Why are some constellation and stars visible all year but others are only visible during specific times of the year?

Answers

Answer 1

As Earth makes its way around the sun (earth orbit) along a tilted path relative to its own axis we experience staggered views of different stars and constellations depending on where we find ourselves across our annual trajectory.

What is Earth's orbit around the sun?

The cycle of our planet traveling along an elliptical orbit around the sun provides us with what we know as a year or roughly 365.25 days of time measurement; however, this orbital path isn't uniformed and appears like a flattened circle with one focus positioned near our star - The Sun.

This causes changes in distance between both objects throughout different periods of time during its annual journey; for instance, early January denotes when we reach perihelion or our shortest distance from Sun while we hit aphelion on early July - marking our farthest measured distance from it.

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Related Questions

Write the formulas for the reactants and products. Balance the chemical equation.

Combination/Synthesis Reaction:

Sodium + Oxygen —>

Answers

Explanation:

2Na+O2=2N2Ois balanced one

PLEASE HELP!!

How many moles are contained in 7.88 x 10^24 atoms of Iron?

Answers

Answer:

Explanation:

9.55 mol of Al

Explanation:

To obtain the number of moles of a certain element given the number of atoms only, you have to divide it with Avogadro's number,  

Answer:  mutiply them

Explanation:

Aside from invasives like the crown-of-thorns starfish, what other factor is killing the Great Barrier Reef?
O increased temperatures
O overactive algae
O reactive forms of oxygen
O coral bleaching

Answers

Answer:

increased temperatures

Explanation:

The temperatures are increasing in the ocean because of ocean warming, by climate change. The heat in the ocean stresses healthy corals, which drains them of their vibrant colors, known as bleaching.

kylie jenner wants to test if red or pink lipstick makes her lips look bigger. what is the independent variable here?

Answers

Answer:

her ugly duck lips

Explanation:

Answer:

her lips.

Explanation:

the dependent variable is the lip stick because it changes but her lips do not actually change at all, ......i think. ;)

A car travelling
at 35 m/s has a
kinetic energy
of 500,000 J.
what is the
mass?

I NEED HELP FIGURING THIS OUT

Answers

Answer:

816.33 kg

Explanation:

To solve this problem we'll need to keep in mind the formula for the kinetic energy of an object:

E = 0.5 * m * v²

Where E is the kinetic energy, m is the object's mass and v its velocity.

We input the data given by the problem:

500000 J = 0.5 * m * (35 m/s)²

And solve for m:

m = 816.33 kg

Why are invasive species such a huge threat to ecosystems?

Invasive species are impossible to control once they are introduced and spread rapidly

Invasive species can replace native species, forcing their migration out of the area

Invasive species provide no added benefit or diversity to the ecosystem

Invasive species can do intense damage so much so that ecosystems may not be able to recover

Answers

Answer: Its D the guy above is wrong dont use his answer he got me a 75

Explanation:

Need help fast help help help. Help

Answers

Answer:

fjnjfzgnf

Explanation:

Answer:

it blank !

Explanation:

what is the effect of heat and light on chemical reaction​

Answers

Answer:

Exothermic reactions release heat and light into their surroundings. For example, combustion reactions are usually exothermic. In exothermic reactions, the products have less enthalpy than the reactants, and as a result, an exothermic reaction is said to have a negative enthalpy of reaction.

Answer:

Is it fire onn a bottle?

Explanation:

Because I thought that if you shine light ona ANYTHING plastic, the chemical reaction is a little fire.

