Two lab partners are doing a static electricity investigation. They begin with a negatively-charged aluminum pie plate. After conducting the procedure, they observe that the pie plate has become electrically neutral. Which statement accurately explains how this happened?

a. Electrons were added to the object. b. Protons were added to the object. c. Electrons were removed from the object. d. Protons were removed from the object.

The correct option is (c).

Explanation:

In the conduction process, the electrons get transferred from one object to the other object. The electrons are freely charged particles. Protons cannot  be moved freely.

In the given problem, the given aluminum pie plate is negatively-charged initially. After the conduction process, the plate gets electrically neutral.

It means that the excess of electrons from the aluminum pie plate is removed. Then, the number of electrons and the number of protons becomes equal. The plate becomes electrically neutral.

Therefore, the correct option is "Electrons were removed from the object".

a and b sometimes have a positive value

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.