Physics, 14.10.2019 21:40 nmoareah

Historical models of the solar system included a blank model or earth-centered universe and a blank model or sun-centered universe.

1.geocentric
2.heliocentric
3.nebular

Answers: 3

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Answer from: kennyjortiz

Geocentric for the Earth centered one

Heliocentric for the Sun centered one

Answer from: terrysizemore666

For "Earth-centered" it was " Geocentric Theory proposed by greeks under the guidance of Ptolemy and "Sun-centered" was Heliocentric theory proposed by Nicolas Copernicus in 16th century A.D.

In short, Your Answers are: 1st blank - Geo-Centric Theory
2nd blank - Heliocentric Theory

Hope this helps!

Answer from: Quest

An atom (ours, not carroll's) consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6 nm. * if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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