Work done by the block sliding = force * distance = mass * g * uk * distance this is equal to the initial KE of the block and bullet, KE = 1/2 * mass * speed^2 then you use the conservation of momentum to find the speed of the bullet.
2 Answers · Science & Mathematics · 07/12/2019
Assuming all three wires are made out of the same material you can determine the total (equivalent) resistance of the parallel wires using V=IReq and from there you can determine the total resistance of each wire using the parallel resistance equation. 1/Req...
1 Answers · Science & Mathematics · 28/04/2019