The given statement is false - outside city limits, the minimum distance for parking cars from a warning cross indicating a railroad crossing is 50 meters (165 feet).
Which of the following must you keep a safe distance from when parking at a railroad crossing?Within 100 feet of a railroad crossing, bridge, tunnel, or other potentially dangerous location.
To ensure the safety of drivers on the road, the relevant authorities have made a number of rules regarding parking cars and other vehicles.
The authorities have made regulations regarding car parking close to railroad crossing signs in consideration of public safety and potential conditions relating to traffic accidents.
Because trains follow a different route and are a different mode of transportation, sometimes they must cross over the sides of the road.
The maximum length for parking a car outside the city limits has been set at 50 meters in order to prevent accidents that might happen as a result of track failure or other technical issues.
The same limit for parking a car inside the city's boundaries, however, has been set to at least 10 meters, or roughly 33 feet, due to space restrictions.
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1. Assertion:Amobea is unicellular organism and has no organs for
breathing.
R: Respiration of amobea is by diffusion.
Answer:
Amoeba has no special respiratory organs and no respiratory pigments but there is a free exchange of gases by diffusion through the general body surface which is permeable to the gases dissolved in water
Use the data table to answer the question that follows.
Production Possibilities for One Year
Cheese
(millions of tons)
United States
Italy
Tomatoes
(millions of tons)
2
1
EEEEE
Which statement is supported by the data table?
O The United States should produce neither cheese nor tomatoes but rather import them.
The United States should produce all its own cheese and tomatoes for consumption.
The United States should specialize in tomatoes and trade them for cheese from Italy.
O The United States should specialize in cheese and trade it for tomatoes from Italy.
On this scenario, the US may consume more than its PPC by specializing in cheese and swapping it for Italian tomatoes.
What makes this possible?Italy’s cheese output is lower than that of the United States.Italy cannot consume cheese other than PPC unless these products are supplied by another nation. Through an exchange deal with Italy, the United States can enjoy tomatoes in addition to PPC. Because cheese production in the United States is substantially higher than in Italy, we may assume that the United States can offer this commodity to other nations without jeopardizing its consumption. However, tomato output in the United States is the same as in Italy, but because the United States is a larger country than Italy, tomato consumption in the country may be affected.
As a result, if tomatoes are obtained from another nation, tomato consumption in the United States may surpass the PPC of tomatoes. This may be accomplished through barter, with the United States supplying cheese to Italy and Italy supplying tomatoes to the United States.
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When you squeeze the end of a toothpaste tube, toothpaste is pushed out the other end. This follows _________.
A. Boyle's Law
B. Charles' Law
C. Pascal's Principle
D. Bernoulli's Principle
Answer:
c. is the answer
Explanation:
c. Pascal principal
Rutherford used his gold foil experiment as evidence for a new atomic model. He suggested that the atom contained a small
positively charged nulceus surrounded by a large void filled with only a few electrons orbiting the nucleus.
What other experiment or evidence assisted in the creation of this model?
A)
Electrons in orbit would be captured by a nucleus.
B)
The precise location of an electron is impossible to acertain.
o
The plum pudding model of the atom agreed with the nuclear model
D)
Thomson discovered the atom contained negatively charged electrons.
Nature of Science
SC6N22) New Evidence
ID:7495
Answer:
The plum pudding model of the atom agreed with the nuclear model
Explanation:
Answer:
D) Thomson discovered the atom contained negatively charged electrons.
Explanation:
Without previous discoveries such as the electron, Rutherford would not have generated his nuclear model. So, Thomson had to discover the atom contained negatively charged electrons first.
Hope this helps :)
16% of m is 28
16% x m = 28
0.16 x m = 28
m = ...
Answer:
m=175
Explanation:
100/16 = 6.25
6.25x28 = 175
Answer: To solve this equation for m, you can divide both sides of the equation by 0.16. This will give you:
m = 28 / 0.16
Simplifying the right side of the equation gives:
m = 175
Therefore, m = 175.
Explanation:
The table shows the nature of the reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products
Reactants Products
Ionic compound + Ionic compound Ionic compound + Ionic compound
Which of the following is true about this type of chemical reaction?
It is a single replacement reaction, and all four compounds are different.
It is a double replacement reaction, and all four compounds are different.
It is a single replacement reaction, and each compound has the same set of ions.
It is a double replacement reaction, and each compound has the same set of ions.
The reaction that has been shown in the table above is a double replacement reaction, and each compound has the same set of ions. Option D
What is a reaction?Another word that we can use for reaction is what we call a chemical change. We know that a chemical change is the kind of change that will lead to the formation of a new product. It is an irreversible process as we can not be able to get back the reactants again.
