5. Vo=100 m/s h=? A=37° 640 m At what height does the projectile hit the wall?

Galileo Galilei made the first detailed observations of the largest planet in our solar system.

Galileo Galilei made the first detailed observations of Jupiter in solar system. Galileo is renowned for his discoveries. He was the first to report telescopic observations of mountains on the moon, moons of Jupiter,  phases of Venus, and rings of Saturn. He also invented an early microscope and a predecessor to the thermometer.

Galileo's discoveries about the Moon, Jupiter's moons, Venus, and sunspots supported the idea that the Sun was the center of the Universe.  Work of Galileo also laid the foundation for today's modern space probes and telescopes.

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Answer:

I believe the answer is D: Conductor.

The minimum separation distance required is 1 inch, or a continuous and firmly fixed nonconductor may be used in addition to the insulation of the conductor.

According to the National Electrical Code (NEC) Article 300.2, open conductors are defined as conductors that are not covered by any insulation or are only covered by a thin covering of insulation. These conductors must be kept at a safe distance from other conductors or conducting materials to prevent electrical arcing or short circuits.

NEC Section 394.15 provides the minimum separation requirements for open conductors. It states that open conductors must be separated from metal raceways, piping, or other conducting material, as well as any exposed lighting, power, or signaling conductors. The minimum separation distance is 1 inch, unless the conductors are separated by a continuous and firmly fixed nonconductor in addition to the insulation of the conductor.

This means that if the open conductor is separated from the other conductors or materials by a continuous and firmly fixed nonconductor in addition to the insulation of the conductor, the minimum separation distance of 1 inch may not be required.

In summary, open conductors must be separated from other conductors or conducting materials to avoid electrical arcing or short circuits. The minimum separation distance required is 1 inch, or a continuous and firmly fixed nonconductor may be used in addition to the insulation of the conductor.

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The three product which can be potentially fail considering Load Strength graph and precautionary measure to prevent failure are as below;

Ball Pen:

1. Ink Leakage: One potential failure of a ball pen is ink leakage. This can occur due to poor sealing between the ink reservoir and the ballpoint mechanism. Ink leakage can result in messy hands, stained documents, and reduced functionality of the pen. To prevent this failure, manufacturers can improve the quality control process to ensure proper sealing and use high-quality materials for the pen's components.

2. Ballpoint Jamming: Another failure is ballpoint jamming, where the ball gets stuck and prevents smooth writing. This can be caused by a buildup of dried ink or debris inside the pen's mechanism. To prevent ballpoint jamming, regular cleaning and maintenance of the pen can be recommended. Additionally, manufacturers can design the pen with features that facilitate easy cleaning or provide instructions on how to clear any blockages.

3. Weak Barrel Construction: The barrel of the pen may also be prone to failure if it is weak or brittle. Excessive pressure or rough handling can lead to cracks or breakage, rendering the pen unusable. To prevent this, manufacturers can use durable materials for the pen barrel, such as sturdy plastics or reinforced metal, and perform quality checks to ensure structural integrity.

Room Key:

1. Keycard Malfunction: A potential failure of a room key is a malfunction in its electronic components. This can result in the keycard being unreadable by the door lock system, preventing access to the room. To prevent this failure, regular maintenance and replacement of keycard readers can be implemented. Additionally, guests should be advised to keep their keycards away from magnets and electronic devices that can interfere with the card's functionality.

2. Magnetic Strip Damage: Another failure can occur if the magnetic strip on the keycard gets damaged or demagnetized. This can happen due to exposure to magnetic fields or physical damage. To prevent this failure, keycards can be made more durable with protective coatings or alternative technologies such as RFID. Guests should also be educated on proper handling and storage of keycards to avoid damage.

3. Battery Drain: Some room keys use batteries to power their electronic components. A failure can occur if the battery drains, leading to an inactive keycard. To prevent this, low-power consumption designs can be implemented, and regular battery checks or replacements can be carried out by hotel staff. Guests should be informed about the importance of returning the keycard to the front desk for recycling or proper disposal to ensure the battery is replaced as needed.

