The center of gravity method is used to travel time, distance, and costs.

c) up is the direction the magnetic force is acting on the charge.

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

answer(20) psi;