Ayuda por favor me urge Calcula la diferencia de presión entre dos puntos de una piscina situados a 80cm y 2m de la superficie respectivamente.​

How is the gravitational force related to the distance between two objects?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?