Answer:
a. Exactly the same as the magnitude of the charge of the proton.
Explanation:
The elementary charge (e) is the smallest electric charge that can exist in the universe. Any positive or negative electric charge can be expressed as a multiple of the elementary charge, since is the electric charge carried by a single proton or, equivalently, the magnitude of the electric charge carried by a single electron (-1e).
Answer:

Explanation:
Since the fly accumulated a positive charge of +73pC, it must have lost an equal number of negative charge of -73pC to the surface (because the housefly was neutral to begin with).
Therefore, to answer our question we have to ask ourselves <em>how many electrons combine to make -73pC of charge? </em>
The answer is since one electron carries a charge of
, the number
of electrons that make up -73pC
are


Thus, the housefly lost about 456 million electrons to the surface!
Earth's land and ocean surface to the atmosphere.
Answer:
The net force is zero, so the acceleration is zero
Explanation:
Newton's second law states that the acceleration of an object is proportional to the net force applied to it, according to the equation:
(1)
where
is the net force on the object
m is the mass of the object
a is its acceleration
In this problem, we have a sled acted upon two forces,
. So the net force on the sled is
(2)
however, we are told that the two forces are equal in magnitude but in opposite directions, so

So, eq.(2) becomes

and so eq.(1) becomes

which means

so the acceleration of the sled is zero, and if the sled was at rest, it will not move.