1. when a particle moves in a circle with constant speed, its acceleration is
a) constantly increasing.
constant in direction.
c) zero.
d) constant in magnitude.
e) constant in magnitude and direction.

What does the term discrediting mean?

Could we see a galaxy that is 20 billion light-years away?

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.