Can someone help me please

Answers

Answer:

the answers are a, f, g

and lastly e because they all describe a liquid

6. Which of the process would you use to remove salt
dissolved in water?
opicean .Filtration, evaporation, chlorination​

Answers

Answer:

Evaporation

Explanation:

You can use evaporation to separate the salt from the water.

evaporation is the correct answer

An antacid tablet with an active ingredient of CaCO3 was dissolved in 50.0 mL of 0.300 M HCl. When this solution was titrated with 0.300 M sodium hydroxide, 32.47 mL was required to reach the end point. Determine the mass (in grams) of calcium carbonate in the tablet. Molar Mass of CaCO3

Answers

Answer:

Explanation:

mole of HCl remaining after reaction with CaCO₃

= .3 M of NaOH of 32.47 mL

= .3 x .03247 moles

= .009741 moles

Initial HCl taken = .3 x .005 moles = .0015 moles

Moles of HCl reacted with CaCO₃

= .009741 - .0015 = .008241 moles

CaCO₃     +    2HCl   =   CaCl₂  +  CO₂  +  H₂O .

1 mole        2 moles

2 moles of HCl reacts with 1 mole of  CaCO₃

.008241 moles of HCl reacts with .5 x .008241 moles of  CaCO₃

CaCO₃ reacted with HCl =  .5 x .008241 = .00412 moles

the mass (in grams) of calcium carbonate in the tablet

= .00412 x 100 = .412 grams . ( molar mass of calcium carbonate = 100 )

We have that  the mass (in grams) of calcium carbonate in the tablet  is mathematically given as

mass of  CaCO₃= 0.412 grams

The mass (in grams) of calcium carbonate in the tablet

Question Parameters:

An antacid tablet with an active ingredient of CaCO3 was dissolved in 50.0 mL of 0.300 M HCl. titrated with 0.300 M sodium hydroxide, 32.47 mL was required to reach the end point.

Generally the equation for the mole of HCl  is mathematically given as

mole of HCl = 0.3 M of NaOH of 32.47 mL

mole of HCl= 0.3 x 0.03247 moles

mole of HCl= 0.009741 moles

Therefore

Initial HCl taken = 0.3 x 0.005 moles

Initial HCl taken= 0.0015 moles

Moles of HCl reacted with CaCO₃

M_{hcl}= 0.009741 - .0015

M_{hcl}= .008241 moles

The Chemical Equation

CaCO₃     +    2HCl   =   CaCl₂  +  CO₂  +  H₂O .

Therefore, CaCO₃ reacted with HCl is

CaCO₃ reacted with HCl=  0.5 x 0.008241

 CaCO₃ reacted with HCl= .00412 moles

Hence,the mass of   CaCO₃ is

mass of   CaCO₃ = 0.00412 x 100

mass of   CaCO₃= 0.412 grams

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What is full ground state electron configuration of C-?

Answers

Answer:

[tex]1s^{2}[/tex] [tex]2s^{2}[/tex] [tex]2p^{2}[/tex]

Explanation:

Simply [tex]1s^{2}[/tex] [tex]2s^{2}[/tex] [tex]2p^{2}[/tex]

Coal has two valent electrons, so there is 2 in 2p orbital

A relationship in which one variable increases as the other variable decreases is an inverse relationship.
CA. True
B. False

Answers

Answer:

TRUE

Explanation:

HOPE IT WILL HELP YOU

An aqueous solution of sodium chloride, NaCl has a mol fraction of 0.15. calculat the molality of NaCl​

Answers

Answer:

8.8mol/l

Explanation:

but I'm not percent sure.

8.8 u r welcome
Llllllll

what is the expirement

Answers

Answer:

A Experiment is an operation or procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law

Explanation:

Brainliest pls

what is the mass in grams of 0.687 moles of NH three

Answers

NH3 = 14 +3*1=17 g/mol
Mass = mol * molar mass = 0.687 * 17= 11.679 g
Can u mark it brainliest?

When a soda is poured into a glass and the soda bubbles, is it the result of a chemical change? Explain your answer.

Answers

yep b/c bubbles and fizzing are a couple of characteristics of a chemical change

HELP ASAP!!!!!!!!!!
What is sous-vide?


