A tornado is formed when a tube of air circulating a horizontal axis is tilted up vertical by the updraft from a thunderstorm. If is time, this process can be modeled by the wind velocity field

(a)
=



(b) Find
=

In which direction does this vector point (horizontal, vertical, or in betweeen)?
horizontal


(c) Find
=

In which direction does this vector point (horizontal, vertical, or in betweeen)?
Choose


(d) Find
=

In which direction does this vector point (horizontal, vertical, or in betweeen)?
Choose