Two boys find a lens on a beach. If an object sitting 25.0 cm in front of the lens forms an image 20.0 cm behind the lens, what is the focal length of the lens?

Answer: 0.488  m

Explanation: I have my ways ;>

An increase in the entropy of a system can be described as an increase in the total amount of disorder in a system.

Entropy

Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty. From classical thermodynamics, where it was originally recognized, through the microscopic description of nature in statistical physics, to the fundamentals of information theory, the phrase and concept are utilized in a variety of disciplines. It has numerous applications in physics and chemistry, biological systems and how they relate to life, cosmology, economics, sociology, weather science, and information systems, especially the exchange of information. 

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Answer:

The answer is temperature

The magnitude is 9.78 m/s^2 and the direction is downward.

Given: On a typical clear day, the atmospheric electric field points downward and has a magnitude of approximately 105 N/C. A small dust particle of mass 2.3×10^−15 g that carries a single electron charge.

Required: To compare the gravitational and electric forces on the small dust particle and the acceleration (both magnitude and direction) of the dust particle.

Let’s find the gravitational force on the small dust particle using the formula: \(FG=mg\)

where \(m=2.3\times10^{-15} g,\)

\(g=9.8\ m/s^2\)

\(FG=(2.3\times10^{-15}\ g)(9.8\ m/s^2)\)

=2.254×10^-14 N

Let’s find the electric force on the small dust particle using the formula:

\(FE=Eq\)

where E = 105 N/C,

\(q=1.6\times10^{-19} CF\)

\(E=(1.6\times10^{-19} C)(105\ N/C)\)

\(=1.68\times10^{-17}\ N\)

We can now compare the magnitudes of gravitational force and electric force on the small dust particle.

\(FG = 2.254\times10^{-14} N\)

\(FE = 1.68\times10^{-17} N\)

We can see that FG is much greater than FE.

Let’s now calculate the acceleration of the small dust particle.

a = FG

m = FG

\(2.3\times10^{-15} g = (2.254\times10^{-14} N)/(2.3\times10^{-15} g)\)

\(= 9.78\ m/s^2\)

The acceleration of the small dust particle is 9.78 m/s^2 directed downward (toward the earth's surface).

Thus, the magnitude is 9.78 m/s^2 and the direction is downward.

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Answer: A. An ice hockey player picks up a trophy as he slides past it

Explanation:

A PE X

The statement that best describes a perfectly inelastic collision is

C. A surfer falls off of his surfboard when a wave hits him.

A collision is the interaction between two bodies in such a way that the momentum and velocity of one body gets changed due to the presence of other body. There are three types of collision-

1. Elastic collision

2. Inelastic collision

3. Perfectly inelastic collision.

In all types of collision , the momentum of the system before collision and after collision always remains same or we can say that momentum is conserved in collisions

An elastic collision is the one in which kinetic energy is also conserved and coefficient of restitution is one. Both the bodies move separately with different velocities after elastic collision.

In inelastic collision  there is a loss of kinetic energy and coefficient of restitution is less than one.

In perfectly inelastic collision there is maximum loss of kinetic energy and coefficient of restitution is zero. Both the bodies stick together after collision and move with same velocity

Coefficient of restitution is the  ratio of  relative velocity of separation after collision to relative velocity of approach before collision.

A surfer falls of his surfboard when a wave hits him is an example of perfectly inelastic collision because in this when water hits the surfers he falls of and sticks to the water , and will also now move with the velocity of water .

So  when the surfer falls off his surfboard when a wave hits him is perfectly inelastic collision.

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Answer:

33.23 m

Explanation:

At the point where both objects will meet, the vertical height will be equal.

