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A crane lifts an 8-m long steel girder weighing 1600 N up 12 m off the ground. The


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Answer: D. Increasing in randomness.

Explanation: The concept related to this change is entropy. Entropy is a measure of the randomness or disorder in a system. According to the second law of thermodynamics, the entropy of an isolated system tends to increase over time. This means that natural processes often lead to an increase in randomness or disorder.

For example, imagine a container of gas molecules. Initially, the molecules may be confined to one side of the container, creating a region of higher concentration. However, over time, the gas molecules will naturally spread out and become more evenly distributed throughout the container. This increase in randomness or disorder corresponds to an increase in entropy.

Answer:

True

Explanation:

The unit of measurement for loudness is the decibel (dB). Loudness is directly related to the intensity of sound, which is measured in decibels.

The higher the decibel level, the louder the sound. However, loudness is not solely determined by sound intensity. It also depends on the frequency and wavelength of the sound. Therefore, a sound with a higher decibel level may not necessarily be perceived as louder if its frequency is outside the range of human hearing. In summary, loudness is related to the unit decibel, which measures sound intensity, but also depends on the frequency and wavelength of the sound.

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Carrying a load on one's head can indeed be considered as a form of work. Work, in physics, is defined as the transfer of energy from one object to another, resulting in the displacement of the second object in the direction of the applied force.

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Changing the length of a string may alter the force in a physical system, like a pulley mechanism, if it impacts its tension and length.

Nonetheless, regarding a digital system such as a software application, replacing the string with another one that does not affect any crucial factors is improbable to cause an alteration in said force amount.

Determining whether changing a component of a method leads to any modifications in strength requires recognizing essential aspects influencing that force while keeping in mind how this modification might hinder these key elements.

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Light reflects from surfaces in such a way that the angle of incidence equals the angle of reflection. Both angles are measured from the normal line perpendicular to the reflecting surface, as shown in the diagram:

Light is refracted when it travels through the frontier between two media. If the medium 1 has an index of refraction n₁ and the medium 2 has an index of refraction n₂, then the angle of incidence θ₁ and the angle of refraction θ₂ satisfy the following equation:

Explanation:

CON EL TEOREMA DE PITÁGORAS

v = \(\sqrt{(12 km/h)^{2} + (25 km/h)^{2}}\) = 27.7 km/h

Answer:

f=mass × acceleration

f=10×275

f=2750N

Explanation:

PLS MARK BRAINLIEST

Answer:

\(\large{\mathfrak{Unidirectional}}\)

Explanation:

•The series or organisms taking part at various biotic levels form a food chain.

•Each step or level of the food chain forms a trophic level.

•The flow of energy in a food chain is unidirectional.

•The energy that is captured by the autotrophs does not revert back to the solar input, the energy which passes to the herbivores does not come back to autotrophs and so on.

•As it moves progressively through the various trophic levels it is no longer available to the previous level.

Answer:

R = 0.2 Ω

Explanation:

Para aplicar el concepto de resistencia de un conductor electrico, consideramos la siguiente formula:

R = ρ . l / S

Donde l es la longitud del conductor

S la superficie

y ρ el coeficiente de resistividad

Primero necestiamos hacer ciertas conversiones:

ρ = 0.10 ×10⁻⁶ (Ω . m²/m)

S = 2 mm² → 2 ×10⁻⁶ m²

R = 0.10 ×10⁻⁶ (Ω . m²/m) . 4m / 2 ×10⁻⁶ m²

Dentro de la formula simplificamos las unidades, los metros de ρ con la longitud y ambos m². De esa forma la unidad de R queda en Ω (ohmios).

Resolvemos:

R = 0.10 ×10⁻⁶ Ω . 4 / 2 ×10⁻⁶

R = 0.2 Ω

Explanation:

think4

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Answer:

When an object falls freely to the ground, its acceleration is uniform. Hint: When an object falls freely on the ground, the force of the gravity works on it. So the acceleration on the object is the acceleration due to gravity. So the acceleration is uniform on the freely falling body.

There are roughly \(10^{26\) photons in a beam of light with an energy of 100 J and a wavelength of 300 nm.

To calculate the approximate number of photons in a beam of light, we can use the equation relating energy (E) to the frequency (f) or wavelength (λ) of a photon:

E = hf = hc/λ

Where:

Given the energy of the beam of light (Ebeam = 100 J) and the wavelength (λ = 300 nm = 300 x \(10^{-9\) m), we can rearrange the equation to solve for the number of photons (N):

N = Ebeam / E

Let's calculate the number of photons using the given values:

E = hc / λ

 ≈ (\(10^{-33\) J.s) * (3 x \(10^8\) m/s) / (300 x \(10^{-9\) m)

≈ \(10^{-33\) J.s * \(10^9\) / 3

≈ \(10^{-24\) J

N = Ebeam / E

   = 100 J /  \(10^{-24\) J

  ≈ \(10^{26\) photons

Therefore, there are roughly \(10^{26\) photons in a beam of light with an energy of 100 J and a wavelength of 300 nm.

