Can you guys help me please!!!!

as it breaks down the surface , it reshapes it

A force that resists motion when objects touch is friction. Frictional force is the force that prevents an object from moving.

The term friction is defined as the force that opposes the motion of a solid object over another. There are four types of friction that are static friction, sliding friction, rolling friction, and fluid friction.

Three factors in particular determine the frictional force between two bodies: The adhesion between body surfaces, the surface roughness, and the deformation of bodies are all factors.

Frictional force is the force that prevents an object from moving. The imperfections on the two surfaces in contact are what produce friction. The type of surfaces in contact affects friction.

Thus, A force that resists motion when objects touch is friction.

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Answer: both

Explanation:

For Number 2)

THE ELEMENTS TEND TO FORM COMPOUNDS BECAUSE AOMS ARE UNSTABLE AND CAN SHARE ELECTRONS IN THIER OUTER ENERGY LEVELS .

AS WE KNOW, ATOMS OF AN ELEMENT BECOMES MORE STABLE BY LOSING , GAINING AND SHARING ELECTRONS.

Elements react with each other to complete their octet or duplet so as to become stavle in nature. For e.g. Carbon reacts with oxygen to form carbon dioxide. Carbon reacts with four molecules of hydrogen to form methane - CH4.

Answer: Only the nervous and endocrine systems are involved in maintaining homeostasis.

Explanation: Hope this helped you

D. Only the nervous and endocrine systems are involved in maintaining homeostasis.

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Answer:

[tex]3.5[/tex] pill need to taken for completing dosage of [tex]875[/tex] mg

Explanation:

Total dosage of medicine to be taken in a day

[tex]= 2 * 875 \\= 1750[/tex]mg

Total weight of one pill [tex]= 250[/tex] mg

Number of pills required is equal to total dosage of medicine divided by the weight of one pill.

Hence,

Number of pills

[tex]= \frac{875}{250} \\= \frac{175}{50} \\= \frac{35}{10} \\= 3.5[/tex]

Answer:

The percent yield for ethanol in this process is 95.2%

Explanation:

Yield is the ratio between the amount of product actually obtained in the reaction and the maximum amount of product that could have been obtained if the reagents had been completely consumed.

The theoretical yield is the yield is the maximum you can get in a reaction.

On the other hand, the actual performance shows what you really get in experimentation. It is generally less than the theoretical yield.

So, the percentage return is the actual return times the theoretical return multiplied by 100.

So, in this case the percentage yield will be calculated as:

[tex]percent yield=\frac{4,760 kg}{5,000 kg} *100[/tex]

percent yield=  95.2%

The percent yield for ethanol in this process is 95.2%

Answer:

Explanation:

.

Answer:

[tex]1.936\times 10^{-18}\ \text{J}[/tex]

Explanation:

[tex]R_h[/tex] = Rydberg constant = [tex]2.178\times 10^{-18}\ \text{J}[/tex]

[tex]n_i[/tex] = Initial shell = 3

[tex]n_f[/tex] = Final shell = 1

We have the relation

[tex]\Delta E=R_h(\dfrac{1}{n_f^2}-\dfrac{1}{n_i^2})\\\Rightarrow \Delta E=2.178\times 10^{-18}(\dfrac{1}{1^2}-\dfrac{1}{3^2})\\\Rightarrow \Delta E=1.936\times 10^{-18}\ \text{J}[/tex]

The energy of the photon emitted here is [tex]1.936\times 10^{-18}\ \text{J}[/tex].

Answer:

C. Ionic-Li and S are two nonmetals

Answer:

Mass = 96g

Explanation:

Molarity = number of moles/volume of solvent

According to the provided information, volume = 1.55L, Molarity = 1.55M

number of moles (n) = molarity × volume

n = 1.55 × 1.55

n = 2.4025

n = 2.40mol

For NaOH, molar mass = 23 + 16 + 1 = 40g/mol

mole = mass/molar mass

Mass = molar mass × mole

Mass = 40 × 2.40

Mass = 96g

Answer:

The IUPAC name of CH3 – CH2 – CH2 – CH=CH2 is Pent-1-ene.

