A boy runs for 2 km in the east, then turns south and runs for another 3 km. Calculate the total distance and displacement of the boy.

Answer:

d

Explanation:

I did the test and got it right.

Based on the table, the statement that is true about the solubility of two substances in 100 milliliters is the solubility of hydrochloric acid increases as temperature increases. The correct option is d.

Solubility is a condition when the solute is fully mixed with the solvent and there is no difference between the molecules of solvent and the solutes.  The solubility of a substance is based on its molecules. If they are polar, then they can dissolve in numerous solvents.

The salt molecules are fully soluble in the water. The molecules which get dissolved are called the solute and the molecules that dissolve something within them, are called solvents.

Thus, the correct option is d, The solubility of hydrochloric acid increases as temperature increases.

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The Debye approximation is a model used to describe the thermodynamic properties of a solid as a function of temperature.

It assumes that the vibrations of the atoms in the solid can be treated as phonons, which are quantized units of sound energy. The Debye model is based on the assumption that the density of phonon states is constant and that the speed of sound is independent of frequency.

(a) The partition function Z is given by:

Z = e^(-E/kT) + e^(-(E + ħω)/kT) + e^(-(E + 2ħω)/kT) + ...

where E is the ground state energy and ω is the angular frequency of the phonon modes. In the Debye approximation, the sum over all possible phonon modes is replaced by an integral:

Z = V(4π/3)(kT/ħω_D)^3 ∫0^(ω_D/kT) x^2/(e^x - 1)dx

where V is the volume of the solid and ω_D is the Debye frequency, which is a characteristic frequency of the solid.

(b) The mean energy Ē can be obtained by taking the derivative of the partition function with respect to temperature:

Ē = - (∂ ln Z)/(∂β)

where β = 1/kT. Using the Debye approximation for Z, we can show that:

Ē = (3/2)kT + 9Nħω_D/8e^(βħω_D) - (9Nħω_D/8)

where N is the number of atoms in the solid.

(c) The entropy S can be obtained from the partition function:

S = -k(∂ ln Z)/(∂T) + k ln Z

Using the Debye approximation for Z, we can show that:

S = (3/2)Nk + (9Nħω_D/8kT)e^(βħω_D)/(e^(βħω_D) - 1) - Nk ln (V/N(4π/3)(kT/ħω_D)^3)

where the first term is the classical entropy contribution, the second term is the vibrational entropy contribution, and the third term is the configurational entropy contribution.

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Evolution, is a process that results in changes in the genetic material of a population over time.

Distance is the measure of the length of ground covered by an object during its motion. Distance is a scalar quantity. The car will travel 69 m while accelerating.

Distance is the measure of the length of ground covered by an object during its motion. While the displacement is defined as the shortest distance between the two paths.

Distance is a scalar quantity. While displacement is a vector quantity. Mathematically it is given as the product of speed and time.

The following data are given in the problem as

u is the initial  speed=5.0 m/sec

v is the final speed=21 m/sec

s is the distance covered by the car =?

a= Acceleration of car =3.0 m/sec²

According to Newton's third equation of motion, the formula derived will be

\(\rm{v^2=u^2+2as \\\\\)

\(\rm s = \frac{v^2-u^2}{2a} \\\\\rm s = \frac{(21)^2-(5)^2}{2\times3.0} \\\\ \rm s=69 m\)

Hence the car will travel 69 m while accelerating.

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Answer:

8 hz

Explanation:

Wave Frequency = \(\frac{velocity}{wavelength}\)

\(F=\frac{3.6}{0.45} = 8\)

The surface tension of the liquid is 24.1 g/m.