Blender:

1. Motor Burnout: One potential failure of a blender is motor burnout due to prolonged use or overloading. Continuous operation at high speeds or attempting to blend hard or frozen ingredients beyond the blender's capacity can cause the motor to overheat and fail. To prevent motor burnout, manufacturers can provide clear guidelines on the maximum load capacity and recommended usage durations. Automatic thermal protection mechanisms can also be incorporated to shut off the blender if it detects excessive heat.

2. Blade Jamming: Another failure can occur if food particles or ingredients get jammed between the blender's blades, preventing them from spinning freely. This can happen if the blender is not properly cleaned or if ingredients are not adequately prepared before blending. To prevent blade jamming, users should be advised to clean the blender thoroughly after each use and ensure that ingredients are cut into manageable sizes. Manufacturers can also design blades with accessible mechanisms for easy cleaning or provide cleaning tools.

3. Leakage: A failure in a blender can also manifest as leakage. This can happen if the blender jar or its sealing components are damaged or improperly assembled. Liquid or food can leak out during blending, resulting in a messy and potentially unsafe situation. To prevent leakage, manufacturers should ensure proper sealing mechanisms and use high-quality materials for the blender jar and lid. Regular inspection of the sealing components can be advised,

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Answer:

NO

Explanation:

I=mr^2 this means moment inertia depends upon mass and square of radius or distance.

The type of axle that is also a part of the drivetrain system is called a "drive axle" or "driven axle".

A drive axle is a component of a vehicle's drivetrain that is responsible for transferring power from the engine and transmission to the wheels. In a rear-wheel drive vehicle, the drive axle is located in the rear of the vehicle and transmits power to the rear wheels. In a front-wheel drive vehicle, the drive axle is located in the front of the vehicle and transmits power to the front wheels. In some vehicles, such as all-wheel drive or four-wheel drive vehicles, multiple drive axles may be used to transfer power to all four wheels.

The drivetrain of car is actually a collection of drivetrain components that work together with the engine to move the wheels and other sections of the car to propel it forward. The transmission, differential, driveshaft, axles, CV joints, and wheels are typically included in this group.

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Answer:

a) The graph labeled 'Disk A' correctly models the velocity of disk A as a function of position as it is being pushed by the force. This is because the shape of the graph follows the general pattern of an object accelerating non-uniformly: the slope of the graph increases for the first part up until the middle, at which point it levels off and the velocity eventually reaches a maximum.

b) Neither disk reaches a greater maximum height than the other. Both disks reach the same maximum height when they reach the top of the curved section of the track.

c) When both disks are pushed by the same force over the same distance across the horizontal portion of the track, the same amount of kinetic energy is imparted to each disk. This means that each disk will have the same amount of kinetic energy at the bottom of the curved section of the track, and thus both disks will travel with the same velocity when they reach the top of the curved section of the track. Since kinetic energy is conserved, this implies that both disks will reach the same maximum height when they reach the top of the curved section of the track.

d) In the case where friction is not negligible, the coefficient of kinetic friction between each disk and the track is the same. Since friction introduces an additional force to the system, the disk with the greater coefficient of kinetic friction will lose more kinetic energy as it slides up the ramp. Consequently, this disk will reach a lower maximum height than the disk with the smaller coefficient of kinetic friction.

Her jumper would appear dark and drab, practically a dark shade of gray, if Ray shone a green filter on it.

This is so because the wavelengths of light that an object reflects define its color. In the case of red clothing, it reflects red light with wavelengths between 620 and 750 nm. The green filter, however, blocks all other wavelengths, including red ones, and only allows green light wavelengths (between 495 and 570 nm) to get through when it is positioned in front of the red jumper.

We wouldn't see the colour red because red wavelengths are blocked and red clothing can't reflect them back to our eyes. Instead, we would observe the dark and dreary greyish-green color that is produced when residual green wavelengths combine with the color of the red garment.

The interaction between green filter's color wavelengths and red jumper's color wavelengths causes red jumper to appear as a dark and dreary greyish-green color when green filter is shone upon it.

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Answer:

The reason you feel weightless is because there is no force pushing against you, since you are not in contact with anything. Gravity is pulling equally on all the particles in your body. This creates a sensation where no forces are acting on you and you feel weightless.

Answer:

2.30×10³

10.3

Explanation:

The rules for significant digits are:

To write 2300.2 in three significant figures, you'll have to write it in scientific notation.

