You pull a short refrigerator with a constant force f across a greased (frictionless) floor, either with f horizontal (case 1) or with f tilted upward at an angle θ (case 2).
(a) what is the ratio of the refrigerator's speed in case 2 to its speed in case 1 when you pull for a certain time t? give your answer in terms of θ.
vcase 2
vcase 1
=
(b) what is this ratio if you pull for a certain distance d?
vcase 2
vcase 1
=

Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability and (2) wind shear present in the lower atmosphere. elaborate on what does instability mean when discussing the formation of a tornado? a) dry air in the middle atmosphere being rapidly cooled by rain b) winds at all levels of the atmosphere are strong and turn with height c) an isolated strong thunderstorm just ahead of a squall line that merges with the squall line d) very warm, humid conditions in the lower atmosphere; cooler than usual conditions in the upper atmosphere