Using the stress strain relations you developed in part: 1. derive the theoretical torque versus angle of twist relationship for the cast iron and for the steel. a. for every angle of twist recorded in the lab, determine which part of the shaft cross section is in the linear elastic range, which part is in perfectly plastic range (if any) and which part is in strain hardening (if any). b. given the shearing stress-strain models you developed, derive the equations for the torque for each of the parts identified above.

the answer is c.)

explanation:

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.