A food stabilizer

B liquid food that chefs make into a spherical shape

C food that chefs quickly freeze using liquid nitrogen

D food that chefs seal in a plastic bag and cook under controlled temperature conditions

Answers

Answer:

D) food that a chef seal in a plastic bag and cook under a controlled temperature condition.

Explanation:

Sous vide, also known as low temperature long time cooking, is a method of cooking in which food is placed in a plastic pouch or a glass jar and cooked in a water bath for longer than usual cooking times at a precisely regulated temperature. 

Which of the following are more likely to form a solution? (select all that apply)

A) When both solute and solvent are polar
B) When both solute and solvent are nonpolar
C) When solute is polar and solvent is nonpolar
D) When solute is nonpolar and solvent is polar

Answers

Answer:A and B

Explanation:

A substance is said to be polar when it is having a dipole (a delocalised positive and negative charge) or it is ionic (dissociate into ions when dissolved in water)

A balloon is filled with 30L of helium gas at 1atm.What is the volume when balloon rises to an attitude where the pressure is only 0.25 atm?

Answers

Answer:

[tex]V_2=120L[/tex]

Explanation:

Hello!

In this case, since Helium is undergoing a volume-pressure change, according the Boyle's law, we infer the following equation is used:

[tex]P_1V_1=P_2V_2[/tex]

Thus, since we are not given the volume at 0.25 atm, we can solve for V2 to do so:

[tex]V_2=\frac{P_1V_1}{P_2}[/tex]

Thus, we plug in to obtain:

[tex]V_2=\frac{1atm*30L}{0.25atm}=120L[/tex]

Best regards!

The final volume of the balloon at the given altitude is 120 L.

The given parameters;

initial volume of the balloon, V₁ = 30 Linitial pressure, P₁ = 1 atmfinal pressure of the balloon, P₂ = 0.25 atm

The final volume of the balloon at the given altitude is calculated by applying Boyles law as follows;

[tex]P_1 V_1 = P_2 V_2\\\\V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{30 \times 1 }{0.25} \\\\V_2 = 120 \ L[/tex]

Thus, the final volume of the balloon at the given altitude is 120 L.

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Are the gas laws affected depending on whether you use heavy gas particles or light gas particles? If anything, what is affected by the size of the molecule?

Answers

Answer:

yes

Explanation:

Yes, size of molecule has greatly affected the gas law.

The gas laws affected depending on whether we use heavy gas particles or light gas particles because the heavy gas particles can't move faster as light gas particles with the increase of temperature.

If the temperature is increased, the gas particles move faster due to absorb of heat energy so they hit the walls of the container. This causes the pressure to rise. The pressure of a gas also increases when the volume of container in which it is placed is decreased. Bigger the molecule size, the stronger the intermolecular forces, so the molecule has higher melting and boiling points so we can conclude that big size molecule greatly affected the gas law.

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According to the quantum-mechanical model for the hydrogen atom, which electron transition produces light with the longer wavelength: 3p + 2s or 4p + 3p? Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help increases As the n level increases, the energy and thus the levels are each 3p → 2s other. Therefore, the transition would have a greater energy difference than the transition from inversely decreases Energy and wavelength are proportional, so the transition would farther from produce a longer wavelength. 4p + 3p directly closer to

Answers

Answer:

Explanation:

The main task here is that there are some missing gaps in the above question that needs to be filled with the appropriate answers. So, we are just going to do rewrite the answer below as we indicate the missing gaps by underlining them and making them in bold format.

SO; In the quantum-mechanical model of the hydrogen atom.

As the n level increases. the energy increases and thus levels are closer to each other. Therefore, the transition 3p→2s would have a greater energy difference than the transition from 4p→3p.

