WhAT is the change IN THE entropy of 2.0kg of h2o molecules when transform at a constant pressure of 1 atm from water at 100 degrees celcius to steam at the same tEMPERATURE?

The optical effect that is essential to the visual experience of motion pictures is known as Persistence of Vision.

Persistence of Vision (POV) is a phenomenon of the eye where an image or object is perceived by the brain for a short period of time after the image or object has been removed from the viewer's sight. The phenomenon occurs because of the retina's temporary retention of visual images even after they have been seen.

The Persistence of Vision enables the human eye to perceive the illusion of motion when viewing a series of still images in rapid succession. This effect is the foundation for the creation of motion pictures. In films, a sequence of still images is displayed in rapid succession (typically at a rate of 24 frames per second) that simulates motion to the human eye, tricking it into believing that the images are moving in a fluid and natural way.

POV is an essential aspect of the visual experience of motion pictures as it allows filmmakers to create an illusion of motion using a series of still images. The human eye is capable of retaining images for a short period of time after they have disappeared from the field of vision, which makes this effect possible.

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I think it's mass...

The mass of an object refers to the amount of matter that is contained by the object; the weight of an object is the force of gravity acting upon that object. Mass is related to how much stuff is there and weight is related to the pull of the Earth (or any other planet) upon that stuff.

Given:

The object distance is,

The focal length is,

To find:

The image distance

Explanation:

The lens formula gives,

For the concave lens, the focal length is negative and the object distance is negative as per the sign convention. So we write,

Hence, the image is 5.22 cm in front of the lens.

When formulating a theory on galaxy creation and evolution, there are two key components. One is knowledge of the rate of star creation within galaxies.

Astronomers calculated that there are between 100 and 200 billion galaxies in the universe by multiplying this figure by the number of times this tiny area of sky would fit further into entire sky.

The greatest galaxies can contain up over one hundred trillion stars, whereas the tiniest galaxies only contain a "mere" few hundred million stars. Spiral, elliptical, unusual, and irregular galaxies can be divided into four categories by scientists.

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Answer:

D

Explanation:

Well, light travelling in a year is a light year.

Answer:

D: Lightyear

Explanation:

One lightyear (ly) is the distance traveled by light in year time.

It is equal to \(9.46 * 10^{15} \ m\).

Answer:

The answer is B

Explanation:

because,choose A is the newton's second law

and C is newton's third law so the answer is B

Newton's first law describes: how inertia affects the motion of an object. Option (B) is correct.

According to Newton's first law of motion, an external force must be applied in order for an object to begin moving, stop moving, or change direction. Inertia is the ability of large entities to resist changes in their state of motion. The law of inertia is another name for the first law of motion.

According to Newton's First Law, a body in uniform motion or at rest will remain in that state up to and unless a net external force acts on it.

The key idea here is that an object will maintain a constant velocity if there is no net force produced by unbalanced forces operating on it. The item remains at rest if that velocity is 0. In addition, the velocity will change as a result of any extra external forces that are applied.

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Answer:

Concentrated solar power facilities are solar power—generating facilities that generate electricity at large centralized facilities and transmit that power to homes and businesses through the electric grid .

Solar power refer to electric power or electricity that is generated from sun rays or radiations while using solar panels and other technologies.

Therefore, Concentrated solar power facilities solar power—generating facilities that generate electricity at large centralized facilities and transmit that power to homes and businesses through the electric grid.

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The equilibrium frequency of an allele in a population after many generations is influenced by various factors, including natural selection, genetic drift, mutation rates, gene flow, and other evolutionary forces.

The equilibrium frequency of an allele is often described by the Hardy-Weinberg equilibrium (HWE) principle, which assumes certain conditions such as a large population, random mating, no migration, no mutation, and no selection. In the HWE, the equilibrium frequency of an allele can be calculated based on the allele frequencies and genotype frequencies.

However, in real populations, these assumptions are often not fully met, and various factors can cause changes in allele frequencies over time. Therefore, without specific information or data on the population dynamics, selection pressures, or other relevant factors, it is not possible to predict the equilibrium frequency of the allele "l" in the population after many generations.

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The photoelectrons released from platinum will have the highest kinetic energy since it has the highest work function (9.1 x 10-19 J).

In physics, an object's kinetic energy is the energy it has as a result of motion. It is explained as the amount of effort required to move a mass-based body from rest to the indicated velocity. The body retains this kinetic energy until its speed changes after gaining it during its acceleration.

An object's kinetic energy is the energy it has as a result of motion. Applying force is necessary if we wish to accelerate an object. We have to put forth work to apply a force. After the job is finished, the object will be travelling at a new, constant speed because energy has been transferred to it.

