approxiamtely how many human-made objects entered earth's orbit in 2020

Answers

Answer 1
the answer is that the skies above Earth are teeming with more than 8,000 manmade objects but more than 27,000 pieces are mostly “space junk”, but 3 have entered earths orbit in 2020

Related Questions

The strength of the force of gravity between two objects depends on which factors?

Answers

Answer: It depends on both mass and distance

a diatomic ideal gas is compressed adiabatically from 3 m3 to 1.4 m3. if the initial pressure is 71 kpa, calculate the final pressure in kpa.

Answers

The final pressure of the diatomic gas that is expanded adiabatically is 140 KPa.

For any adiabatic process, the relation between volume and pressure is given by,

PVⁿ = C

Where P is the pressure and V is the volume,

C is a constant and

n  is adiabatic index.

It can be written,

PVⁿ = pvⁿ

The value of adiabatic index for a diatomic gas is 1.44.

P is the initial pressure which is given to be 71KPa,

V is the initial volume which is given to be 3m³.

p is the final pressure,

v is the final volume which is given to be 1.4m³.

So, now putting all the values accordingly,

(3×71000)^1.44 = (1.4×p)^1.44

p = 140KPa

So, the final pressure is 140 KPa.

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Imagine that bubbles begin to form in a sample of liquid, but the temperature did not change. What must have happened to cause this change?​

Answers

If the bubbles begin to form in a sample of liquid,but the temperature did not change. this is a process of boiling as liquid and gas (bubble) co-exist.

At the location of heating, liquid begins to transform into its vapour state. The liquid changes into gas, which manifests as bubbles.

The heat energy is transmitted to the water molecules during boiling, causing them to flow more swiftly. The molecules eventually become too energetic to maintain their connection as a liquid. This results in the formation of gaseous water vapour molecules, which float to the surface as bubbles and move through the air.

When the saturation solubility of air is exceeded in a solution, air bubbles begin to develop. When a solution is exposed to air and the air entering and exiting the solution are balanced, the amount of air that finally dissolves in the solution is known as its saturated solubility (in equilibrium state).

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an unknown element has two primary isotopes, one with a relative abundance of 99.63 percent and a mass of 14.00307 u, and another with a relative abundance of 0.37 percent and a mass of 15.0011 u. what is the atomic weight of this element?

Answers

Protons and neutrons make up the compact, dense nucleus of an atom, which is positively charged and comparatively hefty.

How do you determine an element's Amu?

The total number of protons and neutrons in an isotope's nucleus is referred to as the mass number. This is due to the fact that each proton and neutron has a mass of one atomic mass unit (amu). You may get the mass of the atom by multiplying the total number of protons and neutrons by 1 amu.

What does "1 amu" or "1u" mean to you?

An element's atomic mass is expressed in terms of the atomic mass unit (AMU or amu) also referred to as the unified atomic mass unit or the Dalton (Da) (u)both atomic and molecular masses through the AMU. AMU is described as being one-twelfth the mass of a carbon-12 atom (12C).

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Examine Table 10.3 and list the compounds you think have hydrogen bonds. Explain why.

Answers

Answer

Ethanol and Ethylene Glycol

Procedure

Hydrogen bonding occurs when hydrogen forms a molecular bond with a highly electronegative element such as Oxygen, Nitrogen, and Fluorine. Based on the structure of the molecules we can see that ethane does not contain the previously mentioned elements, therefore it will not form hydrogen bonds. Dimethyl ether has an oxygen atom located in the middle of the molecule, making it difficult to form a bond with other dimethyl ether molecules.

Lastly, Ethanol and Ethylene Glycol possess OH groups which are free to interact with similar groups via hydrogen bonding. Additionally, these last compounds exhibit higher boiling points, which can indicate a stronger intermolecular bonding, which is a characteristic of hydrogen bonding.

is basalt the best source for garnet

Answers

Basalt is a good source of granet but not the best. Granite can be a better source for it.

What is special about basalt?

Olivine, pyroxene, and plagioclase are the major minerals that makeup basalt, which is abundant in iron and magnesium. The majority of specimens have a glassy, compact, fine-grained texture. Additionally, they may contain plagioclase, augite, or olivine phenocrysts and be porphyritic. Basalt may have a coarsely porous texture due to gas bubble-induced holes.

The metamorphic rocks are where you'll find the garnets that make rocks. Particularly in granite and granitic pegmatite, which occur in igneous rocks. Clastic sediments and sedimentary rocks occasionally contain garnets that were formed from such rocks. The primary type of rock used to make cogged stones, basaltic scoria, is made from magmas that effusively erupt at the surface as lava flows and are mostly generated from various regions of the Earth's mantle or lower crust.

