A15,000-kg train car moving due east at 23 m/s collides with and couples to a 10,000-kg train car that is initially at rest. find the common velocity of the two-car train after the collision. (east is defined as positive. indicate the direction with the sign of your answer.)

Which of the following statements is true about women and minorities in early psychology? a. in the early 20th century, numerous graduate schools recruited women and minorities to study psychology. b. opportunities in higher education were limited for women and minorities in the early 20th century due to discrimination. c. despite some obstacles, there were numerous employment opportunities for women and minorities. d. women and minorities were often selected to do academic research in an effort to make the field more diverse.

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

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)?