PHYSICS HIGH SCHOOL

Which of the following is a consequence of using fossil fuels as an energy source?A. decreased carbon dioxide levels
B. increased biodiversity
C. increased acid rain
D. decreased ecosystem disruption

Answers

Answer 1
Answer:

Answer:

c

Explanation:

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Which of the following does not represent a mechanical wave?sound
waves in the ocean
waves in a wheat field
light

Answers

The example that does not represent a mechanical wave is light. A mechanical wave requires a medium in order for it to travel and propagate. Examples of such is sound waves that travel through the air or ocean. Light is an electromagnetic wave because it makes use of particles called photons to propagate.

Which of the following does not represent a mechanical wave?

light

You are worried that a solid substance has dissolved in a beaker of water in a lab. What would be a way to separate the substance from the water?A. Boil the water away, leaving the substance behind in the beaker.
B. Pass the solution through a filter to let the dissolved substance separate.
C. Use a magnet to draw out the solid substance from the water.
D. Pour the liquid along a rough surface that would catch the solid particles but not the water.

Answers

Boiling the water away, leaving the substance behind in the beaker is the way to separate the mixture. The correct option is A.

What is a mixture?

A mixture is basically a substances comprised of two or many distinct chemical substances which are indeed not linked covalently.

A mixture is the usually physicalcombination of two or more substances that retain their identities as well as are mixed in the way to form solutions, suspensions, along with colloids.

When two or more distinct substances are physically combined, a mixture is formed that can be distinguished back into its original substances.

When two or more substances combine to form a new substance that cannot be separated back into its original substances, a chemical reaction occurs.

The mixture can be separated by boiling the water away and leaving the substance in the beaker.

Thus, the correct option is A.

For more details regarding mixture, visit:

brainly.com/question/24898889

#SPJ2

Answer:

I think the answer is a because boiling water cleans it

The mass of the sun is 1.99×1030kg and its distance to the Earth is 1.50×1011m. What is the gravitational force of the sun on the earth?

Answers

In order to calculate the gravitational force of the two bodies we use the formula which is expressed as:

F = GMm/R²

where G = 6.67 x 10^-11 in SI unit, M and m are the mass of the two bodies and R is the distance between them. 

F = 6.67 x 10^-11 (1.99×10^30) (6×10^24) / (1.50×10^11)²
F = 3.53×10^22N

The gravitational force of attraction acting on the earth due to sun is \boxed{3.539*{{10}^(22)}\,{\text{N}}}  or  \boxed{3.54*{{10}^(22)}\,{\text{N}}}  .

Further Explanation:

The Newton’s law of Gravitation states that the gravitational force of attraction acting between two bodies is directly proportional to the product of the mass of the two bodies and inversely proportional to the square of the distance between the two bodies.

Given:

The mass of the sun is  1.99*{10^(30)}\,{\text{kg}} .

The distance between the Earth and the sun is  1.50*{10^(11)}\,{\text{m}} .

Concept:

The gravitational force of attraction between the two bodies can be represented mathematically as:

F=\frac{{G{M_1}{M_2}}}{{{r^2}}}

Here, F  is the gravitational force of attraction, G  is the gravitational constant, {M_1}  is the mass of the first body, {M_2}  is the mass of the second body and r  is the distance between them.

Since the two bodies are Sun and the Earth so the masses of the two are considered.

The mass of the Earth is 6* {10^(24)}\,{\text{kg}}  and the value of Gravitational constant is  6.67*{10^( - 11)}\,{{{\text{N}}\cdot{{\text{m}}^{\text{2}}}}\mathord{\left/{\vphantom{{{\text{N}}\cdot{{\text{m}}^{\text{2}}}}{{\text{k}}{{\text{g}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace} {{\text{k}}{{\text{g}}^{\text{2}}}}} .

Substitute  6.67*{10^( - 11)}\,{{{\text{N}}\cdot{{\text{m}}^{\text{2}}}}\mathord{\left/{\vphantom{{{\text{N}}\cdot{{\text{m}}^{\text{2}}}}{{\text{k}}{{\text{g}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace} {{\text{k}}{{\text{g}}^{\text{2}}}}}  for  G , 1.99*{10^(30)}\,{\text{kg}} for {M_1}  , 6* {10^(24)}\,{\text{kg}} for  {M_2}  and  1.50*{10^(11)}\,{\text{m}} for  r  in above equation.

\begin{aligned}F&=\frac{{\left({6.67*{{10}^(-11)}\,}\right)*\left({1.99*{{10}^(30)}\,{\text{kg}}}\right)*\left({6*{{10}^(24)}\,{\text{kg}}}\right)}}{{{{\left({1.50*{{10}^(11)}\,{\text{m}}}\right)}^2}}}\n&=\frac{{7.964*{{10}^(44)}}}{{2.25*{{10}^(22)}}}\n&=3.539*{10^(22)}\,{\text{N}}\n\end{aligned}

Therefore, the gravitational force of attraction acting on the earth due to sun is \boxed{3.539*{{10}^(22)}\,{\text{N}}}  or  \boxed{3.54* {{10}^(22)}\,{\text{N}}} .

