a 220 mwmw laser pulse is focused with a lens to a diameter of 1.7 μmμm . part a part complete what is the laser beam's electric field amplitude at the focal point?

Answer:

Time to reach ground = t = 6 sec

Explanation:

Acceleration due to gravity = g = 9.8 m/s²

Initial Velocity of the Rock = Vi = 0 m/s (Because, the rock will be at rest, initially)

When a rock is dropped and takes 6 seconds to touch the ground, its maximum speed will be \(6^{th}\) second.

The force of gravity causes a rock to accelerate when it is dropped from a cliff. On Earth, the acceleration caused by gravity is roughly 9.8 meters per second squared (m/s2). This indicates that the rock's speed increases by 9.8 m/s per second as it falls.

According to the question, it takes the rock 6 seconds to hit the ground. It takes the rock exactly this long to fall from the cliff to the ground.

One must comprehend that the rock's speed rises steadily as it falls in order to determine the moment at which it is moving at its fastest. The rock's initial velocity (Vi) is 0 m/s because it begins at rest. The acceleration brought on by gravity causes it to move faster as it drops.

The rock will reach its highest speed just before it touches the ground because its velocity is constantly rising. As a result, the rock is moving at its fastest at the moment of impact (t = 6 sec).

Thus, the maximum speed will be at T= 6 seconds.

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Answer:

Explanation:

tension beacuse the tension is travling to the up to the crane chane

The potential energy stored in a spring stretched through a distance 'x' is given by:

U = (1/2)kx^2

where k is the spring constant.

In this problem, we are given that the potential energy of the spring when stretched through a distance 'a' is 25 J. Therefore, we can write:

25 = (1/2)ka^2

Solving for k, we get:

k = (2*25)/a^2 = 50/a^2

Now, we need to find the amount of work done on the spring to stretch it by an additional distance '5a'. The work done can be found using the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy plus the change in its potential energy.

In this case, there is no change in kinetic energy since the spring is not moving. Therefore, the work done is equal to the change in potential energy:

W = U_final - U_initial

where U_final is the potential energy of the spring when stretched through a distance '6a' (i.e., 'a' plus an additional '5a'), and U_initial is the potential energy of the spring when stretched through a distance 'a'.

The potential energy of the spring when stretched through a distance '6a' is:

U_final = (1/2)k(6a)^2 = (1/2)(50/a^2)(36a^2) = 900 J

Therefore, the amount of work done on the spring to stretch it by an additional distance '5a' is:

W = U_final - U_initial = 900 J - 25 J = 875 J

So, the amount of work done on the spring is 875 J.

Answer:

Hiya your answer's up

Down

6- dioxide

According to the wave equation, v = fλ, where v is the wave speed, f is the frequency, and λ is the wavelength. If we increase the wavelength and keep the wave speed the same, the frequency of the wave will decrease.

This is because, if we increase the wavelength but keep the wave speed constant, the wave will have to take longer to complete one full cycle, which means that the number of cycles completed per second (the frequency) will be lower.

Another way to think about this is to consider the relationship between wavelength and frequency in a wave. In general, waves with longer wavelengths have lower frequencies, and waves with shorter wavelengths have higher frequencies. This is because the wavelength represents the distance between two consecutive peaks or troughs in the wave, and the frequency represents the number of cycles completed per unit of time.

If the wavelength increases, the number of peaks or troughs per unit of time will decrease, and thus the frequency will decrease as well.

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The second-order minimum thickness of the film required is 1.41 μm.

The minimum thickness required for a thin film to reflect a given color is half the wavelength of the light in the film material. For a second-order minimum thickness, the formula is given by;

t2=2nλwhere t2 represents the second-order minimum thickness of the film, n is the refractive index of the film material, and λ is the wavelength of the light in air.

If the wavelength of the light in air is 470 nm, then the second-order minimum thickness of the film required is given by;t2=2nλ= 2 × 1.5 × 470 nm = 1410 nm = 1.41 μm.