We should note that there are various types of reactions. In a single replacement reaction, you would notice that there is only one substance that reacts and causes a change while in the double replacement reaction, the anions that are in the compounds that underwent the reaction would just exchange anion partners and we would have two ionic products.
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List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3 pi
There is one sigma as well as one pi bond in a double bond.
Sigma bonds and pi bonds are the two types of covalent bonds. Sigma bonds are formed when there is an end-to-end overlapping of the atomic orbitals. A pi bond is formed when there is a lateral or a side-by-side overlapping of the atomic orbitals.
The sigma bonds are represented by a "σ" symbol and pi bonds are represented by "π" symbol. One sigma bond is there in a single bond. A double bond contains one sigma as well as one pi bond. A triple bond has one sigma as well as two pi bonds.
--The given question is incomplete, the complete question is
"List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3pi, 1pi 1 sigma."--
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Which of the following is a characteristic of a strong acid?
O A. It does not conduct electricity in water.
B. It completely dissociates in water.
C. It reacts with water to form H2 gas.
O D. It increases the OH concentration.
The statement, that describes the characteristic of a strong acid is "it completely dissociates in water."
What is a strong acid?
In aqueous solution, strong acids and bases are completely ionised.
A strong acid is one that entirely ionises in solution. When dissolved in water, it emits the maximum number of hydrogen ions or protons, implying that it always loses a proton (H+).
As a result, it is possible to deduce that a strong acid (HA) entirely dissociates in solution.
Hence the correct option is B.
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Which of the following are advantages of a furnace over a flame in atomic absorption?
a. a smaller sample amount is required
b. memory effects from the previous run are not present in even the most basic version
c. the sample is atomized in only one heating step
d. less operator skill is required to determine the proper experimental conditions
e. higher sensitivity because the atomized sample is in the optical path longer
A furnace has an advantage over a flame in atomic absorption because it is more sensitive due to the lengthier time the atomized material remains in the optical path.
A process of absorption is what?Absorption in chemistry is the process by which a material that is already present in one state gets assimilated into another substance that is already present in another state (e.g., gases being absorbed by a liquid or liquids being absorbed by a solid).
What in chemistry are adsorption and absorption?Absorption and adsorption have quite different definitions. A liquid can be absorbed by a substance like a sponge, cloth, or filter paper. The absorbent substance absorbs all of the liquid. Adsorption describes the accumulation of single molecules, atoms, or ions on surfaces.
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What does 14 mean in c14?
14 mean in C14 is C14 has atomic mass of 14.
The radioactive carbon isotope with the longest half-life, carbon-14, whose decay enables precise dating of archaeological artifacts. Six protons and eight neutrons make up the carbon-14 nucleus, giving it an atomic mass of 14. Additionally, the isotope is employed as a tracer to monitor specific carbon atoms as they undergo chemical or biological changes.
The 14 in C14 represents the number of neutrons and protons in the nucleus of that atom or we can called it atomic mass. Carbon-14: with 6 protons and 8 neutrons, and an atomic mass of 14,
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when a set amount of marble chips (caco3) is added to a small amount of dilute hydrochloric acid, a reaction occurs. what should be done to decrease the rate of reaction the next time the experiment is performed
A tiny amount of weak hydrochloric acid is mixed with a quantity of marble chips (CaCO3), to decrease the rate of reaction we do decreasing the surface area of the marble chips, decreasing conc. HCL and many more.
Several ways are:-
1. Decreasing the surface area of the marble chips: By breaking the marble chips into smaller pieces, the surface area that is available for the acid to react with is reduced, slowing down the reaction.
2. Decreasing the concentration of the hydrochloric acid: By using a less concentrated solution of hydrochloric acid, the number of acid molecules available to react with the marble chips is reduced, slowing down the reaction.
3. Increasing the temperature: By performing the reaction at a lower temperature, the kinetic energy of the acid and marble chip molecules is reduced, slowing down the rate of collision between them, which slows down the reaction.
4. Using a catalyst: Addition of a catalyst to the reaction can change the reaction mechanism and decrease the activation energy needed for the reaction to occur, thus slowing down the reaction.
5. Using an inhibitor: An inhibitor is a substance that slows down the reaction by binding to the enzyme or catalytic site and preventing the substrate from binding.
It's important to note that these methods may also affect the overall yield of the reaction, so it's essential to use the appropriate method(s) for the specific experiment and goals.
