What acceleration will result when a 12N net force applied to a 3 kg object?

Convection currents play an essential role in heat transfer within fluids such as water. Therefore Yes, convection currents can be set up in water when it is heated at the top.

Yes, convection currents can be set up in water when it is heated at the top.

When water is heated from the top, the molecules near the heat source gain energy and become less dense. As a result, these warm water molecules rise to the surface. As the warm water rises, it creates a region of lower density at the top. This creates a pressure difference between the bottom (cooler) and the top (warmer) regions of the water.

As a consequence of the pressure difference, the cooler and denser water from the bottom moves upwards to replace the rising warm water. This downward flow of cooler water and the upward flow of warmer water establish a circular motion known as a convection current.

Convection currents play an essential role in heat transfer within fluids such as water. They help distribute heat throughout the fluid by carrying the energy from the heat source (in this case, the top) to other parts of the fluid.

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Answer:

The rate of heat transfer of the second object is greater than the first object.

Explanation:

\(\varepsilon\) = Emissivity of the object

\(\sigma\) = Stefan-Boltzmann constant = \(5.67\times 10^{-8}\ \text{W/m}^2/\text{K}^4\)

\(T_1\) = Temperature of surface 1 = \(25^{\circ}\text{C}+273.15=298.15\ \text{K}\)

\(T_2\) = Temperature of surface 2 = \(40^{\circ}\text{C}+273.15=313.15\ \text{K}\)

\(T_0\) = Surrounding temperature = \(25^{\circ}\text{C}+273.15=298.15\ \text{K}\)

Rate of heat transfer is given by

\(P_1=\varepsilon \sigma (T_1^4-T_0^4)\\\Rightarrow P_1=\varepsilon \sigma A_1(298.15^4-298.15^4)\\\Rightarrow P_1=0\ \text{W}\)

\(P_2=\varepsilon \sigma (T_2^4-T_0^4)\\\Rightarrow P_2=\varepsilon 5.67\times10^{-8} A_2(313.15^4-298.15^4)\\\Rightarrow P_2=\varepsilon A_297.2\)

\(\varepsilon A_297.2>0\)

So, \(P_2>P_1\)

Hence, the rate of heat transfer of the second object is greater than the first object.

The radius of an Ar (argon) atom in Ångstroms, we can use the given information about the face-centered cubic (FCC) arrangement and the density of the solid. The radius of an Ar atom in Angstroms is approximately X.XX Angstroms.

To calculate the radius of an Ar atom, we need to determine the length of an edge of the unit cell. In a face-centered cubic (FCC) structure, each face diagonal is equal to four times the atomic radius (2r). The length of the face diagonal can be found using the Pythagorean theorem, which gives us the value of the edge length (a). Once we have the edge length, we can calculate the volume of the unit cell and use the given density to find the mass of the unit cell. By assuming that the unit cell contains only one atom, we can then find the mass of an Ar atom. Finally, dividing the mass by the volume of a sphere (4/3 * π * r^3) will give us the density. Solving for the radius will give us the value in Angstroms.

Complete Questions- Ar is a solid below -189 oC with a face-centered cubic array of atoms and a supposed density of 2.32 g/cm3. Assuming that the atoms are spheres in contact along the face diagonal, what is the radius of a Ar atom (in Angstroms)? An angstrom = 10-10 m or 10-8 cm. Hint, first find the length of an edge of the unit cell. (Argon's actual density is 1.65 g/cm3.)

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If a source of sound is traveling toward you, the speed of the sound waves reaching you is higher than the speed the sound waves would have had if the source were stationary.

The speed of sound waves in a medium is determined by the properties of the medium itself, such as its density and elasticity. In general, sound waves travel at a specific speed in a given medium, regardless of the motion of the source.

However, when the source of sound is in motion, there is an additional component to consider: the relative motion between the source and the observer. This relative motion affects the perceived frequency of the sound waves, known as the Doppler effect.

If the source of sound is moving towards the observer, the sound waves get compressed, resulting in a higher frequency and shorter wavelength. As a result, the speed of the sound waves relative to the observer appears higher than it would be if the source were stationary.

It's important to note that the actual speed of sound in the medium remains constant. It is the perceived speed or apparent speed of the sound waves reaching the observer that is affected by the motion of the source.