Hence, basalt is not the best source for granet.

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Basalt is not typically considered a primary source of garnet. Garnet is a mineral that occurs in a variety of rock types, including metamorphic rocks like schist and gneiss, as well as some igneous rocks like granite. While it is possible for garnet to occur in basaltic rocks, it is not the most common or abundant source.

The most significant sources of garnet are often associated with metamorphic processes, where the mineral can crystallize and grow within specific temperature and pressure conditions. Garnet can also be found in placer deposits, which are accumulations of minerals in sedimentary environments like riverbeds and beaches, where erosion has concentrated heavy minerals like garnet.

If you are specifically looking for sources of garnet, it's more common to find it in rocks like schist, gneiss, and certain types of sedimentary rocks, rather than basalt. However, the presence of garnet in any rock type depends on the geological history of the region.

Carbon tetrachloride is a colorless liquid. How many molecules of carbon tetrachloride are in 6.32 mg of that compound?

a. 2.47 x 10^19
b. 5.85 x 10^23
c. 6.82 x 10^29
d. 1.64 x 10^24

Answers

Option A.

The number of molecules of carbon tetrachloride in 6.32 mg of the compound is 2.47 x 10¹⁹ molecules.

What is the molecular mass of Carbon tetrachloride?

The molecular mass of Carbon tetrachloride is calculated as follows;

Molecular formula = CCl₄

CCl₄ = (12) + (35.5 x 4)

CCl₄ = 154 g/mol

The number of moles of carbon tetrachloride in 6.32 mg is calculated as follows;

n = reacting mass / molar mass

n = (6.32 x 10⁻³) / (154)

n = 4.1 x 10⁻⁵ moles

1 mole of CCl₄ = 6.02 x 10²³ molecules

4.1 x 10⁻⁵ moles of CCl₄ = ?

= 2.47 x 10¹⁹ molecules

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an element with a mass of 780 grams decays by 18% per minute. to the nearest minute, how long will it be until there are 30 grams of the element remaining?

Answers

A 780 gram element decays at a rate of 18% every minute. 780 elements are still missing (1-0.171) 19 .

Element:

What does that mean?

A basic object that is difficult to divide into smaller bits is described as an element. An element is a chemical that cannot be broken down by non-nuclear processes in physics or chemistry. A discrete component of a bigger structure or collection is referred to as an element in computers and mathematics.

Element and atom definitions?

The most basic form of a material is an element. In general, it cannot be streamlined or broken down into smaller parts. A constituent of an element is an atoms. A specific element only has one kind of atom per atom. Charged particles, neutrons, and electrons, which are particles, make up the remainder of an atom.

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how many grams of mgso 4 4 ​ should be used if you desire to make 1.0 grams of mgcl 2 2 ​ ? do not include units in your answer. make sure your answer has at least 3 significant digits

Answers

The mass (in grams) of MgSO₄ That should be used is 1.26 g

How to determine the mass of MgSO₄

We'll begin by writing the balanced equation for the reaction. This is given below:

MgSO₄ + 2HCl —> MgCl₂ + H₂SO₄

Molar mass of MgSO₄ = 24 + 32 + (16 × 4) = 120 g/molMass of MgSO₄ from the balanced equation = 1 × 120 = 120 gMolar mass of MgCl₂ = 24 + (35.5 × 2) = 95 g/mol Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g

Finally, we shall determine the mass of MgSO₄ needed for the reaction as follow:

From the balanced equation above,

95 g of MgCl₂ were produced from 120 g of MgSO₄

Therefore,

1 g of MgCl₂ will be produce from = (1 × 120) / 95 = 1.26 g of MgSO₄

Thus, the mass of MgSO₄ needed is 1.26 g

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Look at the DNA sequence below, and circle any places where a mutation would occur.
G-C
G-C
A-T
T-A
T-T
G-T
A-T
C-G
C-A

Answers

T-T,  G-T, C-A are wrong and are places where a mutation would occur as they don't follow Chargaff's rule

What are mutations?

Mutations occur during DNA replication if errors are made and not corrected in time

A point mutation occurs in genome when a single base pair is added, deleted or changed.

What is Chargaff's rule?

Erwin Chargaff proposed the Chargaff's rule.The DNA of any organism should have purine and pyrimidine bases in  1:1 ratioThis rule played an essential role in discovering double-helical structure of DNA.Rule states that in any double-stranded DNA, the ratios between Adenine and Thymine and Guanine and Cytosine are constant and equal.Adenine forms double bond with thymine and Guanine forms triple bond with cytosine.