2.30×10³

To write 10.26730 in three significant figures, simply round to the tenths place.

10.3

A concave mirror is a type of optical surface that has a reflective surface that curves inward. This type of mirror is often used in optical devices, such as telescopes and magnifying glasses.

The design of these devices involves only one optical surface, the concave mirror, which is used to focus light onto a specific point or image. The curvature of the mirror determines how the light is reflected and focused, and the distance between the mirror and the object being viewed affects the magnification and clarity of the image. The simplicity of the design involving only one optical surface makes it easier to produce and maintain optical devices, and it also allows for greater precision and accuracy in the resulting images. Overall, the use of a concave mirror as the sole optical surface in a design offers a cost-effective and efficient solution for a variety of optical applications.

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By solving this equation, we can find the value of Xl, which represents the inductive reactance. Thus, we can determine the value of the inductance in the circuit. In an RLC series circuit, the phase angle can be determined using the formula:

In an RLC series circuit, the phase angle can be determined using the formula:
tan(phase angle) = (Xc - Xl) / R
Where Xc is the capacitive reactance, Xl is the inductive reactance, and R is the resistance.
In this case, we are given that the capacitive reactance is 40 Ω, the resistor is 100 Ω, and the phase angle is 40.0°. We need to find the value of the inductance.
First, we need to convert the phase angle from degrees to radians. Since there are 2π radians in a full circle, we can use the following conversion:
phase angle (in radians) = (40.0° / 360°) * 2π
Next, we can rearrange the formula to solve for Xl:
Xl = (Xc - tan(phase angle) * R)
Substituting the given values:
Xl = (40 Ω - tan((40.0° / 360°) * 2π) * 100 Ω)
By solving this equation, we can find the value of Xl, which represents the inductive reactance. Thus, we can determine the value of the inductance in the circuit.
Please note that without specific information regarding the frequency, it is not possible to determine the exact value of the inductance. If you have the frequency value, please provide it so that we can proceed with the calculation.

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

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

Energy = Power × Time

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

Time = Energy ÷ Power

Converting the energy to watt-hours (Wh):

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

Converting the power to watt-hours (Wh):

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

Now we can calculate the time:

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

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

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

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

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

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

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

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

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

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

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

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

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As per the given values, and uncertainty of the speedometer the actual speed could be 61.33 km/h.

Uncertainty = 2.0 km/h

Measured value = 90 km/h

Calculating the Percent uncertainty -

= (Uncertainty / Measured value) x 100

= (2.0 / 90 ) x 100

= 2.22%

Now, assuming the speedometer has the same percent uncertainty at 60 km/h, this percent uncertainty can be used to determine the range of speeds.

Percent uncertainty = 2.22%

Measured value = 60 km/h

Calculating the range -

= (Percent uncertainty / 100) x Measured value

= (2.22% / 100) x 60

= 1.33

Calculating the Total speed -

= 60 + 1.33

= 61.33

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Complete Question:

If your speedometer has an uncertainty of 2.0 km/h at a speed of 90 km/h ,what is the percent uncertainty? (b) If it has the same percent uncertainty when it reads 60 km/h , what is the range of speeds you could be going?

Answer:

the laws of motion is what keeps everything going an back without gravity they couldn't been no us . let them say what they was but newton knows best if they want to come an say newtons discovery changed the world without him we couldn't rest

Answer:

A. like poles repel or push apart

Answer:

Animal Cells

Explanation:

they dont have cell walls because they dont need them. Wall cells are found in plants, which animals dont need.

Answer:

predominantly

Explanation:

they don't have cell walls

The mass moment of inertia about the y-axis (Iyy) for the solid of revolution with mass m can be determined using direct integration, resulting in Iyy = (7/22)mb².

To calculate Iyy using direct integration, follow these steps:
1. Identify the function y=f(x) representing the curve to be revolved around the y-axis.
2. Calculate the area element dA in terms of x: dA = 2πxρdx, where ρ is the mass per unit area (m/A).
3. Determine the mass element dm: dm = ρdA = 2πxρdx.
4. Obtain the moment of inertia element dIyy: dIyy = x²dm = 2πx³ρdx.
5. Integrate dIyy from x=a to x=b: Iyy = ∫(2πx³ρdx) from a to b.
6. Substitute the mass per unit area (ρ=m/A) into the integral and solve for Iyy.
7. Finally, after evaluating the integral, the mass moment of inertia will be given by Iyy = (7/22)mb².