To determine the surface tension of the liquid, employ the formula:

surface tension = (extra force required) / (length of the film)

extra force required = 3.03 g

internal radius = 3 cm = 0.03 m

external radius = 3.2 cm = 0.032 m

The length of the film can be calculated as the circumference of the external ring minus the circumference of the internal ring:

length of the film = (2 * pi * external radius) - (2 * pi * internal radius)

= (2 * pi * 0.032 m) - (2 * pi * 0.03 m)

= 0.1257 m

Hence, the surface tension can be determined following our chosing formula:

surface tension = (3.03 g) / (0.1257 m)

= 24.1 g/m

It can then be concluded that the surface tension of the liquid is 24.1 g/m.

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The electromagnetic energy that is produced when a projectile electron slams into a metal target is called bremsstrahlung radiation.

This radiation is produced when an accelerated charged particle, such as an electron, is decelerated by the Coulomb force of an atomic nucleus. As the electron slows down, it emits electromagnetic radiation in the form of X-rays or gamma rays. The intensity and frequency of the bremsstrahlung radiation depends on the energy of the incident electron and the atomic number of the target material. Bremsstrahlung radiation is a continuous spectrum of electromagnetic radiation, meaning that it consists of a range of frequencies rather than a single frequency.

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The electromagnetic energy that is produced when a projectile electron slams into a metal target is called bremsstrahlung radiation.

When a projectile electron slams into a metal target, the kinetic energy of the electron is transformed into electromagnetic energy. The electromagnetic energy is called bremsstrahlung radiation. This radiation is produced when an accelerated charged particle, such as an electron, is decelerated by the Coulomb force of an atomic nucleus. As the electron slows down, it emits electromagnetic radiation in the form of X-rays or gamma rays. The intensity and frequency of the bremsstrahlung radiation depends on the energy of the incident electron and the atomic number of the target material. Bremsstrahlung radiation is a continuous spectrum of electromagnetic radiation, meaning that it consists of a range of frequencies rather than a single frequency. It is produced when an electron is moving at a high speed and it is moving just in an company to be as fast as they can. in the process they lose energy in a constant phase.

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Answer:

if a gas produced, most likely a chemical reaction took place ​

Explanation:

Answer:

if a gas produced, most likely a Chemical reaction took place

Explanation:

hope this helps and have a good day <3

The ball is not moving when the bullet bounces backward.

To solve this problem, we can use the principle of conservation of momentum. According to this principle, the total momentum before the collision is equal to the total momentum after the collision.

Let's denote the mass of the bullet as mbullet, the velocity of the bullet before the collision as vbulletinitial, the mass of the steel ball as mball, and the velocity of the ball after the collision as vballfinal.

Before the collision, the bullet is moving with a velocity of v bullet initial, and the ball is at rest, so its velocity is 0. After the collision, the bullet bounces backward with a velocity of -5.0 m/s, and the ball moves with a velocity of v ball final.

Using the conservation of momentum, we can write:

m bullet * v bullet initial + m ball * 0 = m bullet * (-5.0 m/s) + m ball * v ball final

Since the initial velocity of the ball is 0, the first term on the left side of the equation cancels out.

m ball * v ball final = m bullet * (-5.0 m/s)

Now, we can substitute the given values into the equation. Assuming the mass of the bullet is negligible compared to the mass of the ball, we can consider m bullet as approximately 0.

0 * v ball final = 0 * (-5.0 m/s)

This equation tells us that the velocity of the ball after the collision is also 0 m/s. In other words, the ball is still at rest even after the bullet bounces backward.

Therefore, the ball is not moving when the bullet bounces backward.

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A particle emitted or absorbed by a molecule cannot be determined without more information other than the wavelength

As per the given data, a photon has a wavelength of 346 nm.

Here we have to determine whether the particle is emitted or absorbed by a molecule.

To determine whether it is emitted or absorbed we need an increase or decrease in intensity and an increase or decrease in wavelength.

We have given only the wavelength of light.

We don't have information about whether it collides with some obstacles, or whether its intensity is decreasing or increasing.

Whether its wavelength is decreasing or increasing.

Until we have that information we can not say anything about whether the light was absorbed or emitted.

