Air containing 0.06% carbon dioxide is pumped into a room whose volume is 12,000 ft^3. the air is pumped in at a rate of 3,000 ft^3/min, and the circulated air is then pumped out at the same rate. if there is an initial concentration of 0.3% carbon dioxide, determine the subsequent amount a(t), in ft3, in the room at time t.

Give an example in which the electrical energy changes to light energy

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina.with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)

Where should a carbon monoxide detector be mounted?