The image below shows a loop of wire passing through a magnetic field at constant speed. Which of the following statements best describes the current in the wire as the wire passes through the field?

A. The current remains constant and in the same direction as the wire loop moves across the magnetic field.
B. The current steadily increases as the loop approaches the midpoint directly above the magnet, and then decreases steadily as the loop continues.
C. The current decreases to zero as the loop approaches the midpoint, and then changes direction and increases as the loop continues past the midpoint.
D. There is no current in the loop as the loop crosses the magnetic field at a steady speed.

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

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.