PLEASE PLEASE PLEASE HELP ME HAS TO BE TURNED IN AT 9:00

Can someone me with questions 15 to 17 plz.

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d