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Answer:

Stars appear to move in the sky because earth rotates on its axis.

Explanation:

Stars appear to move in the sky because of Earth's rotation on its axis. As Earth rotates, it creates the illusion that the stars are moving in the opposite direction across the sky. This movement is similar to how objects appear to move past us when we are driving down the road. The stars themselves do not actually move, but our perspective from Earth makes it seem as though they are. This movement, along with the changing position of the sun, creates the patterns and movements that we see in the sky throughout the day and night.

Answer:

cyber physical verbal

Explanation:

these are types of bullying

Answer:

Physical, Social, Verbal, and Cyber are different kinds of bullying.

Explanation:

Physical Bullying- Physical bullying is the use of physical actions to intimidate and gain control over a target. The physical actions are unwanted by the victim and can either cause damage to their body or possessions. This behavior is all too common in schools.

Social Bullying- Social bullying is deliberate, repetitive, and aggressive social behavior intended to hurt others. This type of behavior generally includes gossip or other actions that cause mental and emotional harm and social isolation for the victim.

Verbal Bullying- Verbal bullying is intended to degrade, demean, or insult the target person, which might affect their mental, physical, emotional, and psychological health. A bully might make comments about the appearance, gender, race, and weight of the bullied.

Cyber Bullying- Cyberbullying is bullying with the use of digital technologies. It can take place on social media, messaging platforms, gaming platforms, and mobile phones. It is repeated behavior, aimed at scaring, angering, or shaming those who are targeted.

Answer:

The Difference between Radio Waves and Infrared Light. According to NASA, radio waves have a longer wavelength than infrared light, in the electromagnetic spectrum. Radio waves are able to reach the earth’s surface, unlike most infrared light.

Explanation:

I hope this helps.

The amount of force necessary to keep it submerged in water is F=0.258N.

The force required to hold a table tennis ball submerged in water is calculated using the formula:

\(F =\frac{ (\rho * V * g) }{ A}\)

Where F is the force, ρ is the water's density, V is the ball's volume, g is its gravitational acceleration, and A is its cross-sectional area.

The following formula is used to determine the ball's volume:

\(V = \frac{4}{3}*pi*r^3\)

where r is the ball's radius.

The radius of the ball is half its diameter, thus:

\(r = 3.8 cm^2\)

Therefore,

\(V = \frac{4}{3}*pi *(3.8 cm ^2)3\\V = 0.5222 cm3\)

The cross-sectional area of the ball is calculated using the formula:

\(A = \pi * r^2\\\\A = \pi* (\frac{3.8 cm }{ 2})^2\\A = 4.5257 cm^2\)

Substituting the values in the above formula,

\(F =\frac{ (0.084 g/cm^3 * 0.5222 cm^3 * 9.8 m/s^2) }{4.5257 cm^2}\\F = 0.258 N\)

Hence, the force needed to keep it submerged in water is 0.258N

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Fracking has become widely used in the US, raising worries about its effects on the environment and public health. Large volumes of wastewater are produced, along with greenhouse gases like methane, hazardous air pollution, and noise.

Fracking, also known as hydraulic fracturing, is a technique for obtaining gas and oil through shale rock. With the help of a high-pressure injection of water, sand, and chemicals into bedrock, gas and oil can flow into a well and be collected for sale.

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Explain any environmental issue that arose from fluid technology.

Answer:

C

Explanation:

The definition of velocity and the graphical analysis allows to find the correct answer for the velocity of a body moving in the negative direction is:  

     c) A downward-sloping line segment

Kinematics studies the movement of bodies, establishes relationships between position, velocity and acceleration.

Velocity is defined as the change of position in the time interval.

      \(v= \frac{\Delta x}{\Delta t}\)  

In a graph of this expression, time is placed on the x-axis and the position on the y-axis.

In general, if the final position is greater than the initial position, the speed is positive and the slope must be upward sloping.

If the final position is less than the initial position, the velocity is negative and the slope of the graph is downward sloping, in the attachment we can be this type of graph.

Let's review the different answers:

a) False. This velocity is positive.

b) False. In this case the speed is vertical.

c) True. The final position is less than the initial position, therefore the velocity is negative.

d) False. In that case there is no change in position, therefore the velocity is zero

In conclusion, using the definition of velocity and graphical analysis we can find the correct answer for the velocity of a body moving in the negative direction is:

     c)  A downward-sloping line segment

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The stopping potential when light of 400 nm is incident on potassium is 2.93 V.

The work function, Φ, is the minimum energy required to remove an electron from the surface of a metal.