Answer:

the bell is longitudinal

the secound one is transverse

third is longitudinal

the fourth is transverse

Explanation:

i got it right on my mastery test

The average speed : 3.07 m/s

Given

d1 = 2 km

t1 = 9 min

d2 = 1.5 km

t2 = 10 min

Required

The average speed

Solution

Average speed = total distance : total time

total distance :

= d1+d2

= 2+1.5

=3.5 km

total time :

= t1+t2

= 9 min + 10 min

= 19 min

Average speed :

= 3.5 km : 19 min

= 0.184 km/min

= 3.07 m/s

Answer:

1.evaperation

2.condenstation

3.precipatation

Explanation:

So I guess condenstation leads to precipatation-

Answer:

Evaporation is when water/liquids changes state from a liquid to a gas. Which eventually with enough water water vapor (which is what forms when water evaporates), it turns into clouds. But when the clouds get too heavy and full of water. Rain/precipitation falls from those clouds.

-Hope this helps!

Explanation:

Answer:

2 curies

Explanation:

This is actually pretty easy to explain.

The Radium-226 which is an isotope of the radium, have an activity of curie. This is basically used in radioactivity of certain elements.

As in both cases we have Radium -226 and we are only varying the mass of the Radium, then, we can just do a rule of 3 to calculate this:

1 g Ra-226 --------> 1 Curie

2 g Ra-226 -------->  X Curie

Solving for X:

X = 2 g * 1 Curie / 1 g

You can also see this by taking 2 grams of Ra per separate. On one side you have 1 g of Ra-226 and on the other side, you have another 1 g of Ra-226. Both have 1 Cury of activity. If you put both on the same side, you will have 1 Cury of 1 isotope plus 1 cury of the other isotope, final result? 2 curies.

Hope this helps

Answer:

Decomposition

Explanation:

This shows a compound splitting into two

By definition, PbSO₄ → PbSO₃ + O₂ is a decomposition reaction, because a single substance decomposes producing two different substances.

First, you have to know that in a decomposition reaction, a single substance decomposes, producing two or more different substances. That is, in this type of reaction, two or more substances are formed from a compound.

The atoms that make up a compound are separated to give the products according to the formula:

AB → A + B

This type of reaction can occur spontaneously or caused by certain external factors, such as heat, which promote the decomposition of the molecule into simpler substances.

In this case, it is possible to observe that PbSO₄ → PbSO₃ + O₂ is a decomposition reaction, because a single substance decomposes producing two different substances.

Learn more:

Answer:

it is synthesis reaction

Answer:

B. New Moon!

Explanation:

New Moons are commonly seen as nearly or completely dark, this is because the rays of the sun completely overshadow the moon's "light," therefore making it appear dark.

Answer: self-actualization (C)

Explanation:

it’s at the top of the hierarchy of needs.

1. In preparing his speech for a youth association, Eric considers the demographics and other important information about the people who will be listening to him speak. Like all successful speakers, Eric is engaging in the process of

C. Analyzing the audience

2. To gather formal information about audience members' attitudes, beliefs, and values, you can

D. ask open-ended and closed ended question on a survey

3. Debbie planned a speech calling for higher student fees. She thought about how her audience might react to this message. She prepared a survey and asked a group of her classmates to take it. What kind of audience analysis did Debbie use?

C. Formal

4. Why is audience analysis important?

A. It helps you understand the audience as much as possible before giving your speech

5. The audience's educational level is a factor related to

B. demographics

6. A speaker that collects information about the audience, evaluates what has been collected, and adapts his or her speech using that information is considered a(n) _____ speaker

B. Audience-centered

7. Maslow refers to the stage where one reaches his or her full developmental potential as

C. self-actualization

8. Which of the following is a method of collecting informal data about your audience?
D. observing the audience

9. Sara is preparing a speech to endorse a political candidate. She uses the information she gathered about her audience to determine their vales, beliefs, and attitudes so she can better prepare her speech. Sara is conducting which type of analysis?

A. Psychographic analysis

10. As you learn more about the audience, you are able to identify the beliefs, values, and attitudes of the audience. This is known as

B. Psychographics

I hope this helps!

Answer:

The answer for 10 times 20 is 200

Explanation:

Why... Because what is 1 times 2=2 so add the left over zero I'm that your answer!

Answer:

Metal is a better conductor than plastic so its going to absorb any cooler temperatures while the plastic stays the same.

Explanation:

Answer:

A

Explanation:

Answer:

Deciliter = 0.1 L

Explanation:

The options are unit of volume. In order to determine which is greatest, all the options would be converted to liter.

Microliter = 1e-6 L

Mililiter = 0.001 L

Deciliter = 0.1 L

Centiliter = 0.01 L

Among all the options; Deciliter = 0.1 L is the greatest.