Mary is trying to determine the charge of an object in the lab. she observes that it is repelled by a positively charged rod. what can you say about the charge of the object? . a. the object id positively chargered b. the object is negatively charged c. the object has no change or d. the object has the equal number of positive and negative charges

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.

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island