Astudent is experimenting with a battery, three identical light bulbs, and some wire. first, she creates a circuit with the light bulbs in series, and next, in parallel, and observes the brightnesses of the bulbs for each circuit. she decides to analyze the total power from the battery for both circuits, assuming that the battery emf is and the three bulbs each have constant resistance r. (for all symbolic answers, use the following as necessary: r and ℰ for .

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?