Answer:
The mass number of an element is the number of protons plus neutrons.
Explanation:
The mass number of an element is the number of protons plus neutrons, so the correct answer is the option C.
We must write down laws of conservation of momenta and energy.
For the law of conservation of momenta will we will use two axes. One will be x-axis that will correspond to the east, and the other one will be y-axis corresponding to the north. Jack will be marked as 1 and Jill will be marked as 2.
Law of conservation of energy:

This will give us Jill's velocity after the colision.

Law of conservation of momenta:

We will use the second equation to get the angle at which the Jill is traveling:

When we plug all the number we get:

Please note that this is the angle below the x-axis.
Biosphere is life water and rocks
The current is defined as the ratio between the charge Q flowing through a certain point of a wire and the time interval,

:

First we need to find the net charge flowing at a certain point of the wire in one second,

. Using I=0.92 A and re-arranging the previous equation, we find

Now we know that each electron carries a charge of

, so if we divide the charge Q flowing in the wire by the charge of one electron, we find the number of electron flowing in one second:
Explanation:
Plasma can conduct electricity because plasma consists of electrically charged particles called ions, instead of uncharged particles such as atoms or molecules.