. A stone weighing 20N is put in a cylinder of water. When the stone was
suspended in water the reading on the spring balance was 16 N.
2. Differentiate between gravitational and elastic potential energy
3. . Describe u the use of metals and non metals

Answer:

Mass and weight are often used interchangeably in everyday conversation. For example, our medical records often show our weight in kilograms but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of Earth on an object. It depends on the distance from the center of Earth. Unlike weight, mass does not vary with location. The mass of an object is the same on Earth, in orbit, or on the surface of the Moon.

Units of Force

The equation  

F

net

=

m

a

is used to define net force in terms of mass, length, and time. As explained earlier, the SI unit of force is the newton. Since  

F

net

=

m

a

,

1

N

=

1

kg

⋅

m/s

2

.

Although almost the entire world uses the newton for the unit of force, in the United States, the most familiar unit of force is the pound (lb), where 1 N = 0.225 lb. Thus, a 225-lb person weighs 1000 N.

Weight and Gravitational Force

When an object is dropped, it accelerates toward the center of Earth. Newton’s second law says that a net force on an object is responsible for its acceleration. If air resistance is negligible, the net force on a falling object is the gravitational force, commonly called its weight  

→

w

, or its force due to gravity acting on an object of mass m. Weight can be denoted as a vector because it has a direction; down is, by definition, the direction of gravity, and hence, weight is a downward force. The magnitude of weight is denoted as w. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. Using Galileo’s result and Newton’s second law, we can derive an equation for weight.

Consider an object with mass m falling toward Earth. It experiences only the downward force of gravity, which is the weight  

→

w

. Newton’s second law says that the magnitude of the net external force on an object is  

→

F

net

=

m

→

a

.

We know that the acceleration of an object due to gravity is  

→

g

,

or  

→

a

=

→

g

. Substituting these into Newton’s second law gives us the following equations.

Weight

The gravitational force on a mass is its weight. We can write this in vector form, where  

→

w

is weight and m is mass, as

→

w

=

m

→

g

.

In scalar form, we can write

w

=

m

g

.

Since  

g

=

9.80

m/s

2

on Earth, the weight of a 1.00-kg object on Earth is 9.80 N:

w

=

m

g

=

(

1.00

kg

)

(

9.80

m/s

2

)

=

9.80

N

.

When the net external force on an object is its weight, we say that it is in free fall, that is, the only force acting on the object is gravity. However, when objects on Earth fall downward, they are never truly in free fall because there is always some upward resistance force from the air acting on the object.

Acceleration due to gravity g varies slightly over the surface of Earth, so the weight of an object depends on its location and is not an intrinsic property of the object. Weight varies dramatically if we leave Earth’s surface. On the Moon, for example, acceleration due to gravity is only  

1.67

m/s

2

. A 1.0-kg mass thus has a weight of 9.8 N on Earth and only about 1.7 N on the Moon.

The broadest definition of weight in this sense is that the weight of an object is the gravitational force on it from the nearest large body, such as Earth, the Moon, or the Sun. This is the most common and useful definition of weight in physics. It differs dramatically, however, from the definition of weight used by NASA and the popular media in relation to space travel and exploration. When they speak of “weightlessness” and “microgravity,” they are referring to the phenomenon we call “free fall” in physics. We use the preceding definition of weight, force  

→

w

due to gravity acting on an object of mass m, and we make careful distinctions between free fall and actual weightlessness.

Be aware that weight and mass are different physical quantities, although they are closely related. Mass is an intrinsic property of an object: It is a quantity of matter. The quantity or amount of matter of an object is determined by the numbers of atoms and molecules of various types it contains. Because these numbers do not vary, in Newtonian physics, mass does not vary; therefore, its response to an applied force does not vary. In contrast, weight is the gravitational force acting on an object, so it does vary depending on gravity. For example, a person closer to the center of Earth, at a low elevation such as New Orleans, weighs slightly more than a person who is located in the higher elevation of Denver, even though they may have the same mass.

It is tempting to equate mass to weight, because most of our examples take place on Earth, where the weight of an object varies only a little with the location of the object. In addition, it is difficult to count and identify all of the atoms and molecules in an object, so mass is rarely determined in this manner. If we consider situations in which  

→

g

is a constant on Earth, we see that weight  

→

w

is directly proportional to mass m, since  

→

w

=

m

→

g

,

Question 5 of 10
What does it mean to "get to know" a narrator?
A. To analyze the challenges of using this particular narrator
B. To determine whether the writer chose an appropriate narrator
C. To come to understand the narrator's perspective on the world
D. To identify whether the narrator is first, second, or third person

Which sentence best summarizes the author's bias?

MAYDAY MAYDAY WEEEWOOWEEEWOO
Subtract a number from -2 so that the difference is equal to: the numerical reciprocal of -2

will give brainliest to correct answer :)

write 5 sentences with comparative form

Identify the transitional word/s or phrase/s in the following sentence/s. Identify the type of transition.
In later years, the association grew and became more persistent, demanding answers from the government as to where their missing children were. After the military gave up its authority to a civilian government in 1983, the Mothers of the Plaza de Mayo have pressed the new government to help find answers to the kidnappings that took place in the Dirty War years.

