Which is the best description of a change in society that has resulted from advances in understanding the causes of diseases?

Answers

Answer 1

Answer: The best answer to the question stated above is letter B.
Improved methods of sanitation best describes the change in society that has resulted from advances in understanding the causes of diseases.

Choices to this question are:
A. An increased number of hospitals
B. improved methods of sanitation
C. improved use of microscopes
D. increased wages for healthcare workers.

Answer 2

Answer: The correct answer is B. improved methods of sanitation on e2020.

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What is the relationship between a revolution and an orbit?

Answers

Both are in motion, however the Earth rotates on its axis while it Revolves around the Sun.

"Rotation" refers to an object's spinning motion about its own axis. "Revolution" refers the object's orbital motion around another object. For example, Earth rotates on its own axis, producing the 24-hour day. Earth revolves about the Sun, producing the 365-day year.

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.

A ____________ reaction occurs when a substance is broken down into two or more simpler substances in a chemical reaction.

Answers

Answer: Decomposition

Explanation:

A chemical break down of a reactant into two or more products is known as Decomposition reaction. A substance decomposes to simpler substances.

It can be represented as:

AB → A + B

Example, water breaks down into oxygen and hydrogen

2 H₂O → 2 H₂ + O₂

Thus, the correct answer is:

A Decomposition reaction occurs when a substance is broken down into two or more simpler substances in a chemical reaction.

The reaction is called decomposition reaction in which substance(reactant) breaks down into 2 or more substances (products).

If a black hole is truly black and has an escape velocity greater than the speed of light such that no light can escape it, where do the X-rays come from in the black hole candidates so far identified?

Answers

Explanation:

The X- rays are not emitted by the black hole itself but by the from hot gas orbiting around the black hole forming a disc known as accretion disk. When a black hole rips apart a star it attracts gases towards it. The pressure that is generated in the gas heats it up to millions of degrees thus emitting radiation among which x rays are also present which are detected by radio telescopes on the earth.

What does the doppler effect indicate about the motion of galaxies?

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When galaxies move farther away the wavelength of the light is longer causing the galaxy to shift red but if it moves closer, the wavelength of the light gets smaller causing the galaxy to blue shift. The reason that the wavelength increases or decrease is due to the doppler effect.

Why do the densities of most substances decrease with an increase in temperature?

Answers

because density is related to activity of particles, the higher the activity level (the faster they're moving, and distance between them) the less dense they are. for example, H2O in a solid the particles are close together with minimum movement and it exists as ice, but when heat is applied the particles become more active and move more decreasing the density becoming liquid water, then when excessive heat is applied the same occurs and it becomes gas steam

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