Laser vision correction often uses an excimer laser that produces 193-nm electromagnetic radiation. This wavelength is extremely strongly absorbed by the cornea and ablates it in a manner that reshapes the cornea to correct vision defects. Explain how the strong absorption helps concentrate the energy in a thin layer and thus give greater accuracy in shaping the cornea. Also explain how this strong absorption limits damage to the lens and retina of the eye.

Answer:

\(1000\; {\rm W}\).

Explanation:

Joule is a unit for work, while watt is a unit for power- the rate at which work is being done. Divide work by time to find power.

By definition, one watt is equivalent to one joule-per-second. In other words: \(1\; {\rm W} = 1\; {\rm J \cdot s^{-1}}\). Note that the unit of time in this question is "minute", not second.

Apply unit conversion and ensure that the unit of time is "second":

\(\begin{aligned} 1\; \text{minute} &= 1\; \text{minute} \times \frac{60\; {\rm s}}{1\; \text{minute}} = 60\; {\rm s}\end{aligned}\).

The power of this generator would thus be:

\(\begin{aligned} \text{power} &= \frac{\text{work}}{\text{time}} \\ &= \frac{60\, 000\; {\rm J}}{60\; {\rm s}} \\ &= 1\, 000\; {\rm W} \end{aligned}\).

a) 12.1 Average.

B) It is important to record measurements to the correct number of significant figures because otherwise, the integrity of the number is compromised.

A) Determine the average length and express the answer using the correct number of significant figures:

12.2+12.1+12=36.3/3 = 12.1 Average.

B)  Based on your average length calculation in part a, discuss the importance of recording measurements to the appropriate number of significant figures:

It is important to record measurements to the correct number of significant figures because otherwise, the integrity of the number is compromised.

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Answer:

D

Explanation:

Breach of warranty generally alludes to the disappointment of a dealer or supplier to satisfy the conditions of a guarantee, or portrayal, made during the contracting system. Such terms can cover an expansive range of issues going, for instance, from justifying that medical care rehearses have agreed with wellbeing and security and other guideline; to justifying that a property doesn't contain asbestos; to going into an agreement that says the gathering organization being gained isn't the subject of any prosecution.

The law expects that contracting gatherings can and should remain behind these (guarantees and portrayals). It accordingly follows that there is legitimate plan of action under agreement as well as misdeed for break of guarantees and deception.

Answer:

see below

Explanation:

 It boils (or evaporates)  and becomes gaseous nitrogen like water turns to water vapor when it gets warm enough

Answer:

n/A = 1*10^10 /cm^2

Explanation:

a) Each open ion can be considered as a resistor in the circuit. Then, you have that the equivalent resistance is:

\(\frac{1}{R_{eq}}=\frac{1}{R}+\frac{1}{R}+\frac{1}{R}+...=\frac{n}{R}\\\\R_{eq}=\frac{R}{n}\)     (1)

(you assume the resistance are in parallel)

R: resistance of an axon's membrane =  1×10^ 11Ω.

Req: equivalent resistance = ?

n: number density of open ion channels

Next, you take into the Ohm's law:

\(I=\frac{V}{R_{eq}}\)    (2)

I: current

V: voltage acroos the membrane = 50mV

you replace the equation (1) into the equation (2):

\(I=\frac{Vn}{R}\)     (3)

But yo know that the current is also

I = JA       (4)

J: current density = 5mA/cm^2

A: cross sectional area of the axon's membrane

You replace equation (4) into the equation (3), an d you solve for n/A

\(JA=\frac{Vn}{R}\\\\\frac{n}{A}=\frac{JR}{V}\)

Then, you replace the values of the parameters:

\(\frac{n}{A}=\frac{JR}{V}=\frac{(5mA/cm^2)(1*10^{11}\Omega)}{50mV}\\\\\frac{n}{A}=1*10^{10}\frac{ions}{cm^2}\)

hence, the density of ion channels is 1*10^10 /cm^2

Answer:

0.20 Hz

Explanation:

Period formula:

T = 1 / f

rearrange to solve for T (which is period)

F = 1/T

= 1/5.1

= 0.20 Hz

If you want 3 sig figures it would go up to 0.196, but I just rounded to two to get 0.20.

The remaining battery capacity would be 76%, which is still above the 25% limit on discharge depth.

If the electric bicycle can go 100 miles on a full charge, and the owner wants to limit the discharge depth to 25%, then they can only use up to 25 miles of the battery's capacity before needing to recharge.

Since the owner's commute is 12 miles round trip, they can make one round trip without depleting the battery more than 25% of its capacity.

Therefore, the owner can make 2 round trips (2 x 12 = 24 miles) before needing to recharge, but they will still have some battery capacity left.

The remaining battery capacity would be (100 - 24)/100 x 100% = 76%, which is still above the 25% limit on discharge depth. So the owner could make a few more round trips before needing to fully recharge the battery.

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Answer:

B. Convection

D. Conduction

Explanation:

Conduction and convection are the two most prominent processes that helps transfer energy outward to the earth's crust.

