Hi need help with this problem: a closed system consist of 4 objects. initially,

Question

Hi need help with this problem: a closed system consist of 4 objects. initially, object A has107 J of energy, object B has 117 J of energy, object C has 166 Jof energy and object D has 160 J of energy. after 99 s have pass,object A has 72 J of energy, object B has 49 J of energy and objectC has 112 J of energy. How much energy does D has? Pls Help Hi need help with this problem: a closed system consist of 4 objects. initially, object A has107 J of energy, object B has 117 J of energy, object C has 166 Jof energy and object D has 160 J of energy. after 99 s have pass,object A has 72 J of energy, object B has 49 J of energy and objectC has 112 J of energy. How much energy does D has? Pls Help

Explanation / Answer

        Given that thesystem is closed then the total energy constant .     Initial energies are A1 = 107J ,B1 = 117J ,C1 = 166J , D1 = 160J    final energies are    A2 =72J, B2 = 49J , C2 = 112J , D2 = ?    since the system is closed then                     Totalinitial energy = Total final energy                     A1+B1 +C1+D1 = A2 +B2 +C2+D2                                          D2 = A1 +B1 +C1+D1 - A2 -B2 -C2                                                = ------------ J     

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