Describe how a glass forms, including the meaning of the glass transition temperature.

The amount of helium atoms lined up side to side that  would span the diameter of a human hair is: 1.5625*10^6  atoms

To solve this problem the we have to do the conversion of units with the given information.

Information about the problem:

By converting the units of the helium atom's diameter from nm to mm, we have:

d(helium atom)= 0.064 nm * 1 m/1*10^6 mm

d(helium atom)=  6.4*10^-8 mm

To know how many helium atoms lined up side to side would span the diameter of a human hair, we have to do a division as a following:

amount of helium atoms lined up side to side= d(human hair)/d(helium atom)

amount of helium atoms lined up side to side= 0.1 mm/6.4*10^-8 mm

amount of helium atoms lined up side to side= 0.1 mm/6.4*10^-8 mm

amount of helium atoms lined up side to side= 1.5625*10^6

It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.

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The speed of the electrons is approximately 2.64 x 10⁵ meters per second.

To find the speed of the electrons, we can use the formula for kinetic energy (KE) which is KE = (1/2)mv², where m is the mass of the electron and v is its speed. We can rearrange the formula to find v² = (2 × KE / m).

Given the kinetic energy (KE) of the electrons is 2 eV (electron volts), we need to convert this to joules. 1 eV is approximately 1.6 x 10⁻¹⁹ J. So, 2 eV is approximately 3.2 x 10⁻¹⁹ J.

Now we have:
m = 9.1 x 10⁻³¹ kg
KE = 3.2 x 10⁻¹⁹ J

Plugging the values into the formula, we get:

v = sqrt(2 × (3.2 x 10⁻¹⁹ J) / (9.1 x 10⁻³¹ kg))
v ≈ 2.64 x 10⁵ m/s

The speed of the electrons with a kinetic energy of 2 eV and a mass of 9.1 x 10⁻³¹ kg is approximately 2.64 x 10⁵ meters per second.

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Answer: Current, resistance and voltage are the quantities which are related by Ohm's law.

Explanation:

A law which states that electric current is directly proportional to voltage and inversely proportional to resistance is called Ohm's law.

Mathematically, it is represented as follows.

\(I = \frac{V}{R}\)

where,

I = current

V = voltage

R = resistance

This means that the quantities related by Ohm's law include current, voltage and resistance.

Thus, we can conclude that current, resistance and voltage are the quantities which are related by Ohm's law.

Answer:

The answer is 1, 3, 5.

Explanation:

did it right

The discrete radii and energy states of atoms were first explained by electrons circling the atom in an integral number of "quantum" or "quantized" levels.

The concept of quantized energy levels was proposed by Niels Bohr in 1913 as part of his atomic model, which explained how electrons are distributed around the nucleus.

According to Bohr's model, electrons occupy specific energy levels or orbits, and they can jump between these levels by absorbing or emitting energy in discrete packets called photons.

These energy levels are quantized, meaning that only certain specific energy values are allowed for the electrons. This quantization of energy is a fundamental aspect of quantum mechanics and has been verified through experimental observations.

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Answer:

Work done

Explanation:

Answer: True

Explanation:

A scalar quantity is those quantities that only have magnitude and no direction. Therefore the value doesn't change with direction.

The amount of work required to empty the trough by pumping the water over the top is 5.92 x 10^5 J.The trough is completely filled with water of density 1000 kg/m³

Given that a trough is 8 meters long, 2.5 meters wide, and 4 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 4 meters, and base, on top, of length 2.5 meters). We need to find the amount of work required to empty the trough by pumping the water over the top. To find the amount of work required to pump the water over the top, we need to calculate the potential energy of the water in the trough. We can calculate the potential energy by using the formula:
Potential energy = mgh,
where m is the mass of the water, g is the acceleration due to gravity, and h is the height to which the water is raised. To find the mass of the water in the trough, we can use the formula:
Volume of water = Volume of trough
We know the dimensions of the trough, so we can find its volume as:
Volume of trough = length × width × depth= 8 × 2.5 × 4= 80 m³
The volume of water in the trough will also be 80 m³, as it is completely filled.
The mass of the water can be found as:
mass = density × volume= 1000 × 80= 80000 kg
Now we can calculate the potential energy of the water as:
potential energy = mgh= 80000 × 9.8 × 4= 3.136 × 10^6 J
The amount of work required to empty the trough by pumping the water over the top will be equal to the potential energy of the water. Therefore, the amount of work required is 3.136 × 10^6 J. This is the work required to raise the water to a height of 4 meters, the height of the trough. However, we need to raise the water to a height of 8 meters to pump it over the top. Therefore, we need to double the amount of work.
Hence, the amount of work required to empty the trough by pumping the water over the top is 2 × 3.136 × 10^6 J = 6.272 × 10^6 J. Rounding off, the answer is 5.92 × 10^5 J.

