Answer:
The photographic evidence of a long-unseen cosmic force is an extraordinary achievement in science. ... Exciting as it is, the photo actually doesn't capture the black hole itself, nor its interior. Astronomers aimed their telescopes at the event horizon, the invisible boundary thought to surround all black holes
Explanation:
Hope this helps :)
Which of the following is true about an object falling on Earth?
A.The force of air resistance makes the object fall faster.
B.The force of air resistance counteracts the force of gravity.
C.The force of air resistance acts in the same direction as the force of gravity.
What effect is used to determine the speed of distant stars?
the Einstein effect
the Doppler effect
the Hubble effect
the Galaxy effect
Answer:
doppler effect
Explanation:
''The Doppler effect occurs for light as well as sound. For instance, astronomers routinely determine how fast stars and galaxies are moving away from us by measuring the extent to which their light is “stretched” into the lower frequency, red part of the spectrum''
is the cause of rapid oxidation explosion
Write the orbital notation for element 53.
Answer:
Its complete electron configuration is 1s22s22p63s23p64s23d104p65s24d105p5.
Explanation:
what is generally true about the compressibility of solids?
Answer:
That it is hard to compress
Explanation:
What phase of matter would the above substance be at 500⁰C?
Answer:
Is 4 an answer? If so, that is correct
Explanation:
A mixture is what you get when you combine two substances in such a way that no chemical reaction occurs between the components. A solution is a mixture that looks exactly the same everywhere. Which of these mixtures is a solution
A) a fruit salad
B) a chocolate chip cookie
C) a mixture of sugar and salt
D) a mixture of sugar and water
I have a few question please help its due in a few hours 1. Determine the specific heat of a certain metal if a 450 gram sample of it loses 34,500J of heat as its temperature drops by 97K
2. The temperature of a 25 gram sample of a certain metal drops by 103 K as it loses 2600 joules of heat. What is the specific heat of the metal?
3.What is the final temperature after 840 Joules is absorbed by 10.0g of water at 298K?
(please show steps)
Answer:
c = 0.79 j/g.K
c = 1 j/g.K
T2 = 123.1 K
Explanation:
1)
Given data:
Mass of metal = 450 g
Heat loses = 34,500 j
Temperature drop = ΔT = 97 K
Specific heat of metal = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
34500 j = 450 g ×c × 97 K
34500 j = 43650 g.K ×c
c = 34500 j/43650 g.K
c = 0.79 j/g.K
2)
Given data:
Mass of metal = 25 g
Heat loses = 2600 j
Temperature drop = ΔT = 103 K
Specific heat of metal = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
2600 j = 25 g ×c × 103 K
2600 j = 2575 g.K ×c
c = 2600 j/2575 g.K
c = 1 j/g.K
3)
Given data:
Mass of water = 10 g
Heat absorbed = 840 j
Initial temperature drop = 298 K
Final temperature = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
840 j = 10 g ×4.18 j/g.K × [T2 - 103 K]
840 j = 41.8 J/K × [T2 - 103 K]
840 J/41.8 J/ K = T2 - 103 K
20.1 k = T2 - 103 K
T2 = 20.1 K + 103 K
T2 = 123.1 K
Need answer ASAP.
Which areas of the Earth receive the LEAST amount of sunlight?
A-the equator
B-the temperate zone
C-the tropics
D-polar regions
The mass of an oxygen–18 atom is 18.0042 amu. Compute the calculated mass.
Answer:
The calculated mass of one atom of oxygen-18 is approximately 2.99×10⁻²³ grams
Explanation:
The given mass of an oxygen-18 atom = 18.0042 amu
The definition of the atomic mass unit is the mass equivalent to the mass of one twelfth the atomic mass of one atom of carbon-12. The atomic mass unit is used to express the mass of an isotope of an element
1 amu = 1.66 × 10⁻²⁴ grams
Therefore;
18.0042 amu = 18.0042 × 1.66 × 10⁻²⁴ grams ≈ 2.99×10⁻²³ grams
The calculated mass of one atom of oxygen-18 ≈ 2.99×10⁻²³ grams
The atomic mass unit can be taken as the mass in grams of one mole of the substance
Therefore, the mass of one mole of the oxygen 18 atom = 18.0042 g
what element is 1s2 2s22p6 3s23p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f10
The given electronic configuration is that of an element named dysprosium.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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24 Points!! 12 Points Each Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
14. C , 15. C. 16. B , 17. D They are all right
Explanation:
Which six elements are generally considered metalloids
Answer:
boron, silicon, germanium, arsenic, antimony, and tellurium
1pt According to Einstein's theory of gravity, the more mass an object has, the
O A. denser it will be
O B. more it will warp space
C. faster it will rotate
OD. more moons will circle it
Answer:
B. more it will warp space
Explanation:
What is the step that usually comes last in solving numeric problems
When the wedges are removed, predict which way the carts will move. Justify your prediction.
Answer:
I believe the carts will move towards each other, as positive and negative charges attract each other.
Explanation:
It is like a magnet when you put the opposite sides together. (North and South, South and North) or the plus goes to the minus and the minus goes to the plus.
If you take out the far left and right wedges, it may move a little away for a few seconds, but will move back together .
Another hypothesis is that if the sheets are flimsy, the sheets will attract each other, however, the sheets will join together at the top, but the carts will still stay at the same place.
How do molecules move in gas
Answer:
They become fast that they don't touch each other
Explanation:
That's it sorry that I can't help any further
What is the volume of the toy car that has a density of 3 g/mL and a mass of 75 g.
