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mixas84 [53]
2 years ago
5

who brought astronomy out of the dark ages by declaring: "finally we shall place the sun himself at the center of the universe.

all this is suggested by the systematic procession of events and the harmony of the whole universe, if only we face the facts, as they say, 'with both eyes open?'"
Physics
1 answer:
solong [7]2 years ago
6 0

Nicolaus Copernicus was the one who brought astronomy out of the dark ages.

In one of his books "On the Revolutions of the Heavenly Bodies", he published the renowned line which declares his theory.

Nicolaus Copernicus, A polish astronomer put forward the theory that the is th Sun one that rests in the middle or center of the Universe and the planet Earth revolves around it on its axis every day.which was considered to be called the Heliocentric system.

To know more about the Heliocentric system refer to the link brainly.com/question/3491738?referrer=searchResults.

To know about Sir Nicolaus Copernicus' work refer to the link brainly.com/question/6699117?referrer=searchResults.

#SPJ4

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I what is the resistance of
Lynna [10]
The resistance of a conductor is given by:
R= \frac{\rho L}{A}
where
\rho is the resistivity of the material
L is the length of the conductor
A is its cross-sectional area

We can use this formula to solve both parts of the problem.

a) The length of the copper wire is L=1.0 m. Its diameter is d=0.50 mm, so its radius is 
r= \frac{d}{2}=0.25 mm=0.25 \cdot 10^{-3} m
And its cross-sectional area is
A=\pi r^2 = \pi (0.25 \cdot 10^{-3}m)^2 = 1.96 \cdot 10^{-7} m^2
The copper resistivity is \rho=1.68 \cdot 10^{-8} \Omega m, therefore the resistance of this piece of wire is
R= \frac{\rho L}{A}= \frac{(1.68 \cdot 10^{-8} \Omega m)(1.0 m)}{1.96 \cdot 10^{-7} m^2}=  8.57 \cdot 10^{-2} \Omega

b) The length of this piece of iron is L=10 cm=0.10 m. Its cross-sectional size is L=1.0 mm=0.001 m, so its cross-sectional area is
A=L^2 = (0.001 m)^2 =1 \cdot 10^{-6}m^2
The iron resistivity is \rho = 9.71 \cdot 10^{-8} \Omega m, therefore the resistance of this piece of wire is
R= \frac{\rho L}{A}= \frac{(9.71 \cdot 10^{-8} \Omega m)(0.10 m)}{1.0 \cdot 10^{-6} m^2}=9.71 \cdot 10^{-3} \Omega

3 0
3 years ago
What equation would you use to find the time taken for an object to travel a set distance?
3241004551 [841]

<em>Time = (the set distance) / (the object's traveling speed)</em>

6 0
3 years ago
When two point charges are a distance dd part, the electric force that each one feels from the other has magnitude F.F . In orde
Harman [31]

Answer:

In order to make this force twice as strong, F' = 2 F, the distance would have to be changed to half i.e. r' = r/2.

Explanation :

The electric force between two point charges is directly proportional to the product of charges and inversely proportional to the square of the distance between charges. It is given by :

F=\dfrac{kq_1q_2}{r^2}

r is the separation between charges  

F\propto \dfrac{1}{r^2}

r=\sqrt{\dfrac{1}{F}}

If F'= 2F

r'=\dfrac{1}{\sqrt{2F} }

In order to make this force twice as strong, F' = 2 F, the distance would have to be changed to half i.e. r'=\dfrac{1}{\sqrt{2F} }. Hence, this is the required solution.                                                                                    

6 0
3 years ago
What type of machine is used to measure the location of an earthquake epicenter.
Ber [7]

Answer:

Seismometer

Explanation:

Seismometer measures Earth quake epicenter while seismograph measures Earth quake size

8 0
2 years ago
1. Why should you use scientific notation when writing big numbers?
Fynjy0 [20]

Answer:

It helps the answer look clean. It also makes the work easier to work with.

Explanation:

Instead of writing a lot of zeros, all you have to do is add exponents to the number to show how much the decimal moved.

6 0
3 years ago
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