Hence the correct answer is:

A. Cannot be determined without more information.

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Answer:

Explanation:

Given:

P = 12 W

R = 270 Ω

t = 2.5 s

____________

Q - ?

Power:

P = I²·R

Current strength:

I = √ (P / R) = √ (12 / 270) ≈ 0.21 A

Charge:

Q = I·t = 0.21·2.5 = 0,525 C

Answer:

It has to be the "New Moon" because that is when the moon is between the sun and the earth.

A lunar eclipse can occur when the earth is between the sun and the moon.

Answer: Wind follows a pattern because the Earth is spinning in one motion. If we were spinning in one way then another we would have one day go by then the spinning cycle would change and we would have to go through that day all over again, it would not be logical because then we would be in the same season as well, we would be in one season for the rest of our lives until we died.

I don't know if this was helpfull or not but I hope it was somewhat close to helpful? If it is not then please do not report this, I am sorry if this was the least bit helpful.

HAVE A NICE DAY! :)

Answer:

Take up space

Explanation:

Actually we know this by the definition of matter which states that "matter is any substance that has mass and takes up space by having volume."

hope it helped you:)

Answer:

i believe that the answer is 4.661764706 seconds

Answer:

The answer is D because when the faults move that is the tectonic plates moving. So earth quakes will be forming when the fault moves.

Explanation:

The height through which the water is lifted is 196.25 m.

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system.

Mechanical advantage is also defined as the ratio of output force to input force in a system.

Mechanical Advantage = Output force / input force

12.5 = output force / 15.7

output force = 15.7 x 12.5

output force = 196.25 m

Thus, the height through which the water is lifted is 196.25 m.

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Explanation:

Find a force is F=mv^2/r, so F=50*5^2/5 = 250N

The minimum angular spread of a 633 nm wavelength He Ne laser beam that is originally 1.00 mm in diameter is 7.72×10⁻⁴ rad

For the case of two light sources producing individual diffraction patterns, if the center of one pattern overlaps with the first minima of the other pattern, the images are just resolvable. This is called Rayleigh's criterion for a limit of resolution in the case of diffraction.

Let λ be the wavelength of the He-Ne laser, D be the diameter of the beam, and θ be the angular spacing in radians. We can write the expression for the angular spacing using Rayleigh's formula, as follows:

 θ =(1.22)λ/D

      = 7.72×10⁻⁴ rad

The first gas laser was the He-Ne laser, which produced a continuous output. The very first He-Ne gas laser was able to put out an infrared beam of wavelength 1150 nm, although the laser's emitted light from the visible part of the electromagnetic spectrum was more popular. This kind of laser is based upon the principle of population inversion.

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Liquid density affects the buoyance of the object placed in it, since the ability of the object to float depends on the density of the liquid, the denser the liquid the more likely the object will float and vice versa.

Archimedes’ principle states that a body immersed in a fluid experiences an upward force which is equal to the weight of the fluid displaced.

The upward force experienced by an object in a liquid is known as buoyant force.

For Example;

An object which is denser than the liquid \((\rho_o > \rho_l)\) has a positive apparent weight and can sink in the liquid.

An object which is less dense than the liquid \((\rho_o < \rho_l)\) has a negative apparent weight and rises in the liquid.

When the weight of the object is equal to the upthrust \((\rho_o = \rho_l)\), the apparent weight will be zero and the object will float in the liquid. This is known as principle of floatation.

Thus, we can conclude that liquid density affects the buoyance of the object placed in it, since the ability of the object to float depends on the density of the liquid, the denser the liquid the more likely the object will float and vice versa.

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Answer:

Liquid density affects the buoyance of the object placed in it, since the ability of the object to float depends on the density of the liquid, the denser the liquid the more likely the object will float and vice versa.

