If F applied is 17 Newtons to the right, what is the magnitude and direction of

There's some missing context here, but I would guess you're talking about a box or something with some mass m being pushed over a flat surface. Since it's moving with constant velocity, there is no acceleration and so the box is in equilibrium. In particular, the horizontal forces cancel each other. If f is the magnitude of the friction force, then

17 N + (-f ) = 0

f = 17 N

and this force points opposite the direction of motion.

There are many differences between nuclear fission and fusion.
Nuclear Fission is :
-the splitting of a nucleus into smaller particles, releasing a high amount of energy
-Does not occur naturally
-produces many highly reactive particles
-energy released is million times greater that in chemical reactions but lower than the energy released by nuclear fusion

Nuclear fusion is:
-the combination of 2 smaller atoms to create a large atom releasing energy
-Occurs in stars such as the sun
-produces few radioactive particles, but requires fusion trigger
-energy released is 3 to 4 times greater than the energy released by fission