The second-order minimum thickness of the film required is 1.41 μm.

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Answer:

30km

Explanation:

Distance= speed x time

15x2=30km

Answer:The continuity equation for a compressible liquid is a mathematical expression that relates the changes in fluid density, velocity, and volume to the changes in time. This equation can be written as:

∂ρ/∂t + (ρv)•∇ = 0

where:

ρ = fluid density

v = fluid velocity

∂/∂t = partial derivative with respect to time

∇ = del operator

The continuity equation expresses the principle of mass conservation, stating that the rate of change of fluid density in a fixed volume must be equal to the rate of flow of fluid into or out of that volume. This equation is commonly used in fluid dynamics to study the behavior of liquids and gases in various applications, such as in pipelines, pumps, valves, and compressors.

Explanation:

Answer:

1200000J

Explanation:

mass,m = 1500kg

velocity,v = 40 m/s

Kinetic energy,KE = ?

KE = 1/2 mv²

= 1/2 ×1500×40×40

= 1200000 J

The frequency will be off by 3.5% at 11°C compared to the in-tune frequency at 22.0°C

To calculate the percentage by which the frequency will be off at 11°C, we need to use the formula for calculating percentage change. The formula is: (new value - old value) / old value * 100.

First, let's determine the difference in temperature between the initial temperature and the new temperature. The initial temperature is 22.0°C, and the new temperature is 11°C. The difference is 22.0°C - 11°C = 11°C.

Next, we need to calculate the percentage change in frequency based on the change in temperature. The relationship between temperature and frequency is given by the formula: frequency = 150 - 0.6 * temperature.

So, let's calculate the initial frequency at 22.0°C using the formula:
frequency = 150 - 0.6 * 22.0 = 150 - 13.2 = 136.8.

Now, let's calculate the new frequency at 11°C using the same formula:
frequency = 150 - 0.6 * 11 = 150 - 6.6 = 143.4.

To calculate the percentage change, we can use the formula:
percentage change = (new value - old value) / old value * 100.

Plugging in the values, we get:
percentage change = (143.4 - 136.8) / 136.8 * 100.

Calculating this, we find:
percentage change = 4.8 / 136.8 * 100 = 0.035 * 100 = 3.5%.

Therefore, the frequency will be off by 3.5% at 11°C compared to the in-tune frequency at 22.0°C.

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The magnetic force on the wire will be directed to the east.

The direction of the magnetic force on the long wire carrying a current toward the north in a magnetic field directed vertically downward would be to the east.

This is because of the right-hand rule, where if you point your right thumb in the direction of the current and your fingers in the direction of the magnetic field, the resulting force would be perpendicular to both, pointing to the east in this case.
When a long wire carries a current toward the north in a magnetic field that is directed vertically downward, you can determine the direction of the magnetic force on the wire using the right-hand rule.

Step 1: Point your right thumb in the direction of the current (north).
Step 2: Curl your fingers in the direction of the magnetic field (downward).
Step 3: The direction of the force on the wire will be the direction your palm is facing.

Following these steps, the magnetic force on the wire will be directed to the east.

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For a successful final touch of a construction venture, key stakeholders consisting of the consumer/proprietor, architect/layout group, and creation contractor are crucial. Risk management is necessary to perceive and mitigate capacity risks, ensuring project success and minimizing disruption

The 3 important stakeholders for the development of a new mall in Alexandra are:

During the construction of an avenue in a particular network, the network is represented by:

Local Authorities: The local authorities, which include the municipal or city council, represent the community's pastimes. Their duties consist of engaging with the network to apprehend their needs and issues associated with the road construction project.

Before any sort of Civil Engineering mission is executed, the subsequent steps want to be taken to ensure the viability of the challenge:

The hierarchy of running for a contractor sporting out the development of a bridge typically consists of the subsequent degrees:

To draw the bar chart (also referred to as a Gantt chart) for a 50 km street creation undertaking with a duration of 10 days, the chart could represent the obligations and their respective intervals. However, a standard bar chart for an avenue creation undertaking may also include duties including surveying, excavation, laying subbase, paving, and street markings, amongst others.

