I PARTE. Suma y resta de Vectores conociendo sus expresiones analíticas. 1. Sean los vectores siguientes:

A = −5i − 3j + k
B = −3i − j − 2k

Hallar:
a. A + B;
b. A – B;
c. Un vector unitario en la dirección de A + B;
d. La dirección de A – B.

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

In a hydrogen molecule there are a total of four charges, 2 protons in the two nuclei, and 2 electrons. how many unique charge-pairs are there (without double counting)?

Newtons view of arrangement of the universe. don't copy from anywhere.