From the equations of motion, the vertical height of the body falling at any time is given as

(y - y₀) = ut + ½gt²

y = vertical height at any time T

y₀ = initial height of the object = 81.5 m

u = initial velocity = 0 m/s (body was dropped)

g = -9.8 m/s²

(y - 81.5) = 0 - 4.9T²

y = 81.5 - 4.9T² (eqn 1)

For an object thrown up, the vertical height of the body at any time, t, is given as

(y - y₀) = ut + ½gt²

y = vertical height of the object at any time t

y₀ = initial height of the object = 0 m

u = initial velocity = 40 m/s

g = -9.8 m/s²

y = 40t - 4.9t² (eqn 2)

At the point where the two objects meet, we equate eqn 1 and eqn 2

y = y

81.5 - 4.9T² = 40t - 4.9t²

But T = (t + 2.2) (Since object 2 was dropped 2.2 s after object 1)

81.5 - 4.9(t + 2.2)² = 40t - 4.9t²

81.5 - 4.9(t² + 4.4t + 4.84) = 40t - 4.9t²

81.5 - 4.9t² - 21.56t - 23.716 = 40t - 4.9t²

81.5 - 21.56t - 23.716 - 40t = 0

57.784 = 61.56t

t = (57.784/61.56) = 0.93866 = 0.94 s

Therefore, the vertical height at t = 0.93866 s is

y = (40×0.93866) - 4.9(0.93866²) = 33.23 m

Hope this Helps!!!

The straightforward question that Olbers' paradox poses is: "Why is the night sky dark, if the universe is infinite and filled with an infinite number of stars?" This question arises because if the universe is infinite and filled with an infinite number of stars, it would seem that the night sky should be constantly bright, as every direction one looks would eventually intersect with a star.

This is not the case, and the night sky is actually dark.

Olbers' paradox, also known as Olbers' conundrum, is a paradox that arises from the question of why the night sky is dark, despite the fact that it appears that the universe is infinite and filled with an infinite number of stars. This paradox appears to suggest that the cosmos must be finite in age.

There are several possible explanations for this paradox, including the finite age of the universe, the expansion of the universe, and the absorption of light by interstellar dust. These explanations suggest that the universe is not actually infinite and that the night sky is dark because the light from distant stars has not had enough time to reach us, or because the light is absorbed by the interstellar medium before it reaches us.

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When a plane moves in a circle, it is subjected to a force that keeps it in a circle. This force is referred to as the centripetal force. The formula for centripetal acceleration is given as: ac =\((v^2)/r\)..

This formula can be re-arranged to solve for the radius of the circle: r = (v^2)/ac Where r is the radius of the circle, v is the velocity, and a is the centripetal acceleration. Given that the plane completes the loop in 45.0 seconds and experiences a centripetal acceleration of 14.7 m/s², the radius of the loop can be calculated as follows:r = (v^2)/ac Where: \(v = 2πr/T\).

The velocity of the plane is equal to 2πr/T, where T is the period of the loop)T = 45.0 second sac = 14.7 m/s²Therefore:r\(= [(2πr/T)^2]/acr = [(2πr/45.0)^2]/14.7r = 20.17 rr = 20\)The radius of the loop is approximately 20 m.

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The velocity (v) of a wave set up in a stretched string, caused by plucking it, can be described by the equation \(V = kF^x * l^y * m^z.\)

In this equation, F represents the tension in the string, l represents the length of the string, and m represents the mass of the string.

The exponents x, y, and z represent the respective powers to which the tension, length, and mass are raised. The values of x, y, and z depend on the specific characteristics of the string and the wave being produced.

The constant k represents the proportionality constant that relates the tension, length, and mass to the velocity of the wave. Its value is determined experimentally or can be derived from theoretical considerations.

This equation shows the dependence of the wave velocity on various parameters such as tension, length, and mass. By adjusting these parameters, we can manipulate the wave velocity in the string, thereby affecting the properties of the wave, such as frequency and wavelength.

Therefore, It is important to note that the specific values of x, y, and z, as well as the constant k, would need to be determined through experimentation or derived based on the specific properties of the string and the wave under consideration.

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The time taken by the wave to deliver energy to a wall of 1.05 cm² area is 0.753 μs. The RMS strength of the magnetic field in an EM wave traveling in free space is 24.5 nt and energy delivered to 1.05 cm2 of a wall is 355J.

