What happens to the potential energy of a book that is dropped from a desk to the floor?

A.
It gains mass.

B.
It stays the same.


C. It increases as the book falls.

D.
It is converted into kinetic energy.

Answers

Answer 1

Answer:

D.   It is converted into kinetic energy.

Explanation:

When a book is dropped from a desk to the floor, the potential energy of the book is converted to kinetic energy as it falls.

Potential energy of a body is the energy due to the position of the body. At a particular height, the potential energy is maximum. A body with mass and moving with velocity will have kinetic energyAs the book drops through the height, to conserve energy, the potential energy is converted to kinetic energy.

Related Questions

why is the sky orange and red at sunset

Answers

At sunset the light from the sun grazes across the surface of the earth, passing through a long column or pathlength of atmosphere. During its passage through the atmosphere the blue components of the light are reduced in intensity, making the transmitted beam of sunlight more yellow or even red in color.

hope this helps ^^

Answer:

Here ya go ;)

Small particles of dust and pollution in the air can contribute to (and sometimes even enhance) these colors, but the primary cause of a blue sky and orange/red sunsets or sunrises is scattering by the gas molecules that make up our atmosphere. ... In this way, clouds act as a screen on which nature's colors are painted.

Please write down the definitions of elements, compounds, mixtures, homogenous mixtures, and heterogenous mixtures.

Answers


A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture.

A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
If it is pure, the substance is either an element or a compound. If a substance can be separated into its elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or a homogeneous mixture. If its composition is uniform throughout, it is a homogeneous mixture

Explain why air is a good conductor of heat

Answers

Answer:

Hope it helps!

Explanation:

Air molecules are too far to disperse heat energy to one another efficiently. Heat is conducted by molecules and atoms that are very closely bonded together and vibrating at high frequency.

to multiply food with the help of a simple machine​

Answers

Answer:

Explanation:

Inclined Plane: Easy Lifting. An inclined plane is simply an even, sloping surface. ...

Wedge: Splitting and Separating. ...

Screw: Fastening and Moving. ...

Lever: Multiplying Force. ...

Wheel and Axle: Rolling. ...

Pulley: Hoisting Heavy Loads. ...

Scissors: Making the Cut. ...

Hand Truck: Mover's Friend.

!!29 POINTS!! PLS HELP ASAP
In the process of creating ammonia (NH3), nitrogen gas (N2 ) is combined with hydrogen gas (H2) that is extracted from hydrocarbons such as methane (CH4) or propane (C3H8) gas. Manufacturers must determine the appropriate amount of each reactant so as to produce the highest yield of product.
The balanced reaction for ammonia is below:
N2+2H3→2NH3

Explain why determining the limiting reactant is important to a manufacturer trying to produce NH3 and the effect of running out of reactant.

Answers

Answer:

The person who just wanted points is annoying

Explanation:

WHY WOULD YOU DO THAT

Tightly packed molecules that vibrate in place describe a
O solid
O liquid
gas

Answers

It is a solid.This is because only a sold vibrates in place.

How do you decide which conversion factor to use?

Answers

Answer:

When a conversion is necessary, the appropriate conversion factor to an equal value must be used. For example, to convert inches to feet, the appropriate conversion value is 12 inches equal 1 foot. To convert minutes to hours, the appropriate conversion value is 60 minutes equal 1 hour

Explanation:

hope this helps have a good night/day :) ❤

which isotope of hydrogen is unstable

Answers

Answer:

Hydrogen has three naturally occurring isotopes: 1H (protium), 2H (deuterium), and 3H (tritium). Other highly unstable nuclei (4H to 7H) have been synthesized in the laboratory, but do not occur in nature. The most stable radioisotope of hydrogen is tritium, with a half-life of 12.32 years.

Explanation:

i really hope i helped ya out! good luck!

Hydrogen ions _____.

are hydrogen atoms which have lost protons
are released by bases
have positive charges
have negative charges

Answers

are hydrogen atoms which have lost protons

The first option is the correct one

The law of conservation of matter states that matter is neither created nor destroyed in a chemical reaction. Which of the following must be true? *
A the mass of the products is greater than the mass of the reactants
B the mass of the products is less than the mass of the reactants
C the mass of the reactants must equal the mass of the products​

Answers

Answer:

A

Explanation:

how does the process of photothinthsis compare to the process of cellular respiration ​

Answers

Cellular respiration uses glucose and oxygen to produce carbon dioxide and water, while the process of photosynthesis is used by plants and other photosynthetic organisms to produce energy.

what is meant by the following terms:
1.rearing.
2.shearing.
3.sericulture​

Answers

1) The process of keeping, feeding, taking care etc... of useful animals.