From the above details we can conclude that T-T,  G-T, C-A are wrong and are places where a mutation would occur.

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Atmospheric pressure is

Question 3 options:

only present at sea level


greater in the upper atmosphere than in the lower atmosphere


the weight of the air, or atmosphere, that is felt by everything on earth


greater in the mountains than at sea level

Answers

Atmospheric pressure is the weight of the air or atmosphere that is felt by everything on earth. Option B.

When you press the plunger the air inside the tube and plunger will bubble out. Atmospheric pressure is applied to the surface of the liquid. Release the valve and the water in the tube will move. The atoms and molecules that make up the various layers in the atmosphere are constantly moving in random directions.

Despite its small size when it collides with a surface it exerts a force on that surface and perceives it as pressure. A low-pressure area also called a low-pressure area, is an area where the atmospheric pressure is lower than the surrounding area. Lows are usually associated with strong winds warm air and atmospheric rise.

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Calculate the number of joules given off when 32.0 grams of steam cools from 110.0 C to ice at -40.0 C
Pls show work

Answers

Answer: POINT GRIND

Explanation:

JUGUY

The formula for magnesium chloride is MgCl2.

How many magnesium atoms are there in one molecule?

Responses

zero

zero

one

one

two

two

three

Answers

Answer:

Foe example,the atomic mass of magnesium(24.3050) shows us that the average mass of magnesium atoms is about twice the average mass of carbon atoms(12.011),so the mass of 6.022 x 10²³ magnesium atoms is about twice the mass carbon atoms hope you understand thanks Jason

What would you conclude about chloride based on your results in the flame tests in part c?.

Answers

The conclusion is that chloride does not emit light in visible range.

As per the image, we can see the differentiating factors are the metal ions. With different metals, the chloride salt gives different flame colour.

As we know, all the electrons absorb energy and emit it while returning from excited state to ground state. The wavelength of this emitted energy is perceived by us as colours.We can state that these colours are of metals and chloride ions themself do not emit colour in visible range.

Also, metal salts of chlorine are volatile. The metal chloride vapourises quickly and hence is suitable for the detection of metal ions.

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The image is attached in the diagram..

what are the classical elements of donatello's david? choose all answers that apply: choose all answers that apply

Answers

A revival of classical concern in and respect for the seen in Donatello's David. The free-standing classical figure antiquity Donatello's David. The sculpture exhibits an eroticism that is typical of its era.

How does Donatello's David represent the early Renaissance?

Being the first free-standing statue constructed since antiquity and the first freestanding standing bronze sculpture cast during the Renaissance, Donatello's David was immensely ground breaking when it was created.

How does David by Donatello depict humanism?

The detailed substance of Donatello's sculpture of David, which had no other aesthetic or practical function other than to display his sculpting abilities, was what he saw as the sculpture's uniqueness. David and the skull of the enormous Goliath make up the majority of a book's material.

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5. How many hydrogen atoms are in 1 gallon of octane?
Density of octane= 0.7028 g/mL, 3780 mL = 1 gal

Answers

The chemical formula for octane, C8H18, is an alkane and a hydrocarbon. Its condensed structural formula is CH3(CH2)6CH3. The amount and location of branching in the carbon chain determine the various structural isomers of octane.

Carbon is represented by the letter C, octane by the formula C8H18. As a result, there will be 8 moles of carbon for every mole of C8H18.

Utilizing the molar mass of octane, convert 20 kg of octane to moles of octane.

Octane's molar mass is calculated as (8*12.011)+(18*1.008)=114.23 g/mole, where 8 and 18 are the molecule's atoms and 12.011 and 1.008 are the carbon and hydrogen atoms' individual molar masses.

20kg C8H18*1000g/kg*mole

C8H18/114.23g C8H18 = 175.1 moles of octane.

Put that quantity of moles into moles of carbon now:

1400.8 mole C is equal to 175.1 mole C8H18 * (8 mole C/mole C8H18).

Now keep in mind that a mole of a specific element equals 6.022*1023 atoms.

As a result, your final answer of 8.4*1026 atoms, or 1400.8 mole C, is identical to 1400.8*(6.022*1023) atoms C.

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which statement regarding the acid-base characteristics of the 20 common amino acids is false?a.they can act as buffers.b.each has three pka values.c.they generally exist as zwitterions at physiological ph.d.they have a characteristic isoelectric point.

Answers

The correct answer is  

Option C.

they generally exist as zwitterions at physiological ph.

