If r=BT^2 I + ct^3 j, where b and c are positive constants. When does the position vector make an angle 45 with x and y axes

Explanation:

Given

The position vector is

So, the angle made by position vector is at

At  , position vector makes with x and y axes

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.