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kakasveta [241]
4 years ago
11

What are the historical solar system models. Differences

Physics
1 answer:
Rasek [7]4 years ago
7 0
Aristarchus(310-230 BC)
Aristarchus was a Greek Astronomer and Mathematician. He proposed the heliocentric model of the Solar System. He attempted to measure the distances from the moon to the sun.
Aristotle (334-322 BC)
<span>Aristotle was a Greek Philosopher. He was the first person to propose this historical model. He thought the Earth was in the center of all celestial beings. His idea was that the Earth was in the middle of the sun, moon, stars, and other planets. </span>
Ptolemy(100-170 CE)
<span>Ptolemy was a astronomer and a geographer and a mathematician! He proposed the geocentric model. He believed that a celestial body could go at a constant speed in a perfect circle. It was called the "wheels-on-wheels" system. It had better observations than the model that had came before his. His geocentric model was used for the next 14 centuries! </span>
Kepler(1571-1630)
<span>German astronomer and mathematician, Johannes Kepler, studied very hard and closely, and he found out that the planets did not fit the observations that were made by previous explorers. He found one that fit the best out of them all! He found three principles, called Kepler's Laws. </span>
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A force of 99 N causes a box to accelerate at a rate of 11 m/s2. What is the mass of the box? (Ignore frictional effects.)
lys-0071 [83]

We know, F = m.a

m = F/a

m = 99/11 = 9

So, The mass of the box is 9 Kg

5 0
4 years ago
One anthem of silicon can properly be combined in a compound with
Darya [45]
One atom of silicon can properly be combined in a compound withtwo atoms of oxygen to produce silicon dioxide because silicon is very similar to carbon, as it is in the same group as carbon is in, therefore, it is able to make four bonds.
Moreover, Silicon has 4 valence electrons. In order to form an ionic bond, silicon<span> would have to gain or lose 4 electrons.</span>
4 0
3 years ago
susan drops her camara in the river from a bridge that is 250 feet high. How long does it take the camara to fall 250 feet?
Pavlova-9 [17]

It takes around 4 seconds for the camera ro fall 250 feet

use the quadratic formula where a=-16 b=0 and c=250

6 0
3 years ago
You are designing a toaster heating element to consume 10A at 120V. The heating element will be made from a length of cylindrica
bulgar [2K]

Answer: a) 12 Ω; b)  15.10 m; c) 360 kJ

Explanation: In order to explain this problem we have to considere the OHM law which is given by:

V=R*I where R is the resistance and I the current, V is the voltage.

For the toaster heating the resistance must be equal

R=V/I=120/10= 12 Ω

We also know that R=ρ*L/A where L and A are the length and area of the wire.

Then the length of the wire is given by:

L=R*A/ρ= 12*π*(0.8*10^-3)^2/1.6*10^-6=15.10 m

Finally we can calculate the consumed energy  by the toaster heating during 5 minutes (5*60s=300 s).

The power is equal:

P=I*V= 10*120=1200 W

E= P*time (s)= 1200*300=360*10^3J

4 0
3 years ago
Read 2 more answers
Genes are organized on matching pairs of _______.
natta225 [31]

Answer:

homologous chromosomes

Explanation:

6 0
3 years ago
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