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What happens when ocean water that is more dense (colder or saltier) is mixed with water that is less dense (warmer or less salty)?
please make it sound like i wrote it :(
When ocean water that is more dense (colder or saltier) is mixed with water that is less dense (warmer or less salty), the denser water will sink to the bottom and the less dense water will rise to the top. This is known as stratification, and it helps to create distinct layers in the ocean.
This stratification can create an environment that is more conducive to life, as it allows different types of organisms to inhabit different layers of the ocean.
The different layers of the ocean created by stratification play a significant role in the global climate system. Colder, denser waters are usually found at the bottom of the ocean, while warmer, less dense waters are found near the surface.
This temperature difference creates a natural convection system that drives currents throughout the ocean, which helps to regulate temperatures on a global scale. Additionally, stratification can also affect the amount of oxygen in the ocean.
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a scientist oserves a chemical reaction as it takes place. how can the scientist so in order to tell if the reaction has acheived equilibrium
A chemical reaction reaches equilibrium when the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in the concentrations of the reactants and products.
A scientist observing a chemical reaction can tell if the reaction has achieved equilibrium by monitoring the following: Concentration of reactants and products: The concentrations of reactants and products should no longer change over time if the reaction has reached equilibrium. Temperature: If the reaction has reached equilibrium, the temperature of the system should remain constant. Pressure: If the reaction is taking place in a closed container, the pressure of the system should also remain constant if the reaction has reached equilibrium. It's worth noting that the equilibrium is a dynamic process, meaning that the concentrations of reactants and products will remain constant over time, but the chemical reaction is still taking place.
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Calculate the mass of metal oxide produced during the decomposition of 1280 g of 77.5% pure magnesium carbonate!
Decomposition of one mole of magnesium carbonate (84 g) produces one mole of magnesium oxide (40 g). Thus, 1280 g of magnesium carbonate will produce 609 g of MgO.
What is magnesium carbonate?Magnesium carbonate is an ionic compound formed by donation of two electrons from magnesium metal to the carbonate group.
The decomposition reaction of magnesium carbonate is written below:
[tex]\rm MgCO_{3} \rightarrow MgO + CO_{2}[/tex]
As per this reaction, one mole of magnesium carbonate produces one mole of MgO.
molar mass of MgCO₃ = 84 g/mol
molar mass of MgO = 40 g/mol
84 g of MgCO₃ gives 40 g of MgO. Then the mass of MgO produced by 1280 g of MgCO₃ is:
mass of MgO = (1280 × 40)/84 = 609 g.
Therefore, the mass of MgO produced is 609 g.
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When 10g of hydrogen gas react with chlorine gas, how many liters hydrogen monochloride (HCl) will be produced at STP
The amount of hydrogen monochloride that is produced at STP is 152 mL.
The balanced chemical reaction can be depicted as follows:
H₂ + Cl₂ -----> 2 HCl
According to stoichiometry, When one mole of hydrogen reacts with one mole of chlorine, it yields two moles of hydrogen monochloride. Stoichiometry defines the relationship between the quantities of reactants and products before, during, and following chemical reactions
If, 2 g of Hydrogen reacts with 71 g of chlorine to form 73 g of Hydrogen Chloride.
Therefore, if 10 g reacts with 142 g of chlorine, the HCl produced will be 152 g or 152 ml of HCl.
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What are the two factors that affect the arrangement of particles in a substance?
The two factors that affect the arrangement of particles in a substance are kinetic energies and intermolecular forces.
In chemistry, all the substances are composed of tiny particles which are in constant motion.
The substance which is made up of atoms, ions or molecules, all the particles possess kinetic energy and keep moving in all direction. On the other hand, intermolecular forces are also present in a substance which keeps the particles together within their boundaries and doesn't let them go far away. In this way substances maintain their shape, arrangement and properties.
In sum, two factors play a crucial role in maintaining the properties of a substance: Kinetic energy and intermolecular forces.
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An increase in the temperature of a liquid decreases the rate of
evaporation, true or false?
Answer:
False
Explanation:
The increase in the temperature of a liquid also increases the rate of evaporation, as the same for the other way around. As intermolecular force increase rate of evaporation decreases. This happens because intermolecular force make it less likely for the molecules on the surface to escape from liquid and become vapour gas. As temperature increases rate of evaporation increases.
