Please please help :(

The acceleration of the car is equal to 3.33 m/s² with a velocity of 72 Km/hr.

Acceleration can be demonstrated as the rate of change of velocity over time. The acceleration can be explained as vector quantity due to both magnitude and direction. Acceleration is defined as the 2nd derivative of the position of the object w.r.t. time.

According to Newton's 2nd law of motion, the force exerted is equal to the mass times of acceleration of an object.

a = F/m

or, a = dv/dt

Given, the final velocity of the car, v = 72 Km/hr

v = 72 × 1000/3600 m/s

v = 20 m/s

The time is taken by car to travel, t = 20 s

The acceleration of the car, a = (20 - 0)/(6 - 0)

a =  3.33 m/s²

Therefore, the acceleration of the car is 3.33 m/s².

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Answer:

Formal

Explanation:

Answer:

I think its formal because the question looks a bit fancy by using all the present perfect tense..

hope this helped you

please mark as the brainliest ( if its correct)(ㆁωㆁ)

Answer:

picture?

Explanation:

Answer: 500

Explanation: there's 0.001L in every mL. Divide the mL

by 1000 or multiply the liter by 1000.

Answer:

negative

Explanation:

Any atom whose number electrons are more than the number of protons in it will have a negative charge. Since in this case the electrons are 10 and protons are 9 the 9+ charge protons and 9- charge electrons cancel each other giving a final charge of negative.

The charge of an ion with 9 protons and 10 electrons and neutrons is -1 as there is one more electron in comparison to number of protons .

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.They are attracted to opposite charges.

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Answer:

The given equation H2 + O2 => H2O is not balanced as the oxygen atom on the right side do not have the same number of atoms as of the left side.

In a balanced equation, the number of atoms on both sides are equal. So in this case, we are required to change the coefficient in front of H2O, in order to make oxygen atom balance, for that we need to change the coefficient of H2 as well.

It means to make the given equation balance we need to change the coefficient in front of H2 and H2O.

Balance equation: 2H2 + O2 => 2H2O

Answer:

The amount of positive charge in a barium nucleus is approximately 8.972 × 10⁻¹⁸ coulomb

Explanation:

The amount of positive charge there is in a barium nucleus is found as follows;

The atomic number of an element is equal to the number of proton present in the atom

The atomic number of barium = 56 = The number of protons in an atom of barium

The positive charge of a single proton is known as an elementary charge, e, given by the formula, e = F/N[tex]_A[/tex]

Where;

F = Faraday's constant

N[tex]_A[/tex] = The Avogadro's number

Therefore, e = 1.602 176 634 × 10⁻¹⁹ C

Which gives the positive charge, Q, of the protons of a barium nucleus as follows;

Q = Number of protons × e

Q = 1.602176634 × 10⁻¹⁹ × 56 ≈ 8.972 × 10⁻¹⁸ Coulomb  per atom of barium.

The amount of positive charge in a barium nucleus ≈ 8.972 × 10⁻¹⁸ coulomb.

Answer:

carbon

Explanation:

The element which has atomic mass of 106.42 is carbon as per the existing isotopes.

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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Answer:

The correct option is;

Bromine will gain 1 valence electron to become a negative ion

Explanation:

Bromine can be found in period 4 in group 17 of the periodic table and is an halogen

The electron configuration of bromine can be presented as follows;

Electronic configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁵

Therefore, an atom of bromine has 2 + 5 or 7 electrons in its outermost shell, which makes it have one less electron to complete a full octet structure and therefore, bromine has a strong affinity for electron to complete its octet structure and it is thus a strong oxidizing agent.

When bromine enters into a chemical reaction and gains the one valence electron it becomes a negatively charged ion.

Answer:

First, the lining may consist of loose, smaller bits of the same materials that have been incorporated into the latticework of the nest. These finer materials are utilized to shed water, deter pests, conceal the eggs from predators, insulate, and cushion them. ... They also serve to insulate and cushion the eggs.

Explanation:

contaminants from your community can flow through runoff into a river basin.

Contaminants from your community affect a river basin that is miles away could runoff can carry pollutants from your neighborhood into a river basin.