What is zwitterions ?

A zwitterion, also known as an inner salt or a dipolar ion, is a molecule that has an equal number of positively and negatively charged functional groups. The word "zwitterion" comes from the German word "hermaphrodite" (tsvt). [2] A chemical equilibrium will be created between the "parent" molecule and the zwitterion in a solution of amino acids, for instance.

Because the positive charge is on a quaternary ammonium group, betaines are zwitterions that cannot isomerize to an all-neutral form. A molecule with both a carboxylate group and a phosphonium group cannot isomerize, either.

The amino acid is the basic building block of proteins, consisting of a carboxyl, an amino, and a variable R-group. The R-group in amino acids is what makes them unique. The condensation reaction between the carboxyl group of one amino acid and the amino group of another amino acid results in the formation of a peptide bond between the two amino acids.

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The heat capacity of solid iron is 0.447 Jewels per gram in celsius. If the same quantity of energy as in #3 were transferred to a 450g chunk of iron at 20 Celsius, what would be the final temperature?

Answers

After transferring 65 kJ of heat, the iron's final temperature will be 343.14.

What is specific heat?

The amount of heat necessary to increase the temperature of 1 g of a substance by 1 degree Celsius is known as the specific heat.

One can provide the specific heat by:

Q = mcΔT

Q equals 65 kJ of specific heat

0.447 J/g is the heat capacity, or c.

450 g is the iron's mass, or m.

ΔT = temperature change, or final temperature minus initial temperature.

ΔT=20 - final temperature

The values being entered into the equation:

65000 J = 0.447 J/g 450 g

(Final temperature - 20) 65000 J = 201.15

Temperature at the end minus 20 = 323.14

Temperature at the end: 343.14.

After transferring 65 kJ of heat, the iron's final temperature will be 343.14.

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100 POINTS!! HELP ASAP

Answers

Answer:

B and C which are the same

Explanation:

neutral ph which ranges about from 0 to 7 it is about where water is

The graph below shows a reaction profile for the reaction between hydrogen and oxygen.
What do the labels W, X, Y and Z represent?

Answers

W is reactants , Z is products ,X is activation energy and Y is overall energy change.

Why is activation energy significant and what does it entail?

The least amount of energy necessary to start a reaction is called activation energy. We need to first consider how a chemical reaction happens in order to comprehend activation energy. Even if they haven't tied it to chemistry, everybody who has ever lighted a fire will have an instinctive grasp of the procedure.

The temperature at which a reaction is carried out affects its pace. The molecules travel more quickly and clash more frequently as the temperature rises.

Molecules become more energetic and move more quickly as the temperature rises. Therefore, the likelihood that molecules will be travelling with the required activation energy for a reaction to occur upon impact increases with increasing temperature.

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Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the
chemical equation: 1
DH₂0-DH₂ + O₂
Intro
Lot 10
Done

Answers

Answer:

D = 2

2H₂0 → 2H₂ + O₂

Explanation:

I'll assume that "DH₂0-DH₂ + O₂" is meant to read:

 

   DH₂0 → DH₂ + O₂

Water decomposes into oxygen (O2) and hydrogen (H2) molecules.

We are to find a vale of D that will balance this equation.

        DH₂0 → DH₂ + O₂

Count the atoms on both sides of the equation, assuming D is 1 at this point:

 (D = 1)

 Element  Reactant  Product Balanced?

       H            2               2            Yes

       O            1                2            No

We need an additional oxygen atom on the reactant side, so lets try D=2:

2H₂0 → 2H₂ + O₂

 Element  Reactant  Product Balanced?

       H            4               4           Yes

       O            2               2           Yes

The equation is balanced for D = 2:

2H₂0 → 2H₂ + O₂

Part 1: Composition of the Atm Name the three major gases in the atmosphere from greatest to least

Answers

Answer:

1) Nitrogen

2)Oxygen

3)Argon

Explanation:

Nitrogen has 78.1 % gasses

Oxygen has 20.9 % gasses

Argon has 0.93 % gasses

Sep plan and carry out an investigation: plan an investigation using water, a glass, and a bucket to demonstrate that thermal energy is not the same temperature ??

