Answer:
D) 8,000 m/s
Explanation:
stars have a larger gravitational force then planets
A plane flies from NY to LA at a constant speed of 800 km/hr. How long will it take the plane to fly the 4200 km? 5
As the plane plane flies at a constant speed of 800 km/hr the plane will take 5 hours 25 minutes to fly distance of 4200 km.
What is speed?Speed is defined as the rate of change of distance with time. It has the dimension of distance by time. Thus, the SI unit of speed is given as the combination of the basic unit of distance and the basic unit of Time. Thus, the SI unit of speed is metre per second. In everyday life, kilometre per hour or in countries like US and UK miles per hour are used as the unit of speed.
The SI unit of speed can be derived from the formula of velocity. Basically, velocity is the vector equivalent of speed. Mathematically, velocity is given as the ratio of displacement to the time taken.So, 800 km is traveled in 1 hour so 4200 km will be traveled 4200/800=5.25 which is 5 hours and 25 minutes.
Thus, the plane will take 5 hours 25 minutes to fly distance of 4200 km.
Learn more about speed,here:
https://brainly.com/question/7359669
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A sample of gas occupies a volume of 22.3 mL . As it expands, it does 131.5 J of work on its surroundings at a constant pressure of 777 Torr . What is the final volume of the gas?
Answer:
1.29L
Explanation:
The equation that represents the change in energy for the expansion of a gas under constant pressure is:
W = PΔV
Where W is work in atmL, P is pressure in atm and ΔV is change in volume in liters
Work in atmL:
131.5J * (1atmL / 101.325J) = 1.298atmL
P in atm:
777 torr * (1atm / 760torr) = 1.022atm
ΔV is:
W / P = 1.298atmL / 1.022atm = 1.27L
As initial volume of the gas is 22.3L = 0.0223L
Final volume = 1.27L + 0.0223L =
1.29L
A white solid was left out after a class had tidied up their
experiment. During the experiment, one of the pupils had
removed the label on the white solid. The teacher knew the
solid was a Group 1 metal halide, so they performed a
flame test followed by a silver nitrate test. The flame test
gave a red flame, and the silver nitrate test gave a cream
precipitate. What is the white solid?
Answer:
LiBr
Explanation:
Group 1 metals give a characteristic colour when subjected to flame test. The colour can tell us exactly what the identity of metal being studied.
Now, Lithium metal gives a red flame. Hence the group 1 metal ion is Li^+. Similarly, bromides give a creamy precipitate when reacted with silver nitrate.
This means that the solid substance under study is LiBr.
Help! I need to turn this in ASAP.
Answer: Potassium, Carbon and Oxygen, third option.
Explanation: K= Potassium, C= Carbon, O=Oxygen
What is the name ?
Organic Chemsitry
Answer:
The term organic chemistry originally meant the chemistry of compounds obtainable from plants and animals
A temperature increase causes the particles to what ??!
Oceans cover over 70% of Earth's surface, and precipitation constantly adds freshwater to the oceans. Yet, ocean levels remain relatively constant. Which of the following is the best explanation for why ocean levels remain constant?
A.Ocean water is continually changing from a liquid state into a vapor.
B.
Ocean water is continually seeping underground into the ocean floor.
C.
Humans alter the level of the oceans due to our need for drinking water.
D.
It is difficult to change the ocean levels due to the large size of the oceans.
Answer:
D.
Explanation:
I had looked it up on the quiz site
Answer:
A
Explanation:
i thought b but majorities of water companies dont use ocean water and use waters from rivers,and lakes yk
I dont understand and know the anwser to this
what type of bond( ionic or covalent) does silver and nobelium form?
plssss help asapp
will give brainliest!!!
Answer:
Mass of MgO = 36.27 g
Mg produced less number of moles of MgO it will act as limiting reactant while oxygen is present is in excess.
Explanation:
Given data:
Number of moles of Mg = 0.9 mol
Number of moles of O₂ = 1.1 mol
Number of moles of MgO = ?