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Answer:

Length -> meter

Mass -> kilogram

Time -> second

g for gram

mg for milligram

t for time

μm for micrometer

ms for millisecond

300cm = 3m

500g = 0.5kg

1500m = 1.5km

250ms = 0.25s

3.65×10^4g = 36.5kg

Answer:

Pemain A

Explanation:

Mengingat data berikut;

Kecepatan pemain A = 12 m/s

Kecepatan pemain B = 36 km/h

Untuk menentukan siapa pelari tercepat di antara dua pemain;

Pertama-tama, kita harus mengubah kecepatan menjadi satuan standar pengukuran yang sama.

Jadi, mari kita gunakan pengukuran umum meter per detik.

Konversi:

36 km/h = (36 * 1000)/(60 * 60)

36 km/h = 36000/3600

36 km/h = 10 m/s

Kecepatan pemain B = 10 m/s

Oleh karena itu, dibandingkan dengan kecepatan pemain A; pemain A lebih cepat.

The output voltage is calculated as 0.25 V. Hence, the correct answer is option d.). The formula used here is Vout = (R₂ / (R₁ + R₂)) * (V₁ + V₂).

The output voltage if V₁ = 1 V and V₂ = 0.5 V can be found using the formula for voltage division: Vout = (R₂ / (R₁ + R₂)) * (V₁ + V₂)

The given values of R₁ and R₂ are 50KΩ and 10KΩ respectively. The values of V₁ and V₂ are 1 V and 0.5 V respectively. Substituting the values in the formula,

Vout = (10KΩ / (50KΩ + 10KΩ)) * (1 V + 0.5 V)

= 0.1667 * 1.5 V

= 0.25 V

Therefore, the output voltage is 0.25 V. Hence, the correct answer is d. 5.

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The weight of the astronaut on Earth is 637 N. This means that the force with which the astronaut is being pulled towards the center of the Earth is 637 N.

The weight of an astronaut on Earth is determined by multiplying their mass by the gravitational field strength. In this case, the astronaut has a mass of 65 kg and the gravitational field strength on Earth is 9.8N/kg.

Therefore, the weight of the astronaut on Earth can be calculated by multiplying their mass by the gravitational field strength:
Weight = mass x gravitational field strength
Weight = 65 kg x 9.8 N/kg
Weight = 637 N
Therefore, the weight of the astronaut on Earth is 637 N. This means that the force with which the astronaut is being pulled towards the center of the Earth is 637 N.

However, it is important to note that weight is not the same as mass.

Mass is a measure of the amount of matter in an object, while weight is a measure of the force with which an object is being pulled towards the center of the Earth due to gravity.

This means that an astronaut would have the same mass on Earth as they would in space, but their weight would be different due to the varying gravitational field strength.

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A .

Explanation:

Tiny water drops hovering in the air are called fog. Fog is like a cloud, but it is near the ground, not high in the sky. Thick fog makes it difficult to see the surrounding landscape

we have that from the Question"which of these might be carried by the wind, which causes the weathering of rocks? " it can be said that  

From the Question we are told

which of these might be carried by the wind, which causes the weathering of rocks?

A. fog

B. mud

C. pollen

D. sand

Generally

Therefore

Which of these might be carried by the wind, which causes the weathering of rocks will be

Option C

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The pendulum must be 0.401 m to double the period.

Period of a pendulum: The period of a pendulum is the time it takes for it to complete one full back-and-forth movement, also known as a swing.

According to the given question, the length of the pendulum is 7.46 m, and the acceleration of gravity is 9.8 m/s^2. So, we will use the formula for period of a pendulum which is given by:  `\(T=2\pi \sqrt{l/g}\)`

where T is the period of the pendulum, l is the length of the pendulum, and g is the acceleration due to gravity. So, substituting the given values, we have: \(T = 2\pi \sqrt{7.46/9.8}\\T = 5.35\ s\)

Therefore, the period of the pendulum is 5.35 s. We are now going to calculate how long the pendulum has to be to double the period. To accomplish that, we'll use the formula for period of a pendulum to calculate the new length of the pendulum.

We will equate the new length to twice the length of the original pendulum. i.e, \(2l = 2\pi \sqrt{(2l)/g}\)

Therefore, we get \(2l/g = \pi \sqrt{(2l)/g}\)

We will now solve the equation for l: \(2 = \pi \sqrt{(2l)/g}\)

Square both sides of the equation: \(4 = \pi^2(2l)/g\)

Divide both sides by π^2 to isolate the value of l:

\(l = 4g/4\pi^2\\l = 0.401 m\)

Hence, the pendulum must be 0.401 m.

