Concerning the planetary orbits, why was copernicus somewhat inaccurate?
a. he suggested the orbits were elliptical.
b. he suggested the orbits were circles.
c. he suggested the orbits were identical.
d. he suggested the orbits were equidistant.

Which articulations allow for greatest range of motion?

If a balloon is taken outside on a very cold day, what will occur?

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present