Which reactant is in excess = ?
Which one is limiting reactant = ?
Solution:
Chemical equation:
2Mg + O₂ → 2MgO
now we will compare the moles of MgO with oxygen and magnesium.
Mg : MgO
2 : 2
0.9 : 0.9
O₂ : MgO
1 : 2
1.1 : 2/1×1.1 = 2.2
Mg produced less number of moles of MgO it will act as limiting reactant while oxygen is present is in excess.
Mass of MgO:
Mass = number of moles × molar mass
Mass = 0.9 mol × 40.3 g/mol
Mass = 36.27 g
Members in band noticed that drums seemed to vibrate and play themselves during practice. Why? A. The music was played at an natural frequency of the drums B .The music was so loud it caused the drums to vibrate Help pls!
Answer:
The music was played at an natural frequency of the drums
Explanation:
The natural frequency of a body is the frequency when we notice that the system oscillates without any driving or damping force. This is also referred to as the normal mode of vibration because all parts of the system move sinusoidally at the same frequency.
So, when music is played at the natural frequency of the drums, the drums tends to vibrate without any driving force. We can now say that the drums are 'playing themselves'.
Air pressure is caused by: gas particles striking the walls of a container or an object. b. gas particles are taking a test gas particles reaching 0 degrees Kelvin d. Air pressure has nothing to do with gas.
Answer:
D
Explanation:
Help please she need evidence!!!!!!???
Answer:
nah
Explanation:
dont wast my points
A solution of nitric acid is formed by dissolving 5.00grams of nitric acid in enough water to make 1.5 liters of solution.
c. What was the molarity of this solution?
d. What is the pH of this solution?
Molarity = 0.053 M
pH = 1.276
Further explanationGiven
5 g of HNO₃
1.5 L solution
Required
Molarity
pH
Solution
Molarity shows the number of moles of solute in every 1 liter of solution.
mol HNO₃(MW=63 g/mol) :
= mass : MW
= 5 g : 63 g/mol
= 0.079
Molarity :
=0.079 : 1.5 L
= 0.053 M
pH = -log [H⁺]
For strong acids like HNO₃ :
[H⁺] = a.M
a = valence of acid / amount of H⁺ released
M = acid concentration.
HNO₃ ⇒ H⁺ + NO₃⁻⇒ valence 1(amount of H⁺=1)
[H⁺]=1 x 0.053
[H⁺]= 0.053 M
pH= - log 5.3 x 10⁻²
pH = 2 - log 5.3
pH= 1.276
Your answer
Why is sulfur often removed from fuels before they are burnt? *
1 poi
So the fuel produces less soot when it burns.
To reduce the cost of the fuel.
To reduce acid rain.
Which of these is not produced when a fuel undergoes completo
Answer:
To reduce acid rain.
Explanation:
Sulfur often removed from fuels before they are burnt because when sulfur is burned it get converted into sulfur dioxide and when sulfur dioxide mix with atmosphere, it can cause acid rain which is very harmful.
So, in order to reduce acid rain, sulfur often removed from fuels before they are burnt.
Hence, the correct answer is "To reduce acid rain."
Can anyone help me with the final answers plzzzzz
Which is NOT a form of electromagnetic radiation?
radio waves
sound waves
x-rays
gamma waves
Sound waves is not the form of electromagnetic radiation.
The information regarding electromagnetic radiation is as follows:
It is the type of radiation that involved the radio waves, gamma rays, X-rays, visible light where the fields of electric and magnetic should be changed on the instant basis.Therefore we can conclude that sound waves is not the form of electromagnetic radiation.
Learn more: brainly.com/question/21995826
How do chemists use systems and order in their work?
Answer:
5 point) Chemists used systems and order because they study the basic unit of all forms of matter, which is the atom . However, there are several different kinds of atoms, called elements . Chemists organize these elements using the periodic table .