The horizontal axis represents the timeline (in days), and the vertical axis represents the responsibilities. Each undertaking is represented with the aid of a horizontal bar that suggests its length.

Question 2 (10):

2.1 Risk control is vital in a venture for the following motives:

Overall, change management is important for figuring out, analyzing, and responding to risks in a systematic and proactive manner. It enables ensuring task success by using lowering uncertainties and maximizing opportunities for task delivery within the preferred parameters.

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Kristin's height above the ground is approximately 0.38 meters if she has swept out 4.2 radians since the ride started.

To answer these questions, we need to use the formula we found in the previous question: h = r(1 - cosθ)
where h is Kristin's height above the ground in meters, r is the radius of the ride in meters (which we were given as 18), and θ is the angle swept out by Kristin in radians.
a. If the angle has swept out 1 radian since the ride started, we can plug in θ = 1 into the formula:
h = 18(1 - cos1)
h ≈ 5.85 meters
Therefore, Kristin's height above the ground is approximately 5.85 meters if she has swept out 1 radian since the ride started.
b. If the angle has swept out 4.2 radians since the ride started, we can plug in θ = 4.2 into the formula:
h = 18(1 - cos4.2)
h ≈ 0.38 meters.
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Complete question

A cannon with a muzzle velocity of 500. meters per second fires a cannonball at an angle of 30.° above the horizontal. What is the vertical component of the cannonball's velocity as it leaves the cannon?

A   0.0 m/s

B    250. m/s

C   433 m/s

D    500. m/s

Answer:

The correct option is  C

Explanation:

From the question we are told that

   The velocity is  \(v = 500 \ m/s\)

    The angle is  \(\theta = 30^o\)

Generally the vertical component of the canon ball is mathematically represented as  

          \(v_y = v * cos (30 )\)

=>       \(v_y = 500 * cos (30 )\)

=>       \(v_y = 433 \ m/s\)

Answer:

250. m/s

Explanation:

It is vertical component so you do: 500mSin(30°) = 250m/s

Answer:

\(1.27\:\text{s}\)

Explanation:

We can use the following kinematics equation to solve this problem:

\(v_f=v_i+at\)

Solving for \(t\):

\(-24.5=-12.1+-9.8t,\\-12.4=-9.8t,\\t=\frac{-12.4}{-9.8}\approx \boxed{1.27\:\mathrm{s}}\)

Nebulae are red because of the Balmer line, which is created when ionized hydrogen catches an electron and turns back into neutral hydrogen. Ionized hydrogen, which is abundant in nebulae.

In space, a supernova is a huge cloud of gas and dust. Some nebulae, including multiple nebulae, are made of gas and dust that have been released from the exploding of a dead star called a supernova. There are other nebulae that are star-forming regions.

The nebular theory proposes that a swirling cloud of dust, known as a nebula, composed primarily of light components, condensed into a planetary nebula, and eventually developed into a solar system made up of a star and planets in orbit.

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The substance that requires the greatest amount of energy to melt is ice.

The latent heat of fusion refers to the energy that is required to melt 1 Kg of a substance. We must note that this heat goes into the breaking of the internal bonds of the material. Thus, the nature of the internal bonds in the materials are important when we are dealing with the latent heat of fusion.

We can see that the particles of ice are held together by the strong hydrogen bonds. As such, we can see that ice has the highest latent heat of fusion.

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Explanation:

Mass of the car = 2000N / 10 = 200kg.

Fnet = ma. Assuming there is only the horizontal force acting on the car, then

F = (200kg)(3.3m/s²) = 660N.

Answer:

Mass of the car = 2000N / 10 = 200kg.

\(F_{net} = ma\)

If there is only the horizontal force acting on the car, then

\(F = (200kg)(3.3m/s^{2}) = 660N.\)

Explanation:

Hope this helped!

