Atrain is heading due west from st. louis. at noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. 1 hour later the train had traveled 1 mile and is going 80 miles per hour, while the plane traveled 5 miles and is going 500 miles per hour. at 1pm how fast is the distance between the train and plane increasing?

Rohit is trying to tune an instrument

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of 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.)