A metal wire X with length L and radius r has a resistance R. A wire Y of length 4 L made from the same material as X has the same resistance R. What is the radius of Y?

answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

explanation:

close lines strong magnet less close weaker

in physics zero. in muscle fatigue could be high