Answers

In bucket the thermal energy is more than the glass

Thermal energy is the energy contained within a system that is responsible for its temperature

The water in the bucket is more than the glass so thermal energy of the bucket is higher than the glass water and the thermal energy is the total amount of kinetic energy of the molecules in the system means in bucket the molecules are more and water are also more so the thermal energy is greater than the glass

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100 POINTS!
A gas with a pressure of 2.25 atm occupies 450.0 mL at a temperature of 300 K. What is the volume at 405.0 K?


a
333.3 mL
b
270.0 mL
c
750.0 mL
d
607.5 mL

Answers

Answer:

D) 607.5 mL

Explanation:

Combined Gas Law: P1V1/T1=P2V2/T2

Substitute: [2.25(450)]300=[2.25(V)]/405

Solve for V: 3.375=2.25V/405

3.375(405)=2.25V

1366.875=2.25V

V=607.5 mL

which molecule below has a nonpolar bond in which the electrons are being shared equally? a) h2o b) nh3 c) cl2 s) hcl

Answers

Answer:

C) Cl2

Explanation:

Water (H2O), Ammonia (NH3), and Hydrochloric aid (HCl) are all polar. Cl2 is the only non-polar out of the answers and the electrons are shared equally.

which organ system is most related to the endoplasmic reticulum in cells

Answers

Answer:

That is the circulatory system

Explanation:

Because both the circulatory system and endoplasmic reticulum play transport roles

Organ system that is most related to the endoplasmic reticulum in cells is of liver and kidneys.

Endoplasmic reticulum is found in cytoplasm of eukaryotic cells. These helps to transport protein in different parts of cell and helps in its survival. It is the main component of the endomembrane system.

Liver and the kidneys are the places where detoxification of anything takes place. These helps in keeping body pure and toxin free. Liver helps in detoxifying the harmful compounds whereas kidney purifies the blood and circulate it back to body. Liver cells have a lot of endoplasmic reticula to facilitate purification of alcohols, drugs, etc.

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Eric wants to make sure he understands the parts of a good scientific investigation. He knows that scientific investigations include many different steps. During a scientific investigation, which step occurs after a scientist collects data?
A:Draw conclusions

B:Form the hypothesis

C: Plan the experiment

D: Follow the procedure

Answers

Answer:

B. Form the hypothesis

Explanation:

After collecting data and observations, a scientist makes a hypothesis and plans an experiment to test said hypothesis.

Expressing Opinions: Compare the advantages and disadvantages of solar heating systems. What do you think their overall benefits are, compared with those of other heating systems?

Answers

Answer: Solar heating systems are energy efficient, but the amount of heating they can accomplish would not be very much in cold climates. Overall, it seems they could be put to good use in a lot of places in the world and could save a lot of energy.

Explanation:

because thats how science works ig

Using the standard enthalpies of formation, what is the standard enthalpy of reaction? co(g) h2o(g)⟶co2(g) h2(g)

Answers

The standard enthalpy of reaction is - 41.166 kJ/mol

What is enthalpy of reaction ?

For a chemical reaction, the enthalpy of reaction is the difference in enthalpy between products and reactants

What is enthalpy of formation ?

The enthalpy of formation of a substance is defined as heat change i.e heat evolved or absorbed when 1 mole of substance is formed from its elements under given conditions of temperature and pressure

The standard enthalpy of reaction is

ΔH° reaction = Σ ΔH°f ( products) - Σ ΔH°f (reactants)

                     = [ΔH°f (CO₂ g) + ΔH°f (H₂ g)] - [ ΔH°f (CO g) + ΔH°f (H₂O g)]

                     = [ -393.509 + 0 ] - [(-110.525) + (-241.818) ]

                     =   -393.509 + 352.343

                     = - 41.166 kJ/mol

Thus we can conclude that the standard enthalpy of reaction is - 41.166 kJ/mol

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Note: The correct question for the above solution is

Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO(g) + H₂O(g) = CO₂(g) + H₂(g)

ΔH°f (CO(g)) = -110.525KJ/mol

ΔH˚f (CO₂ (g)) = −393.509KJ/mol

ΔH°f (H₂O(g)) =-241.818KJ/mol

ΔH°f  (H₂(g)) = 0

identify the type of interactions involved in each of the following processes taking place during the dissolution of sodium chloride ( nacl ) in water.

Answers

The answers include the following below:

Solvent-Solvent interactionsInteractions involving dipole-dipole interaction, interactions between the water moleculesSolute-Solute interactionsInteractions between ions of sodium chloride, interactions involving ion-ion attractionsSolute-Solvent interactionsInteractions formed between the sodium ions and the oxygen atoms of water molecules, interactions formed between the chloride ions and the hydrogen atoms of water molecules.

The dissolution of salt in water is as a result of the combination of the solute which is the salt and solvent which is the water. Interactions go on between water molecules which is referred to as the Solvent-Solvent interactions and so on.

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