when do you need to blank a spectrophotometer (spec 20)? select all that apply.
a. Between each sample, even if the wavelength remains the same. b. After completing all data collection, c. After the wavelength is changed d. Before running a set of samples.

According to the given information temperature and velocity  of the following is a vector quantity

A vector quantity is one that just has magnitude, whereas a vector quantity has both orientation and magnitude. Given that it is direction-independent at a given position, heat is a scalar number.

Vectors include gravity and displacement. They possess both a value and a direction. The fact that gravity and displacement are pointing in the same direction in this instance allows us to derive a scalar energy from them (in this example, their direction are down and down, respectively).

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Answer:

They generate electricity by contact.

Explanation:

The observation presented by the question above shows an example of electricity generated by the contact, which can also be called triboelectrification. This type of electricity is created when two objects made of different materials come into contact with each other, and that contact is interrupted soon afterwards, as occurs when someone, wearing woolen socks, walks over the carpet.

For triboelectrification to occur, it is necessary that at least one of the objects involved is electrically charged. This object, when in contact with another object, will transfer electrons carrying the neutral object, until the two objects have the same electrical potential. When interrupting the contact between the objects, the two are left with equal loads of energy.

The one that  represents a car with positive acceleration is graph number III.

The term velocity has to do with the change of displacement with time. The acceleration is the change in velocity with time. We know that the slope of the velocity time graph is the acceleration. Uniform velocity occurs when the displacement increases in equal amounts in equal time intervals thereby leading to a straight line graph.

Hence a positive acceleration is only possible when the velocity is increasing in  equal amounts in equal time intervals

We can see from the graphs that the one that  represents a car with positive acceleration is graph number III.

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Answer:

300m

Explanation:

It is very simple.

200m+100m= 300m

Answer:

i think its B

Explanation:

i found the answer on another website hope its the right answer :)

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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Answer:

V=22.5cm

Explanation:

The pitch of the sound is perceived to be lower when an object is approaching you while making a sound.

Sound is a type of vibration capable of propagating in a suitable media (e.g., air or water).

The sound waves are called acoustic waves and they have a well-defined frequency and amplitude.

In conclusion, the pitch of the sound is perceived to be lower when an object is approaching you while making a sound.

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Answer:

As they absorb energy, they are broken.

Explanation

Solutes dissolve when they interact with water. This is because, the attraction of solute particles with each other weakens and become replaced by solute-solvent interaction. As the water surrounds the solute, the solute is now said to be hydrated.

Energy is required to break solute-solute bonds. This energy absorbed in breaking solute-solute bonds is compensated for by the energy liberated when solute particles are hydrated.

If energy required to break solute-solute interaction is less than the energy liberated when solute particles are hydrated, the substance will dissolve in water.

Hence, as a substance dissolve in water, energy is absorbed when solute-solute interactions are broken.

the wavelengths in the hydrogen spectrum of the first four members of the series where m=1, the first four members have the wavelength of \(1.464 * 10^7 m,\) \(1.231 * 10^7 m,\) \(1.164 * 10^7 m,\) and \(1.097 * 10^7 m.\)

The wavelengths of the spectral lines in the Lyman series of the hydrogen spectrum can be calculated using the Rydberg formula:

1/λ = \(R * (1/n1^2 - 1/n2^2)\)

Where λ is the wavelength of the spectral line, R is the Rydberg constant (approximately \(1.097 * 10^7 m^-^1)\), and n1 and n2 are positive integers representing the energy levels of the electron in the hydrogen atom.

For the Lyman series, we have m = 1, which means the electron transitions from higher energy levels (n2) to the first energy level (n1 = 1).

Let's calculate the wavelengths for the first four members of the Lyman series:

For n2 = 2:

1/λ = \(R * (1/1^2 - 1/2^2)\)

1/λ = \(R * (1 - 1/4)\)

1/λ = \(R * (3/4)\)

λ = \(4/3R\)

Substituting the value of the Rydberg constant:

λ = \((4/3) * (1.097 × 10^7 m^-^1)\)

λ ≈ \(1.464 * 10^7 m\)

For n2 = 3:

1/λ = \(R * (1/1^2 - 1/3^2)\)

1/λ = \(R * (1 - 1/9)\)

1/λ = \(R * (8/9)\)

λ = \(9/8R\)

Substituting the value of the Rydberg constant:

λ = \((9/8) * (1.097 * 10^7 m^-1)\)