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The frequency of the photons must be larger than a certain minimum value in order to eject electrons from the metal" is TRUE because it is known as the threshold frequency and is a characteristic of the metal.

When light of a certain frequency, or color, is shone on a metal, the energy from the photons is transferred to the electrons within the metal. If the frequency is too low, the energy is not sufficient to overcome the binding energy holding the electrons in place.

However, if the frequency is above the threshold frequency, the energy transferred to the electrons is enough to overcome the binding energy and the electrons are ejected from the metal.

This phenomenon is known as the photoelectric effect and is a fundamental principle in modern physics.

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If a current of 2.00 A in one is switched off in 1.30 ms, inducing a 8.00 V emf in the other, the mutual inductance between the two coils is 0.0052 henries (H).

Using Faraday's law of induction, we can determine the mutual inductance (M) between the two coils. The formula for induced emf (ε) is:

ε = -M * (ΔI/Δt)

where ε is the induced emf, M is the mutual inductance, ΔI is the change in current, and Δt is the time taken for the change.

We have the values:
ε = 8.00 V
ΔI = 2.00 A (since the current is switched off)
Δt = 1.30 ms = 0.0013 s

Now, we can rearrange the formula to solve for M:

M = -ε * (Δt/ΔI)

Plugging in the values:

M = -8.00 V * (0.0013 s / 2.00 A)

M = 0.0052 H

The mutual inductance between the two coils is 0.0052 Henries (H).

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Answer:

True

Explanation:

It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. Any change in motion involves an acceleration, and then Newton's Second Law applies.

- Hyperphysics

Answer:

true

Explanation:

because that's the answer

We know the power of the laser beam, so we know the energy per second that it delivers. The wavelength of the light tells us the energy of every photon, so we can use that to calculate the number of photons delivered per second

The energy of each photon is E = hf= hc/A (1.99 x 1025 J.m)/X.

The power is the total energy per second and the total energy Et is the number of photons N

times the energy E of each photon. A = 10.6 x 10 m, so E = (1.99 x 1025 J.m)/(10.6 x 10 m) = 1.88 x 1020 J

N/t=P/E = (0.100 x 103 W)/(1.88 x 10-20 J) = 5.32 x 1021 photons/s

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Answer:

203 beats per minute

Explanation:

Answer:

203 beats per minute

Explanation:

220-17= 203

Hope this helps :)

Charlotte is driving at a speed of \($63.4 {mi} / {h}$\), and she took her eyes off the road for \($3.31 {~s}$.\) We need to calculate how far she has traveled in feet during this time. Charlotte traveled 308 feet during this time.

To calculate the distance traveled by Charlotte in feet, we can use the formula;\($$distance=velocity×time$$\) First, we will convert the speed from miles per hour to feet per second. We know that;1 mile = 5280 feetand 1 hour = 60 minutes and 1 minute = 60 secondsSo,1 mile = 5280 feet and 1 hour = 60 minutes × 60 seconds = 3600 seconds

Therefore, 1 mile per hour = 5280 feet / 3600 seconds = $1.47 {ft} / {s}$Now, the velocity of the car is;$63.4 {mi} / {h} = 63.4 × 1.47 {ft} / {s} = 93.198 {ft} / {s}Next, we need to calculate the distance covered by the car during the time Charlotte looked at her phone for $3.31 {~s}. Therefore; distance = 93.198 {ft} / {s} × 3.31 {~s} = 308.039 \approx 308 {ft}

Therefore, Charlotte traveled $308 feet during this time.

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Answer: At the top of a pendulum's swing, the ball is no longer moving (at that very specific point of time). All of its kinetic energy has been converted to potential energy (or more specifically in this instance, gravitational potential energy).

Explanation: hope this helps

As we adjust to low light, our cone becomes nonfunctional and it may take 20-30 min for rhodopsin to become regenerated sufficiently so that you can see well in low-light conditions.