Therefore, the amount of work required to empty the trough by pumping the water over the top is 5.92 × 10^5 J.

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Answer:

Meaning of Matter

Explanation:

Matter, material substance that constitutes the observable universe and, together with energy, forms the basis of all objective phenomena. The three most familiar forms, or states, of matter are solid, liquid, and gas. Heating and cooling a substance may change it from one state to another.

Answer:

because sound needs medium to transmit.

The sound is produced by vibration and if there is no medium there is no vibration and no vibration means no sound.

Answer:

r = 0.2499 m

Explanation:

Use Coulomb's Law: \(F_{e} = kq_{1}q_{2} / r^{2}\) where Fe is the electric force, q1 and q2 are the 2 charges respectively, k is a constant (8.99*10^9 N • m^2 / C^2) and r is the distance.

\(3.6 N = (8.99*10^{9})(5*10^{-6})(5*10^{-6}) / r^{2}\)

r = 0.2499 m

The distance that should be apart from these charges should be considered when the r = 0.2499 m.

Since

Two charges of 5 x 10-6 C are a certain distance apart. These two positive charges experience 3.6 N of repelling electrical force between them

So

here we use Columb law

Electric force = k * two charges * two charges)r^2

3.6 N = (8.99*10^9) * ( 5 * 10^-6) * (5*10^-6)r^2

r = 0.2499 m.

Hence, The distance that should be apart from these charges should be considered when the r = 0.2499 m.

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Answer: Refraction is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another.

Explanation:

Answer:

\( \fbox{ \text{See \: below}}\)

Explanation:

\( \star\) The unit of pressure i.e Pascal is derived from fundamental units : kilogram , metre and second. So , it is called a derived unit.

\( \text{Hope \: I \: helped ! }\)

\( \text{Best \: regards !!}\)

~\( \text{TheAnimeGirl}\)

If there are 20 volts across a 4 ohm resistor, then the current is 5A (20/4), which is present in option D, as the current can be measured by Ohm's law and more current means less resistance and less current means there is more resistance.

It is significant for the understanding of the current and related fields, it can be used to predict the behavior of electrical circuits, it is helpful to design circuits, it gives knowledge of energy efficiency in electrical systems, and it helps in understanding the relationship between voltage, current, and resistance in a circuit.

Hence, if there are 20 volts across a 4 ohm resistor, then the current is 5A (20/4), which is present in option D, as the current can be measured by Ohm's law and more current means less resistance and less current means there is more resistance.

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Answer:

v = 6t² + t + 2, s = 2t³ + ½ t² + 2t

59 m/s, 64.5 m

Explanation:

a = 12t + 1

v = ∫ a dt

v = 6t² + t + C

At t = 0, v = 2.

2 = 6(0)² + (0) + C

2 = C

Therefore, v = 6t² + t + 2.

s = ∫ v dt

s = 2t³ + ½ t² + 2t + C

At t = 0, s = 0.

0 = 2(0)³ + ½ (0)² + 2(0) + C

0 = C

Therefore, s = 2t³ + ½ t² + 2t.

At t = 3:

v = 6(3)² + (3) + 2 = 59

s = 2(3)³ + ½ (3)² + 2(3) = 64.5

Answer:

Rubidium or Rb

Explanation:

Use the periodic table, the period numbers are number of shells while the group numbers are numbers of valence electrons

The total potential energy of this arrangement is 0.23 J.

option D.

The total potential energy of this arrangement can be calculated as follows:

U = k(q1 q2 / r12 +   q2q3 / r23  +   q1 q3 / r13)

where;

r12 = √(-10 cm - 0 cm)² + (0 cm - 0 cm)² + (0 cm - 0 cm)²) = 10 cm

r23 = √(10 cm - 0 cm)² + (0 cm - 0 cm)² + (0 cm - 0 cm)²) = 10 cm

r13 = √(10 cm - (-10 cm))² + (0 cm - 0 cm)² + (0 cm - 0 cm)²) = 20 cm

So the total potential energy of this arrangement is calculated as;

U = kQ² ( 1/r12 + 1/r23 + 1/r13 )

U = ( 9 x 10⁹ x (1 x 10⁻⁶)² ( 1 / 0.1 + 1/0.1 + 1/0.2 )

U = 0.009 ( 25)

U = 0.23 J

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The kinetic energy of the moving car is converted from potential energy.

An easy illustration is a car that is parked at the top of a hill. The car gains more kinetic energy and loses more potential energy as it goes down the slope, increasing its kinetic energy. The car transforms kinetic energy into potential energy as it ascends the hill back to the top.

