlights the interplay between FDA, drug manufacturers and clinical researchers.

Drugs have to undergo laboratory and animal testing to answer basic questions about safety and drugs are also tested on people to make sure they are safe and effective.

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The explanation for the extra empty white square in the bottom figure is that one of the shapes in the top figure is larger by one square than the corresponding shape of the same colour in the bottom figure.

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Preston take 6.5 hours to paint 812.5 square feet.

To calculate the time it takes Preston to paint 812.5 square feet, we can use the equation t = (d/r) where t is the time it takes, d is the distance or in this case the area of the wall, and r is the rate or in this case the area painted in an hour.

Step 1: Calculate the rate of painting per hour

375 square feet ÷ 3 hours = 125 square feet per hour

Step 2: Calculate the time needed to paint 812.5 square feet.

Preston can paint in an hour. So, in this case,

                        t = (812.5 / 125) = 6.5 hours.

i.e. 812.5 square feet ÷ 125 square feet per hour = 6.5 hours

Therefore, it would take Preston 6.5 hours to paint 812.5 square feet.

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Answer:

Below

Explanation:

Water that boiled off =   .080 - .071 = .009 kg  = 9 gm

Your question did not state the INITIAL temperature of the water

   THIS answer will assume it was at its boiling point

25200 J / 9 g  =  2800 J / g  = heat of vaporization

A container of hydrogen sulfide gas has a pressure of 35,650 pa. It is equivalent to 267.4 Torr.

When molecules collide with one another or the walls of a container, pressure is produced in a gas.

Gas pressure is produced by the interaction of gas molecules with an object's surface. Any surface with a sizable area is vulnerable to several impacts quickly, even though each one only involves a tiny amount of power, which might result in a high pressure.

All directions of pressure are equally provided by gaseous molecules.

The SI pressure unit is called Pascal (Pa).

The pressure of hydrogen sulfide gas in Pa = 35650 Pa.

The conversion factor between Pascal and torr is as follows:

1 Torr = 133.322 Pa

Use the conversion factor and determine the pressure of hydrogen sulfide gas in torr as follows:

1 Pa = [tex]\frac{1}{133.322}[/tex] Torr

1Pa=0.00750Torr

35,650Pa= 35,650x0.00750 Torr

35,650Pa= 267.4Torr.

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The potential energy of the products is lower than the potential

energy of the reactants. Hence, option (C) is correct.

The energy that is stored in a reaction and used to help a compound break its bond when a chemical reaction is taking place.

In the presence of activation energy, the bonds in the reactants in the reaction mixture split, releasing energy and forming the product.

Hence, the potential energy of the products is lower than the potential

energy of the reactants. Option (C) is correct.

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The one-dimensional diffusion equation or Fick's second law is the name of this equation. For the geographically and temporally variable concentration, it is solvable.

A diffusion explanation is what?

The movement of molecules along a concentration gradient is known as diffusion. It is a significant process that all living things go through. Diffusion facilitates the flow of materials into and out of cells.

Which definition of diffusion is the best?

Diffusion is the movement of molecules from a region where they are more concentrated to one where they are less concentrated. Therefore, "Movement of molecules from a region of their greater concentration to a region of their lower concentration" is the right response.

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b. The moment it emerges from the barrel. less than or equal to the bullet fired . This is because the sine or cosine modulus of any angle to be less than or equal to one.

According to Newton's Third Principle of Motion, every action has a corresponding and opposing reaction. A bullet shot from a gun experiences force from the weapon alone, which propels it ahead. As it goes rearward, the bullet exerts an equal and opposing force on the rifle.

Actually, each of the three events will impact in a different way. The item without air would be the first to impact drag, therefore any fired or lost bullets.

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A chain reaction can be set up if the neutrons produced by one fission strike other U-235 nuclei if the three neutrons produced by the fission may hit other nuclei of uranium 235, causing the process to repeat.

This is referred to as a chemical reaction or other process in which the products themselves promote or spread the reaction.

The products which are yielded initiate further processes of the same kind and in this scenario a chain reaction can be achieved if three neutrons produced by the fission may hit other nuclei of uranium 235 which will lead to a repetition of the process.

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When the first hockey puck comes to rest after the collision then the conservation of momentum holds and the total final momentum of the system is 23.18 m/s.

Applying the law of conservation of momentum,

we get,

m1v1i + m2v2i= m1v1f + m2v2f

0.17 (15) + 0.11 (0) = 0.17 (0) + (0-11) (V₂f)

0.17 x1500+ 0.11 V2f Vaf 0.17x15 0.11

V₁f =23.18 m/s

A collision between bodies in which the total kinetic energy of the bodies is conserved. Elastic collisions, such as the collision of a rubber ball on a hard surface, result in the reflection or "bouncing" of bodies away from each other.