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Answer:

55j

Explanation:

work= force × distance

We have that When A child pushes a toy truck 2.5 m across a floor with a constant force of 22 N.The work done by the child on the toy truck

W= 55 Joules

22 x 2.5= 55 J

Option D

From the question we are told that

A child pushes a toy truck 2.5 m

A constant force of 22 N.

Generally the equation for the  Workdone  is mathematically given as

W=f*d

W=22N*2.5

W= 55 Joules

Therefore

When A child pushes a toy truck 2.5 m across a floor with a constant force of 22 N.The work done by the child on the toy truck

W= 55 Joules

22 x 2.5= 55 J

Option D

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Answer:

The North Pole.

Explanation:

According to the Lenz's law of electromagnetic induction, an induced elemagnetic force tends to give rise to the current. In reaction, this current's magnetic field try to oppose any replacement in the magnetic flux.

So,  as per the law of Lenz's electromagnetic induction, when the current passes in a coil in anti-clockwise direction, this will produce the opposite end of the coil in the north pole.

So, the correct answer is north pole.

The total magnetic field at the center point between the two squares is \(2 *10^{(-4)}\) Tesla.

Let's assume the current passing through each square of wire is I = 15 mA = \(15 *10^{(-3)} A\).

The magnetic field produced by a square wire at its center can be calculated using the formula for the magnetic field of a long straight wire:

B = (μ₀ * I) / (2 * π * r)

Where:

B is the magnetic field

μ₀ is the permeability of free space\((4\pi × 10^{(-7)} T.m/A)\)

I is the current

r is the distance from the wire

For each square wire, the distance from its center to the center point between the two squares is 1.5 cm = 0.015 m.

Calculating the magnetic field produced by each square wire:

B1 =\((4\pi * 10^{(-7)} T.m/A * 15 * 10^{(-3)} A) / (2 *\pi * 0.015 m)\)

B1 =\(10^{(-4)} T\)

Since the current passes through both squares in a counterclockwise direction, the magnetic fields produced by both squares will have the same magnitude and direction.

Therefore, the total magnetic field at the center point between the two squares is:

B_total = B1 + B1

B_total =\(2 * 10^{(-4)} T\)

B_total = \(2 *10^{(-4)} T\)

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--The complete Question is, Two squares of wire, each with a side length of 4 cm, are placed side by side on a table with a distance of 3 cm between the closest sides of the two squares. A 15 mA current passes counterclockwise through both squares. What is the total magnetic field at the center point between the two squares?--

The typical yearly dose received from the decay of 40K in the body is approximately 0.04 mSv

The typical person receives a yearly dose of radiation from the decay of potassium-40 (40K) in the body. Potassium-40 is a naturally occurring isotope of potassium and is present in small amounts in the human body. It undergoes beta decay, releasing beta particles (high-energy electrons) and gamma radiation.

The annual dose from 40K decay can be estimated by considering the radioactivity of the isotope and its specific energy emissions. On average, the human body contains approximately 160 grams of potassium, of which about 0.0117% is 40K. The decay of 40K produces approximately 2.2 beta particles and 2.2 gamma rays per disintegration.

Using these figures and the knowledge that the average energy of beta particles is around 1.31 MeV and the average energy of gamma rays is approximately 1.46 MeV, we can calculate the effective dose. The effective dose is a measure that takes into account the different radiation types and their biological impact.

Based on calculations, the typical person receives an effective dose of about 0.04 millisieverts (mSv) per year from the decay of 40K in the body. This value is derived from the combined contribution of beta particles and gamma rays emitted during the decay process.

In conclusion, the typical yearly dose received from the decay of 40K in the body is approximately 0.04 mSv

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The mass of the vessel, m = 74400 kg

The external diameter, d = 5.20 m

Radius, r = 5.2 / 2 = 2.6 m

The volume of the vessel is given by the volume of a sphere

a) The buoyant force (B) is given by the formula:

b) The tension in the cable is given by the equation

Where T represents the tension

T = 739613.35 - 74400(9.8)

T = 10493.35

Answer:

Acceleration & 9.8 M/S/S

Explanation:

Pretty self explanatory for question 2, speeding up can easily be related to acceleration, and for question 3

"Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2. When discussing the acceleration of gravity, it was mentioned that the value of g is dependent upon location. There are slight variations in the value of g about earth's surface."

Hope it helped - rida

In a symbiotic relationship, both organisms involved benefit or are neutrally affected. Symbiosis is a close and long-term interaction between two different species.

The term "symbiosis" encompasses mutualism, commensalism, and parasitism. In mutualism, both organisms benefit from the interaction, such as in the case of bees and flowers where bees obtain nectar and pollen while also helping flowers to pollinate.