To find the work function for potassium, we use the equation:

λ = hc/E + Φ

where λ is the threshold wavelength, h is Planck's constant, c is the speed of light, E is the energy of a photon, and Φ is the work function.

Rearranging the equation, we get:

Φ = hc/λ - E

We know λ = 558 nm, h = 6.626 x\(10^-34 J\)s, and c = 3.00 x 10^8 m/s.

To find E, we use the equation:

E = hf

where f is the frequency of the photon.

We can find the frequency of the photon with a wavelength of 558 nm using:

c = λf

f = c/λ

f = (3.00 x \(10^8 m/s\))/(558 x\(10^-9 m\))

f = 5.38 x\(10^14\)Hz

Using the equation E = hf, we get:

E = (6.626 x \(10^-34\) J s)(5.38 x \(10^14 Hz\))

\(E = 3.56 x 10^-19 J\)

Substituting the values into the equation for Φ, we get:

Φ = (6.626 x \(10^-34 J s\))(3.00 x \(10^8 m/s\))/(558 x \(10^-9 m\)) - 3.56 x \(10^-19 J\)

Φ = \(2.24 x 10^-19 J\)

Therefore, the work function for potassium is 2.24 x \(10^-19 J.\)

To find the stopping potential when light of 400 nm is incident on potassium, we use the equation:

KEmax = hf - Φ

where KEmax is the maximum kinetic energy of the emitted electron.

We know h = 6.626 x \(10^-34 J s\), f = c/λ = (3.00 x \(10^8 m/s\))/(400 x \(10^-9 m\)) = 7.50 x\(10^14 Hz\), and Φ = 2.24 x \(10^-19 J.\)

Substituting the values, we get:

KEmax = (6.626 x\(10^-34 J s\))(7.50 x \(10^14 Hz\)) - 2.24 x \(10^-19 J\)

KEmax = 4.68 x \(10^-19 J\)

To find the stopping potential, we use the equation:

KEmax = eVstop

where e is the elementary charge and Vstop is the stopping potential.

We know e = 1.60 x\(10^-19 C.\)

Substituting the values, we get:

Vstop = KEmax/e

Vstop = (4.68 x \(10^-19 J\))/(1.60 x \(10^-19 C\))

Vstop = 2.93 V

Therefore, the stopping potential when light of 400 nm is incident on potassium is 2.93 V.

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Answer:

atom

Explanation:

the first guy who gave link this is for you:

we cannot use links in brainly

Thankyou.

Answer:

The initial velocity of the ball is +38.0 m/s. The final velocity is -27.0 m/s.  

momentum = mass x velocity

(mass x final velocity) – (mass x initial velocity)

(1.5)(-27) – (1.5)(38) = -97.5

The impulse applied to the ball is -97.5 kg m/s

impulse = force x time interval

force = impulse/time interval

-97.5/0.45 s = - 216.6  

The force applied was 216.6 N.

Answer:

No, work isn't being done by Johnny.

Explanation:

Work can be defined as the energy transferred to a physical object by exertion of a force on the object to cause a displacement of the object. Thus, work is typically done when a person or simple machine move an object over a distance through the application of a force.

Mathematically, work done is given by the formula;

Work done = force * distance

\( W = F * d\)

Where,

W is the work done

F represents the force acting on a body.

d represents the distance covered by the body.

In this scenario, Johnny's push didn't cause a displacement of the wall and as such no work is done.

Answer:

Kinetic Energy

Explanation:

Kinetic energy is energy due to motion.

Answer:

D

Explanation:

Elastic energy is energy stored in a object when there is a strain or compression on the object.

Nuclear energy is the energy found in the nucleus of an atom.

Potential energy is energy that an object stores because of its position to other objects.

Kinetic energy is the energy that an object has due to motion.

The child is riding her bicycle, therefore the child is in motion. So, the correct answer must be D. Kinetic energy

Answer:

Explanation:

Equation for translational kinetic energy = 1/2 m V² where m is mass and V is velocity .

In first case let mass of car be m

Translational kinetic energy = 1/2 m x 40² = 800 m .

In the second case ,

Translational kinetic energy = 1/2 m x 20² = 200 m

So , in former case kinetic energy of car is 4 times that of second case.

The major role of thermal energy (heat) in metamorphism is to facilitate the recrystallization and reorganization of minerals within rocks.