In a perfectly elastic collision, no energy is turned into thermal energy internal to the bodies, and none is spent on permanently deforming the bodies or radiated away in some other fashion.

A collision between bodies in which the total kinetic energy of the bodies is not conserved. Inelastic collisions, such as the collision of two balls of clay, tend to result in the slowing and sometimes the sticking together of the colliding bodies.

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The system's total final momentum is 2.54 kg m/s m/s when the first hockey puck comes to rest following the collision, proving that momentum conservation persists.

Utilizing the principle of momentum conservation,

we get,

[tex]M_{1} V_{1}i +M_{2} V_{2}i =M_{_{1} } V_{1}f +M_{2} V_{2} f[/tex]

0.17 (15) + 0.11 (0) = 0.17 (0) + (0.11) (V₂f)

[tex]V_{2}[/tex]f =23.18 m/s

p = mv

p = 0.11*23.18 kg m/s

p = 2.54 kg m/s

a collision in which both bodies maintain their full internal kinetic energy. Elastic collisions cause bodies to reflect or "bounce" away from one another, like when a rubber ball strikes a hard surface.

When two perfectly elastic bodies collide, no energy is converted into internal heat energy and no energy is used to permanently distort the bodies.

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When the initial velocity were quadrupled, the block would slide and stops at a distance of 30.4 m

Using equation of motion

v² = u² + 2as

Where:

v = final velocity

u = initial velocity

a = acceleration / deceleration

s = distance

In the given problem:

v = 0 (since the block finally stopped)

u = 2.5 m/s

s = 1.9 m

Plug these parameters into the equations:

0 = 2.5² + 2a x 1.9

a = - 1.64 m/s²  (minus sign means deceleration)

Assuming the same force applied, but now the initial velocity were quadrupled. Hence,

u = 4 x 2.5 = 10 m/s

v² = u² + 2as

0 = 10² + 2 x (- 1.64 ) x s

s = 30.4 m

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The force pushing the 5kg rifle back when a 5g bullet is fired from it is 25*10^5N.

The mass of the bullet m= 5g.The constant force acting on the bullet F=2500N.So the acceleration of the bullet a=F/m ,a=2500/0.005 =5*10^5m/s^2.

According to Newton's law of motion, each action force has an equal and opposite reaction force.

Now the force pushing the riffle in the backwards direction  F1=M*(F/m). Now the mass of the rifle M=5kg. So the force acting on the riffle , F1=5*(2500/0.005)=25*10^5 N.

His third law argues that there is an equal and opposite response to every action (force) in nature. When object A pulls on item B, object B pulls back on object A with an equal and opposing force. In other words, interactions lead to forces.

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The moment of inertia of the cylinder with radius 0.120m mounted on a frictionless stationary axle for rotation about the axle is 0.026kgm^2.

At the initial time the body was at rest, so the initial angular velocity wo=0. According to the equation , theta -theta o = 1/2×a0 ×t +wo×t.

Now when the function for angular displacement (θ−θ0) = f(t^2) ( in radians ) is drawn the data lies close to a straight line, the slope is equal to =16.0 rad/s^2.

So the value of angular acceleration a0 is, k=1/2×a0 ,a0=2×k , a0=32 rad/s^2.

In rotational motion of the cylinder , I×a0= Tz ,I×a0=F×r , I= (F×r)/ a0 ,I=(7×0.12)/32, I= 0.026 kgm^2.

So the moment of inertia of the cylinder for rotation about the axle is 0.026kgm^2.

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In this situation, the normal force on the box of cereal would be equal to its weight, or 3.8 N. Correct answer: letter A.

This is because the box of cereal is at rest on the kitchen counter, meaning that the normal force exerted by the counter on the box is equal and opposite to the gravitational force exerted on the box by the Earth.

This means that the net force on the box is 0 N, and so the normal force must be equal to the box's weight in order to balance out the gravitational force and keep the box at rest.

The calculation to determine the normal force on the box of cereal is relatively straightforward. First, we need to calculate the weight of the box of cereal, which is equal to its mass multiplied by the acceleration due to gravity (9.8 m/s2). In this case, the weight of the box of cereal is 3.8 N.

As the box is at rest on the kitchen counter, the normal force exerted by the counter on the box must be equal and opposite to the gravitational force. This means that the normal force on the box of cereal is also 3.8 N, which is equal to its weight.

