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.

truck y has a greater velocity than truck x.

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.