Explanation:

To determine the rise in temperature caused by the conversion of mechanical energy into heat in a 90.0 m waterfall, additional information is needed. Specifically, the specific heat capacity of the water and the amount of mechanical energy being converted into heat are required to calculate the temperature rise using the formula Q = mcΔT, where Q is the heat energy, m is the mass of the water, c is the specific heat capacity, and ΔT is the temperature change. Without these values, it is not possible to provide a specific answer.

Once we have all the values, we can substitute them into the formula to find the temperature rise. Without the specific values for mass or other variables, we cannot provide a specific answer.

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(i)Therefore, it takes approximately 9.27 hours to reach its full power output.(ii)It is necessary to have quick-start power sources, this helps maintain a stable and reliable electricity supply even when wind speeds fluctuate.(c)The Bremsstrahlung effect needs to be considered to ensure proper radiation protection.(d) The near-field region is characterized by strong electric and magnetic fields while the far-field region represents the radiation zone.

(i) To calculate the time it takes for the power station to reach its full power output, we can use the formula:

Energy = Power × Time

Given that the power station generates 6120 MWh of energy over a 10-hour period and the rated power at full capacity is 660 MW, we can rearrange the formula to solve for time:

Time = Energy ÷ Power

Converting the energy to watt-hours (Wh):

Energy = 6120 MWh × 1,000,000 Wh/MWh = 6,120,000,000 Wh

Converting the power to watt-hours (Wh):

Power = 660 MW × 1,000,000 Wh/MW = 660,000,000 Wh

Now we can calculate the time:

Time = 6,120,000,000 Wh ÷ 660,000,000 Wh ≈ 9.27 hours

Therefore, it takes approximately 9.27 hours (or 9 hours and 16 minutes) for the power station to reach its full power output.

(ii) The type of power station that can be started up fastest is a gas-fired power station. Gas-fired power stations can reach full power output relatively quickly because they use natural gas combustion to produce energy.

In contrast, other types of power stations, such as coal-fired or nuclear power stations, have longer start-up times. Coal-fired power stations require time to heat up the boiler and generate steam, while nuclear power stations need to go through a complex series of procedures to ensure safe and controlled nuclear reactions.

This is relevant to optimizing the usage of windfarms because wind power is intermittent and dependent on the availability of wind. This helps maintain a stable and reliable electricity supply even when wind speeds fluctuate.

(c) The Bremsstrahlung effect is a phenomenon that occurs when charged particles, such as electrons, are decelerated or deflected by the electric fields of atomic nuclei or other charged particles. As a result, they emit electromagnetic radiation in the form of X-rays or gamma rays.

In shielding design, the Bremsstrahlung effect needs to be considered to ensure proper radiation protection. These materials effectively absorb and attenuate the emitted X-rays and gamma rays, reducing the exposure of individuals to harmful radiation.

(d) The electromagnetic field output from an antenna can be represented by two main regions:

Near-field region: This region is closest to the antenna and is also known as the reactive near-field. It extends from the antenna's surface up to a distance typically equal to one wavelength. In the near-field region, the electromagnetic field is characterized by strong electric and magnetic field components.

Far-field region: Also known as the radiating or the Fraunhofer region, this region extends beyond the near-field region.The electric and magnetic fields are perpendicular to each other and to the direction of propagation.  The far-field region is further divided into the "Fresnel region," which is closer to the antenna and has some characteristics of the near field, and the "Fraunhofer region," which is farther away and exhibits the properties of the far-field.

The transition between the near-field and the far-field regions is gradual and depends on the antenna's size and operating frequency. The size of the antenna and the distance from it determine the boundary between these regions.

In summary, the near-field region is characterized by strong electric and magnetic fields, while the far-field region represents the radiation zone where the energy is radiated away as electromagnetic waves.

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In the formula AI₂(SO₄)₃, there are three sulfate ions, resulting in a total of three sulfur atoms.

In the compound, the "AI₂" part indicates the presence of two aluminium ions (Al³⁺). These ions will combine with other ions or molecules to form a stable compound.