A box of cereal with a weight of is at rest on the kitchen counter. What is the normal force that the counter exerts on the box of cereal?

A) 3.8 N

B) 0.39 N

C) 6.0 N

D) 37 N

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Answer:

Approximately [tex]0.0263\; {\rm m}[/tex] (assuming that [tex]g = 9.81\; {\rm N \cdot kg^{-1}}[/tex].)

Explanation:

The weight of this [tex]m = 1.50\; {\rm kg}[/tex] box is:

[tex]\begin{aligned}(\text{weight}) &= m\, g \\ &= (1.50\; {\rm kg})\, (9.81\; {\rm N\cdot kg^{-1}}) \\ &\approx 14.715\; {\rm N}\end{aligned}[/tex].

The tensions in the two springs, combined, is equal to the weight of this box.

To determine how the weight is split between the two springs, consider Hooke's Law. By Hooke's Law, the tension in the spring is proportional to the distance (displacement) by which the spring is stretched:

[tex](\text{tension}) = (\text{spring constant})\, (\text{displacement})[/tex].

The spring constant of the two springs in this questions are equal. For the springs to hold the box side-by-side, their displacements also need to be equal. Hence, the tension in the two springs would be the same.

Therefore, the weight of the box would be evenly split between the two springs. The tension in each spring would be:

[tex]\begin{aligned}\frac{(\text{weight})}{2} &= \frac{14.715\; {\rm N}}{2} \approx 7.3575\; {\rm N}\end{aligned}[/tex].

To find the displacement of the spring, divide the tension in each spring by the spring constant:

[tex]\begin{aligned}(\text{displacement}) &= \frac{(\text{tension})}{(\text{spring constant})} \\ &\approx \frac{7.3575\; {\rm N}}{280\: {\rm N\cdot m^{-1}}} \\ &\approx 0.0263\; {\rm m}\end{aligned}[/tex].

The work done when 1 mole of a gas is allowed to expand freely in vacuum is 0 J.

Given that,

Number of moles n = 1.

Gas expands in vacuum and so it is a case of free expansion. It means that,

P ext = 0 and it is an irreversible process.

Mathematically, W = - P ext ( v₂ - v₁)

And its value is zero, W = 0.

In a free expansion, gas expands in vacuum and the molecules move freely and gas expands against no force.

Thus, the required work done when 1 mole of gas is allowed to expand freely is 0 J.

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1 cycle per second

The unit of frequency is Hertz (Hz). One Hertz is equal to one cycle per second. The frequency of a periodic phenomenon (such as a wave, oscillation, or rotation) is a measure of the number of cycles that occur within a given time period. The higher the frequency, the more cycles that occur in a given time period.

For example, if a wave has a frequency of 10 Hertz, it means that it is completing 10 cycles per second. If a rotating object has a frequency of 100 Hertz, it means that it is completing 100 rotations per second.

The units of Hertz are commonly used to measure the frequency of waves, oscillations, and rotations in various fields, including physics, engineering, and electronics.

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The solution of Al(ClO4)3 will have the lowest vapor pressure as it contains the greatest number of particles. Solution of sucrose will have highest vapor pressure because it contains only one particle in solution.

Vapor pressure is the ease with which a substance is converted from liquid to gas. Higher is the vapor pressure, more easily the solution is converted from liquid to gas and vice versa.

The magnitude of intermolecular forces and number of particles in a solution plays an important role in determining vapor pressure. The solution of Al(ClO4)3 has the lowest vapor pressure as it has greatest number of particles and solution of sucrose will have highest vapor pressure because it contains only one particle in solution.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: A 0.100 m solution of which one of the following solutes will have the lowest vapor pressure? Which will have have the highest vapor pressure?

A) KClO4 B) Ca(ClO4)2 C) Al(ClO4)3 D) Sucrose E) NaCl

Santiago’s teacher showed him a kind of cloth that changes color if it is placed out in the sun, but does not change color if it is placed under a desk lamp because the sun gives off a type of light that carries energy, and light from the desk lamp does not.

This is referred to as the luminous celestial body around which the earth and other planets revolve, from which they receive heat and light.

The light emitted by the sun contains energy which could be in the form of solar energy and is therefore the reason why light from the sun changes the color of the cloth while the light from the desk lamp does not.

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The system's total initial momentum is -9.07m/s when the first hockey puck comes to rest following the collision, proving that momentum conservation persists.

We are given that,

Mass = m₁ = 0.17kg

Mass of second hockey = m₂ = 0.11 kg

Initial velocity = v₁i = ?