Which aqueous solution is expected to have a pH less than 7 at 25∘C?
a) LiNO3 (aq)
b) NH4Br (aq)
c) RbC2H3O2 (aq)
d) MgCl2 (aq)
[tex]NH_{4} Br[/tex](aq ) is expected to have a Ph less than 7 as on dissociation the following constituents will separate
[tex]NH_{4} Br[/tex] + [tex]H_{2}O[/tex] → [tex]NH_{4} OH[/tex](weak base) + [tex]HBr[/tex] (strong acid)
A weak base is a strong acid hence B is correct
[tex]LiNO_{3}[/tex] It is a salt of a strong base and weak acid hence basic and a PH greater than 7
[tex]MgCl_{2}[/tex]it is a salt of a strong base and strong acid hence a neutral solution of PH 7
[tex]RbCH_{2} H_{3} O_{2}[/tex] It is a salt of a strong base and weak acid hence basic and a PH greater than 7
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Potassium(k)=1s22s22p63s23p64s
it’s asking for the electron configuration
The atomic number of Potassium(K) is 19
Knowing the number of electrons in the K atom is necessary before we can write the potassium(K) electron configuration.
There are 19 electrons. All 19 electrons will be positioned in orbitals surrounding the nucleus of the potassium(k) atom when the configuration is written.
there are some steps:
The initial two electrons in the configuration for potassium(k) will be in the 1s orbital.The following two electrons for potassium enter the 2s orbital since the 1s orbital can only accommodate two electrons. Then the 2p orbital receive the six electrons. The p orbital has room for up to six electrons. The first Six electrons will be positioned in 2p orbital, while the next two will be positioned in the 3s. As the 3s are currently full, we'll switch to the remaining six electrons to the 3p.Now we change the 4s orbital and add the final electron.To know more about Orbital, click here:
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When you boil a pot of liquid water, the water turns to steam and rises in the air. This is an example of what.
A: condensation
B: precipitation
C: evaporation
D: absorption
Answer:
Hello There!!
Explanation:
The answer is C: evaporation because evaporation is the process in which a liquid boils then evaporates and lastly becomes a gas.
hope this helps,have a great day!!
~Pinky~
According to the forces of attraction, when you boil a pot of liquid water, the water turns to steam and rises in the air. This is an example of evaporation.
What are forces of attraction?
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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What are the types of elements answer?
The three types of elements are metals, non-metals as well as metalloids, there are placed in a periodic table.
In a periodic table, metals are placed in s-block and d-block. While non-metals as well as metalloids are placed in p-block. Metals are generally lustrous, malleable as well ductile in nature and are usually hard in nature while non-metals lack these properties. Metalloids are the elements whose chemical as well as physical properties lies between both metals and non-metals. Examples of metals are sodium and potassium. Examples of non-metals are carbon and phosphorus while examples of metalloids are silicon and germanium.
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what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
Mass (often measured in grams) & volume are the two characteristics in this module through which we will create unit components to do statistical approach using different chemicals .
What exactly is a chemical substance?Chemical substances come in three different forms: elements, compounds, and mixtures. Elements are basically chemicals that don't contain any other substances. In this sense, elements are the fundamental constituents of chemical composition.
How should chemicals be categorized?The component can be an isotope or a combination if it is pure. If a substance can be divided into its component elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or even a heterogeneous mixture. If the composition remains the same throughout, the combination is homogeneous.
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C3H8 + 3O2 → 3CO2 + 4H2
How many moles of oxygen are necessary to react completely with 7.2 moles of hydrogen?
(round to the tenth's place)
Taking into account the reaction stoichiometry, a amount of 5.4 moles of oxygen are necessary to react completely with 7.2 moles of hydrogen.
Reaction stoichiometryIn first place, the balanced reaction is:
C₃H₈ + 3 O₂ → 3 CO₂ + 4 H₂
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
C₃H₈: 1 mole O₂: 3 molesCO₂: 3 moles H₂: 4 molesMass of O₂ requiredThe following rule of three is used: If by reaction stoichiometry 4 moles of H₂ are produced by 3 moles of O₂, 7.2 moles of H₂ are produced by how many moles of O₂?
moles of O₂= (7.2 moles of H₂×3 moles of O₂)÷ 4 moles of H₂
moles of O₂= 5.4 moles
Finally, 5.4 moles of oxygen are required.
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A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?
O Length
O Mass
O Temperature
O Volume
A chemist reported that 100 gallons of a gas were available in a laboratory, The property of the gas did the chemist report is volume option - D is correct answer.
Just what is volume?The space occupied by a three-dimensional object is measured using the scalar quantity known as volume. The volume of a liquid or gas is calculated using the container's capacity as the unit of measurement.
A state of matter known as gas lacks a consistent shape and a set volume. They are the least dense and have the most space between their moles.
A gallon is a unit of volume that is used in the American metric system. The volume of gas equals the sum of the moles of gas in the container, which contains 100 gallons of gas.
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How many atoms are in a 4.67 g sample of silicon?