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Answer:

cohesion and adhesion property of water

Explanation:

Water - the universal solvent with many unique properties. According to the given question, one of the unique properties of water that can be the best answer to the question is the property of cohesion and adhesion of water.

Therefore, the long distance water movement, from roots up to leaves, of the water transport in large plants depends on one unique property of water. Water's unique property of  cohesion and adhesion  allows water molecules to stick together so they can be pulled upward by the force of transpiration.

Answer:

1. seasons

2. shorter days

Explanation:

Earth's rotation causes the cycle of sunrise and sunset. If Earth began to spin a little bit faster, the days would become shorter (shorter days).

A galaxy is a large system of stars, stellar remnants, interstellar gas, dust, and dark matter, all held together by gravity. Galaxies come in a variety of shapes and sizes, ranging from small dwarf galaxies with only a few million stars, to massive galaxies with trillions of stars.

The stars in a galaxy are usually organized into various structures, including spiral arms, central bulges, and bars. Galaxies can also contain other astronomical objects, such as planets, moons, asteroids, and comets. The Milky Way is the galaxy in which our solar system resides, and it contains an estimated 100 billion stars.

Here in this question,

Sunrise and sunset on Earth are caused by the rotation of the Earth on its axis.

As the Earth rotates, different parts of the planet are either facing towards or away from the Sun. When a specific location on Earth rotates toward the Sun, it experiences sunrise, and when that location rotates away from the Sun, it experiences sunset. The length of daylight between sunrise and sunset depends on the latitude of the location and the time of year.

Therefore, the correct option for the First Blank: is sunrise and sunset, and for Second Blank: shorter days.

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The magnification of the image formed by the lens is -0.982.

To determine the magnification of the image formed by the lens, we can use the lens formula:

1/f = (n - 1) * (1/r1 - 1/r2)

Where f is the focal length of the lens, n is the refractive index of the lens material, r1 is the radius of curvature of the front surface, and r2 is the radius of curvature of the back surface.

Given that the radii of curvature are 34.5 cm and -26.9 cm, and the refractive index is 1.66, we can substitute these values into the lens formula to calculate the focal length.

Using the lens formula, we find that the focal length of the lens is approximately 13.54 cm.

The magnification of the image formed by the lens can be determined using the magnification formula:

m = -v/u

Where m is the magnification, v is the image distance, and u is the object distance.

Given that the object is placed 42.6 cm from the lens, we can substitute this value and the focal length into the magnification formula to calculate the magnification.

Substituting the values, we find that the magnification of the image formed by the lens is approximately -0.982.

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The work required to deflect the spring by 24.04 cm from its rest position is approximately 1,635.42 joules.

The work required to deflect a linear spring can be calculated using the formula:

where k is the spring constant and x is the displacement from the rest position.

In this case, the spring constant is 69 kN/m (which can be converted to N/m by multiplying by 1000) and the displacement is 24.04 cm (which can be converted to meters by dividing by 100).

Plugging the values into the formula:

Calculating:

Therefore, the work required is approximately 1,635.42 J.

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Answer:

A                                    

Explanation:

Answer : a. Extrusion

The statement that is true about the Native Americans in Carolina is     (D). The Yamasee and Tuscarora Indians left the area for new homes.

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No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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From the calculation;

1) Melting point of indium = 171.4°

2) The resistance is 52.9 ohm

3) The power dissipated is  834 W

The temperature coefficient of resistance is a measure of how much the resistance of a material changes with temperature. It quantifies the relationship between the change in resistance and the change in temperature.

We have that;

R1/R2 = (1 + αt1)/(1 + αt2)

50/76.8 = (1 + (3.92 * \(10^-3\) * 20))/(1 +  (3.92 *\(10^-3\) * t))

0.65 = 1.0784/1 + 0.00392t

0.65(1 + 0.00392t) =  1.0784

0.65 + 0.0025t = 1.0784

t = 171.4°

P = \(V^2\)/R

R = \(V^2\)/P

R = \(230^2\)/1000

R = 52.9 ohm

The new power is;

P =\(210^2\)/52.9

P = 834 W

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Answer:

The answer is high

Explanation:

I just took the test :))

Higher frequency and higher pitch are produced by sounds with shorter wavelengths. So, long waves sound low and short waves sound high.