In commensalism, one organism benefits while the other is neither helped nor harmed, such as remora fish that attach to sharks for transportation and feeding on scraps left by the shark. In parasitism, one organism benefits while the other is harmed, such as ticks that feed on blood from a host animal.

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Answer:

Without more information about the lower magnet and the conditions under which the experiment is being conducted, it is difficult to provide a definitive answer. However, in general, whether or not the lower magnet floats depends on its density and the density of the surrounding medium.

If the lower magnet is less dense than the surrounding medium, it will float. If it is more dense, it will sink. If the lower magnet is the same density as the surrounding medium, it will remain suspended at that level.

It is also important to consider other factors such as the strength of the magnetic force and any other forces acting on the magnets. These factors can affect the behavior of the magnets and the overall outcome of the experiment.

Anthocyanins would be present in an object that appears red

This is the term that is used to refer to the natural or the synthetic, substance that is known to give color to other materials or surfaces.

They are very useful in art as well as in cosmetics to create specific colors and effects.

Dyes, liquids and pastes are known to contain pigments in them. They are derived from plants or from animals of mineral sources

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To write the electron configuration for the Na ion, we first need to determine the number of electrons it has. Na is an element in Group 1 of the periodic table with an atomic number of 11, which means it has 11 electrons in its neutral state. However, since the Na ion has a +1 charge, it has lost one electron, leaving it with 10 electrons.

The electron configuration for Na in its neutral state is \(1s^2 2s^2 2p^6 3s^1\). Since the Na ion has lost one electron, we need to remove it from the highest energy level, which is the 3s orbital. Therefore, the electron configuration for the Na ion is \(1s^2 2s^2 2p^6.\)

To summarize, the electron configuration for the Na ion with 10 electrons is: \(1s^2 2s^2 2p^6.\) This represents the arrangement of electrons in the atom and helps us understand the chemical behavior of the Na ion.

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Answer:

Speed of  cannonball just before it hits the ground is  90.77 m/s

Explanation:

Complete Question

A small cannon is placed on top of a fortification. the cannonball leaves the muzzle of the cannon with a speed of 85 m/s at an angle of 25°c above the horizontal. just before the cannonball hits the ground, the vertical component of velocity is 48 m/s downward. what is the speed of the cannonball just before it hits the ground? ignore air resistance.

Solution

Given  

Speed = 85 m/s

The angle = 25 degrees

When it will hit the ground, then vertical velocity = 48 m/s

However, in the projectile motion, the horizontal component will not change  

Vr = V cos (theta) = 85 * cos25

Speed of  cannonball just before it hits the ground is  

V’ = Sqrt (48^2 + (85 * cos 25)^2) = 90.77 m/s

Answer:

the momentum would be 8629.6kgm/s

Explanation:

mass = 322kg

velocity = 26.8m/s

the formula for momentum is

p = m × v

by substituting into the formula

p = 322kg × 26.8m/s

p = 8629.6kgm/s

The possible valid accesses for an array a and vector v, each with 10 elements is given below:Array: a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9]Vector: v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]

The term array is used to define a set of similar data types that are stored in contiguous memory blocks. The index of an array starts at 0, which means the first element of the array is stored at index 0. In the case of arrays, the elements must be of the same data type.The term vector is defined as a dynamic array, which means that the size of the vector can be changed during runtime. Vectors are defined in the same way as arrays, except that they have a dynamic size limit and can be easily resized.

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Answer:

True

Explanation:

Answer:

E' = Qa/4πε[√(a² + z²)]³

Explanation:

Since the non-conducting plate is symmetric, a small charge element dq generates an electric field dE at a distance R from itself and a distance z above the center of the plate. Since the plate is symmetric, we only have the vertical component of the electric field acting at the center so dE' = dEcosθ where θ is the angle between R and the plate.

So, dE' = dEcosθ = dqcosθ/4πεR²

Let σ represent the surface charge density of the plate. So, for a small elemental area dA, dq = σdA.

Substituting this into dE' we have

dE' = σdAcosθ/4πεR²

Also cosθ = a/R where a is half the length of side of the plate of side length, 2a.

So, dE' = σdAa/4πεR³

Also R² = a² + z²

R = √(a² + z²)

So,  dE' = σdAa/4πε[√(a² + z²)]³

Now, dA = dxdy

dE' = σadxdy/4πε[√(a² + z²)]³

So, the total electric field at z is obtain by integrating dE'

E' = ∫dE' = ∫σadxdy/4πε[√(a² + z²)]³ = σa∫dxdy/4πε[√(a² + z²)]³

We integrate dx and dy from -a to a.

So,

E' = σa[2a][2a]/4πε[√(a² + z²)]³

E' = σa³/πε[√(a² + z²)]³

Since the total chare Q = σA where A is the are of the plate. A = (2a)² = 4a²

Q = σA = 4σa²

σ = Q/4a²

substituting σ into E', we have

E' = (Q/4a²)a³/πε[√(a² + z²)]³

E' = Qa/4πε[√(a² + z²)]³