If a brass wire is 4 cm long with a diameter of 1.3 cm, can you use the set-up in this lab to measure its resistance? (Hint: consider the limitation of sensitivity for measuring voltage.) ( No. The voltage over the wire is 0.022 mV at 1.0 A and only 0.044 mV even at 2.0 A!)

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.)