If an element has a mass number of 200 and an atomic number of 80, how many neutrons does the element have? A. 80
B. 280
C. 120
D. 200

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.

What is friction? how does it affect the motion of an object?

Newtons view of arrangement of the universe