Recent content by jacyh

  1. J

    Graduate What are the recent breakthroughs?

    What are the recent breakthroughs in physics in the fields of theoretical mechanics, optics & photics, meterials sciences, quantum mechanis, elecromagnetics, and statistical mechanis? :smile:
  2. J

    Kinematics of thrown chalk - find time to hit the floor

    Using only one equation of motion, how will you solve this: Suppose a the tteacher's hand is 1m from the floor, and the teacher flicked a chalk upwards at 2m/s. How long will it take for the chalk to reach the floor? I can't seem to use only one equation, it's always two equations or three...
  3. J

    Why is the distance always greater than or equal to the displacement?

    distance can be equal to the displacement (if you travel in a straight line), but it can never be less. I know, but... why? Haha.
  4. J

    Why is the distance always greater than or equal to the displacement?

    Why is the distance never less than the displacement? I can't seem to find a scientific explanation for it. :confused: