Sixty-three joules of heat are added to a closed system. the initial internal energy of the system is 58 j, and the final internal energy is 93 j. how much work is being done by the system?

28J
I just got this right.

Answer;

= 28 joules

Explanation;Work done in a system is positive when the system does work on the surroundings and the energy leaves the system. If work is done on the system, energy is added to the system, then the work is negative.

Initial internal energy of system = 58 Joules

Final internal energy in the system = 93 Joules

Energy added = 63 Joules

Work done in the system = (58 J + 63 j) - 93 j

                                           = 28 Joules

Iwould say a is accurate

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current