An insulated rigid tank with a volume of 0.57 m3, contains 4 kg of Argon gas at 450 kPa and 30 C. A valve is now opened, and the Argon is slowly allowed to escape until the pressure inside drops to 200 kPa. Assuming the Argon remaining inside the tank has undergone a reversible, adiabatic process, determine the final mass in the tank,

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

Answerapplying a direct current to a non magnetic material in order to create a electromagnetic field; plz check first good luck;