Tim, Elena, Anne, and Jared are playing tug of war. Tim and Elena are on one team and Anne and Jared are on another team. Each team is pulling in opposite directions. Tim is pulling with a force of 50 N and Elena is
pulling with a force of 70 N. On the opposite side of the rope, Anne is pulling with a force of 40 N. How much
force does Jared need to apply in order to keep the rope in equilibrium?

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.)