A particle like ball is connected to one end of a light inextensible cord, other end of which is connected to a very thin frictionless fixed vertical rod. The entire length of the cord is wound around the rod into a large number of closely spaced turns and the ball is held touching the rod. When the ball is released, the cord gradually unwinds and the ball startscircling the rod. What angle does the cord make while it is unwinding the rod

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)