The electric potential at points in an xy plane is given by v = (4.0 v/m^2)x^2 − (2.0 v/m^2)y^2. in unit-vector notation, what is the electric field at the point (5.0m, 3.0m)? (express your answer in vector form.)

Explanation:

Given that:

                --- (1)

To find:

Electric field at point (5,3) in xy plane.

Electric field in plane s is related to V by:

For xy plane:

Using (1) in above two equations

In vector form

at (5,3)

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.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.