a coin is 12 cm in front of a converging lens with focal length of magnitude 4.0 cm. where is the image?

Answer:

Sure, here are two units of matter:

Atom: The smallest unit of ordinary matter that forms a chemical element.

Molecule: A group of two or more atoms that are held together by chemical bonds.

Atoms and molecules are the building blocks of all matter. They can combine to form different substances, such as water, salt, and air.

I hope this helps!

Explanation:

To minimize potential risks associated with cell phone radiation, it's advised to use hands-free accessories or speakerphone options, keep the device at a reasonable distance from your body when not in use, and avoid long-duration calls when possible.

Cell phone radiation is measured in terms of Specific Absorption Rate (SAR), which is the amount of radiation absorbed by the body when using a cell phone. SAR is measured in watts per kilogram (W/kg), and the Federal Communications Commission (FCC) has set a maximum SAR limit of 1.6 W/kg. In general, smartphones tend to have higher SAR levels than basic cell phones, as they typically have more advanced features that require more energy. However, it's important to note that even phones with high SAR levels are still considered safe for use, as long as they comply with FCC regulations.

To provide a few examples, the iPhone 11 Pro has a SAR rating of 1.16 W/kg, which is considered relatively low. On the other hand, the Xiaomi Mi A1 has a SAR rating of 1.75 W/kg, which is considered relatively high. It's worth noting that SAR ratings can vary depending on the specific model of a phone, as well as the way it's used (e.g. distance from the body, whether a headset is used, etc.). In conclusion, while SAR ratings can provide some insight into a phone's radiation levels, it's important to keep in mind that even phones with high SAR levels are still considered safe for use.

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Yes, according to Newton's third law of motion, for every action, there is an equal and opposite reaction.

When you step off a ledge, you apply a force on the Earth due to gravity, and by Newton's third law, the Earth applies an equal and opposite force on you. The magnitude of the force on the Earth is the same as the force on you, but because the Earth is so much more massive than you, its acceleration is negligible.

However, technically speaking, the Earth does accelerate toward you, but the acceleration is so small that it is usually ignored.

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The first-order maximum for 530 nm green light will occur at an angle of 0.83 degrees. To find the angle at which the first-order maximum will be for 530 nm green light, we can use the formula:

d*sinθ = m*λ

Where d is the distance between the grating lines (1/1840 cm), θ is the angle at which the maximum occurs, m is the order of the maximum (1 for first-order), and λ is the wavelength of the light (530 nm = 5.3 x 10^-5 cm).

Rearranging the formula, we get:

sinθ = m*λ/d

sinθ = 1*(5.3 x 10^-5)/1.84 x 10^-3

sinθ = 0.0144

Taking the inverse sine of 0.0144, we get:

θ = 0.83 degrees

Therefore, the first-order maximum for 530 nm green light will occur at an angle of 0.83 degrees.

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The energy stored in a capacitor can be calculated using the equation [tex]$E = \frac{1}{2}CV^2$[/tex], where C is the capacitance in farads, and V is the voltage in volts. The amount of energy stored depends on the capacitance and voltage applied.

To calculate the energy stored in a capacitor, we can use the equation:

[tex]$E = \frac{1}{2}CV^2$[/tex]

where E is the energy in joules, C is the capacitance in farads, and V is the voltage in volts.

Using this equation and the given values, we can calculate the energy stored in the capacitor as:

[tex]$E = \frac{1}{2}(30 \times 10^{-6})(100)^2 = 0.15 \text{ J}$[/tex]

Therefore, the energy stored in the capacitor is 0.15 joules.

The energy stored in a capacitor is the energy that is stored in the electric field between the capacitor plates. When the capacitor is charged, energy is stored in the electric field as a result of the separation of charge on the plates. The amount of energy stored in the capacitor depends on the capacitance of the capacitor and the voltage applied across it. A capacitor with a larger capacitance or a higher voltage will store more energy than a capacitor with a smaller capacitance or a lower voltage.

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The name for the radio frequency window astronomers use to search for extraterrestrial communication is d) water hole. The water hole refers to a narrow range of frequencies around 1.42 GHz, where the background noise of the universe is relatively low, and where hydrogen and hydroxyl molecules emit radiation.