[tex]Energy \ and \ wavelength \ are \ inversely \ proportional , \ so \ the \ \mathbf{ 4p\to 3p} \ transition \ would[/tex][tex]produce \ a \ longer \ wavelength.[/tex]

A student determines the molar mass of acetone, CH3COCH3, by the method used in this experiment. She found that the equilibrium temperature of a mixture of ice and water was 1.0 degrees C on her thermometer. When she added 11.1 g of her sample to the mixture, the temperature, after thorough stirring, fell to -3.0 degrees C. She then poured off the solution through a screen into a beaker. The mass of the solution was 90.4 g.a) What was the freezing point depression?b) What was the molality of acetone? I need help especially with this one.c) How much acetone was in the decanted solution?d) How much water is in the decanted solution?e) How much acetone would there be in a solution containing 1 kg of water and acetone at the same concentration as she had in her experiment?f) What did she find to be the molar mass of acetone, assuming she made the calculation properly?

Answers

Answer:

(a). 4°C, (b). 2.4M, (c). 11.1 g, (d). 89.01 g, (e). 139.2 g and (f). 58 g/mol.

Explanation:

Without mincing words let's dive straight into the solution to the question.

(a). The freezing point depression can be Determine by subtracting the value of the initial temperature from the final temperature. Therefore;

The freezing point depression = [ 1 - (-3)]° C = 4°C.

(b). The molality can be Determine by using the formula below;

Molality = the number of moles found in the solute/ solvent's weight(kg).

Molality = ( 11.1 / 58) × (1000)/ ( 90.4 - 11.1) = 2.4 M.

(c). The mass of acetone that was in the decanted solution = 11.1 g.

(d). The mass of water that was in the decanted solution = 89.01 g.

(e). 2.4 = x/ 58 × (1000/1000).

x = 2.4 × 58 = 139.2 g.

(f). The molar mass of acetone = (12) + (1 × 3) + 12 + 16 + 12 + (1 x 3) = 58 g/mol.

Question 4 (4 points)
(01.03 MC)
An energy transformation flow diagram is shown.
X-
ELECTRICAL
ENERGY
What type of energy does X most likely represent? (4 points)
O a
X = gravitational energy

X = mechanical energy
Ос
= thermal energy
Od
X = radiant energy

Answers

I don’t know what is your problem

Answer:

I think radiant I’m not sure

Explanation:

P4 +502 — P4010

What is the limiting reactant if you are using 25.0 grams of phosphorus and 50.0 grams of oxygen?


A.) O2


B.) P4


C.) P4O10


D.) P4O2

Answers

Answer:

B.) P4

Explanation:

Step 1: Convert 25.0 grams of phosphorus into moles of phosphorous:

25 g P4 x 1 mol P4/123.90 g P4 = 0.202 mol P4

Step 2: Convert 0.202 mol P4 into moles of O2 using their stoichiometric ratios:

0.202 mol P4 x 5 mol O2/1 mol P4 = 1.01 mol O2

Step 3: Convert 1.01 mol O2 into grams of O2:

1.01 mol O2 x 31.98 g O2/1 mol O2 = 32.3 g O2

Because 25.0 grams of phosphorous only needs 32.3 grams of oxygen to react, phosphorous will be the limiting reactant, as after the 25.0 grams of phosphorous is used up, there will still be 17.7 grams of oxygen leftover (excess reactant).

Because the reaction cannot occur without more phosphorous to react with the 17.7 grams of oxygen remaining, P4 is the limiting reactant.

Answer:  B.) P4

Explanation:

Step 1: Convert 25.0 grams of phosphorus into moles of phosphorous:

        25 g P4 x 1 mol P4/123.90 g P4 = 0.202 mol P4

Step 2: Convert 0.202 mol P4 into moles of O2 using their stoichiometric ratios:

        0.202 mol P4 x 5 mol O2/1 mol P4 = 1.01 mol O2

Step 3: Convert 1.01 mol O2 into grams of O2:

        1.01 mol O2 x 31.98 g O2/1 mol O2 = 32.3 g O2

Because 25.0 grams of phosphorous only needs 32.3 grams of oxygen to react, phosphorous will be the limiting reactant, as after the 25.0 grams of phosphorous is used up, there will still be 17.7 grams of oxygen leftover (excess reactant).

