Aparticle with positive charge q = 3.20 10-19 c moves with a velocity v with arrow = (2î + 3ĵ − k) m/s through a region where both a uniform magnetic field and a uniform electric field exist. (a) calculate the total force on the moving particle (in unit-vector notation), taking b with arrow = (2î + 4ĵ + k) t and e with arrow = (4î − ĵ − 2k) v/m. (b) what angle does the force vector make with the positive x axis?

In 1859, charles darwin published the first edition of on the origin of species, which explained his observations of various groups of animals that showed great similarities but minor differences. darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. this idea predicted many future biological findings and became the basis of modern biology. darwin’s explanation for why different species exist is best described as a(n) law. theory. inquiry. hypothesis.