Which statement best explains why the overall charge on an atom is zero?

a: the positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud.
b: the positive charge of the protons in the nucleus equals the negative charge in the electron cloud.
c: the negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud.
d: the negative charge of the protons in the nucleus equals the positive charge in the electron cloud.

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p

Apair of 10μf capacitors in a high-power laser are charged to 1.7 kv.a. what charge is stored in each capacitor? b. how much energy is stored in each capacitor?

What are the necessary conditions for fusion?