Answer:
A. Gravity and Tension
Explanation:
Gravity and Tension would be the only things changing the rising speed of the elevator.
Normal makes no sense not sure why that is an answer.
Gravity effects how much Tension is pulling on the elevator to go down while the elevator is pushing up.
Let me know if you have any other questions.
A piece of unknown metal absorbed 790.24 J of heat as it was heated from 40.0°C to 72.0°C. If the piece of metal weighed 55.0 g, what is the identity of the metal?
Answer:
Given metal is iron
Explanation:
Given data:
Heat absorbed = 790.24 J
Initial temperature = 40.0 °C
Final temperature = 72.0 °C
Mass of metal = 55.0 g
Identity 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
ΔT = 72.0°C - 40.0°C
ΔT = 32 °C
790.24 J = 55 g ×c × 32 °C
790.24 J = 1760 g. °C ×c
c = 790.24 J /1760 g. °C
c = 0.449 J/g. °C
The specific heat capacity of iron is 0.449 J/g. °C thus, given metal is iron.
If the mass ratio of K to F in a compound is 2.06:1, how many grams of F are needed to react with 101g of K?
Mass of F to react with 101 g of K = 49.03 g
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired
The mass of compounding compounds can also be calculated.
For example, the mass ratio of oxygen (O) and hydrogen (H) elements in H₂O remains at 8: 1. So if you know the amount of mass of oxygen you can know the amount of hydrogen and water mass.
The mass ratio of K to F in a compound is 2.06:1, so the mass of F to react with 101 g of K :
[tex]\tt =\dfrac{1}{2.06}\times 101\\\\=\boxed{\bold{49.03~g}}[/tex]
A gas is trapped in a 56 liter vessel. The temperature inside is 234 Celsius and thepressure is 1.1 atmospheres. What is the new pressure if the volume is compressed to54 liters and the temperature is lowered to 200 oC?
Answer:
The new pressure is 1.06 atmospheres
Explanation:
We can calculate the new pressure from using the Combined gas law equation.
The combined gas law equation is
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
Where [tex]P_{1}[/tex] is the initial pressure
[tex]V_{1}[/tex] is the initial volume
[tex]T_{1}[/tex] is the initial temperature
[tex]P_{2}[/tex] is the final pressure
[tex]V_{2}[/tex] is the final volume
and [tex]T_{2}[/tex] is the final temperature
From the question,
[tex]V_{1}[/tex] = 56 L
[tex]T_{1}[/tex] = 234 °C = (234 + 273.15)K = 507.15K
[tex]P_{1}[/tex] = 1.1 atm
[tex]V_{2}[/tex] = 54 L
[tex]T_{2}[/tex] = 200 °C = (200 + 273.15)K = 473.15K
Now, to determine [tex]P_{2}[/tex] (the new pressure), we will put the given values into the equation
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
[tex]\frac{1.1 \times 56}{507.15}= \frac{P_{2} \times 54 }{473.15}[/tex]
∴ [tex]P_{2} = \frac{1.1 \times 56 \times 473.15 }{54 \times 507.15}[/tex]
Then,
[tex]P_{2} = \frac{29146.04 }{27386.1}[/tex]
[tex]P_{2} = 1.06[/tex] atm
Hence, the new pressure is 1.06 atmospheres.
please help!!! i need help asap!!!
Newest crust is found at
a- divergent boundaries
b- subduction zones
c- continent-continent collisions
What sublevel has five orbitals?
Answer:
Explanation:
Option D is the correct answer
Answer:
3d
Explanation:
answer D
a muddy stream quickly flows downhill. When it reaches a flatter area, the stream moves more slowly, and the water clears.Explain why the stream changes appearance.
Answer: it calms it down and it dries and evaporates easier?
Explanation: I think that's how to explain it but I rlly dont want to get it wrong but i need points to ask a question
What is the density of alunimium?
Answer:
2.7 g/cm³
Explanation:
Answer:
5000.9 mgl
Explanation:
bzbzbbxbdhuzuz
Fill in the blank with the correct number to balance the equation: 4Al + O2 → 2Al2O3. (Enter only a whole number.)
Answer:
3
Explanation:
You have to balance the atoms. On the right side there are 6 oxygen. In order to get the other side even you need a 3 coeficcient to get 6 oxygen on the left. That is the best way I can explain it.
