Which outcome does the big crunch scenario predict? A.
the matter in the universe will slow the expansion to the point where it would finally come to a halt and then start to retract
B.
the universe will keep expanding and growing ever larger and galaxies will grow farther apart
C.
the universe will finally extinguish itself with a violent expansion similar to the one with which it began
D.
the gravity in the universe will grow very weak, resulting in the planets drifting into stars

What is the major limitation to the light microscope?

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.)

Acar jack with a mechanical advantage of 6 needs to produce an output force of 600 n to raise a car. what input force is required? 6 n 100 n 600 n 3,600 n