2)To cut wool off a sheep or another animal

3)The production of silk and rearing of silk worms for this purpose

The Meaning :-

1. Rearing Is The Process Of Keeping, Feeding, Breeding, And Medical Care Of Useful Animals.

2. Shearing Is The Process Of Removing The Fleece Of Sheep, Along With A Layer Of Skin By A Large Razor, Clipper Or A Shearing Machine.

3. Sericulture Is The Rearing Of Silkworms On A Commercial Scale.

help plzzzzzzzzzzzzzzz

Answers

Answer:

Blue is the metal Metals react by losing electrons from the outermost shell, which means their outermost electrons and now closer to the nucleus (one shell lower) and thus they get smaller when you go from metal atom to metal ion.

Explanation:

Which property of metals makes them good conductors of heat

Answers

Answer:

the molecules are tightly bound together, making it easy for electric currents to jump from one molecule to the next.

Explanation:

Answer:

They are good conductors of thermal energy because their delocalised electrons transfer energy.  The close packing of the metal ions in the lattice. the delocalised electrons can carry kinetic energy through the lattice.

Explanation:

HELP ME PLEASE: The image at the left shows three stars in the constellation Orion: Betelgeuse (A), Mintaka (B), and Rigel (C). How do the appearances of stars A, B, and C compare?

Answers

Answer:

B and C look blue therefore they are hot but A and C look big

The appearance of the three stars is compared by their colors and sizes.

In the image you can see the stars of the constellation Orion.

The star Betelgeuse (A) looks yellow and large (perhaps because of its closeness).The star Mintaka (B) is small (perhaps further away) and blue in color.The star Rigel (C) looks big and blue.

According to the above, it can be inferred that the three stars differ in their colors and sizes. Their colors can be determined by the chemical composition of them, while their sizes by the distance that separates them from the Earth, making the farthest ones look smaller and the closest ones, bigger.

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What would happen to the universe if the Law of
Conservation of Matter were not upheld? If it
wasn't actually a thing?

Answers

Things wouldn’t be in the shape that they are everything would be made of a strange substance or just not exist

18 gram of sucrose is dissolved in 180 gram of water. Calculate the number of oxygen atoms in the solution.​
answer: 6.684×10^24

Answers

We know, molecular mass of sucrose is 342 g/mol.

So, number of moles in 18 g is :

[tex]n_1 = \dfrac{342\ g/mol}{18\ g}\\\\n_1 = 0.053 \ moles[/tex]

Also, number of moles of water is :

[tex]n_2 = \dfrac{180}{18} \\\\n_2 = 10 \ moles[/tex]

We know, 1 mole of sucrose contain 11 moles of oxygen.

So,

[tex]n' = 0.053\times 11\\\\n'= 0.583\ moles[/tex]

1 mole of water contain 1 mole of oxygen .

So, moles of oxygen in water are :

[tex]n'' = 10\ moles[/tex]

Total number of moles, [tex]n' + n'' = 10.583 \ moles[/tex] .

Number of oxygen atoms are :

[tex]N = 6.022 \times 10^{23}\times 10.583\\\\N = 6.37 \times 10^{24}[/tex]

Hence, this is the required solution.

How does a thermometer measure temperature?

Answers

Sorry if this doesn’t help but here’s what I found:


A thermometer measures temperature through a glass tube sealed with mercury that expands or contracts as the temperature rises or falls. ... As temperatures rise, the mercury-filled bulb expands into the capillary tube. Its rate of expansion is calibrated on the glass scale.


The student carried out three titrations. The results are shown below (pic)
Use the student's concordant results (those within 0.10 cm of each other)
to work out the mean volume of sulfuric acid added.

Answers

Answer:

yes

Explanation:

For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?

reactants: 1; products: 1
reactants: 1; products: 2
reactants: 2; products: 1
reactants: 2; products: 2

Answers

Answer:

The balanced chemical reaction is written as follows:

bacl2 + na2so4 → baso4 + 2nacl

Therefore, the number of chlorine atoms in the reactants side and the products side would be 2 atoms in both sides which should be the case because the number of atoms in each side should have the same number.

Explanation:

Internet

Help me with this one please

Answers

Single replacement/displacement

Further explanation

Given

Type involves free element

Required

Type of reaction

Solution

Single replacement/displacement occurs when a more active element replaces another less active element in the compound to form a new compound

The activity of this element can be seen from the voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au  

The more to the left, the element is more reactive (easily release electrons) and the stronger reducing agent  

The general formula for single replacement :

A + BC ⇒ AC + B

From this general formula shows that there are 2 free elements on both sides (reactants and products)

A sample of water contains 5.24x10^22 molecules. How many moles are in this sample?