λ ≈ \(1.231 * 10^7 m\)

For n2 = 4:

1/λ = \(R * (1/1^2 - 1/4^2)\)

1/λ = \(R * (1 - 1/16)\)

1/λ = \(R * (15/16)\)

λ = \(16/15R\)

Substituting the value of the Rydberg constant:

λ = \((16/15) * (1.097 * 10^7 m^-^1)\)

λ ≈ \(1.164 * 10^7 m\)

For n2 = 5:

1/λ = \(R * (1/1^2 - 1/5^2)\)

1/λ = \(R * (1 - 1/25)\)

1/λ = \(R * (24/25)\)

λ = \(25/24R\)

Substituting the value of the Rydberg constant:

λ = \((25/24) * (1.097 * 10^7 m^-^1)\)

λ ≈ \(1.097 * 10^7 m\)

Therefore, the wavelengths of the first four members of the Lyman series are approximately:

\(1.464 * 10^7 m,\)

\(1.231 * 10^7 m,\)

\(1.164 * 10^7 m,\)

and \(1.097 * 10^7 m.\)

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For the instant represented, the velocity of A is VA = 5.5j in./sec and the tangential acceleration of B is (aB)t = - 7.2i in./sec². The expression vector can be seen as ac = α × OC = (-7.2/R)i × (-Rj) = 7.2j

To find the vector expressions for angular velocity (ω) and angular acceleration (α) of the disk, we can use the following relationships:

Angular velocity (ω) = dθ/dt

Angular acceleration (α) = dω/dt

Given:

Velocity of point A (VA) = 5.5j in./sec

Tangential acceleration of point B (aB)t = -7.2i in./sec²

The velocity VA is perpendicular to the radius OA, which means it is tangential to the circular path. Therefore, the direction of ω is along the positive z-axis (out of the plane of the paper).

So, we have:

ω = ωk

Next, we can find the angular acceleration α using the formula:

α = (aB)t / R

The direction of α will depend on the direction of the tangential acceleration and the orientation of the coordinate system. Since aBt is in the negative x-direction, we have:

α = (-7.2i) / R = (-7.2/R)i

Finally, to find the acceleration ac at point C, we can use the relationship:

ac = α × OC

OC is in the negative x-direction, so the cross product will result in a vector pointing in the negative y-direction. Therefore, we have:

ac = α × OC = (-7.2/R)i × (-Rj) = 7.2j

In summary:

ω = ωk

α = (-7.2/R)i

ac = 7.2j

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Complete question:

The circular disk rotates about its center O. For the instant represented, the velocity of A is VA = 5.5j in./sec and the tangential acceleration of B is (aB)t = - 7.2i in./sec^2. Write the vector expressions for the angular velocity w and angular acceleration a of the disk. Use these results to write the vector expression for the acceleration ac of point C.

Given the production rules below, is the plus operator (+) left-associative, right-associative, or neither a parse tree of it is in the explanation part below.

In the provided production rules, the addition operator (+) is left-associative.

Consider the statement "1 + 2 + 3" to show this.

This sentence's parse tree is as follows:

The addition operator's left-associativity is shown in this parse tree. The operands 1 and 2 are combined by the leftmost plus operator, and the resultant total is merged with the operand 3 by another plus operator. This depicts the assessment of the statement "1 + 2 + 3" from left to right.

If the plus operator were right-associative, the parse tree would be different, with the rightmost plus operator first combining operands 2 and 3, and then combining the resultant sum with operand 1.

Thus, the parse tree is attached below as image.

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The book "Feedback Control of Dynamic Systems 8th Edition" was written by Gene F. Franklin, J. Da Powell and Abbas Emami-Naeini.

"Feedback Control of Dynamic Systems" is a textbook that provides an introduction to control theory, feedback control, and the analysis and design of control systems. The book covers a range of topics, including mathematical modeling, feedback control, time and frequency domain analysis, stability, and controller design.

It is commonly used as a textbook in undergraduate and graduate courses in electrical and mechanical engineering, as well as in other related fields. The eighth edition of the book, published in 2019, is written by Gene Franklin, J. Da Powell, and Abbas Emami-Naeini.

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The correct answer is option C. Chemical.

A chemical reaction is a process in which chemical bonds between atoms are broken and reformed, resulting in the creation of new substances with different properties from the original ones. During a chemical reaction, the atoms of the reactant molecules rearrange themselves to form new products, which can have different physical and chemical properties than the original substances.

