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  • error: module not found: javafx.controls  1 error?

    j'utilise jGrasp et tout un coup je me met a avoir cette erreur: error: module not found: javafx.controls 

    1 error

    2 réponsesFutilitésil y a 1 an

  • Java avant minuit svp?

       private ArrayList<ArrayList<CellStatus>> layout; 

    j'essai de crée un array list mais sa me donne une erreur :

    error: cannot find symbol 

    4 réponsesProgrammationil y a 2 ans

  • Help physic gravitational (exam tomorrow)?

    A binary star system has two stars of equal mass mstar, separated by a distance r. A comet of mass mcomet is very far away essentially at rest. Slowly, gravity pulls the comet towards the stars along a trajectory that passes through the midpoint between the two stars

    question 1:a) Draw a free body diagram for the comet when it passes through the midpoint and find the net force acting on the comet at that point.

    Question 2: Find the potential energy of the comet at the midpoint between the stars

    Question 2 Find the potential energy of the comet at the midpoint between the stars

    Question 3: Find the velocity of the comet when it passes through the midpoint between the two star

    Those were what I try:

    question 1: I put two opposite arrow (Fg) and said that the total net force is zero

    question 2: Ug=-4Gm(start)m(comet)/r

    question 3: v= sqrt(Gm(star))*2

    my exam is tmr and my professor have not post the answer! help please

    1 réponsePhysicsil y a 2 ans