The energy of a pendulum is recorded at different positions in the table below. Use the data in the table to determine the amount of kinetic energy the pendulum had at Position 2. dude i will give yall brainlest
Answer:
36.55 J
Explanation:
PE = Potential energy
KE = Kinetic energy
TE = Total energy
The following data were obtained from the question:
Position >> PE >>>>> KE >>>>>> TE
1 >>>>>>>> 72.26 >> 27.74 >>>> 100
2 >>>>>>>> 63.45 >> x >>>>>>>> 100
3 >>>>>>>> 58.09 >> 41.91 >>>>> 100
The kinetic energy of the pendulum at position 2 can be obtained as follow:
From the table above, at position 2,
Potential energy (PE) = 63.45 J
Kinetic energy (KE) = unknown = x
Total energy (TE) = 100 J
TE = PE + KE
100 = 63.45 + x
Collect like terms
100 – 63.45 = x
x = 36.55 J
Thus, the kinetic energy of the pendulum at position 2 is 36.55 J.
Is this statement true or false?
Global warming is likely the result of human activity
Answer:Explanation:
This is True.
Answer:
True.
Explanation:
If humanity was never a thing or if humanity was a thing but the average human being is able to take care of the environment, then no damage would be caused and Global Warming would probably not exist.
Gloria’s family built a new deck using building materials made from recycled plastic bottles. As they were heated, the plastics softened and were formed into new shapes. These plastics were ______________ solids, and their particles are arranged ________________ . These solids are different from __________________solids, which melt at a specific temperature. *
5 points
1. crystalline, vibrating, amorphous
2. amorphous, in no regular pattern, crystalline
3. amorphous, in a regular pattern, crystalline
2. crystalline, in no regular pattern, viscosity
Answer:2
Explanation:
Solid are divided into two based on arrangement of particles, one is amorphous solid and other is crystalline solids. Therefore the correct option is option 2.
What is amorphous solid?Amorphous solid is a solid which is not crystalline and whose atoms are not arranged in regular pattern. particles are randomly arranged. Whereas in crystalline solids particles are arranged in a particular fashion. Example of amorphous solid is plastic, glass etc. Example of crystalline solids are all salts like sodium chloride.
Plastics are amorphous solids, and their particles are arranged in no regular pattern. These solids are different from crystalline solids, which melt at a specific temperature.
Therefore the correct option is option 2 that is amorphous, in no regular pattern, crystalline
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Which combination of elements would most likely form an ionic compound?
A sodium and fluorine
B. carbon and chlorine
C. hydrogen and oxygen
D. silicon and sulfur
Answer: not quite sure but I think A sounds best
Explanation:
Answer:
A. sodium and fluorine
Explanation:
Which of the following substances are soluble in water? Select all that apply.
a. NaCl
b. AgCl
c. AgNO3
d. KNO3
A, C and D are soluble in water.
What is solubility?Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
Salt (sodium chloride) is made from positive sodium ions bonded to negative chloride ions. Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.
AgCl is also not soluble in water because the forces favouring the formation of silver hydroxide (AgOH) are too weak to break the ionic bonds between silver and chlorine in AgCl. That means a bond between silver cation and the chloride ion is strong.
Silver nitrate is highly soluble in water but is poorly soluble in most organic solvents, except acetonitrile. It readily dissolves in water due to its strong ionic properties.
Potassium nitrate ([tex]KNO_3[/tex]) crystals were insoluble in water at room temperature. Heating the solution increases the solubility of the crystals in water.
Hence, A, C and D are soluble in water.
Learn more about solubility here:
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Sedimentary rock often contains
"strata". What are strata?
A. Large chunks
B. Noticeable layers
C. Grains of sand compacted together
D. Rocks from cooling magma
Answer:
Explanation:
Sedimentary rocks are formed from sediment grains deposited by water, wind or ice. They are always formed in layers, called “beds” or “strata”, and quite often contain fossils.
Help, please!! If an object with a mass of 4.2 kg accelerates at 2.6 m/s2, what was the force exerted?
a.4.2n
b.10.92n
c.10.92kg
d.20n
The compound XCI is classified as ionic if X represents the element:
1.
H
2.
1
3.
Rb
4.
Br
Answer:Rb
Explanation:
The compound XCI is classified as ionic if X represents the element Rb (Rubidium). Therefore, option 3 is correct.
What do you mean by ionic bond ?The term ionic bond is defined as the bond is formed when electrons are completely transferred from one element to another. One element in this bonding is always a metal, and the other is always a non-metal.
Chlorine is a group 17 and third period element. Chlorine has an atomic number of 17 and the element symbol is Cl.
The electronic configuration of the element chlorine is as follows :
1s₂,2s₂,2p₆,3s₂,3p₅.
Therefore, chlorine need one electron to become stable and form an ionic bond. Also, the ionic compound has the formula XCl which means that the valency of X is +1.
Thus, The compound XCI is classified as ionic if X represents the element Rb, option 3 is correct.
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greater than
equal to
products
right
Answer:
.
Explanation:
Which of the following statements regarding physical and chemical changes is true?