Chemical reactions can be classified into different types based on the nature of the reactants and the products formed. For instance, a synthesis reaction is a type of chemical reaction in which two or more substances combine to form a more complex compound, while a decomposition reaction is a reaction in which a compound is broken down into simpler substances.

Chemical reactions are fundamental to many natural and industrial processes, from the production of fuels and materials to the metabolism of living organisms. Understanding the mechanisms and properties of chemical reactions is crucial for many fields of science, including chemistry, biochemistry, and materials science.

In conclusion, a chemical reaction is a process in which substances change to other substances as chemical bonds break and reform. It is a fundamental concept in chemistry and has important applications in many scientific and industrial fields.

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Answer:

it is C,D

Explanation:

test proved

The average amount of precipitation in Seattle during, March. So, option D.

The average and extreme temperatures and precipitation patterns over an extended period of time at a location define the climate there.

Here,

A local, regional, or global area may be mentioned in a climate description.

Changes in the earth's climate are referred to as climate change. A variety of internal and external variables contribute to this.

Over the past few decades, the climatic shift has gained global attention. The earth's life is also impacted by these climatic shifts in a number of ways.

The city of Seattle has a moderate climate, which the most widely used categorization system places in the Mediterranean zone, however some sources place it in the oceanic zone.

It has moderate, comparatively dry summers and cool, wet winters, encompassing features of both. Because it is milder and wetter than a true Mediterranean climate but still has a dry summer, the climate is frequently referred to as a modified Mediterranean climate.

Hence,

The average amount of precipitation in Seattle during, March. So, option D.

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Answer:

D

Explanation:

their octet is complete they don't react with any thing

Argon and krypton have similar properties, and they have a complete octet, which means that they do not react with anyone. Hence, option D is correct.

The phrase "inert gas" is a bit misleading because, in some circumstances, these gases can really be reactive. As a result, these gases are typically referred to as noble gases in the context of chemistry and materials science.

The term "noble" has historically been used in chemistry (and earlier in alchemy) to characterize the resistance of some metals to chemical reaction, and the term "noble gas" denotes the same resistance.

These are the inert gases which are mentioned in the periodic table.

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Answer:

The tension in the cable is approximately 1440.0 N

Explanation:

The length of the beam = 8 m

The weight of the beam = 200 N

The angle made by the beam support cable = 53°

The weight of the person = 600 N

The position where the person stands = 2 m

The forces acting are the weight of the cable acting at the center of the beam and the weight of the person acting at 2 m from the wall

Therefore, we have;

Sum of moments = 0, which gives;

2000 × 4 + 2 × 600 - 8 × \(T_y\) = 0

2000 × 4 + 2 × 600  = 8 × \(T_y\)

\(T_y\) = 9200/8 = 1150 N

The tension in the cable, T = The component of the force in the cable

The vertical component of the tension  \(T_y\) = T×sin(53)

Therefore;

T =  \(T_y\)/(sin(53)) = 1150/(sin(53 degrees)) = 1439.96 ≈ 1440 N

The tension in the cable, T is approximately 1440 N.

Answer:

a = 7.5 [m/s²]

Explanation:

To solve this type of problem we must remember Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.

∑F = m*a

where:

∑F = sum of forces [N]

m = mass = 0.1 [kg]

a = acceleration [m/s²]

Now replacing:

\(0.9-0.15=0.1*a\\a=7.5 [m/s^{2} ]\)

Answer:

0.1kg

Explanation:

mass = force / acceleration

0.5 / 5

0.1kg

Answer:

416 kj

Explanation:

hope it helps

Answer:

416 kj

Explanation:

For this particular problem, we are not dealing with a temperature change, rather, we are dealing with a scenario in which we are melting ice. Hence, we need to use the delta H fusion equation:

q=m⋅ΔHfus

Hope that I could help.

The displacement of a car that travels 20 km west and then 5 km east is 5 km west. Displacement is a measure of the change in position of an object, and it is calculated by taking the final position of the object and subtracting its initial position. In this case, the car starts at an initial position and travels 20 km west, so its final position is 20 km west of its starting point. Then, the car travels 5 km east, which brings it back to its starting point. Therefore, the displacement of the car is 5 km west, as it has moved 5 km west of its starting point during its journey.

Answer:

In the surface of the moon, gravitational acceleration is 1.63 m/s*2.