Community is defined as a social community that shares characteristics like geography, rules, beliefs, values, or identities.  Community is important because they are frequently a significant source of social connection and a sense of belonging, strong communities are essential. Living a fulfilling life requires being a part of a group of people who share similar attitudes, values, and aspirations.

Contaminants are defined as a substance that, whether unintentionally or on purpose introduced to air, water, soil, or food, becomes detrimental to humans or other living things on a biological, chemical, physical, or radiological level. Chemical, physical, and biological pollution are the three different types.

Thus, contaminants from your community affect a river basin that is miles away could runoff can carry pollutants from your neighborhood into a river basin.

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Answer:

matter is any substance that has mass and takes up space by having volume. ... 

Answer:

Explanation:

It is density.

I do hope I helped you! :)

Answer:

the answer is A. Magma is molten rock within the earth; Lava is molten rock on the earth's surface

Answer:

A Magma is molten rock within the earth

Explanaton:

Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density of liquid = 0.70 g/mL

volume = 130 mL

The mass is

mass = 0.7 × 130

We have the final answer as

Hope this helps you

Answer:

To summarize, potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.

Explanation:

I hope this helped

Answer:Proton, the gold foil experiment indicated that the nucleus has a positive charge.

60 J work does the student do on the bag.

The formula for work is as follows:-

[tex]W=F\times d[/tex]....(1)

Here, F is the force, and d is the distance moved in the direction of force.

Substitute 50 N for force and 1.2 m for distance in the equation (1) as follows:-

[tex]W=50\ N\times 1.2\ m\\\\=60\ Nm\\\\=60\ Joule[/tex]

Hence, the value of work is 60 J.

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Fe + O2 —(H2O)—> Fe2O3

Answer:

Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.

Explanation:

I'm not sure if this is correct but I hope this helps.

Answer:

I believe it is c

Explanation:

........................

From everyday life the following have been made possible by modern chemistry:

b. wearing a synthetic spandex athletic shirt

c. taking a pill to get relief from a cold

d. getting a boost of energy by eating an apple

Hence, use of spandex in athletics shirt, pill for overcoming cold and apple as source of energy are parts of modern chemistry.

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Answer:

250 cm³

Explanation:

V = l × w × h

V = (5) × (5) × (10)

V = 250 cm³

Answer:

The most accurate way to determine an object's volume, especially in the case of an irregularly shaped object, is to immerse it in water and measure the amount of water it displaces. A graduated cylinder large enough to hold both the object and enough water to fully immerse it is the best tool for this job.

Answer:

Density stays the same

Explanation:

The density remains the same because cutting the object in half will divide the mass & volume by the same amount. Also, the density of a substance remains the same no matter what size it is.

Answer:

The answer is B

Both are used for energy storage, but only carbohydrates are used for short-term energy storage.

Explanation:

hope it helps

got it right on edge

i just submitted it and got it right

Both are used for energy storage, but only carbohydrates are used for short-term energy storage.

MACROMOLECULES:

Therefore, both macromolecules are used for energy storage, but only carbohydrates are used for short-term energy storage.

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Answer:

Hypothesis. Hope this helped! :)

Given :

Half-life of Iodine , [tex]t_{0.5}=8 \ days[/tex] .

Initial concentration , [tex][A_o]=100\ mg[/tex] .

To Find :

The amount of sample remains after 32 days .

Solution :

Rate constant is given by :

[tex]k=\dfrac{0.693}{t_{0.5}}\\\\k=\dfrac{0.693}{8}\ s^{-1}\\\\k=0.086625\ s^{-1}[/tex]

Now , by rate law :

[tex][A]=[A_o]e^{-kt}[/tex]

Putting all given values, we get :

[tex][A]=100\times e^{-(0.086625)\times 32}\\[/tex]

[tex][A]=6.25\ mg[/tex]

Therefore , the remaining sample after 32 days is 6.25 mg .

Hence , this is the required solution .

Answer:

Transition metals and lanthanide metals

Explanation:

Alkali metals, alkaline earth metals, halogens, and noble gases are all part of the main group elements.

Periods and families simply refer to the rows and columns of the periodic table.  They don't specify the type of element.