What is most likely the reason the author included the description of the spoon in the hot coffee cup? A. To indicate that heat transfer always requires a liquid and a solid to work together

B. To explain the process of heat transfer by conduction through an everyday situation

C. To provide advice about using conduction to quickly cool down a hot beverage

D. To compare the effectiveness of heat transfer in liquid with heat transfer in air

a 2,000 calorie based diet.

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.

because if the tool that you are using is not balanced it there would be false mass.