Final velocity = V₂f = 15m/s

Utilizing the principle of momentum conservation, for finding the initial momentum we get,

m₁v₁i + m₂v₂i= m₁v₁f + m₂v₂f

0.17 (v₁i) + 0.11 (0) = 0.17 (0) + (0-.11) (15)

0.17v₁i = - 1.65

v₁i = - 1.65/0.17

V₁i = - 9.705 m/s

Thus,  the initial momentum of the system would be -9.705 m/s and negative sign indicate the momentum is in opposite direction.

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The system's total initial momentum is -9.07m/s when the first hockey puck comes to rest following the collision, proving that momentum conservation persists.

We are given that,

Mass = m₁ = 0.17kg

Mass of second hockey = m₂ = 0.11 kg

Initial velocity = v₁i = ?

Final velocity = V₂f = 15m/s

Utilizing the principle of momentum conservation, for finding the initial momentum we get,

m₁v₁i + m₂v₂i= m₁v₁f + m₂v₂f

0.17 (v₁i) + 0.11 (0) = 0.17 (0) + (0-.11) (15)

0.17v₁i = - 1.65

v₁i = - 1.65/0.17

V₁i = - 9.705 m/s

Thus,  the initial momentum of the system would be -9.705 m/s and negative sign indicate the momentum is in opposite direction.

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Converging of rays by concave mirror is the property used in telescope and it converges the rays coming from infinity.

A spherical mirror has the shape of a segment of a sphere. A concave spherical mirror has the silvered surface of the mirror on the inner, or concave, side of the curve. A convex spherical mirror has the silvered surface of the mirror on the outer, or convex, side of the curve.

The mirror has a radius of curvature of R, Its center of curvature is the point C, Point V is the center of the spherical segment. A line drawn from C to V is called the principle axis of the mirror.

A point source of light is placed at O, Rays are drawn from O, After reflecting from the mirror, the rays converge at point I, Point I is called the Image point, Light actually passes through the point so the image is real.

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Converging property of concave mirror is used in telescope.

Concave mirror is used in telescope because it converses the incident rays parallel to principal axis and focused on focal point. The intensity of light increases because of the convergence of the light beam. Concave mirror form both real and virtual images. If the objects are closer to the mirror, then a virtual and magnified image is formed. If the object is further away from the mirror, a real and diminished image formed.

Concave mirror is a spherical mirror, whose reflecting surface is curved inward, that is, it faces toward the Centre of the sphere.

Concave mirror equation:

[tex]\frac{1}{v} +\frac{1}{u} =\frac{1}{f}[/tex]

The distance between object and pole of mirror = u

The distance between image and pole of mirror = v

The distance between the principle of focus and pole of mirror is = f

Focal length: f = [tex]\frac{R}{2}[/tex]                    (R = radius of curvature of spherical mirror)

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The elongation of the spring is 0.18 m.

Let us recall that by the use of the Hooke's law, we know that teh force that has been exerted on the spring by the object would be directly proportional to the extension of the spring if the elastic limit has not been exceeded.

We have that;

W = 1/2kx^2

W = work done

k = spring constant

x = extension

We then have;

1.6 = 1/2 * 96 * x^2

x = √2 * 1.6/96

x = 0.18 m

It would be increased by a length of about 0.18 m.

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With the use of formula the extension in the spring is 0.183 m approximately

Elastic Potential Energy of the spring is due to the work done on it by the person winding the clock.

Giving that a heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 1.6 J. The elongation of the spring if the spring constant is 96 N/m can be calculated by using the formula below

E = 1/2Ke²

Where

Substitute all the parameters

1.6 = 1/2 × 96 × e²

1.6 = 48e²

e² = 1.6/48

e² = 0.03333

e = √0.03333

e = 0.183 m

Therefore, the elongation of the spring is 0.183 m

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The direction of E⃗ at a point where B⃗ is in the positive x-direction is in the +y-direction (D). The direction of E⃗ at a point where B⃗ is in the negative y-direction is in the -x-direction (A).

This is due to the fact that the direction of the electric field vector (E⃗) is orthogonal (perpendicular) to the direction of the magnetic field vector (B⃗) and the direction of wave propagation. In the case where the radio wave is traveling in the negative y-direction, the magnetic field vector (B⃗) would be in the positive x-direction in order to be orthogonal to the direction of wave propagation. Therefore, the electric field vector (E⃗) would also be in the positive y-direction.

Similarly, in the case where the radio wave is traveling in the positive y-direction, the magnetic field vector (B⃗) would be in the negative x-direction in order to be orthogonal to the direction of wave propagation. Therefore, the electric field vector (E⃗) would also be in the negative x-direction.

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