Answers

Answer:

0.087 moles of water

Explanation:

Given data:

Number of molecules of water = 5.24×10²² molecules

Number of moles of water = ?

Solution:

The given problem will solve by using Avogadro number.

1 mole = 6.022 × 10²³ molecules of water

5.24×10²² molecules × 1 mol / 6.022 × 10²³ molecules

0.87×10⁻¹ mol

0.087 mol

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

If two stars had equal absolute brightness, what else would most likely be equal?
O energy
O distance from Earth
O apparent magnitude
o chemical composition
help please time timed

Answers

Answer:

C - apparent magnitude

Explanation:

What is the main function of mitochondria?

Energy production
Energy production

Lipid production
Lipid production

DNA storage
DNA storage

Protein production
Protein production

Answers

im like 90% sure it’s energy

Which of the following is an example of a mixture?

A. Ca
B. CO2 + H2 + O2
C. NaCl
D. C6H12O6
The first one to help me will get the brainliest and 50 points UwU

Answers

Answer:

B is because their not combined

Answer:

tru it's B

Explanation:

give the person above me brainliest if u want

The isotope 38Sr 90 is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a 0.500-g sample diminishes to 0.393 g in 10.0 yrs. Calculate the half-life.

Answers

Answer:

Half-life = 28.8 years

Explanation:

The radioactive decay of an atom follows the equation:

Ln[A] = -kt + ln[A]₀

Where [A] is actual amount of isotope after time t; k is decay constant and [A]₀ initial amount of isotope

Solving for k:

Ln[0.393g] = -k*10yrs + ln[0.500]

-0.2408 = -k*10yrs

0.02408yrs⁻¹ = k

Half-life, is:

Half-life = ln 2 / k

Half-life = ln 2 / 0.02408yrs⁻¹

Half-life = 28.8 years

The isotope [tex]38Sr^{90}[/tex] is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a 0.500-g sample diminishes to 0.393 g in 10.0 yrs, the half-life is - 28.78

Formula:

radioactive decay follows first-order kinetics,  

k = [tex]\frac{1}{t}ln\frac{a}{x}[/tex]

Given:  

a = initial amount = 0.5 g  

x = amount of isomer after 10 years = 0.393 g  

t= time   = 10 years

Solution:  

k =  [tex]\frac{1}{10}ln\frac{0.5}{0.393}[/tex]

   = 0.02408  

k = [tex]\frac{0.693}{t/2}[/tex]  

T(1/2) = half-life time

= [tex]\frac{0.693}{k}[/tex]

=   [tex]\frac{0.693}{0.02408}[/tex]

= 28.78 years.

Thus, The isotope [tex]38Sr^{90}[/tex] is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a 0.500-g sample diminishes to 0.393 g in 10.0 yrs, the half-life is - 28.78

Learn more:

https://brainly.com/question/1160651

Ari dissolves 1 gram of sugar in 10 grams of water. What will be the mass of the dissolved sugar and water ? Explain your answer.

Answers

Answer:

the answer would be 11 grams of water/sugar water

Explanation: its that because 11 grams plus 1 gram = 11 grams

even though it may seem it may just go away that mass has to go somewhere it just doesn't vanish from the earth.

what does inductive effect mean?​

Answers

Answer:

Tbh I looked it up but here is what I found. I hope it helps

Explanation:

In chemistry, the inductive effect is an effect regarding the transmission of unequal sharing of the bonding electron through a chain of atoms in a molecule, leading to a permanent dipole in a bond.

Vaccination _____.

is always effective in preventing disease
provides passive immunity against disease
involves injecting the body with specific medication
should be given on a regular schedule from birth

Answers

Is always effective in preventing Disease
Answer:Real answer for this question; provides passive immunity against disease

(({Multiple choice for my review but NOT THE ANSWER FOR THIS QUESTION:

provides a type of adaptive immunity

injects a weakened or inactive form of a virus into the body

must be given on a regular basis from birth to 18 years of age.                

People with my review please note that it doesn't have to be given on a regular basis. I grew up just fine without one every so often.}))

HELP ASAP I WILL GIVE BRAINLIEST

Which gas property in the chart above is extensive and cannot be used to identify the gas?



Specific heat of 0.98 J/g·°C

Density is 0.5 g/mL

Volume of 12.7 mL

Boils at -223°C

Answers

Answer

Boils at -223 degree C

Explanation:

Because gas doesn't have any boiling points

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