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Kinetic energy is often referred to the energy of

Question 1 options:

A)work


B)mass


C)motion
D)force


)
Question 2 (1 point)
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Which example has the least kinetic energy

Question 2 options:

A)a 10 kg rock rolling down a hillside at 100 m/s.


B)a 100 kg rock rolling down a hillside at 100 m/s.


C)a 1 kg rock rolling down a hillside at 1 m/s.


D)a 100 kg rock rolling down a hillside at 1 m/s.

Question 3 (1 point)
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The law of conservation of energy states that

Question 3 options:

energy can be created but not destroyed.


energy can neither be created nor destroyed, only change forms.


energy can be destroyed but not created.


Question 3 (1 point)
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The law of conservation of energy states that

Question 3 options:

A energy can be created but not destroyed.


B energy can neither be created nor destroyed, only change forms.


C energy can be destroyed but not created.


D energy never changes

Which is an example of an object increasing its kinetic energy

Question 4 options:

A a train stopped at the station.


B an airplane after landing on a level runway.


C a mouse running faster after spotting a cat.


D a rocket before launch.

Question 5 (1 point)
Identify when an object has a kinetic energy of zero joules.

Question 5 options:

A when an object is no longer in motion.


B when the energy has been destroyed.


C just after a ball it leaves your hand pitching a ball.


D as a pendulum swings downward.

Which is NOT an example of kinetic energy

Question 6 options:

A an elevator moving up to the 3rd floor.


B a skateboard rolling down a hill.


C an arrow after it has hit the target and is at rest.


D a skydiver as they decrease speed after opening their parachute.

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.

Answer:

Casual is like hello sup dude

Explanation:

Answer:

a.

Explanation:

Answer:

stupid

13

Explanation:

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.

Answer:

NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)

Explanation:

Sodium hydroxide (NaOH) is a strong base and hydrochloric acid (HCl) is a strong acid. That means that they are totally dissociated into ions in aqueous solution.

When a solution of NaOH is mixed with a solution of HCl, a neutralization reaction occurs, in which a salt (NaCl) and water (H₂O) are formed.

The balanced molecular equation for this reaction is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)

Answer:

C. is the correct answer

Explanation:

I took the test

Because it is extremely hot.

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.

Answer:

2.7 g/cm³

Explanation:

Answer:

5000.9 mgl

Explanation:

bzbzbbxbdhuzuz

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.

Answer:

PCl5

Explanation:

1 Phosphorus (P)

5 Chlorine (Cl)

P1Cl5 =

PCl5

please mark brainliest

PCl(5)

Explanation:

P is phosphorous, chlorine is Cl

P(1atom) CL(5atoms)

We don't need to write the 1 atom for the P.

So PCl5

Make sure the 5 is the tiny lowercase.

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

The equilibrium constant : Kc=[CO₂]

The 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]

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.

Answer: Covalent bonds usually occur between nonmetals.  In Covalent bond elements share their electrons.

Answer:

Explanation:

Option D is the correct answer

Answer:

3d

Explanation:

answer D

Answer:

.

Explanation:

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.

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

A, C and D are soluble in water.

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.

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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.

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.

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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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.

Answer:

It stans for atomic mass

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