At what distance (in between m1 and m2) from m1 should a third mass m3 = 4.5m1 be put such that the net force on m3 is zero? Give your answer in meters.

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Sound energy is produced when an object vibrates. examples are 1- a balloon popping2-a whistle3- a waterfall

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