However, Cauchy observed that the stress vector T {\displaystyle T} across a surface will always be a linear function of the surface's normal vector n {\displaystyle n} , the unit-length vector that is perpendicular to it.
Some do and some don't. A Nintendo Wii costs approximately $250 (the price range is $160-$380). <br /><br /> Don't forget that, in addition to the Wii itself, you have to buy games and controls; that'll cost an extra $50-$100.
You can also purchase a Wii Classic Controller ($19), Wii Remote Controller ($40), Wii Controller Charge Station ($30). If you want to cover almost everything at once, you can buy the Total Action Kit ($99), that comes with a steering wheel, golf putter, tennis racket, baseball bat, two swords, and a gun.