Which type of force can act through empty space? a. tension b. normal c. spring d. magnetism

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

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?