I think thats a trick question on the periodic table there is no Z, theres Zi which is zinc but no Z
Answer:

Explanation:
For this case we know that the charge associated to the transferred electrons of the small spark is
and we want to find the number of electrons transferred.
From the properties of matter we know that the charge of the electron is

And we know that the total charge is given by this expression:

Where Q represent the charge, n the number of electrons and e the charge of the electron.
If we solve for n we got:

And replacing we got:

Answer:
Each climber had to eat 72 slices of bread to compensate for the increase of the gravitational potential energy of the system climbers-Earth
Explanation:
Hi
One piece of bread releases about
of energy in the body, but efficiency in converting the body's chemical energy into mechanical work is 9.5 %, so
.
On the other hand, we need to calculate the total work to reach the top of Mt. Everest
, so 
Finally, we have that 
Light of the moon is from the light of the sun. So if you're in a certain area where the angle from where your seeing the moon happens to be where the sun's light shines throughout that area. You see a full moon. It's like shining a flashlight on a ball. You move around it and you see half of the light, quarter of the light or even none at all.