Answer:
3.62
Explanation:
Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 7.41 mL of O2 had passed through the membrane, but only 3.47 mL of of the unknown gas had passed through. What is the molar mass of the unknown gas
164 g is the molar mass of the gas that had passed through.
Effusion is defined as the pace at which a volume changes over time. We apply Graham's Law to determine the rate of gas diffusion. According to this law, the rate of a gas's effusion or diffusion is inversely related to the gas's molar mass squared.
[tex]\frac{Rate Gas 1}{Rate Gas 2}[/tex]=[tex]\frac{ \sqrt{MW gas 2} }{ \sqrt{MW gas 1} }[/tex]
Let gas 1 be Oxygen so Molar mass = 32 g / mol
Let x be gas 2. Molar mass = unknown
rate gas 1 = 7.41 ml/unit time
rate gas 2 = 3.47 ml / unit time
So, 7.41 / 3.47 = [tex]\frac{\sqrt{x} }{\sqrt{36} }[/tex]
2.135 = s[tex]\frac{\sqrt{x} }{\sqrt{36} }[/tex]
[tex]\sqrt{x}[/tex] = 12.81
so, x = 164 = molar mass of unknown gas
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What is the nuclear symbol for an ion with a charge of +220 protons and 24 neutrons 
Answer:
Hey there! The nuclear symbol for an ion with a charge of +220 protons and 24 neutrons would be written as follows:
220+ 24
The symbol consists of two parts: the atomic number (220+) and the atomic mass (24). The atomic number is the number of protons in the nucleus of an atom, and it is represented by a superscript on the left side of the symbol. The atomic mass is the total number of protons and neutrons in the nucleus, and it is represented by a subscript on the right side of the symbol.
In this case, the atomic number of the ion is 220, which indicates that it has 220 protons in its nucleus. The atomic mass is 24, which indicates that it has a total of 220 protons + 24 neutrons = 244 particles in its nucleus.
________________________________________________________
How do we represent the properties of atoms and ions using nuclear symbols?Nuclear symbols are a way of writing down the important information about atoms and ions in a short and easy-to-read format. They usually consist of two parts: the atomic number and the atomic mass. The atomic number tells us how many protons an atom has in its nucleus, and the atomic mass tells us the total number of protons and neutrons. For example, the nuclear symbol for carbon is 6 12C, which tells us that carbon has 6 protons and 12 particles (6 protons + 6 neutrons) in its nucleus.
How do we determine the number of protons, neutrons, and electrons in an atom or ion?To determine the number of protons in an atom or ion, we can look at its atomic number, which is usually written as a superscript on the left side of the nuclear symbol. For example, if the nuclear symbol for an atom or ion is written as 6 12C, we can tell that it has 6 protons. To determine the number of neutrons, we can subtract the atomic number from the atomic mass. For example, if the atomic mass is 12 and the atomic number is 6, then the number of neutrons is 12 - 6 = 6. To determine the number of electrons, we can just look at the overall charge of the atom or ion. If it is neutral, then it will have the same number of protons and electrons. If it is positive or negative, then it will have more or fewer electrons than protons, respectively.
Select all that identify an ionic bond.
metal - metal
metal - metal
metal - nonmetal
metal - nonmetal
nonmetal - nonmetal
nonmetal - nonmetal
metal - polyatomic
metal - polyatomic
polyatomic - polyatomic
polyatomic - polyatomic
polyatomic - nonmetal
Answer:
metal - metal
metal - metal
metal - polyatomic
metal - polyatomic
metal - nonmetal
metal - nonmetal
When using a TSO-C129 or TSO-C196 GPS for navigation and instrument approaches, any required alternate airport must have
TSO-C129 and TSO-C196 refer to non-WAAS GPS systems. TSO-C146 refers to WAAS-enabled GPS systems. If non-WAAS GPS is used for navigation and instrument approaches, all required alternate airports must have non-GPS approved operational instrument approach procedures.
TSO-C129 - Airborne Auxiliary Navigation Sensor for Global Positioning System equipment with airborne extensions. TSO-C196 – Auxiliary airborne navigation sensor for GPS units with airborne augmentation.
TSO certification means minimum performance standards for certain materials, parts and equipment used in commercial aircraft. Authorization to manufacture materials, parts, or equipment in accordance with TSO standards is referred to as TSO authorization.
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What is the difference between a solution and a suspension.
Answer:
In a solution, the solute particles that are in the solvent are evenly mixed and so small that you can't see them. In a suspension, the pieces of solute are large and can be seen floating throughout the solvent. For example, dust floating through the air is a suspension.