u with rightwards arrow on top, v with rightwards arrow on top e w with rightwards arrow on top são três vetores tais que w with rightwards arrow o...

u with rightwards arrow on top, v with rightwards arrow on top e w with rightwards arrow on top são três vetores tais que w with rightwards arrow on top space equals u with rightwards arrow on top space cross times space v with rightwards arrow on top space, isto é, w with rightwards arrow on top é o produto vetorial de u with rightwards arrow on tope v with rightwards arrow on top. Diante dessas informações, assinale a alternativa correta. A) w with rightwards arrow on top é não nulo e perpendicular a u with rightwards arrow on tope v with rightwards arrow on top somente se u with rightwards arrow on tope v with rightwards arrow on top não tiverem a mesma direção. B) u with rightwards arrow on top, v with rightwards arrow on top e w with rightwards arrow on top são, necessariamente, perpendiculares entre si. C) Quaisquer que sejam u with rightwards arrow on tope v with rightwards arrow on top, w with rightwards arrow on top é, necessariamente, perpendicular a u with rightwards arrow on tope v with rightwards arrow on top, e open vertical bar w with rightwards arrow on top close vertical bar greater than 0. D) open vertical bar w with rightwards arrow on top close vertical bar equals open vertical bar u with rightwards arrow on top close vertical bar plus open vertical bar v with rightwards arrow on top close vertical bar E) open vertical bar w with rightwards arrow on top close vertical bar equals open vertical bar u with rightwards arrow on top close vertical bar cross times open vertical bar v with rightwards arrow on top close vertical bar