Explanation:
Isotopes are atoms of the same element that have the same chemical property but may not have the same physical properties A true B false
Answer:
false
Explanation:
Atoms of the same element that differ in their numbers of neutrons are called isotopes. Many isotopes occur naturally. ... Different isotopes of an element generally have the same physical and chemical properties because they have the same numbers of protons and elec
Answer:
False
Explanation:
It says that it may not have the same physical properties but it always have the same physical properties.
how many atoms are in 5.5 moles of carbon dioxide
Answer: I think the answer is, 3.312177825e+24 atoms
Explanation: I had a problem similar to this, Hope this helps!
Answer:
So if you have 5 mole, you have: 5 x (6.022 x 10^23) = 3.011 x 10^24 atoms.
Explanation:
Basically the answer is 44.0095 :)) have a great day!!
In the sixteenth century, the geocentric theory was a daim with substantial evidence. Which of the following best describes why scientists began to regard the heliocentric theory as more acceptable?
Answer:
The heliocentric theory was better supported by data explaining the rotation of the planets and other bodies in the solar system.
Explanation:
9) A cactus plant, a snake, and a hawk can be members of the same
A- community
B- kingdom
C- population
D- species
13) gene are part of a
a-cell wall
b-chromsome
c-hormone
D-vitamin
What is a reaction rate?
Answer:
Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume)
Explanation:
Answer:
A measure of how fast products are made in a reaction.
Explanation:
i just took the test and it gave me this cuz the other person was wrong
DESPERATE WILL GIVE BRAINLIST AND THANKS
Which phase of cell division is shown?
prophase
metaphase
anaphase
telophase
anaphase
or if not
telophase
When blood moves around the body, it
A. Circulation
B. Pumping
C. System
D. Circulates
Answer:d
Explanation:
What are columns on the periodic table called? What is the significance of the columns on the periodic table?
Answer:
The vertical columns of the periodic table are called groups, or families. The significance is elements with similar properties are placed in the same vertical columns. The horizontal rows of the periodic table are called periods. The significance is that properties vary from left to right along the rows.
Explanation:
We just did this in science
Answer:
columns in the periodic table are reffered to as "periods". periods represent elements with the same number of shells i.e all elements in period 1 have 1 shell (k shell) and vice versa.
Which of the following substances would have the highest dispersion forces? Why?
Ne, FCI, N2H4 SO2, SO3, C20H42, MgO, Si, CsI, Sn, H2O, CCl4
Answer:
Si
Explanation:
Dispersion force or London force is the force of attraction between two atoms or molecules in a substance in solid , liquid and gas . In gas , this force is minimum and in solid this force is maximum . In solid this force is maximum in metals in which this force forms metallic bond .
Among the given substances , Si , Sn , MgO , C₂₀H₄₂ are solid , so dispersion force will be high in them .
Among all as mentioned above , Si will have highest dispersion force . It is due to four covalent bond that bind two atoms of Si in solid silicon . Its three dimensional crystal structure consist of silicon atoms , all bound by four covalent bonds .
What volume of hydrogen gas, when combined with nitrogen gas,
is necessary to produce 16.0 L of ammonia gas (NH3)?
The volume of Hydrogen gas : 24 L
Further explanationGiven
16 L Ammonia(NH₃)
Required
The volume of Hydrogen gas
Solution
Reaction
N₂ + 3H₂ ⇒ 2NH₃
Avogadro's hypothesis:
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume will be equal to the ratio of gas moles
V₁/n₁=V₂/n₂
From the equation, mol ratio of H₂ : NH₃ = 3 : 2, so volume of H₂ :
= 3/2 x volume of NH₃
= 3/2 x 16 L
= 24 L
Who discovered electrons using Crookes tube?
a.) Democritus
b.) Ernest Rutherford
c.) Hantaro Nagaoka
d.) J. J. Thomson
e.) John Dalton
f.) Niels Bohr
Answer:
William Crookes????????????????
