ESP 3942 Lecture 3: ESP

I've been having a few problems with this question. it said in part (a) to try to do it with energy methods but it didnt work and i tried to do it another way, with forces in both x and y directions but it didnt work that way either. can you please help me in this??

Could y’all answer my questions while im taking my exam ? i didnt study at all and I have an hour to do it. :/

how would it affect the volume of NaOH recorded for a titration if you didnt remove the air bubbles from the buret tip before beginning the titration