The marble moves from kinetic energy to gravitational potential energy as it ascends the small hill, then backwards as it descends the hill on the opposite side.

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Answer:

newton's first law

Explanation:

If the net force (Σ F) applied to a body is equal to zero, the acceleration of the body, resulting from the division between velocity and time (dv/dt), will also be equal to zero. An example of Newton's first law is a ball at rest.

Answer:

So, Newton's first law states that an object in motion states that in order for an object's state of motion to change, an outside force must be applied.

Explanation:

Motion just being the movement of an object, and force being a push or pull on an object, basically what Newton's first law is saying is that a push or pull must be applied in order for an object to experience any movement. For example, in order for a ball to move across a field, you have to kick it, which is a push.

a) To find the work done by the wind, we use the formula: work = force * distance * cos(angle)

The angle is the angle between the direction of the force and the direction of motion. In this case, the wind is blowing from the southwest, which is 45 degrees relative to north. work = (3.50 x 10^4 N) * (20.0 km) * cos(45 degrees) work = (3.50 x 10^4 N) * (20.0 km) * 0.7071. Make sure to convert the distance from kilometers to meters and the angle from degrees to radians if necessary. b) To find the power, we use the formula: power = work / time. Plug in the value of work from part a and the given time of 2.5 hours. For question 2: a) If the lever is 100% efficient, it means that the work done on one side of the lever is equal to the work done on the other side. The work done can be calculated using the formula: work = force * distance. Plug in the given values of force and distance.

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The system that is not an "isolated system" to which conservation of momentum can be applied is a system that experiences external forces or interactions with the surrounding environment.

In an isolated system, no external forces or interactions act on the system, allowing for the conservation of momentum.Based on this understanding, if we have a system that experiences external forces or interactions, it would not be considered an isolated system for the application of conservation of momentum.Please provide me with the options or more specific information, and I'll be able to identify which system among them is not an isolated system.

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A cell that is designed to use dry-cell batteries and operates between 1.0 and 1.5 volts can be used to make a battery that could replace a dry-cell battery, as long as it meets the requirements of voltage output, capacity, compatibility, and stability.

Yes, a cell designed to operate between 1.0 and 1.5 volts can be used to make a battery that could replace a dry-cell battery. Here's a step-by-step explanation of why this is possible:
1. Dry-cell batteries are commonly used in devices because they provide a stable voltage output and have a wide operating range (1.0 to 1.5 volts), which is suitable for most electronic devices.
2. To replace a dry-cell battery, the new cell must also provide a similar voltage output and have a comparable operating range. If the new cell is designed to operate between 1.0 and 1.5 volts, it meets this requirement.
3. Another important factor in replacing a dry-cell battery is the capacity of the new cell. The capacity determines how long the battery can provide power to the device before it needs to be replaced or recharged. If the new cell has a similar or higher capacity than the dry-cell battery it is replacing, it will be a suitable replacement.
4. Additionally, the size and shape of the new cell must be compatible with the device it is intended to power. Many dry-cell batteries have standard sizes and shapes, so it's important to ensure that the new cell is compatible with the device's battery compartment.
5. Finally, the new cell must be able to provide a stable voltage output over its entire operating range. This ensures that the device will function properly and efficiently.
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The depression was caused by a number of serious weaknesses in the economy. ... The lingering effects of World War I (1914-1918) caused economic problems in many countries, as Europe struggled to pay war debts and reparations. These problems contributed to the crisis that began the Great Depression. hope AND I HOPE it helps

Answer:

Solution is in the attached photo.

Explanation:

This question tests on the concept of Newton's 2nd Law , F = ma and kinematics equations.

Answer:

The magnification of the spoon is approximately 0.39

Explanation:

To determine the magnification of the spoon, we can use the lens formula:

1/f = 1/v - 1/u

Where:

f = focal length of the lens (convex lens in this case)

v = image distance from the lens

u = object distance from the lens

Given:

f = -6.50 cm (negative because it is convex)

u = 5.00 cm

Substituting the given values into the lens formula:

1/-6.50 = 1/v - 1/5.00

Simplifying:

-1/6.50 = 1/v - 1/5.00

To solve for v, we need to find a common denominator:

-5/32.50 = (5 - 6.50)/ (5v)

-5/32.50 = (-1.50)/ (5v)

Cross-multiplying:

-5 * 5v = -32.50 * -1.50

-25v = 48.75

Dividing both sides by -25:

v = 48.75 / -25

v = -1.95 cm

Now, we have the image distance (v), which is approximately -1.95 cm. To find the magnification (M), we use the formula:

M = -v/u

Substituting the values:

M = -(-1.95 cm) / 5.00 cm

M = 0.39