Explanation:

An object of mass M will accelerate gravitationally at a distance R if it is at the following distance:

g = G*M/R^2

Where the gravitational constant is G.

G = 6.67*10^(-11) m^3/(kg*s^2)

At the surface of a moon, the distance between its surface and its center will be equal to its radius, since a moon's mass is concentrated at its center, thus:

R = 1740 km

It's important to remember that we need meters in order to work:

1 km = 1000 m

so:

1740 km = (1740)*1000 m = 1740000 m

R =  1740000 m

Basically, the mass consists of:

M = 7.4x10^22 kg

Incorporating all that into the gravitational acceleration equation, we get:

g = (6.67*10^(-11) m^3 / (kg*s^2))*(7.4x10^22 kg) / ( 1740000 m)^2

g = 1.63 m / s^2

In the surface of the moon, gravitational acceleration is 1.63 m / s*2.

Following an inelastic collision, the kinetic energy can be converted into heat, potential energy and sound. Kinetic energy is motion energy.

Kinetic energy is motion energy, i.e., the energy contained by a particular object in movement.

This type of energy (kinetic energy) is produced by a given object during its acceleration.

Kinetic energy is transferred from a particular object to another during a collision (either an elastic collision or inelastic collision)

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The phenomenon in hearing that is analogous to spatial frequency channels in vision is critical bands. Hence, the correct option is A: Critical bands.

Critical bands are regions of the audible frequency range in which a complex sound is divided into individual, discrete frequency bands by the human auditory system.

For instance, when different frequencies in a complex sound, such as a musical instrument or a human voice, are picked up by the ear, they are sent to the brain via various channels that respond to specific frequencies.

These channels are referred to as critical bands. The frequency range of these bands varies depending on the loudness of the sound.

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During January month is the earth nearest to the sun

The perihelion (q) and aphelion (Q) are the nearest and farthest points respectively of a body's direct orbit around the Sun.

Comparing osculating elements at a specific epoch to effectively those at a different epoch will generate differences. The time-of-perihelion-passage as one of six osculating elements is not an exact prediction (other than for a generic two-body model) of the actual minimum distance to the Sun using the full dynamical model. Precise predictions of perihelion passage require numerical integration. perihelion occurs in early January, it occurs around January 3rd. and covers about 91 million miles (146 million kilometers), just shy of 1 AU. Aphelion is the distance from the sun that Earth receives. It arrives in early July and travels at a distance of about 94.5 million miles (152 million kilometers), or about 1 AU.

Therefore, the correct option is January (a).

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The answer is D. A more reactive metal replaces a less reactive metal in a chemical reaction.

To calculate the percent crystallinity of branched polyethylene, you need to know its density. However, the density alone is not sufficient to determine the crystallinity.

Crystallinity is usually determined using techniques such as X-ray diffraction or differential scanning calorimetry. These techniques analyze the polymer's structure and thermal behavior to determine the percentage of crystalline regions.

If you have additional information, such as the degree of branching or molecular weight, please provide it so that I can assist you further. Crystallinity is usually determined using techniques such as X-ray diffraction or differential scanning calorimetry (DSC).

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The magnitude of the force of air resistance, in newtons, on a 55-kg skydiver assuming the force of air resistance is constant can be found using the following formula:

Fr = ma fr = Force of air resistance m = ma a = acceleration

In this case, the acceleration is the acceleration due to gravity which is 9.8 m/s².

To determine the acceleration in this case, we can use the following formula:

Vf² = Vi² + 2aswhere:Vf = final velocity (maximum speed)Vi = initial velocity (0 m/s)s = displacement (height)

Therefore,51² = 0² + 2(9.8)s490 = 9.8s

Simplifying490/9.8 = s50 = sSo the displacement of the skydiver is 50 m.

Thus, the acceleration is calculated as follows:

a = Δv/ΔtwhereΔv = 51 m/s - 0 m/s = 51 m/sΔt = time taken to fall 50 m using the acceleration due to gravity which is 9.8 m/s²Δt = √(2s/a)Δt = √(2(50)/9.8)Δt = 3.18 s So, a = Δv/Δta = 51/3.18a = 16 m/s²

To determine the force of air resistance, we can use the formula Fr = ma Fr = (55)(16)Fr = 880 N

Therefore, the magnitude of the force of air resistance, in newtons, on the skydiver is 880 N.

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