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3 years ago

Which of these models of the solar system first proved that the sun is at the center of the solar system?

Physics

2 answers:

soldi70 [24.7K]3 years ago

6 0

Answer:

Copernicus' heliocentric model

Explanation:

Nicolaus Copernicus was the first one to give the heliocentric model of the solar system. The heliocentric model of the solar system describes the sun to be at the center of the solar system and earth and other planets with their moons revolving about it in concentric orbits.

Kepler believed in Copernicus's heliocentric model but gave laws of planetary motion that described the orbit of the planets to be elliptical instead of circular.

Tycho Brahe view of the solar system was that sun revolved around earth but other planets revolved around the sun.

Ptolemy's geocentric model considered earth to be the center of the universe and sun and other planets revolving about it.

Anarel [89]3 years ago

4 0

I believe it was Copernicus' heliocentric model.

heliocentric - the sun is at the center and the planets revolve around it.

hope this helps :)

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A wave travels at 13 m/s and the crests are 6 meters apart. How many waves would you see pass you by per second? (round up to th

MrRa [10]

Answer:Number of waves =2.2

Explanation:

The frequency of A wave is defined as the number of waves moving a fixed point per second which is given as

f= $\frac{N}{t}$

F= Frequency

N= number of waves

t= time

We first find the frequency

Given velocity of the wave, v = 13m/s

and wavelength, λ as 6meters(distance between two consecutive crest)

, we fiind the frequency using

v= f λ

frequency = v / λ

= (13m/s ) / 6

=2.16s-1

f = $\frac{N}{t}$

2.16s₋¹= $\frac{N}{1s}$

Therefore N, Number of waves = 2.16 waves rounded up to 2.2 waves

3 0

3 years ago

Calculate the formal charge on the indicated atom in each of the following molecules or ions. Some molecules may have more than

Arte-miy333 [17]

Answer:

Formal charge for the first resonance structure of NO₂; first Oxygen = 0, N = +1, second Oxygen = -1

Formal charge for the second resonance structure of NO₂; first Oxygen = -1, N = +1, second Oxygen = 0

Explanation:

The formal charge of an atom in a molecule is the assumed charge the atom would have if the electrons in the bonds are redistributed evenly between the atoms.

Formal charge = valence electrons - (non-bonding electrons) - (bonding electrons / 2).

For NO₂ molecule, the formal charges for the atoms are as follows;

First Oxygen atom = 6 - 4 - 4/2 = 0

For Nitrogen = 5 - 1 - 6/2 = +1

For the second Oxygen atom = 6 - 6 - 2/2 = -1.

Overall charge = 0 + (+1) + (-1) = 0

For the second resonance structure,

First Oxygen atom = 6 - 6 - 2/2 = -1

For Nitrogen = 5 - 1 - 6/2 = +1

For the second Oxygen atom = 6 - 4 - 4/2 = 0

Overall charge = (-1) + (+1) + (0) = 0

Note: Where resonance structures for atoms or ions exist, the formal charges of each of the respective atoms or ions are calculated according.

8 0

3 years ago

Read 2 more answers

A + 32.2 μC charge feels a 0.544 N force from a + 12.3p μC charge. How far apart are they? (u stands for micro.) [?] m

love history [14]

Answer:

r = 2.55 m

Explanation:

Given that,

First charge, q₁ = 32.2 μC

Second charge, q₂ = + 12.3 μC

The force between charges, F = 0.544 N

We need to find the distance between charges. The force between two charges is given by the formula as follows :

$F=k\dfrac{q_1q_2}{r^2}\\\\r=\sqrt{\dfrac{kq_1q_2}{F}} \\\\r=\sqrt{\dfrac{9\times 10^9\times 32.2\times 10^{-6}\times 12.3\times 10^{-6}}{0.544}} \\\\r=2.55\ m$

So, the charges are 2.55 m apart.

5 0

3 years ago

You drive a car for 2.0 h at 60 km/h, then for another 3.0 h at 85 km/h. What is your average velocity

Anon25 [30]

Answer:

Explanation:

Average velocity is found in the total displacement experienced in the trip divided by the total time it took to make this trip. If, for the first 2.0 hours, the car travels at 60 km/hr, then in 2.0 hours the car can travel 120 km; if it then travels for 3.0 at 85 km/hr, it can travel 255 km in the same direction. The total time this took was 5.0 hours. So doing the math and rounding correctly by following the rules for the adding and subtracting of sig fig's:

$v=\frac{120+255}{5.0}=\frac{380}{5.0}=76\frac{km}{hr}$

If you do not round when you add, the average velocity is 75 km/hr

8 0

3 years ago

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N76 [4]

I think it is D. Brownies are harder to bake than cupcakes. an example of an objective statement is why a company is hiring for that certain job. let me know if this is correct!
Hope this helped

5 0

3 years ago

Read 2 more answers