Within the parentheses, we have the sulfate ion (SO₄). The sulfate ion consists of one sulfur atom (S) and four oxygen atoms (O). The subscript "₄" in SO₄ indicates that there are four oxygen atoms bonded to the sulfur atom. The subscript "₃" outside the parentheses indicates that there are three sulfate ions in the compound. Each sulfate ion contributes one sulfur atom to the overall formula.

Therefore, when we multiply the three sulfate ions by the one sulfur atom in each ion, we get a total of three sulfur atoms represented in the formula AI₂(SO₄)₃.

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Answer:

refraction

Explanation:

When the wave moves from medium 1 to medium 2, then the wave gets refracted. Then the correct option is C.

A wave is an energetic disturbance in a medium that doesn't include any net particle motion. Elastic deformation, a change in pressure, an electric or magnetic intensity, an electric potential, or a change in temperature are a few examples.

A wave is a dynamic disturbance of one or more variables that propagates in physics, geometry, and related sciences. When waves oscillate frequently around an equilibrium value at a certain frequency, they are said to be periodic.

The bending of waves as they go from one substance to another is known as wave refraction. It bends when the wave enters a new material because the wave's speed changes. The optical density or index of refraction of the material affects how light waves bend.

Thus, the correct option is C.

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The missing options are given below.

absorption

diffraction

refraction

reflection

Answer:

Log burning in a fire. Burning wood is an example of a chemical reaction in which wood in the presence of heat and oxygen is transformed into carbon dioxide, water vapor, and ash.

Explanation:

Answer:

1.76 seconds/cycle

Explanation:

Frequency is   10 cycles / 17.6 seconds

PERIOD is  1/frequency = 17.6 seconds/10 cycles = 1.76 s/c    

          cycle is a vibration , so the unit may be  1.76 second / vibration

Answer: 27.1 km

Explanation:

Divide 65km/h and 2.4hr

Based on a significance level of 5% and a calculated p-value of 0.016, we should reject the null hypothesis in favor of the alternative hypothesis.

When conducting a hypothesis test, if our significance level is 5% (0.05) and our calculated p-value is 0.016, we compare the p-value to the significance level to make a decision regarding the null hypothesis.

Null hypothesis: There is no significant effect or relationship.

Alternative hypothesis: There is a significant effect or relationship.

In this case, the significance level is 5% or 0.05.

The p-value is the probability of obtaining a result as extreme or more extreme than the observed data, assuming the null hypothesis is true. In our case, the calculated p-value is 0.016.

If the p-value is less than the significance level (p < α), we reject the null hypothesis.

If the p-value is greater than or equal to the significance level (p ≥ α), we fail to reject the null hypothesis.

In our scenario, the calculated p-value of 0.016 is less than the significance level of 0.05. Therefore, we have sufficient evidence to reject the null hypothesis. This indicates that there is a statistically significant effect or relationship.

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Answer:

4.42 m/s EAST

Explanation:

Conservation of Momentum Law:  total momentum before the collision must equal the total momentum after the collision.

Momentum = P = mv

East is the positive direction.

(3000 kg)(15 m/s) - (2200 kg)(10 m/s) = (3000 kg + 2200 kg)v

45,000 kg·m/s - 22,000 kg·m/s = (5200 kg)v

23,000 kg·m/s = (5200 kg)v

v = (23,000 kg·m/s) / 5200 kg = 4.42 m/s EAST

The direction is east because the final velocity is (+)

Northern American Emergency Response Guide.The main goal of the ERG Handbook is to help first responders immediately identify any unique or general risks associated with the material(s) at issue.

There is also Guide 111, which is for "hazardous" materials.When using generic information, make sure to replace it with more detailed instructions as soon as new information becomes available.

The orange panel next to the diamond-shaped sign or on the extremities and sides of the a cargo tank, vehicle, or rail car may also display the 4-digit ID Number.

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