This range of frequencies is considered a likely candidate for extraterrestrial communication, as any intelligent life in the universe might also be expected to use these frequencies to communicate. Thus, scientists working on the Search for Extraterrestrial Intelligence (SETI) project focus on the water hole in their search for radio signals from other civilizations.

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Assuming Tim is traveling directly towards the person at the other end of the pool:

Let's use the formula: time = distance / speed

The total distance Tim needs to cover is d.

Tim's speed in still water is vr.

The speed of the water is vw.

When Tim is swimming towards the person at the other end of the pool, he will be swimming against the current, so his effective speed will be vr - vw.

Using the formula, the time it takes Tim to cover the distance can be expressed as:

time = d / (vr - vw)

So the time taken by Tim can be expressed in terms of vr, vw, and d as:

time = d / (vr - vw)

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According to the principle of equivalence, all objects should fall at the same speed towards the Earth due to gravity.

However, when you drop a feather and a bowling ball from the same height, they fall at different rates due to the influence of air resistance.

Air resistance affects objects differently based on their size, shape, and surface area.

The feather has a larger surface area compared to its mass, which means it experiences more air resistance.

This resistance slows down the feather's fall, causing it to descend at a slower rate than the denser and more compact bowling ball.

In a vacuum where air resistance is eliminated, both objects would fall at the same rate, confirming the principle of equivalence.

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A ray of light passing through a converging lens would pass through option A, which is the focal point F.

A converging lens, also known as a convex lens, is thicker at the center and thinner at the edges. When a parallel beam of light passes through a converging lens, the lens bends the light rays and brings them to a focus at a point called the focal point (F). The focal point is located on the principal axis of the lens, which is a line passing through the center of curvature of the lens (C) and the center of the lens.

Therefore, when a ray of light passes through a converging lens, it is refracted and passes through the focal point F on the other side of the lens, provided the ray is incident on the lens at a point other than the center of the lens. The other options mentioned in the question, i.e., passing through the center of the lens, exiting parallel to the principal axis, or intersecting with the center of curvature, are possible scenarios but would require specific conditions of incidence, and are not general observations.

Therefore, the correct answer is option A.

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The number of ways in which 5 lottery balls can be selected from a pool of 35 balls is 324,632. The probability of winning such a lottery by matching all 5 numbers in no particular order is 0.0003%.

The number of ways in which 5 lottery balls can be selected from a pool of 35 balls is calculated by the combination formula:

35 choose 5 = (35!)/(5!*(35-5)!) = 324,632

This means there are 324,632 different combinations of 5 balls that could be selected from the pool of 35.

To calculate the probability of winning the lottery by matching all 5 numbers in no particular order, we need to know the total number of possible outcomes. This is simply the number of ways in which 5 balls can be selected from 35, which we just calculated.

The probability of winning the lottery by matching all 5 numbers in no particular order is therefore:
1/324,632 ≈ 0.0003%

This is a very small probability, which is why winning the lottery is considered a rare occurrence.

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The kinetic energy of an object is determined by its mass and velocity. Since all three children have the same mass and initially run at the same speed, their kinetic energies are equal at the beginning of the race. However, as the race progresses, child 1 runs faster over the final 10 meters and finishes first.

At the moment child 1 crosses the finish line, her kinetic energy is greater than the other two children's because she has a higher velocity. Kinetic energy is calculated using the formula KE = 0.5 * m * v^2, where KE is kinetic energy, m is mass, and v is velocity.

Since child 1 has a higher velocity (speed) at the end of the race, her kinetic energy is greater than the other two children, even though they all have the same mass. This increased kinetic energy enables child 1 to cover the final distance more quickly, resulting in her winning the race.

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The speed of waves in a wire is determined by the properties of the wire and the tension applied to it. The tension remains constant, the speed of the waves in a wire is proportional to the square root of the tension divided by the linear density of the wire.

If we replace the wire with an identical one that is twice as long, the linear density of the wire will be half as much as before. This means that the speed of the waves in the wire will increase by a factor of the square root of two. In other words, the new speed of the waves will be approximately 1.414 times the original speed.

It's important to note that this assumes that all other properties of the wire remain constant. If the tension applied to the wire changes, or if the new wire is made of a different material, then the speed of the waves could be different than what we would expect based solely on the length of the wire.

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A brownout is a momentary decrease in voltage, also known as a sag. It is a drop in voltage in the power supply system that causes the voltage to fall below the standard voltage level, which can lead to equipment malfunction, data loss, and other problems.