Write a causal question based on the information in the passage
Answer:
Casual is like hello sup dude
Explanation:
A tank of oxygen has a volume of 40.0L and is held at a pressure of 159atm at 25∘C. What volume of O2 gas (in liters) would there be at normal body conditions, or 1.00atm and 37∘C?
Answer:
V2 = 6616 L
Explanation:
From the question;
Initial volume = 40L
Initial Pressure, P1 = 159atm
Initial Temperature T1 = 25 + 273 = 298K (Upon converting to Kelvin unit)
Final Volume, V2 = ?
Final Pressure, P2 = 1 atm
Final Temperature T2 = 37 + 273= 310K (Upon converting to Kelvin unit)
These quantities are related by the equation;
P1V1 / T1 = P2V2 / T2
V2 = T2 * P1 * V1 / T1 * P2
V2 = 310 * 159 * 40 / (298 * 1)
V2 = 6616 L
I NEED HELP QUICK PLEASE
Which of the following describes a likely energy transformation for a computer monitor?
potential energy to mechanical energy
light energy to electrical energy
electrical energy to sound energy
chemical energy to kinetic energy
electrical energy to sound energy i think but im not sure
Why have scientists reasoned that Earth's outer core is liquid?
Because it is extremely hot.
Consider the equation below
plz help don't just give answer explain so i can understand
The equilibrium constant : Kc=[CO₂]
Further explanationThe equilibrium constant is the value of the product in the equilibrium state of the substance in the right (product) divided by the substance in the left (reactant) with the exponents of each reaction coefficient
The equilibrium constant is based on the concentration (Kc) in a reaction
pA + qB -----> mC + nD
[tex]\large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}[/tex]
Solid (s) and liquid (l) are not included in the calculation of Kc(only aq-aquoeus and g-gas)
From reaction
CaCO₃(s)⇔CaO(s)+CO₂(g)
Because CaCO₃ and CaO are solid, only CO₂ is included in the calculation
[tex]\tt Kc=[CO_2][/tex]
1. What does the 1.00794 stand for?
1.
H
Hydrogen
1.00794?
Answer:
It stans for atomic mass
A signal is sent from a nerve cell to a muscle cell.
What is this an example of?
A:Meiosis
B:Cellular respiration
B:intracellular communication
D:intercellular communication
PLEASE HELP
Answer:
D:intercellular communication
Explanation:
Cellular respiration and meiosis have nothing to due with communication between cells. Intracellular communication is communication within the cell, leaving intercellular communication left as the correct answer.
Why are ethics important when considering experiments?
A. A general sense of ethics ensures that everyone is aware of what's
right and what's wrong.
B. The scientific results would not be believable if they were obtained
unethically
C. Scientists would not be able to get funding if their experiments
were not ethical
D. It is important that people are not harmed for the sake of science,
Answer:
C. is the correct answer
Explanation:
I took the test
A teacher wrote the following part of a balanced chemical equation Cu+2AgNO3
Answer: Cu + 2AgNO3 -> 2Ag + Cu(NO₃)₂
Explanation: Assuming the teacher wants you to finish the other side of the balanced equation, here is how I would do it.
I would consider this a Single Replacement equation. This means Ag will be Replaced with Cu. Using the chart provided, it can be seen that (NO₃) has a charge of ⁻ ¹ . Therefore, it can be assumed that Ag as a ⁺¹ charge as well. However, copper has a charge of ⁺² (we know this because there are 2NO3 in the first equation and therefore there needs to be 2 when copper replaces it) so when replacing Ag with Cu, some butterfly subscript multiplication needs to happen like the picture attached. So, finally, the equation is:
Cu + 2AgNO3 -> 2Ag + Cu(NO₃)₂
what are true about bonds
Answer:
a.
Explanation:
What do oxygen, silicon, and selenium have in common? How might this relate to their organization on the periodic table?
Answer:
They all belong to the p block in the periodic table
Explanation:
Let us examine the electronic configuration of each element;
Oxygen - [He] 2s2 2p4
Silicon - [Ne] 3s2 3p2
Selenium - [Ar] 4s2 3d10 4p4
A common thread that joins all the elements listed above is that they all belong to the p-block in the periodic table. They could be collectively referred to as p-block elements.
How is electromagnetic spectrum ( wavelength & frequency) used to make calls on our cellphones?
Answer:
Cell phones use radio waves to communicate with cell towers, and these waves have wavelengths of approximately 10-1000 m, which are much too large to be ionizing. WiFi actually operates at quite precise frequencies, either 2.4 GHz or 5 GHz, which correspond to wavelengths of either 12 cm or 6 cm.
Explanation:
When the mobile phone is turned on, it emits radio waves that consist of radio frequency (RF) energy—a form of electromagnetic radiation moving at the speed of light. It works by transmitting radio wave signals to (and receiving these from) nearby base stations.