Recent content by Kat3rina

  1. K

    Comp Sci Java NullPointerException in class using HashMap

    Your advice was really helpful! Thank you so much!
  2. K

    Comp Sci Java NullPointerException in class using HashMap

    1.Homework Statement + Homework Equations Hello, I really need your help, because I'm a Java newbie and I've got stuck in this Java homework. I should implement class ObjectCounter, which has to include two methods: // increase the counter for given object public void add(Object o) //...
  3. K

    Ball Motion Down the Incline: Is the Calculated Height Correct?

    Thank you very much for your help! Do you think the last y statement is wrong? I get it from the previous statements this way: x = v_0 cos \beta \cdot t t = \frac {x}{v_0 cos \beta} y = - \frac {1}{2}g t^2 + v_0 sin \beta \cdot t y = - \frac {1}{2}g (\frac {x}{v_0 cos \beta})^2 + v_0...
  4. K

    Ball Motion Down the Incline: Is the Calculated Height Correct?

    Hi. I have problem with my homework. I have already searched related theoretic basis and I have already tried to solve it too, but I need some feedback, if my solution is right. I would like to ask you for it. Thank you very much. Homework Statement http://katus.kabel1.cz/homework.jpg The...
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