Solution: Part A The energy delivered by an electromagnetic wave per second per unit area is given as

Poynting vector= \([E × B]/μ0\)

Here,E is the electric field strength, B is the magnetic field strength and

μ0 is the permeability of free space. If the energy delivered to the area, dA, is dE, in time dt, then from the above equation

Poynting vector=\(dE/dt × dA\)

On integration, the total energy delivered by the wave over time t is given as\(E= 1/μ0 × ∫p dt\)

Since the Poynting vector, \(|P|= EB/μ0\) and the strength of the magnetic field in the EM wave is given as B = Brms

Hence the Poynting vector is given as

\(|P|= ErmsBrms/μ0\)

= Erms²/377 watts/m²

The energy delivered to an area, dA, in time dt is given by

\(dE= P dt × dA\)

= Erms²/377 × dt × dA

The energy delivered to an area A in time dt is given by

dE = Erms²/377 × A × dt

The total energy delivered to an area, A, in time t is given by

E = ∫dE = Erms²/377 × A × ∫dtE

= Erms²/377 × A × t

Thus, the time duration of an EM wave to deliver energy, E, to an area, A, is given by

t = 377 E / (Erms)² × A

Here,E = 355J

A = 1.05 cm²

= 1.05 × 10⁻⁴ m²Brms

= 24.5 nT

= 24.5 × 10⁻⁹ Tt

= 377 × 355 / (24.5 × 10⁻⁹)² × 1.05 × 10⁻⁴

= 7.53 × 10⁻⁷ seconds

= 0.753 μs (rounded to three significant figures)

Answer: The time taken by the wave to deliver energy to a wall of 1.05 cm² area is 0.753 μs.

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The molar solubility of La(IO₃)₃ in pure water is approximately 1.0 × 10⁻⁴ mol/L.

The molar solubility of a compound refers to the maximum amount of the compound that can dissolve in a given solvent at a specific temperature, typically expressed in moles per liter (mol/L). To determine the molar solubility of La(IO₃)₃ in pure water, we can use the given value of the solubility product constant (Ksp) for La(IO₃)₃, which is 1.0 × 10⁻¹¹.

La(IO₃)₃ dissociates into La³⁺ and IO₃⁻ ions in water. Let's assume x mol/L represents the molar solubility of La(IO₃)₃. According to the balanced chemical equation, one mole of La(IO₃)₃ produces one mole of La³⁺ ions and three moles of IO₃⁻ ions.

Therefore, the solubility product expression for La(IO₃)₃ is:

Ksp = [La³⁺][IO₃⁻]³

Since the concentration of La³⁺ ions is equal to the molar solubility (x) and the concentration of IO₃⁻ ions is three times the molar solubility (3x), we can substitute these values into the Ksp expression:

Ksp = (x)(3x)³

1.0 × 10⁻¹¹ = 27x⁴

Solving for x, we find:

x ≈ 1.0 × 10⁻⁴ mol/L

Therefore, the molar solubility of La(IO₃)₃ in pure water is approximately 1.0 × 10⁻⁴ mol/L.

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The 74AS138 is a 3-to-8 decoder/demultiplexer with active low outputs, while the 74AC08 is a quad 2-input AND gate. Both devices have different input and output characteristics, which can affect their compatibility when connected together.

In terms of input voltage levels, the 74AS138 has a high-level input voltage (VIH) of 2.0V minimum and a low-level input voltage (VIL) of 0.8V maximum, while the 74AC08 has a VIH of 2.0V minimum and a VIL of 0.8V maximum as well. This means that the input voltage levels of both devices are compatible with each other when supplied with VCC = 4.5V.

However, the output voltage levels of the 74AS138 may not be compatible with the input voltage levels of the 74AC08. The 74AS138 has active low outputs, which means that a logic high output voltage (VOH) is 0.5V maximum and a logic low output voltage (VOL) is 2.4V minimum when supplied with VCC = 4.5V. On the other hand, the 74AC08 has a VIH of 2.0V minimum and a VOL of 0.05V maximum when supplied with VCC = 4.5V. This means that the output voltage levels of the 74AS138 may not be able to drive the input voltage levels of the 74AC08, which can result in unreliable logic levels and/or damage to the devices.