Answer:

1/f = 1/i + 1/o      thin lens equation

1/i = 1/f - 1/o

i =  o * f / ( o - f) = 50 * (-20) / (50 - (-20)) = -14.3 cm

The final image is  erect and 14.3 cm behind the curved surface

M = -o / i = 14.3 / 50 = .29      magnificaton of object

S = .29 * 25 cm = 7.1 cm       appearance of bird in mirror (height)

Answer:

Recycled answer from jaskhanna07343

Explanation:

Water does not wet waxed surfaces because the cohesive forces within the drops are stronger than the adhesive forces between the drops and the wax. Water wets glass and spreads out on it because the adhesive forces between the liquid and the glass are stronger than the cohesive forces within the water

The pair of symbols used to depict a partial separation of charge in a covalent bond is δ+ and δ-.

The symbol δ+ represents a partial positive charge, while the symbol δ- represents a partial negative charge. These symbols are often used in chemistry to illustrate the uneven distribution of electrons in a covalent bond.

In a covalent bond, two atoms share electrons, but the electrons are not always shared equally. When one atom has a greater electronegativity (ability to attract electrons) than the other, it can create a partial negative charge (δ-) on that atom and a partial positive charge (δ+) on the other atom.

This unequal sharing of electrons results in a polar covalent bond, and the symbols δ+ and δ- are used to indicate the partial separation of charge.

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Answer:

4. The reading decreases because part of your weight is applied to the table and the table exerts a matching force on you that acts in the direction opposite to your weight.

Explanation:

When you push on anything, Newtons Third Law comes into effect: "when two objects interact, they apply forces to each other of equal magnitude and opposite direction." So pretty much, the table you are putting some of your weight on is taking some of the downward force and in return the scale isn't going to push up with as much force.

I'm not the best at explaining, but im in physics right now and thats somewhat how my teacher explained it.

At a fixed location, the phase changes by 55.04 radians during a time interval of 0.01 s.

First use the formula to find the wavelength of the wave:

wavelength = speed/frequency

Use the fact that the speed of a wave is related to its wavelength and frequency by the formula:

speed = wavelength x frequency

Rearrange this to get:

wavelength = speed/frequency

Now find the speed. Use the fact that the wave has a frequency of 880 Hz to find the wavelength using the formula:

speed = wavelength x frequency

speed = wavelength x 880

Use the given information that the difference in phase between two positions is π/3 radians.

The difference in phase between two positions is related to the difference in distance between those positions by the formula:

phase difference = 2π(distance difference)/wavelength

Rearrange this formula to get:

distance difference = wavelength(phase difference)/(2π)

Now substitute in the values:

distance difference = (speed/frequency)(π/3)/(2π)

Simplifying this expression gives:

distance difference = speed/(6frequency)

Find the speed to answer part (a). Using the earlier equation that relates speed, wavelength, and frequency:

speed = wavelength x frequency

substitute in the frequency and rearrange to get:

wavelength = speed/frequency

wavelength = (speed)/(880 Hz)

Use the given information in part (b) to find how much the phase changes during a time interval of Δt = 0.01 s.

The phase of a traveling wave changes over time according to the formula:

phase change = 2π(frequency)(time interval)

Substituting the given values gives:

phase change = 2π(880 Hz)(0.01 s) = 55.04 radians

Therefore, at a fixed location, the phase changes by 55.04 radians during a time interval of 0.01 s.

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The force that is needed to accelerate the arrow is 49 Newtons.

To determine magnitude of the force needed to give a 0.25 kg arrow an acceleration of 196 m/s², we can use the equation of force:

F = ma

where F is the force, m is the mass, and a is the acceleration.

Given that m = 0.25 kg and a = 196 m/s², we can substitute these values into the equation and solve for F:

F = (0.25 kg)(196 m/s²)

F = 49 N

So the force needed to give a 0.25 kg arrow an acceleration of 196 m/s² is 49 N. This is the correct answer out of the options given.

To arrive at this answer we used Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. Thus, we were able to use the equation "F = ma" (where F is force, m is mass and a is acceleration) to solve for the force required to accelerate the arrow at 196 m/s².

