A 15.0 m uniform ladder weighing 500 n rests against a frictionless wall. the stair forms an angle of 60.0 ° with the horizontal. (a) find the horizontal and vertical forces exerted by the ground on the base of the ladder when an 800 n firefighter is 4.00 m from the bottom. (b) if the ladder is about to slip when the firefighter is 9.00 m above, what is the coefficient of static friction between the ladder and the ground?

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.

Hen a gfci receptacle device is installed on a 20-ampere branch circuit (12 awg copper), what is the minimum volume allowance (in cubic inches) required for conductor fill for each conductor in the outlet box?

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.