The most prevalent protein in the retinal rod cells is rhodopsin, a G-protein coupled receptor. It consists of two components: an opsin molecule connected to an 11-cis-retinal chromophore, which serves as the main photoreceptor molecule of vision. When a photon of light excites 11-cis retinal, rhodopsin is linked to it. This isomerizes into an all-trans conformation.

Rhodopsin is crucial to our ability to see in low light because it enables the rods in our eyes to receive photons and detect light. As rhodopsin absorbs a photon, it separates into a retinal and an opsin molecule before slowly and at a constant rate recombining back into rhodopsin. But because this happens gradually, it takes some time for our eyes to get used to the dark. For humans, acclimating to the dark takes roughly 20 to 30 minutes.

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Answer:

Explanation:

I cant really see the equation

27. The energy , in electronvolts, of an emitted photon when an electron transition from n=3 to n = 2 is  -1.89 eV.

28. The energy of this emitted photon in joules is -3.0278 x 10⁻¹⁹ Joules.

29. The frequency of the emitted photon is 4.572 x 10¹⁴ Hz.

30. The color of light associated with this photon is Red.

It is the number of oscillations per second of the sinusoidal wave.

Given is the Great Nebula in the constellation Orion consists primarily of excited hydrogen gas.

The electrons in the atoms of excited hydrogen have been raised to higher energy levels. When these atoms release energy, a frequent electron transition is from the excited n = 3 energy level to the n = 2 energy level, which gives the nebula one of its characteristic colors.

27. The energy of transition between n = 3 to n = 2 is

E = R h e (1/n₁² - 1/n₂²)    

where R = Rydberg constant and h = Planck's constant.

Substitute the values, we get

E = 1.0974 x 10⁻⁷ x 6.626 x 10⁻³⁴ x 1.6 x 10⁻¹⁹ (1/3² - 1 /2²)

E = -1.89 eV

28. Energy in joules can be obtained by multiplying  1.6 x 10⁻¹⁹ . So we have

E =  -1.89 eV x   1.6 x 10⁻¹⁹ J/eV

E =  -3.0278 x 10⁻¹⁹ Joules

29. Wavelength associated with the photon emitted is

1/λ = R (1/n₂² - 1/n₁² )

Substitute the values, we get

1/ λ  = 1.524 x 10⁶ /m

The frequency is related to the wavelength as

f = c/λ   where c = speed of light

f = 3 x 10⁸ x  1.524 x 10⁶

f = 4.572 x 10¹⁴ Hz

30. The color of light associated with the photon of calculated frequency is Red.

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The value that represents the mass of block C that would keep crate D in equilibrium is 196.2 kg (Option D).

To determine of value that represents the mass of block C that would keep crate D in equilibrium, ee can begin by determining the tension in the ropes. Since the crate is held in a certain location by two blocks, the tension in the ropes should be equal. We can use this fact to calculate the tension in the ropes by assuming that they have the same magnitude.

In this case, let T be the tension in each rope segment. The forces acting on the system can be represented in the following free-body diagram:

For the x-direction: T sin 30° = T sin 60° + µg = 0

where µ is the coefficient of friction and g is the acceleration due to gravity. Since the pulleys are frictionless, µ = 0. Therefore, we can simplify the equation as follows:

T sin 30° = T sin 60°

Dividing both sides by T:

sin 30° = sin 60°/2

This gives us: T = (2/√3) mg where m is the total mass of the system and g is the acceleration due to gravity.

Substituting the given values, we obtain:

T = (2/√3) × 150 × 9.81 ≈ 1962 N

Next, we can use the law of the lever to calculate the mass of block C required to keep the crate in equilibrium. According to this law, the sum of the moments acting on the system must be zero. We can choose the point where the ring is attached to the rope as the pivot. This gives us the following equation:

(135 kg)(9.81 m/s²)(3 m) + (mC)(9.81 m/s²)(6 m) - (150 kg)(9.81 m/s²)(4.5 m) - (1962 N)(3 m) = 0

Simplifying: (135)(3) + (6mC) - (150)(4.5) - (1962)(3) = 0

Rearranging: 6mC = 150(4.5) + 1962 - 135(3)

6mC = 2127

mC ≈ 196.2 kg

Therefore, the value that represents the mass of block C required to keep crate D in equilibrium is approximately 196.2 kg. Thus, the correct option is D.

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