Because the reaction cannot occur without more phosphorous to react with the 17.7 grams of oxygen remaining, P4 is the limiting reactant.

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Explain why anhydrous aluminium chloride is fairly soluble in organic solvent while anhydrous magnesium chloride is insoluble​

Answers

Answer:

The correct answer is - anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.

Explanation:

Anhydrous aluminum chloride is a covalent compound and we know that covalent compounds have less or no polarity. Organic compounds or solvents are mostly non-polar in nature. And it is a thumb rule that like-dissolves-like.

Thus they dissolve covalent molecules like anhydrous aluminum chloride.

Anhydrous magnesium chloride is an ionic compound that tends to interact with a polar solvent but not in a non-polar solvent such as organic solvents.

Anhydrous aluminum chloride is fairly soluble in the organic solvent while anhydrous magnesium chloride is insoluble​ because anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.

Why is AlCl3 soluble in organic solvent?

AlCl3 quite simply accepts electrons from other atoms, in an try and get a full valence shell of eight electrons. It's why it normally behaves as a Lewis acid. In the response under, the Al atom accepts a lone pair of electrons from a Cl atom.

Why is AlCl3 soluble in water?

AlCl3 is hygroscopic and has a great affinity for water. Therefore, aluminum chloride dissolves in water partially.

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Please help 3. The combustion of glucose is represented by the following balanced equation: C6H12O6 + 602 - 6H20 + 6CO2.
Which reactant is the limiting reagent if there is 1 gram of both C6H12O6 and O2? (Hint: Must convert to moles to determine this.)
O a C.H 20
O bO2
O c H₂O
Od CO₂

Answers

Answer:

Explanation:

C₆H₁₂O₆       +      60₂     =     6H₂0     +     6CO₂.

1 mole              6 mole

molecular weight of C₆H₁₂O₆ = 180 g

molecular weight of oxygen = 32 g

1 gram of glucose = 1 / 180 = 5.55 x 10⁻³ moles

1 gram of oxygen = 1 / 32 = 31.25 x 10⁻³ moles

1 mole of glucose reacts with 6 moles of oxygen

5.55 x 10⁻³ moles of glucose will react with 6 x 5.55 x 10⁻³ moles of oxygen

= 33.30 x 10⁻³ moles of oxygen .

But oxygen available = 31.25 x 10⁻³ moles

So available oxygen is less than required .

Hence oxygen is the limiting reagent .

b ) is the right option .

A balloon full of air has a volume of 1.00L at a temperature of 23 °C. What is the balloon's volume at 33°C?
Answer:1.03L
How do I solve this?

Answers

Answer:

V2= 1.03L

Explanation:

Start off with what you are given.

V^1: 1.00L

T^1: 23°C

V^2?

T^2: 33°C

If you know your gas laws, you have to utilise a certain gas law called Charles' Law:

V^1/T^1 = V^2/T^2

Remember to convert Celsius values to Kelvin whenever you are dealing with gas problems. This can be done by adding 273 to whatever value in Celsius you have.

(23+273 = 296)     (33+273 = 306)

Multiply crisscross

1.00/296= V^2/306

296V^2 = 306

Dividing both sides by 296 to isolate V2, we get

306/296 = 1.0337837837837837837837837837838

V2= 1.03L

Given that blood exerts the same osmotic pressure as a 0.15 M NaCl solution, which solution could be the hypertonic solution?/search?

a. 0.68 M NaCl solution
b. 0.15 M NaCl solution
c. 0.008 M NaCl solution

Answers

Answer:

a. 0.68 M NaCl solution

Explanation:

The tonicity of a solution can either be hypotonic, hypertonic and isotonic. Hypertonic solution is a solution which possesses a higher concentration of solute in relation to another solution.

