Rocco makes the graphic organizer shown to review the characteristics of transistors. (PNP Transistor on left and NPN on right )
***X is in NPN transistor
Which statement belongs in the region marked X?

The current flows toward the base from the emitter.
The base is more negative than the emitter.
The base is the center layer.
The main charge carriers are negative electrons

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents

Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.