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Unformatted text preview: 23 . To convert to ergs the number is multiplied by the number of joules in a cal, 4.18, and the number of ergs in a joule, 10 7 . Key to energy problem: Energy is conserved, so the sum of the kinetic energy plus the potential energy is constant. Since there is no velocity of any particle in A the kinetic energy is zero. The amount of potential energy is (5 x6)/3 + (6 x 7)/4 +(7 x 5)/3. The total energy of B must equal this number because of conservation of energy. The potential energy of B is: (5 x 7)/10 + (7 x 6)/15 + (5 x 6)/20. Since energy of A = energy of B, The potential energy of A minus the potential energy of B = the kinetic energy of B, that is potential energy(A) + kinetic energy of A = potential energy of B + kinetic energy of B....
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- Fall '08