The causes of brownouts can vary from overloaded electrical circuits, grid instability, lightning strikes, or even simple weather conditions. The effects of brownouts can be severe and damaging, particularly for sensitive electronic equipment like computers, medical devices, and industrial equipment, which require a stable power supply.

One way to prevent the negative effects of brownouts is by using uninterruptible power supplies (UPS) to maintain a steady voltage during a brownout. UPS systems consist of a battery backup that kicks in immediately when the main power source is lost or reduced, ensuring that equipment remains powered and protected during a brownout. Another way is to install voltage regulators or surge protectors that can maintain a stable voltage and protect equipment from sudden surges or dips in power. In conclusion, it is essential to be prepared for brownouts and have proper protection and backup measures in place to minimize the potential damage caused by them.

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The wavelength of the standing wave is: wavelength = 327 cm / 4 = 87 cm, the fundamental frequency of the string is 286 Hz.  

(a) To determine the wavelength of the standing wave in the 327 cm-long string, we can use the formula:

wavelength = speed of wave / frequency

The speed of the wave in the string can be found by dividing the length of the string by the number of nodes in the wave, which is four in this case. Therefore, the wavelength of the standing wave is:

wavelength = 327 cm / 4 = 87 cm

(b) To find the fundamental frequency of the string, we need to determine the frequency at which the first node of the standing wave occurs. The number of nodes in the wave is equal to the number of half wavelengths in the string.

We know that the wavelength of the standing wave is 87 cm, so we can calculate the number of half wavelengths by dividing the wavelength by 2:

number of half wavelengths = 1 / 2 x wavelength = 1 / 2 x 87 cm = 43.5 cm

The number of half wavelengths is equal to the number of nodes in the wave, so the fundamental frequency of the string is:

fundamental frequency = 1 / number of half wavelengths = 1 / 43.5 cm = 0.0226 Hz

Therefore, the fundamental frequency of the string is 286 Hz.  

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"House of Ashes" is a video game that follows a group of soldiers who are trapped underground and must fight for survival against supernatural creatures.

Nick is one of the characters in the game, and keeping him alive can be challenging. Here are some tips to help you keep Nick alive in "House of Ashes":

Pay attention to Quick Time Events (QTEs): During certain action sequences in the game, you will need to react quickly to avoid danger.

Keep an eye out for QTE prompts on the screen and respond quickly to keep Nick and the other characters alive.

Choose dialogue options carefully: The choices you make during dialogue scenes can impact how the story unfolds.

Choose dialogue options that align with Nick's personality and try to avoid antagonizing other characters.

Use cover to avoid enemy attacks: When you encounter enemies, use cover to avoid their attacks. Stay behind objects like pillars or walls and peek out to take shots at the enemy.

This can help you avoid taking damage and keep Nick alive.

Work with the other characters: "House of Ashes" is a cooperative game, and you will need to work with the other characters to survive. Pay attention to their needs and help them when necessary.

This can help build trust and improve your chances of keeping Nick alive.

Be cautious when exploring: When you are exploring the underground tunnels, be cautious and watch out for traps and other dangers.

Move slowly and carefully to avoid setting off traps or attracting the attention of enemies.

By following these tips, you can improve your chances of keeping Nick alive in "House of Ashes".

However, keep in mind that the game has multiple possible endings, and your choices will impact the outcome of the story.

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The terminal velocity of the new ball will be four times the terminal velocity of the original ball.

The terminal velocity of the new ball. Terminal velocity is the maximum velocity a falling object can reach when the drag force equals the gravitational force pulling it downward. The key factors influencing the terminal velocity are the object's mass, surface area, and the properties of the fluid it's falling through.

The diameter of the ball while keeping the material and structure unchanged, the volume of the ball would increase as the diameter is doubled, and the mass would increase proportionally to the volume. However, the surface area of the ball increases as the square of the diameter.

The formula to estimate the terminal velocity:

v = √(2mg / (ρAC))

Where:

v is the terminal velocity,

m is the mass of the ball,

g is the acceleration due to gravity (approximately 9.8 m/s^2),

ρ is the density of the fluid (air, in this case),

A is the cross-sectional area of the ball, and

C is the drag coefficient.