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Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

Answer:

C) C4H12O2 is the anwser

hope it helps :))

The chemical formula for the molecule modeled is C₆H₁₂0₂. Hence option C is correct.

Material is made up of atoms. Atom consist of protons neutrons and electrons. electrons revolve around the nucleus in fixed orbit and fixed momentum.

It is the systematic distribution of electrons in energy levels for given element. it tells about how electrons are distributed in the orbitals of an atom. The notation for electronic configuration is nXᵃ where n shows energy level which describe the radius of an atom, X is an orbitals(s,p,d,f) which describe the shape of the orbit. and a is the number of electrons belonging to the particular level and orbital. Maximum electrons that can be fit in a given orbit is 2N² . where N is the number of orbit.

In this figure there 6 carbon atoms, 12 hydrogen atoms and 2 oxygen atoms . Hence option C is correct.

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The  2018 Earning per share , the 2019 Earning per share  and the amount it will take the 2018 Earning per share  be presented in the 2019 comparative financial statements are all shown on the attached picture.

Earning per share can be described as the earning available after distribution of dividend divided by the number of shares outstanding at the end of the year. This will be reported through net income.

In conclusion, The 2018 EPS - $400,000 / 400,000 = $1.00

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Complete question is :

The Li Group had 202,000 shares of common stock outstanding at January 1, 2018. The following activities affected common shares during the year. There are no potential common shares outstanding

2018  

Feb .28 Purchased 6,000 shares of treasury stock.

Oct 31 Sold the treasury shares purchased on February 28

Nov 30 Issued 24,000 new shares.

Dec 31 Net income for 2018 is $400,000

2019  

Jan. 15 Declared and issued a 2-for-1 stock split

Dec .31 Net income for 2019 is $400,000.

1. Determine the 2018 EPS

2. Determine the 2019 EPS

3. At what amount will the 2018 EPS be presented in the 2019 comparative financial statements?

13.The color with the longest wavelength is option A. Red.

14.The sky appears blue due to option D. Scattering of light.

Red light has a longer wavelength compared to yellow and blue light.The color that has the longest wavelength is red. The color of the sky appears blue due to scattering of light. The distance between one peak and the next in a series of waves, particularly electromagnetic waves traveling through space or along a wire is referred to as wavelength.

The wavelength of light, for example, determines its color. Red light has the longest wavelength, followed by orange, yellow, green, blue, and purple, with violet light having the shortest wavelength. When light is reflected off a surface or passes through a medium, it can be deflected in various directions, a phenomenon known as scattering of light.

The Earth's atmosphere scatters sunlight in all directions, but the shorter blue wavelengths are scattered more than the longer wavelengths. As a result, we perceive the sky as blue during the day.  The light becomes scattered when it interacts with particles in the atmosphere, causing the sky to appear blue during the day and red during sunset or sunrise. The scattering of light is the process that causes the sky to appear blue.

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Answer:

The answer is the First One

Explanation:

Electromagnets can work with a magnetic source, and not just electric. sorry if my answer turns out to be wrong

The answer is False.

An axillary temperature of 100 degrees Fahrenheit taken orally would not register accurately.

Axillary temperature is taken by placing the thermometer under the arm. It is usually slightly lower than oral temperature, as it takes longer for the heat to reach the axilla. On the other hand, oral temperature is taken by placing the thermometer under the tongue, which is closer to the body's core temperature.

Therefore, an axillary temperature of 100 degrees Fahrenheit would be considered a low-grade fever, while an oral temperature of 100 degrees Fahrenheit would be a significant fever.

It is essential to take the temperature accurately, as it can help diagnose and monitor various medical conditions. Depending on the situation, the method of temperature taking may vary. Oral, rectal, and tympanic temperature readings are commonly used in clinical settings, while axillary temperature readings are more commonly used at home. It is essential to follow the manufacturer's instructions carefully when taking a temperature reading to ensure accurate results.