Learn More:

1. Calculate the total force on the earth due to Venus, Jupiter and Saturn brainly.com/question/2887352

2. A rocket being thrust upward as the force of the fuel being burned pushes downward brainly.com/question/11411375

3. A 50-kg meteorite moving at 1000 m/s strikes earth. Assume the velocity is along the line brainly.com/question/6536722

Answer details:

Grade: High school

Subject: Physics

Chapter: Newton’s law of Gravitation

Keywords:

Gravitational force, attraction, newton’s law, earth, sun, mass of the sun, distance, 1.99*10^30 kg, 1.50*10^11 m, 6.67x10^-11, gravitational constant.

Which initial quantity is the same for all three cannonballs? Option 1: Mass Option 2: Volume Option 3: Density Option 4: Velocity

Answers

Answer:

Velocity:  At rest they all have zero velocity.

Explanation:

Is there more information (e.g., mass, volume, etc.) for the cannonballs?

Assuming they are at rest, their velocity is the same:  0

A 20600 kg sailboat experiences an eastward force 17700 N due to the tide pushing its hullwhile the wind pushes the sails with a force of 60000 N directed toward the northwest (45◦ westward of North or 45◦ northward of West). What is the magnitude of the resultant acceleration of the sailboat?

Answers

Answer:

2.23 m/s²

Explanation:

mass of sail boat, m = 20600 kg

Force along east, F1 = 17700 N

Force along north west, F2 = 60000 N

write the forces in vector form

\overrightarrow{F_(1)}=17700 \widehat{i}

\overrightarrow{F_(2)}=60000\left ( - Cos45 \widehat{i}+Sin45\widehat{j}\right )

\overrightarrow{F_(2)}=-42426.41\widehat{i}+42426.41\widehat{j}

Net force acting on the boat

\overrightarrow{F}=\overrightarrow{F_(1)}+\overrightarrow{F_(2)}

\overrightarrow{F}=17573.6\widehat{i}+42426.41\widehat{j}

The magnitude of net force is given by

F=\sqrt{17573.6^(2)+42426.41^(2)}

F = 45922 N

Acceleration = force / mass

a = 45922 / 20600

a = 2.23 m/s²

Using the periodic table and your knowledge of atomic structure. cobalt (Co) and nickel (Ni) have almost identical atomic mass numbers. Comparing nickel and cobalt from the periodic table, which statement best describes the atoms?A. Nickel has one more neutron.


B. Both atoms will have the same number of protons.


C. Both atoms will have the same number of neutrons.


D. Cobalt has one less proton.

Answers

Answer:

Cobalt has one less proton.

Explanation:

Nickel and Cobalt both has almost same atomic mass number approximately 59 but has different atomic number.

Number of proton and electrons in an atom is given by,

Number of proton = Number of electron = atomic number of an atom.

Number of neutron in an atom is given by,

Number of neutrons = Atomic mass number - atomic number

Case 1: Cobalt

Atomic mass number = 59

Atomic number = 27

Number of proton and electrons in Nickel is given by,

Number of proton = Number of electron = atomic number of an atom.

Number of proton = 27

Number of proton = 27

Number of neutron in an atom is given by,

Number of neutrons = Atomic mass number - atomic number

Number of neutrons = 59 - 27

Number of neutrons = 32

Case 2: Nickel

Atomic mass number = 59

Atomic number = 28

Number of proton and electrons in Nickel is given by,

Number of proton = Number of electron = atomic number of an atom.

Number of proton = 28

Number of neutron in an atom is given by,

Number of neutrons = Atomic mass number - atomic number

Number of neutrons = 59 - 28

Number of neutrons = 31

Cobalt has one less proton.

Thus, Option D is correct.

Answer: The correct answer is option D.

Explanation:

Cobalt and Nickel both are transition metals which means that their last electron enter d-orbitals.

These two elements have similar atomic masses but differ in the atomic number.

Atomic number is equal to the number of protons or electrons present in that element.

Atomic number = number of protons =  number of electrons

Atomic Mass is the sum of protons and neutrons in an element

Atomic mass = Number of protons + Number of neutrons

  • For Cobalt:

Atomic Number = 27

Number of protons = 27

Atomic mass = 59

Number of neutrons = 59 - 27 = 32

Hence, Number of protons in this element is 27 and number of neutrons are 32.

  • For Nickel:

Atomic Number = 28

Number of protons = 28

Atomic mass = 59

Number of neutrons = 59 - 28 = 31

Hence, Number of protons in this element is 28 and number of neutrons are 31.

  • From the above information, it is visible that cobalt has one less proton that the nickel.

Hence, the correct answer is option D.
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