Answer:
The volume of car having density 3 g/mL and mass 75 g is 25 mL.
Explanation:
Given data:
Volume of car = ?
Density of car = 3 g/mL
Mass of car = 75 g
Solution:
The given problem will be solved through density formula.
Density:
Density is equal to the mass of substance divided by its volume.
Formula:
D=m/v
D= density
m=mass
V=volume
Now we will put the values in formula.
3 g/mL = 75 g/ v
v = 75 g/ 3 g/mL
v = 25 mL
The volume of car having density 3 g/mL and mass 75 g is 25 mL.
when a sample of CO2(s) becomes CO2(g), there is a change is
Explanation:
hope it helps you please make me brainlest (it's a photo)
Describe the three mechanisms of heat flow (conduction, convection, and radiation), and the factors that influence their rates.
Answer:
Just as interesting as the effects of heat transfer on a system are the methods by which it occurs. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, as through a cooking pan, or slowly, as through the walls of a picnic ice chest. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet every heat transfer takes place by only three methods:
Conduction is heat transfer through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know that thermal motion of the atoms and molecules occurs at any temperature above absolute zero.) Heat transferred from the burner of a stove through the bottom of a pan to food in the pan is transferred by conduction.
Convection is the heat transfer by the macroscopic movement of a fluid. This type of transfer takes place in a forced-air furnace and in weather systems, for example.
Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of Earth by the Sun. A less obvious example is thermal radiation from the human body.
:)
Further more info...
Conduction:
As you walk barefoot across the living room carpet in a cold house and then step onto the kitchen tile floor, your feet feel colder on the tile. This result is intriguing, since the carpet and tile floor are both at the same temperature. The different sensation is explained by the different rates of heat transfer: The heat loss is faster for skin in contact with the tiles than with the carpet, so the sensation of cold is more intense.
Convection :
In convection, thermal energy is carried by the large-scale flow of matter. It can be divided into two types. In forced convection, the flow is driven by fans, pumps, and the like. A simple example is a fan that blows air past you in hot surroundings and cools you by replacing the air heated by your body with cooler air. A more complicated example is the cooling system of a typical car, in which a pump moves coolant through the radiator and engine to cool the engine and a fan blows air to cool the radiator.
Radiation :
You can feel the heat transfer from the Sun. The space between Earth and the Sun is largely empty, so the Sun warms us without any possibility of heat transfer by convection or conduction. Similarly, you can sometimes tell that the oven is hot without touching its door or looking inside—it may just warm you as you walk by. In these examples, heat is transferred by radiation. That is, the hot body emits electromagnetic waves that are absorbed by the skin. No medium is required for electromagnetic waves to propagate. Different names are used for electromagnetic waves of different wavelengths: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
Scientists often work on projects for a long time and fail to see sources of error in their research. Which process allows an outside expert to look at the scientist's project and point to sources of error? direct funding peer review conclusive research data collection
Answer:
The correct approach is Option B (Peer Review).
Explanation:
Rather made reference to someone as a scientific peer-review, it encourages the specialist who has not been essential to the study team to analyze the study objectively and pointed out everyone's mistakes. It serves as major self-regulation for scholars and aims to make the publishing process somewhat credible. Hence, the solution to this issue is Peer Examination.Funding organizations rarely have the capabilities to recognize out mistakes, whereas definitive analysis is a method of study that helps to make a definitive statement. The gathering of data is simply a process of scientific study.Other approaches do not apply to the example mentioned. Although the one mentioned is right.
Answer:
peer review
Explanation:
let me guess you're doing Edguity unit test
2Mg(PO4)2
Mg =
-
P =
O =
Answer:
262.8577 g/mol
Explanation:
The molar mass and molecular weight of Mg3O8P2 is 262.858.
Answer:
The molar mass and molecular weight of Mg3O8P2 is 262.858.
Explanation:
what is the systematic or IUPAC name for SO2
Answer:
Sulfur trioxide
Sulfur trioxide | SO3 - PubChem.
Explanation:
Help Please : Will Mark Brainliest !!
How many protons? And how many electrons? (2pts)
How many valence electrons? (1pt)
Which noble gas does your element want to be like? (1pt)
Will the element give or gain electrons to form an ion? How many electrons? (2pts)
What charge will the element form? (1pt)
Will it be a cation or an anion? (1pt)
my element is arsenic btw and I NEED TO THIS TONIGHT BECAUSE GRADES ARE DUE
Pls help me asap ❤️ i need HELP
Answer:
whats the question, can't help if I don't know the question
Brainleist if correct
___________is part of the Milky Way Galaxy.
Answer:
Our Sun (a star) and all the planets around it are part of a galaxy known as the Milky Way Galaxy.
Which is an example of how water is used inside and around the home?
fishing in a lake
washing clothes at the laundromat
brushing teeth before bed
washing a car in an automatic carwash
An example of how water is used inside and around the home is brushing teeth before bed. Details about water management can be found below.
How is water utilized?Water is a inexhaustible or renewable resource that can be used for domestic and personal purposes.
Water can be used around the home in the following ways:
Brushing of teethTaking one's bathDoing dishesTherefore, an example of how water is used inside and around the home is brushing teeth before bed.
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One of the main goals of environmental science is to help humans use the environment in a way that is economically profitable.
true or false
Answer:
true this is correct its your econimically
Why do you think many metals are good at conducting electricity?
Hurry, please!!!