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  1. B

    Trouble w/ Vector Dot Product

    Homework Statement A cutting tool under microprocessor control has several forces acting on it. One force is \vec{F}=-αxy2\hat{j}, a force in the negative y-direction whose magnitude depends on the position of the tool. The constant is α=2.50 N/m3. Consider the displacement of the tool from...
  2. B

    Friction between two blocks on a table

    I have a question for two scenarios (see the diagram attached): 1) When the two blocks on the table are at rest, the static friction the table exerts on the bottom block is counteracting the tension in the rope, resulting in a net force of zero. Is there any static force being exerted by the...
  3. B

    Deriving the speed of a falling ball

    Homework Statement You drop a baseball from the roof of a tall building. As the ball falls, the air exerts a drag force proportional to the square of the ball's speed (f=Dv2). (a) In a diagram, show the direction of motion and indicate, with the aid of vectors, all the forces acting on the...