A 600 mW laser beam is polarized vertically. It then passes through two polarizers. The axis of the first polarizer is oriented at 45 degrees from the horizontal, and that of the second is oriented at 20 degrees from the horizontal. What is the power of the transmitted beam in mW

I'm not sure what your asking buddy.. but i know that you can weld two peices of steel by pure force and pressure.

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.