Mrs. Knight drops her briefcase. When the briefcase lands on the floor, what is the reaction force to the action force of the briefcase on the floor? Select one:

the attraction of Earth for the briefcase

the force of air on the sides of the briefcase

the force of the floor on the briefcase the force of friction between

the briefcase and the floor

This is what a calorimeter is used for simpler ex, to measure calories in food.

From negative to negative

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