For what reason in copernican system not entirely correct? a. copernicus placed the earth in the center of his system. b. copernicus described the orbits of the planet's as circular. c. copernicus placed the sun at the center of the universe. d. copernicus claimed the earth rotated around the sun but the other planets rotated around the earth.

The answer is B. he thought that the planets moved in perfect circles, rather than ellipses :)

B. Copernicus described the orbits of the planet's as circular.

Explanation:

Copernican model was a sun-centric model which is also known as heliocentric model. In this model, sun is at the center of the solar system and all the planets including Earth revolve about it in circular orbits.

According to Kepler's laws of planetary motion, the orbits are not actually circular but elliptical with Sun at one of its focus.

Thus, option B is correct.

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2