Since the mass of the ball increases proportionally to the volume (and thus to the cube of the diameter),

m2 = 2²3 ×m1 = 8m1

The cross-sectional area of the ball will increase proportionally to the square of the diameter:

A2 = 2²2 × A1 = 4A1

Therefore, substituting these values into the terminal velocity equation:

v2 = √(2 × (8m1) × (9.8) / (ρ ×4A1 × C))

Simplifying:

v2 = √(16 × m1 ×g / (ρ × A1 × C))

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Use the principles of vector addition to find the magnitude and direction of the third force if we know the magnitudes and directions of the other forces.

To answer your question, we need to know the two other forces acting on the object. Without that information, it's impossible to give an exact magnitude and direction of the third force. However, we can discuss some general concepts.

Magnitude refers to the size or strength of a force. It's typically measured in units such as newtons or pounds. Direction refers to the path that the force is acting in, such as up, down, left, or right.

If we assume that the object is moving to the west at a constant speed, we can infer that the net force acting on it is zero. This means that the sum of all forces acting on the object is equal and opposite. If we know the magnitude and direction of two of those forces, we can use vector addition to determine the magnitude and direction of the third force.

For example, if we know that there are two forces acting on the object: a force of 10 newtons to the east and a force of 5 newtons to the north, we can draw a diagram to represent these forces as vectors. We can then use vector addition to find the resultant vector, which represents the sum of these two forces. If the object is moving to the west at a constant speed, we know that the resultant force must be directed to the west with a magnitude equal to 15 newtons (the sum of the magnitudes of the two known forces).

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A) Using Ohm's Law, we can find the voltage drop across the resistor: V = IR = (3.00 A)(17.0 Ω) = 51.0 V. The emf of the battery is then the sum of the voltage drop across the resistor and the voltage drop across the capacitor at t = 0: E = V + q/C = 51.0 V + 0 = 51.0 V.

B) To find the time when the charge on the capacitor is equal to 40.0 × 10−6 C, we can use the equation q = CE(1 - e^(-t/RC)). Solving for t, we get t = -RC ln(1 - q/CE) = (-17.0 Ω)(9.00 × 10^-6 F) ln(1 - 40.0 × 10^-6 C/(9.00 × 10^-6 F)(51.0 V)) ≈ 4.07 ms.

C) The rate at which energy is being stored in the capacitor is given by dU/dt = 1/2 C (dV/dt)^2. At t = 0, dV/dt = E/(RC) = (51.0 V)/(17.0 Ω)(9.00 × 10^-6 F) ≈ 3.00 × 10^3 V/s. Plugging in the values, we get dU/dt = 1/2 (9.00 × 10^-6 F) (3.00 × 10^3 V/s)^2 ≈ 40.5 mW.

D) The rate at which energy is being supplied by the battery is given by dU/dt = IV, where I is the current and V is the emf of the battery. At t = 0, we have I = 3.00 A and V = 51.0 V, so dU/dt = (3.00 A)(51.0 V) = 153 W.

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The four methods that can be used to predict the movement of a surface mid-latitude cyclone are

1. Model Analysis

2. Satellite Images

3. Weather Radar

4. Surface Observations

The four methods that can be used to predict the movement of a surface mid-latitude cyclone are listed below:

1. Model Analysis:

Model analysis is used to forecast the path of the surface mid-latitude cyclone. It is an essential tool for tracking cyclones.

2. Satellite Images:

Satellite images provide a view of the storm's location and movement. This helps to forecast the cyclone's path.

3. Weather Radar:

Weather radar shows the wind speed and direction. This helps to track the cyclone's path.

4. Surface Observations:

Surface observations help to track a surface mid-latitude cyclone. They provide information about pressure, temperature, and wind speed.

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If you rapidly stir some raw eggs with an eggbeater, the temperature of the eggs will remain unchanged.

Humans and human ancestors have scavenged and eaten animal eggs for millions of years.

Humans in Southeast Asia had domesticated chickens and harvested their eggs for food by 1500 BCE.

The most widely consumed eggs are those of fowl, especially chickens. Eggs of other birds, including ostriches and other ratites, are eaten regularly but much less commonly than those of chickens.

People may also eat the eggs of reptiles, amphibians, and fish. Fish eggs consumed as food are known as roe or caviar.

The act of stirring will not generate any heat or cooling effect, and the temperature of the raw eggs will remain the same.

