collsion detection

Are you primarily concerned with your character (the player) being able to jump on the rectangle that is rotating? And, can your character be idealized as a point, e.g., a point that jumps on the rotating rectangle? (Of course when you draw the character it will be more than a point...maybe triangles or a sprite image...but from a physics point of view, maybe your character is very simple?)

If your character can be idealized as a point, then at a given frame you could consider your character's motion path during that frame to be just a line segment with a starting point at the character's location at the beginning of the frame, and an ending point at the character's unconstrained location at the end of the frame. Check and see if that segment intersects the rectangle...at its instantaneous orientation at the beginning of the frame. If the character line segment intersects, then move the character onto the rectangle.

To actually account for the rotating motion of the rectangle during the frame is trickier to understand and implement. So that is why I am suggesting you do something simple...consider the rectangle to be at a fixed orientation for the duration of the frame, at least for now until your game is more feature complete. You would only update the rectangle's orientation at the end of each frame.

once i programmed a game like that. just check that out: http://www.pygame.org/project-Balancer-689-.html