Two rooms, each a cube 4.0m per side, share a 14-cm-thick brick wall. Because of a number of 100-W lightbulbs in one room, the air is at 31 Degrees C, while in the other room it is at 11 degrees C. How many of the 100-W bulbs are needed to maintain the temperature difference across the wall?

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

35.98  million  mile my friend

Answer: 1.4 seconds which is the third optionexplanation: current is defined as the flow of charge per timetherefore, the equation that relates current, charge and time can be expressed as follows: i = δq / δtwhere: i is the current given = 1.8 ampereδq is the charge given = 2.5 coulombδt is the time required for the flow of the given charges to give the 1.8 ampere.substitute with the givens in the above equation to get the time as follows: 1.8 = 2.5 / δtδt = 2.5 / 1.8 = 1.38888 which is approximately 1.4 secondshope this was !