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Most of the elements with nuclei heavier than those of hydrogen and helium are formed through nuclear fusion in stars.

This process occurs when the extreme temperatures and pressures at the core of a star cause the nuclei of lighter elements to combine and form heavier elements. For example, the fusion of hydrogen nuclei produces helium, and the fusion of helium nuclei produces carbon, nitrogen, and oxygen.

The fusion of heavier elements requires even higher temperatures and pressures, which are only found in the cores of more massive stars. This process continues until the heaviest elements are formed, such as gold and uranium.

While nuclear fission in supernovas can also contribute to the formation of heavy elements, it is the process of nuclear fusion in stars that is primarily responsible for the creation of most of the elements in the universe.

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The potential difference across the resistor is 80 volts.

The potential difference, also known as voltage, is the difference in electric potential energy per unit of charge between two points in an electrical circuit. It is measured in volts (V) and represents the amount of work needed to move a unit of charge between the two points.

We can use Ohm's law to calculate the potential difference (voltage) across the resistor. Ohm's law states that the voltage (V) across a resistor is equal to the current (I) through the resistor multiplied by its resistance (R):

V = I * R

In this case, the current through the resistor is 8 A and its resistance is 10.0 ohms. Substituting these values into the equation, we get:

V = 8 A * 10.0 ohms

V = 80 V

Therefore, the potential difference across the resistor is 80 volts.

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The speed of the train after 5.90 seconds on the incline is 13.74 m/s.

Since the train is slowing down with a constant acceleration while going up the incline, we will use the equation:

Final speed = Initial speed - (Acceleration × Time)

In this case:
Initial speed = 22.0 m/s (constant speed before the incline)
Acceleration = 1.40 m/s² (magnitude of constant acceleration)
Time = 5.90 s (time spent on the incline)

Now, we can plug the values into the equation:

Final speed = 22.0 m/s - (1.40 m/s² × 5.90 s)

Final speed = 22.0 m/s - (8.26 m/s)

Final speed = 13.74 m/s

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The general manager target bonus plan includes financial incentives based on achieving specific performance goals.

The general manager target bonus plan is a type of incentive program that rewards managers for achieving specific performance goals. The plan typically includes financial incentives, such as bonuses or profit sharing, that are tied to the achievement of predetermined goals, such as revenue growth, cost reduction, or customer satisfaction.

The plan may also include other performance metrics, such as employee engagement or operational efficiency. By linking financial incentives to specific performance goals, the plan encourages managers to focus their efforts on areas that are critical to the success of the organization and helps align their interests with those of the company. Overall, the general manager target bonus plan is a key tool for motivating and rewarding managers and driving performance improvement within an organization.

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The 900 MHz frequency would produce smaller hot spots in foods due to interference effects because it has a smaller wavelength compared to 2560 MHz frequency.

Interference effects in microwaves occur when waves overlap, creating constructive and destructive interference patterns. These patterns result in hot and cold spots within the food being cooked. The spatial extent of interference effects between waves generally increases with increasing wavelength. Since frequency and wavelength are inversely proportional, a higher frequency corresponds to a smaller wavelength.

Therefore, the 900 MHz frequency has a smaller wavelength than the 2560 MHz frequency. This smaller wavelength leads to smaller interference patterns and, consequently, smaller hot spots in foods cooked in a microwave oven operating at 900 MHz compared to one operating at 2560 MHz.

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a) If the RPM rate is doubled, the angular velocity of the turntable will also double, since angular velocity is directly proportional to RPM. This means that the ladybug's linear speed will also double, since it is directly proportional to the angular velocity and the distance of the ladybug from the axis.

b) If the ladybug sits at the edge of the turntable, its distance from the axis will be greater than if it were sitting halfway between the axis and the edge. This means that the ladybug's linear speed will be greater at the edge of the turntable than halfway between the axis and the edge, since linear speed is directly proportional to the distance from the axis and the angular velocity.

c) If both a and b occur, the ladybug's linear speed will increase by a factor of four, since the RPM rate is doubled and the ladybug is now at the edge of the turntable. This means that the ladybug will be moving much faster than before and will need to be careful not to fall off the turntable.

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To answer this question, we need to first understand what is meant by "the polar basis associated with its current position." In polar coordinates, a point is described by its distance from the origin (the radial coordinate) and its angle from the positive x-axis (the angular coordinate). The polar basis associated with a point is the set of unit vectors pointing in the radial and angular directions.

