: A stone is thrown from a rooftop at time t = 0 seconds. Its position at time t is given by r(t)=8t i -5t j +(14.7-4.9t^2)k . The origin is at the base of the building, which is standing on flat ground. Distance is measured in meters. The vector i points east, j points north and k points up. A)How high is the rooftop?B)When does the stone hit the ground?C)Where does the stone hit the ground?D)How fast is the stone moving when it hits the ground?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Give an example in which the electrical energy changes to light energy

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