Consider n moles of ideal gas, with constant volume specific heat cv, undergoing a cyclic process as follows: (i) initial state is po, vo, to; (ii) expansion to 2vo at constant pressure; (ii) isothermal expansion from 2vo to 4vo; (iv) constant pressure compression returns temperature to to; (v) isothermal compression, returning to initial state, po, vo. (a) find p, v, and t at the endpoints of these processes. (b) find au of the gas for the complete cycle. (c) find the work done on the gas, and the heat flow, in each process. (d) this cycle is a heat engine. the efficiency is defined as the net work done by the gas (sum of all 4 processes), divided by the total qin, where the latter quantity only includes those processes where the heatflow direction is into the gas. find the efficiency.

What is the role of the ocular lens?

Write a hypothesis about the effect of increasing resistance on the current in the circuit. use theformat and be sure to answer the lesson question. “how do changes in voltage or resistance affect current in an electric circuit? ”

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.)