Identify something that happens that represents a force for chaos/savagery. in chapter 6 in the lord of the flies

Help please !??!??!??!?????!!?

if this passage were located in a magazine on page 33, which sentence cites the passage correctly? a) unlike other non-renewable energy sources, wind power does not pollute and will never be used up (yung). b) unlike other non-renewable energy sources, wind power does not pollute and will never be used up (page 33). c) unlike other non-renewable energy sources, wind power does not pollute and will never be used up (yung, page 33). d) unlike other non-renewable energy sources, wind power does not pollute and will never be used up even if people use that power every day. 2) which sentence would be the best thesis statement for a persuasive essay on school uniforms?

no link pls just the answer

Your friend is going on a school trip to another country and has never been away from home before. You went on the same school trip last year.

Write an email to your friend about the school trip.

In your email, you should:
- tell your friend about the place you visited
-give some advice about what to take
- say what you enjoyed about being away from home.

Please I would really appreciate it if you gave a good answer, I really need it. Thanking you in advance.

Antarctica is a cold and empty place without any towns. The icy land and weather can be very difficult. People who visit could get seriously hurt or get lost and starve. Government officials tell visitors about all the dangers. They make it clear that they will only help people who really need it. They ask visitors to be very careful.

Do It!

Officials _________ visitors.

Press enter to interact with the item, and press tab button or down arrow until reaching the Submit button once the item is selected
A celebrate
B unite
C warn
D encourage will give brainllents NO LINKS

Someone please help ASAP will mark you Brainliest. The “choose” one is ‘Nominate Candidate’ and ‘Infirm Citizens’ and ‘Create Balance’ and ‘Unite Government’ and ‘Influence Policy’.

PLESSSSSSSSSSSS HELPPPPPPPPP


Model

Complete each opinion in the first column by writing a persuasive word or phrase on the line. Then, match the facts and details in the second column that best support each claim with relevant information.


Opinion

Relevant Information

Leafy green vegetables are the _______most ______ healthy food.



Spinach provides us with vitamin K, vitamin A, calcium, and potassium.

The third book is the ____best book__________ in the series.



This book won three top honors for literature last year.

Purchasing my new tablet was _______was the best choice besides________ worth the expense.



The upgrades to this new model provide more data storage and faster download times than the older model.

It’s ______much_________ warmer this summer than last summer.



Records show that the temperature has increased by an average of 3 degrees each day.

This dishwasher is ___the most ___________ efficient appliance the company has produced.



The new model uses twice as much water.

My parents WAS/WERE at the supermarket this morning.

AYUDA

HELP ME PLEASE RN PLZ

Match each example to the correct story element. Plot, setting, conflict, character AND THEME.

1.) The prince realized that he shouldn’t have
trusted the evil fairy. Instead, he should
have learned to trust in himself to
overcome obstacles.

2.) Somehow, he needed to save his ducklings from
the wolf and find his way home before nightfall.
He’d have to figure out how to outsmart the wolf.

3.)The sheep had three little lambs, each of which she
loved dearly. She wasn’t the strongest sheep in the
herd, but she was determined to protect them.

4.)The story is about a young mermaid and her sister,
who find a mysterious cave and decide to explore it.
In the cave, they discover an evil witch, who poisons
the mermaid’s sister. The mermaid travels to find a
magical octopus, whose ink is a cure for the witch’s
poison. The mermaid returns with the ink and saves
her sister.

5.) A long time ago, there lived a shoemaker and his
wife. They had a small shop in the middle of the
village, where they would create the most beautiful
shoes for the king.

Can an 8th grader get held back

Is this poem a sonnet or not? Justify your answer.

2. How do you know that Albert Johnson and his crew were used to
being at sea during bad weather? Support your answer using the
RACE. strategy and only TWO PIECE of evidence from the text.

42. What logical fallacy do these sentences display? *
F. the incorrect assumption that most voters own property along the beach
G. the false premise that trespassing is illegal
H. the loaded term private to influence the reader
J. the caricatures of both property owners and trespassers

can somebody please go look at my previous math question, it's the fifth time I've posted it and I'm getting really frustrated. Can someone just please help me out​

the boy said to father I do not understand the poem change the following sentence into indirect​

Which statement best describes the effect of surrealist art and literature on its audience?
They both encourage readers to question what is real by taking them on a journey into the subconscious.
They both create a mysterious and shocking world full of familiar and unfamiliar magical elements.
They both defy readers' expectations, surprising and sometimes confusing readers or making them uncomfortable.
They both follow fulfill readers' expectations, creating a story that is predictable and ends happily.

Na sentença “Finding toilet paper during a pandemic can be a struggle” que aparece no vídeo utilizado na aula de hoje, a palavra STRUGGLE significa:
A. an easy situation
B. a comfortable situation
C. a difficult situation

If all cats are bats, and all bats are hats, are all cats hats?

what is simple present and present continuous?

can someone explain it to me?

ANSWER AND F R E E POINTS FORR PEOPLE WHO WANT IT!
















10!

What do you think the speaker means when he says, “Nature’s first green is gold”? in nothing gold can stayy

Write a thesis statement for your argument for genetically modified

the burning of paper is an example of reversible physical change true or false ​

After the U.S. Constitution was written, there was intense debate over whether it should be approved. During this time two groups formed around this debate. In 1788, a poster was hung up in New York City, which read "Ratification is a Vote for the Future." Which group most likely hung this poster?

What do you think the speaker means when he says, “Nature’s first green is gold”?