What net force would be required to accelerate the 82-kg Stapp at 450m/s/s

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Which two particles are found in the center of an atom

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.