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A lineal plot's slope is calculated by dividing the change in the y-axis by the change in the x-axis. The slope of a plot of mass vs volume equals mass/volume, which corresponds to the density of water.

If you have used a graduated cylinder with markers every 1 mL, you can only estimate to 1 decimal place with that decimal place having an uncertainty. By observing, you can discern that your measurement is "near to," say, 1.5 mL, but you are limited to that number of digits. So, there are only two significant figures in this measurement, limiting the number of significant figures you can include in your final conclusion. The result should be recorded as 14 g/mL if there are more than two digits in the balance, which is most often the case (two significant figures and rounding of the last one).

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Answer:

The carbon dioxide produced by fossil fuel into the air is a greenhouse gas just as is nitrous oxide, methane, water vapor, and synthetic gases that contain fluorine. Compared to the other greenhouse gases, carbon dioxide is the most abundantly present greenhouse gas.

The greenhouse gases cause greenhouse effect which is the  observed trapping of heat in the atmosphere, similar to the glass roof of a greenhouse, thereby causing the average global temperature to rise, and changing the climate through global warming

There is presently a 1°C rise in the average global temperature as part of the Earth reflected heat from the Sun is returned back to Earth by the increasing greenhouse gas presence in the atmosphere which cause the greenhouse effect

Explanation:

Answer:

The carbon dioxide produced by fossil fuels in the air is a greenhouse gas, as is nitrous oxide, methane, water vapor, and synthetic gases containing fluorine. Compared to the other greenhouse gases, carbon dioxide is the most abundant greenhouse gas.

The greenhouse gases cause the greenhouse effect which is the observed trapping of heat in the atmosphere, similar to the glass roof of a greenhouse, thereby causing the average global temperature to rise, and changing the climate through global warming

There is presently a 1°C rise in the average global temperature as part of the Earth's reflected heat from the Sun is returned to Earth by the increasing greenhouse gas presence in the atmosphere which causes the greenhouse effect

Explanation:

I got a 100% on this assignment copy it and put it on your notes then go sentence by sentence copy but dont highlight any "." you will not be able to paste it into the box add the "." after you paste it, it one sentence.

Answer:A

Explanation:

Answer: A.

Explanation: I hope this helps :) -

Environmental factors are diverse and far reaching.

...

They include:

Exposure to hazardous substances in the air, water, soil, and food.

Natural and technological disasters.

Climate change.

Occupational hazards.

The built environment. Goal

Promote health for all through a healthy environment.

Overview

Humans interact with the environment constantly. These interactions affect quality of life, years of healthy life lived, and health disparities. The World Health Organization (WHO) defines environment, as it relates to health, as “all the physical, chemical, and biological factors external to a person, and all the related behaviors.”1 Environmental health consists of preventing or controlling disease, injury, and disability related to the interactions between people and their environment.

The Healthy People 2020 Environmental Health objectives focus on 6 themes, each of which highlights an element of environmental health:

Outdoor air quality

Surface and ground water quality

Toxic substances and hazardous wastes

Homes and communities

Infrastructure and surveillance

Global environmental health

Creating healthy environments can be complex and relies on continuing research to better understand the effects of exposure to environmental hazards on people’s health.

Why Is Environmental Health Important?

Maintaining a healthy environment is central to increasing quality of life and years of healthy life. Globally, 23% of all deaths and 26% of deaths among children under age 5 are due to preventable environmental factors.1 Environmental factors are diverse and far reaching. They include:

Exposure to hazardous substances in the air, water, soil, and food

Natural and technological disasters

Climate change

Occupational hazards

The built environment

Related Topic Areas

Cancer

Heart Disease and Stroke

Occupational Safety and Health

Physical Activity

Respiratory Diseases

Poor environmental quality has its greatest impact on people whose health status is already at risk. Therefore, environmental health must address the societal and environmental factors that increase the likelihood of exposure and disease.

 -Have a good day :)