This is the area where Earth's magnetic field is the strongest. *
1 point
A. The Grand Canyon
B. The equator
C. North & South Poles

If the current in a wire is directed downward, what is the direction of the magnetic field produced by the current? *
A. in the same direction as the current
B. clockwise in the horizontal plane
C. counterclockwise in the horizontal plane

How do step-up transformers work? *
A. They increase the voltage and the current for a home.
B. They decrease the voltage before it leaves a power plant.
C. They increase the voltage for efficient long-distance transmission.

DOES ANYONE HAVE THE ANSWERS TO THE TEST IN CONNECTIONS

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.