According to this question, a solution is said to contain 0.15 M NaCl solute. This means that a solution that will be hypertonic to this solution will have a much more concentration of solute, which based on the options provided is the 0.68 M NaCl solution.

Which illustration is a closed circuit? * + A B​

Answers

Answer:

I believe its B for sure

Hope this helps!

Explanation:

I think it is B, by far. Hope this helps you out
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Which of the following occurs when all aspects of the parties' duties under the contract are carried out perfectly? a. Complete performance b. Singularity A 120 m long copper wire (resistivity 1.68 X 10^-8 ohm meter) has aresistnace of 6.0 ohm. What is the diameter of the wire? (Points:1)0.065 mm0.65 mm0.65 cm0.65 m change the code so the response to ""i want x"" is ""would you really be happy if you had x?"" The Flynn effect best illustrates that the process of intelligence testing requires up-to-dateA) factor analyses.B) standardization samples.C) reliability indices.D) heritability estimates. true/false. the type of play known as alea is not present in the brazilian carnaval. which phylum fits the following description: the palm-like plants of the tropics; the least changed group of the present-day gymnosperms. You have been tasked to research the relationship between academic performance and studying either alone or in a group. How would you design the study if you were doing a correlational study? How would you design the study if you were doing an experimental study? Between these two designs which one would be the best method in this case? Why? a 1.00-m3 object floats in water with 40.0% of its volume above the waterline. what does the object weigh out of the water? the density of water is 1000 kg/m3. which windows tool do you use to create and delete partitions on hard drives? Which compound is a heteropolysaccharide? Select one: O a. hyaluronate O b. cellulose Oc. glycogen O d. chitin O e. starch How does Mr. Xs perspective in lines 4-12 impact the plot? (SLO Reading C-LT1) Mr. X is characterized as sociable, which reveals his motivation for talking, excessively, to Mr. Y. Mr. X suggests the following theme: Thieving is wrong, but stealing is forgivable if ambition is the reason. The central conflict is revealed when Mr. X expresses his disapproval of need-based stealing. Moving from Europe to America would solve two problems by bringing Mr. X closer to his wife and decreasing their cost of living Calculate the molarity of the oxalic acid solution if 25 00 ml of 0. 2500 m naoh is required to trate 20. 00 ml of oxalic acid the reaction hc2o4 naoh --> if you connect to a wi-fi network that does not require a wireless network key, it is still secure enough to send private information because wireless networks encrypt all data anyway.T/F A computer password consists of four letters (A through Z) followed by a single digit (0 through 9). Assume that the passwords are not case sensitive (i.e., that an uppercase letter is the same as a lowercase letter). (a) How many different passwords are possible? (b) How many different passwords end in 1? (c) How many different passwords do not start with Z? (d) How many different passwords have no Z's in them? in which layer of the network communication process is the message packaged in a format suitable for the network and sent to the nic driver? write the net cell equation for the electrochemical cell. phases are optional. do not include the concentrations. sn(s)||sn2 (aq,0.0155 m)ag (aq,1.50 m)||ag(s) Find the surface area of the cylinder. Round your number to the nearest tenth if necessary3ft 2ft An LC circuit oscillates at a frequency of 10.4kHz. (a) If the capacitance is 340F, what is the inductance? (b) If the maximum current is 7.20mA, what is the total energy in the circuit? (c) What is the maximum charge on the capacitor? let x and y be discrete random variables with joint pmf px,y (x, y) = 0.01 x = 1, 2 ..., 10, y = 1, 2 ..., 10, 0 otherwise. 6.00 moles of an ideal gas is placed in a closed container that has a volume of 0.005 m. If the temperature of the gas is 30.0C, what is the pressure of the gas? (R-8.31 J/mol-K) 1.51 x 10 O 1.30x10 Pa O 26 x 10'P O 3.02 x 100 PM