Heat increases the kinetic energy of atoms and molecules, allowing them to move more freely and facilitating chemical reactions. During metamorphism, rocks are subjected to elevated temperatures, typically within the range of a few hundred to several hundred degrees Celsius. The application of heat leads to changes in the mineral composition, structure, and texture of the rocks, resulting in the formation of new minerals and the reorientation of existing minerals. Thermal energy promotes the growth of new mineral crystals by dissolving existing minerals and facilitating their reprecipitation in new arrangements. This recrystallization process leads to the development of distinct foliation or banding in metamorphic rocks, which are characteristic features of certain metamorphic rock types.

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The answer to the given question is option C: 40.4°F. Let's see the explanation below.How to find the temperature difference across a properly operating electric furnace?

]We know that the temperature difference across a properly operating electric furnace is given by:ΔT = (Q / (1.08 * CFM))where,Q is the rate of heat input in BTU/hr,1.08 is the factor to convert CFM to lb/min,and CFM is the rate of air flow in cubic feet per minute.So, here,ΔT = (Q / (1.08 * CFM))

Given,The rate of heat input = 10 kW = 34,120 BTU/hrThe rate of air flow = 900 CFMPlugging these values in the above equation, we get:ΔT = (34,120 / (1.08 × 900))ΔT = 40.4°FTherefore, the temperature difference across a properly operating electric furnace that is using a 10-kW electric heater and is moving 900 cfm of air is 40.4°F. Hence, the main answer is option C.

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The temperature difference across the electric furnace is approximately 30.2°F (option A).

To calculate the temperature difference across the electric furnace, we can use the formula:

Temperature difference (ΔT) = Heat (Q) / (Airflow rate * Specific heat capacity * Density)

First, let's convert the power of the electric heater from kilowatts (kW) to watts (W):

10 kW = 10,000 W

Next, we need to determine the specific heat capacity of air. Typically, it is around 0.24 BTU/lb°F.

Since the given airflow rate is in cubic feet per minute (cfm), we need to convert it to pounds per minute (lb/min) using the density of air. The density of air at standard conditions is approximately 0.075 lb/ft³.

Converting 900 cfm to lb/min:

900 cfm * 0.075 lb/ft³ = 67.5 lb/min

Now we can substitute the values into the formula:

ΔT = 10,000 W / (67.5 lb/min * 0.24 BTU/lb°F * 0.075 lb/ft³)

Simplifying the equation:

ΔT = 10,000 W / (67.5 * 0.24 * 0.075) (lb/min * BTU/lb°F * lb/ft³)

Calculating the result:

ΔT ≈ 30.2°F

Therefore, the temperature difference across the electric furnace is approximately 30.2°F, which corresponds to option A.

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The acceleration of mass m across the frictionless table is 2.8 m/s², with m = 2.5 kg and M = 0.70 kg.


To find the acceleration, we first need to consider the forces acting on the system. For mass m (2.5 kg), the only force acting on it is tension (T). For mass M (0.70 kg), the forces acting on it are tension (T) and gravitational force (Mg). Since the table is frictionless, there is no friction force to consider.

Next, we apply Newton's second law (F = ma) to each mass separately. For mass m: T = ma. For mass M: Mg - T = Ma. Now we can solve these two equations simultaneously. By adding the equations, we get Mg = (m + M)a. Rearrange the equation to find the acceleration: a = Mg / (m + M).

Finally, plug in the given values: a = (0.70 kg)(9.81 m/s²) / (2.5 kg + 0.70 kg). Calculating this, we find the acceleration, a = 2.8 m/s².

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Answer:

0.65 seconds

2.07m

Explanation:

Here we need to look at the vertical and the horizontal components of the initial velocity.

In terms of his hitting the water.

Define the upwards direction as positive

We know his initial upwards velocity (u) is 4.5sin(45)

His displacement (s) when he hits the water is zero

Acceleration due to gravity is -9.8

We want to find t

So using s=ut+1/2a\(t^{2}\)

0=4.5sin(45)t+1/2(-9.8)\(t^{2}\)

Take out a common t

0=t(4.5sin45-4.9t)

t=0   or t= 0.65

The first answer is not valid so the answer is 0.65.

Now we can look at the horizontal component

It takes him 0.65 seconds to hit the water, he travels at a constant horizontal velocity of 4.5cos45

Therefore using s=vt

s=4.5cos45 x 0.65= 2.07m away

Answer:

The acceleration is 5 m/s^2

Answer:

5m/s²

Explanation:

Given parameters:

Force applied  = 15N

Mass of the student  = 3kg

Unknown:

Acceleration of the mass  = ?

Solution:

From Newton's second law of motion:

    Force  = mass x acceleration

So;

  Acceleration  = \(\frac{Force }{mass}\)  

  Acceleration  = \(\frac{15}{3}\)   = 5m/s²