Physical characteristics of waves, such as transmission, reflection, polarization, diffraction, and refraction, are examples of wave attributes.

Waves are described mathematically using terms like wavelength, frequency, and amplitude.

Sound and light are two examples of common waves we encounter. Whether you're discussing waves or vibrations.

All of them may be classified according to the following four factors: amplitude, wavelength, frequency, and speed.

According to the graph, pitch perception is influenced by tone strength; below 1000 Hz, pitch tends to decrease with increasing loudness, and beyond 1000 Hz, pitch tends to increase.

Therefore, high pitch that is heard when waves are closely spaced together.

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Answer:  please see attached work.

Explanation:  please see attached work.  Assuming 500 sheets of paper = 20 lb.  (typicical value).  

Answer:

7.2375m/s^2

Explanation:

initial velocity=-25 km/h=-6.94m/s

final velocity=35 km/h=9.72m.s

distance=3.2m

v^2=u^2+2as

9.72^2=-6.94^2+2a*3.2

94.48=48.16+6.4a

(94.48-48.16)/6.4=a

7.2375m/s^2

The total photons required to lead to an observable flash are 3.

At the peak of  visual sensitivity, the energy of photon is given by:

E = hc/λ

Where h is plank's constant, c is speed of light and λ is the wavelength

Putting the values:

E = 6.63×10^-34 × 3×10^8 / 5.50 × 10^-7m

E =3.6×10^-19 J

This is the energy of one photon. The human eye can detect an amount of energy of 10^-18 J

Amount of photons contained in this energy is

E = 10^-18 J / 3.6×10^-19 J = 3 photons

Hence, The total photons required to lead to an observable flash are 3.

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Answer:

a = 6.27 m/s² - acceleration

Explanation:

Given:

F = 9 079 N

m = 1 447 kg

_________

a - ?

Acceleration:

a = F / m

a = 9 079 / 1 447 ≈ 6.27 m/s²

They played a significant role in the High Gothic cathedrals, perhaps most notably in Chartres Cathedral.  Thus, option A is correct.

They had two purposes: first, to illuminate the interior with a mystical color that symbolized the Holy Spirit, and second, to illustrate Bible stories for the vast majority of the crowd who could not read.

Although “portraits” and emblems were frequently incorporated, the subject in churches was typically religious, and many of the narrative pieces provide insightful glimpses into the medieval age.

Therefore, Churches employed stained-glass windows to add to their beauty and to educate the public through story or symbolism.

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Polarized light light is unique in that it vibrates mostly in one direction.

Polarized mild waves are light waves in which the vibrations occur in a single plane. The process of reworking unpolarized light into polarized light is called polarization. There are a ramification of methods of polarizing mild.

Polarization is used for differentiating among transverse and longitudinal waves. Infrared spectroscopy makes use of polarization. it is used in seismology to take a look at earthquakes. In Chemistry, the chirality of organic compounds is tested the use of polarization strategies.

Refraction is the change in route of waves that takes place when waves tour from one medium to every other. . Light has a dual nature. as it has waves, sunlight passing via  rainstorm makes a rainbow. however, while mild moves a sun mobile, it can provide strength as a series of very small bursts. particles of count number have names together with the proton, electron and neutron.

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Answer: A

Explanation:

Answer: C.

He must move the magnet through the inside of the wire coil.

Explanation:

To detect a current Felix must move the magnet around wire coil. This magnetic field around the wire make the electrons mobile and creates an electrical current. Hence. option B is correct.

Electricity can be  created using magnetic' characteristics. Electrons are pushed and pulled by moving magnetic fields. Electrons in metals like are loosely held in their valence shell. Hence they can be transited easily.

The electrons in the wire are pushed when a magnet is moved around it or when a coil of wire is moved around a magnet, producing an electrical current. Kinetic energy, or the energy of motion, is effectively transformed into electrical energy via electricity generators.

The coil of metallic wire can produce a magnetic field in turn also. This is what called the electromagnetic induction. Therefore moving the bar magnet around the coil generates an electric current and results in a deflection in ammeter.

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Answer:

C. A seagull sits on top of a fence post.