Answer:

B and D

Explanation:

I just did it on a p e x. In case your not sure

If initial speed was v, Kinetic energy was K = 1/2mv^2

When speed will be 4v, KE will be:

= 1/2 m (4v)^2

=1/2m 16 v^2

=16K

Now kinetic energy will become 16 times of initial Kinetic Energy

Answer:

3000 seconds

Explanation:

Answer:

That's electron sharing

Explanation:

Chlorine molecule has covalent bonds which is formed by sharing of electrons

The most likely true statement about asynchronous communication is that it is helpful when employees work across multiple time zones.

Asynchronous communication refers to a mode of communication where participants do not need to be present or engaged simultaneously. Instead, they can send and receive messages at their convenience.In today's globalized society, businesses often have teams distributed across different geographical locations and time zones. Asynchronous communication becomes invaluable in such scenarios as it allows team members to collaborate effectively without the constraints of real-time interactions. By utilizing tools like email, project management platforms, or messaging apps, individuals can communicate and exchange information regardless of their location or the time differences.

Asynchronous communication also offers benefits such as flexibility and increased productivity. Team members have the freedom to work at their own pace and prioritize tasks accordingly. It provides opportunities for thoughtful and well-crafted responses, as individuals can take time to gather information or reflect on complex matters before replying.While asynchronous communication is advantageous for teams operating across multiple time zones, it does not rely on all employees working in the same time zone. In fact, it is designed to accommodate diverse schedules and allow individuals to collaborate efficiently despite their varying work hours.

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The correct answer is D. An average city

Explanation:

A neutron star differs from others due to its massive density, this means a lot of matter is compressed in a small area. Indeed, neutron stars have a mass of around 1.4 to 2.8 times the mass of the sun. But these are considerably small as they only measure around 20 kilometers, which is the size of an average city. Additionally, neutron stars are this dense because they are the result of a regular star exploding, which leads to a super-dense core, or neutron star. In this context, the mass of a neutron star is compressed to the size of an average city.

Answer:

I think it would most likely be 2... but not so sureee

The force required to lift the piano would be 14000 Newtons.

The weight of a body is the force exerted on it by the earth towards its center.

Given is that in raising a 7000 - N piano with a pulley system, the movers note that, for every 2.6 m of rope pulled down, the piano rises 0.10 m.

To move the piano upwards, the following relation has to satisfied -

F - mg > ma

F > ma + mg

F > 10m + 7000

F > 10 x 700 + 7000

F > 14000 N

Therefore, the force required to lift the piano would be 14000 Newtons.

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Answer:

a. 13.96 m/s in the +x direction

b. -1.76 m/s that is 1.76 m/s in the -x direction

Explanation:

(a) Calculate the magnitude of the velocity of the puck after a force of 37.0 N directed to the right has been applied for 0.050 s.

Since Impulse, I = Ft = m(v₂ - v₁) where F = force applied = + 37.0 N(positive since it is applied to the right), t = duration of applied force = 0.050 s, m = mass of hockey puck = 0.160 kg, v₁ = initial velocity of hockey puck =  + 2,40 m/s (positive since it is moving to the right) and v₂ = final velocity of hockey puck

So, making v₂ subject of the formula, we have

v₂ = v₁ + Ft/m

substituting the values of the variables into the equation, we have

v₂ = v₁ + Ft/m

v₂ = 2.40 m/s + 37.0 N × 0.050 s/0.160 kg

v₂ = 2.40 m/s + 1.85 Ns/0.160 kg

v₂ = 2.40 m/s + 11.56 m/s

v₂ = 13.96 m/s

(b) If instead, a force of 13.3 N directed to the left is applied from t = 0 to t =0.050 s, what is the final velocity of the puck?

Since Impulse, I = Ft = m(v₂ - v₁) where F = force applied = - 13.3 N(positive since it is applied to the right), t = duration of applied force = 0.050 s, m = mass of hockey puck = 0.160 kg, v₁ = initial velocity of hockey puck =  + 2,40 m/s (positive since it is moving to the right) and v₂ = final velocity of hockey puck

So, making v₂ subject of the formula, we have

v₂ = v₁ + Ft/m

substituting the values of the variables into the equation, we have

v₂ = v₁ + Ft/m

v₂ = 2.40 m/s + (-13.3 N) × 0.050 s/0.160 kg

v₂ = 2.40 m/s - 0.665 Ns/0.160 kg

v₂ = 2.40 m/s - 4.156 m/s

v₂ = -1.756 m/s

v₂ ≅ -1.76 m/s

(a). The velocity of the puck is 13.96 m/s in the +x direction

(b). The final velocity of the puck is -1.76 m/s which is 1.76 m/s in the -x direction

The velocity of the object is defined as the movement of the object in a particular direction with respect to time.

(a) Calculate the magnitude of the velocity of the puck after a force of 37.0 N directed to the right has been applied for 0.050 s.

