Carbon-12 is described as "Stable". I just had this question on my homework :P Hope it helped!
Part a
Just use v=d/t
d = vt
d = 7 x 1.5
For part b
Vf=Vi +at
Vf=0 + (9.8)(1.5)
d= ((Vi + Vf) /2) x t
d = ((0 + Vf) /2) x 1.5
In second equation, use Vf found in first equation
To calculate the number of electrons from spherical conductor first we use the formula,
Here, k is a constant with a value of , q is the charge and r is the radius and its value of 0.200 m.
Substituting these value in above formula, we get
or
Now number of electron,
Hence, the number of electrons to be removed from conductor would be
There is no such thing as an AC Generator, if its a generator, its DC. I think you are talking about an AC Alternator, in which case the answer would be -wrong answer, deleted-