Uh.. what's the question..?
Two terminal device which can maintain a fixed voltage. Hope this help I need more detail in your question this is all I can provide. :)
Answer:
The explorer should travel to reach base camp to 5.02 Km at 4.28° south of due west.
Explanation:
Using trigonometric function like Sen(Ф), Cos(Ф) and Tan(Ф) we can get distance and direction that the explorer should travel to reach base camp. When we discompound the vector
y
so that
;
to get how far we use Pythagorean theorem so
so that 
elasticity stretches and can also return to it's normal size ..
Temperature difference is required, so i’m guessing - a. thermometer - would be required to check that temperature.