It is given that

Impulse, I = Ft = m(v₂ - v₁)

where F = force applied = + 37.0 N(positive since it is applied to the right),

t = duration of applied force = 0.050 s,

m = mass of hockey puck = 0.160 kg,

v₁ = initial velocity of hockey puck =  + 2,40 m/s (positive since it is moving to the right)  

v₂ = final velocity of a hockey puck

So, making v₂ subject of the formula, we have

\(V_2=v_1+\dfrac{Ft}{m}\)

substituting the values of the variables into the equation, we have

\(v_2=2.40+\dfrac{37\times 0.050}{0.160}\)

\(v_2=2.40+11.56\)

\(v_2=13.96\ \dfrac{m}{s}\)

(b) If instead, a force of 13.3 N directed to the left is applied from t = 0 to t =0.050 s, what is the final velocity of the puck?

Since Impulse, I = Ft = m(v₂ - v₁)

where F = force applied = - 13.3 N(positive since it is applied to the right),

t = duration of applied force = 0.050 s,

m = mass of hockey puck = 0.160 kg,

v₁ = initial velocity of hockey puck =  + 2,40 m/s (positive since it is moving to the right)  

v₂ = final velocity of a hockey puck

So, making v₂ subject of the formula, we have

\(v_2=v_1+\dfrac{Ft}{m}\)

substituting the values of the variables into the equation, we have

\(v_2=2.40+\dfrac{-13.3\times 0.050}{0.160}\)

\(v_2=2.40-4.156\)

\(v+2=-1.76\ \frac{m}{s}\)

Thus

(a). The velocity of the puck is 13.96 m/s in the +x direction

(b). The final velocity of the puck is -1.76 m/s which is 1.76 m/s in the -x direction

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Answer:

Acoustics

Explanation:

Answer:

its A

Explanation:

avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico avocados from Mexico.

Answer:

one right angel = 90 degrees

and two acute angels?

Explanation:

The following statements about random assignment is true:

It works best with a larger number of participants because there is more opportunity for extraneous variables to be equally distributed to each group.

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Answer:

-2m/s²

Explanation:

Given parameters:

Initial velocity of the car  = 25m/s

Time taken  = 10s

Final velocity  = 5m/s

Unknown:

Acceleration of the car  = ?

Solution:

Acceleration is the rate of change of velocity with time.

It is mathematically expressed as:

 Acceleration  = \(\frac{Final velocity - Initial velocity}{time}\)  

  Acceleration  = \(\frac{5 - 25}{10}\)   = -2m/s²

Answer:

To determine the maximum speed that the 8.3 kg mass can have without breaking the string, we need to consider the tension in the string when it reaches its maximum. At maximum speed, the tension in the string will be equal to the breaking strength of the string.

Given:

Mass (m) = 8.3 kg

Breaking strength of the string (Tension) = 1500 N

Radius of the circle (r) = 80 cm = 0.8 m

The centripetal force required to keep an object moving in a circular path is given by the formula:

F = m * v² / r

Where:

F = Centripetal force

m = Mass

v = Velocity

r = Radius

In this case, the centripetal force is provided by the tension in the string. So we have:

Tension = m * v² / r

Plugging in the values:

1500 N = (8.3 kg) * v² / 0.8 m

To find the maximum speed (v), we can rearrange the equation and solve for it:

v² = (1500 N * 0.8 m) / 8.3 kg

v² ≈ 144.58 m²/s²

v ≈ √(144.58 m²/s²)

v ≈ 12.03 m/s

Therefore, the maximum speed that the 8.3 kg mass can have without breaking the string is approximately 12.03 m/s.

Explanation:

Answer:

C.) X-Rays

B.) Focus

A.) Laser

B.) 38 x 10^-16 Joules

The difference between steps and stairs can be seen in how they are comparable to and different from using a ramp to enter a building. In contrast to a stair, which has two or more risers, a step is the portion of a movement that elevates or descends by simply one riser.

Stairs can be built anywhere there is a height difference between landings, and they only occupy a small amount of space. However, ramps require significantly more space to allow for the proper climb.

It is more efficient to climb steps than than a ramp since it requires less energy. Ramps that are as steep as a standard flight of stairs are also challenging to climb. Because it requires more distance (and walking time) to reach the same height as steep stairs, very shallow slopes require overall more energy.

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Velocity = distance / time  = 300m / 100s

            = 3 m/s

Velocity is the direction at which an object is moving and serves as a measure of the rate at which its position is changing as seen from a specific point of view and as measured by a specific unit of time (for example, 60 km/h northbound).

A physical vector quantity called velocity must have both a magnitude and a direction in order to be defined.

Speed is the scalar absolute value (magnitude) of velocity; it is a coherent derived unit whose quantity is measured in metres per second (m/s or m/s1) in the SI (metric system).

Therefore, Velocity = distance / time  = 300m / 100s

            = 3 m/s

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Answer:

correct answer is D

Explanation:

In the covalent bond, a pair of electrons is shared between two atoms, in this case we have 4 electrons in one atoms and they are shared in pairs, so for these as far apart as possible due to electron-electron repulsion between the electrons of different bonds it must have a TETRAHEDRAL geometry

the correct answer is D