Now, let's return to the particle. We know that it starts at some initial time with some initial position and velocity described in polar coordinates. As time progresses, the particle's position will change according to its velocity. To find the position of the particle at a particular time, we need to integrate its velocity over the time interval between the initial time and the desired time.

However, there is a complication here because the velocity is described in the polar basis associated with the particle's current position, not the initial position. This means that as the particle moves, the basis vectors themselves will also change. To account for this, we need to use the chain rule of differentiation when we integrate the velocity. Specifically, we need to multiply each component of the velocity by the derivative of the corresponding basis vector with respect to time.

In general, this problem is quite complex and requires a lot of mathematical machinery to solve. The final position of the particle will depend on its initial position, velocity, and the details of how the basis vectors change as it moves.

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When N identical springs determine are connected in series, the effective spring constant can be expressed as the reciprocal of the sum of the reciprocals of the individual spring constants.

In other words, if the individual spring constants are represented as k1, k2, k3, …, and kN, then the effective spring constant (k) can be calculated using the following formula:

k = 1 / (1/k1 + 1/k2 + 1/k3 + … + 1/kN)
This expression takes into account the fact that when springs determine are connected in series, the displacement or compression of one spring affects the entire system, leading to a combined stiffness that is less than that of a single spring. By adding up the reciprocals of the individual spring constants and then taking the reciprocal of the sum, we arrive at the effective spring constant for the series system. Understanding this expression is important for designing and analyzing systems that use multiple springs in series, such as suspension systems in vehicles, or the suspension of bridges or buildings. By knowing the effective spring constant, we can calculate the natural frequency of vibration, the amount of displacement under a given load, and other important parameters that affect the performance of the system.

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The basic function of a transformer is to convert one level of electrical voltage or current to another level. Therefore, the correct answer is C, low voltage to high or vice versa.

Transformers are used extensively in electrical power systems to step up the voltage for transmission and step down the voltage for distribution. They operate on the principle of electromagnetic induction and have no moving parts, making them highly efficient and reliable. Transformers can be found in many applications such as power supplies, audio systems, and medical equipment. They play a critical role in modern technology by allowing the efficient transmission and distribution of electricity.
The basic function of a transformer is involved in the conversion process C: low voltage to high voltage or vice versa. Transformers are crucial in power transmission and distribution systems, as they are used to step up or step down voltage levels according to the requirements, allowing efficient transfer of electrical energy. It's important to note that transformers only work with alternating current (AC) and do not convert mechanical energy to electrical, electrical energy to mechanical, or alternating current to direct current.

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After considering all the given data we come to the conclusion that the top velocity at which the individual must run is 66 m/s.

In order to catch the ball before it hits the ground, the second player must run at a speed equal to the horizontal component of the ball's velocity. The horizontal component of the ball's velocity is given by:

v₀x = v₀ cos(θ)

Here,

v₀ = initial speed of the ball,

θ = angle of projection with respect to the horizontal v₀x = horizontal component of the ball's velocity.

For the given case, v₀ = 16 m/s and θ = 37°. Then,

v₀x = 16 cos(37°) ≈ 12.7 m/s

The second player is at a distance of 33 m from the first player. The time taken by the ball to reach this point can be evaluated as follows:

t = d / v₀x

Here,

d = distance between the two players

t = time taken by the ball to reach this point.

Staging d = 33 m and v₀x = 12.7 m/s, we get:

t ≈ 2.6 s

The vertical component of the ball's velocity can be evaluated as follows:

v₀y = v₀ sin(θ)

Here,

v₀y = vertical component of the ball's velocity.

The time taken by the ball to hit the ground can be evaluated as follows:

t' = 2v₀y / g

Here, g is acceleration due to gravity.

Staging  v₀y = v₀ sin(θ) and g = 9.8 m/s², we get:

t' ≈ 2.1 s

Then, for the second player to catch the ball before it hits the ground, he must run at a speed equivalent to:

v = d / (t - t')

Here,

d = distance between the two players,

t = time taken by the ball to reach this point

t' = time taken by the ball to hit the ground.

Staging d = 33 m, t ≈ 2.6 s and t' ≈ 2.1 s, we get:

v ≈ 33 / (2.6 - 2.1) ≈ 66 m/s

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