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Answer:

please give me BRAINLIEST Answer

Explanation:

10.0 210.0 ms2

5.0 25.0 ms2

15.0 215.0 ms2

Answer:

The distance traveled by the apply after being released is 127.45 m.

Explanation:

The given parameters;

time of motion of the apple, t = 5.1 s

initial velocity of the apple, u = 0

The distance traveled by the apply is calculated by applying second kinematic equation as shown below.

Assuming downward motion to be positive.

ok oh if i need any answers just asking i'll help you

For this case, the relationship between the two forces is given by:

F1 = nF2

Where,

Then, replacing the values we have:

F1 = (2.2)(202)

Having the calculations we have:

F1 = 444.4N

Answer: The output force that only lifts the load is F1 = 444.4N.

Explanation:

The mass of a cylinder made of barium with a height of 2 inches depends on the radius of the cylinder as defined by the

function m(r) = 7.18872.

which system of equations and solution can be used to represent the radius if the mass of the cylinder is 11,000 grams?

round to the nearest hundredth of an inch.

The phenomenon in hearing that is analogous to spatial frequency channels in vision is critical bands. Hence, the correct option is A: Critical bands.

Critical bands are regions of the audible frequency range in which a complex sound is divided into individual, discrete frequency bands by the human auditory system.

For instance, when different frequencies in a complex sound, such as a musical instrument or a human voice, are picked up by the ear, they are sent to the brain via various channels that respond to specific frequencies.

These channels are referred to as critical bands. The frequency range of these bands varies depending on the loudness of the sound.

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Answer:

A physical property and physical description are similar because the changes in a physical property of a system can be used to describe its changes between momentary states.

A physical property is is defined as any property that is measurable, and also  whose value describes a state of a physical system.

Examples of physical properties include;

density,

hardness,

melting and boiling points, and

thermal conductivity

A physical description is observed physical properties usually represented by a specific class, compound or elements.

Both physical property and physical description are similar because the changes in a physical property of a system can be used to describe its changes between momentary states.

Answer:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

I do not know

hi I thinks the answer is Tralse

Answer:

Principal focus of concave lens -

★ The point at which rays parallel to principal axis coming from infinity appear to converge after being refracted from concave lens is called the principal focus of concave lens.

________________________

• Additional information -

★ Principal focus - A number of rays parallel to the principal axis after reflection from a concave mirror meet at a point on the principal axis or appear to come from a point after reflection from a convex mirror on the principal axis. This is called principal focus.

The molar mass of sulfur hexafluoride is 146 g/mol.

13. g  of sulfur hexafluoride = 13 g / 146g/mol = 0.089 mol

The pressure of sulfur hexafluoride

P = nRT / V

P = 0.089 mol x 0.08206 Latm/mol/k x (10.0 + 273.15)K / 5.0 L

P = 0.41 atm.

The rate of change in position of an object in any course. Speed is measured because the ratio of distance to the time wherein the distance became included. Speed is a scalar amount because it has handiest route and no significance.

Velocity can be notion of as the rate at which an object covers distance. A quick-moving object has a high speed and covers a notably big distance in a given amount of time, whilst a sluggish-shifting item covers a relatively small amount of distance in the same amount of time.

The primary unit or the S.I. unit of velocity is m/s or ms¹.

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Answer:

The amount of friction depends on the force pushing the surfaces together. If this force increases, the hills and valleys of the surfaces can come into closer contact. The close contact increases the friction between the surfaces. Objects that weigh less exert less downward force than objects that weigh more.

Explanation:

Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.

Answer: The energy to move the fluid is provided by the pressure on the fluid surface.

Explanation:  The frictional losses in the suction pipework and rises in the suction pipework system will reduce the fluid pressure at the pump inlet. If the pump inlet connection is removed the fluid will not flow out of the suction pipework. Hope this helps! :)