ASAP PLEASE A stone was thrown vertically upwards from height 1.60m above the ground with a speed of 18.0 ms^-1 at an angle of 52.0 degrees to the horizontal. Calculate:

a) the maximum height =

b) the vertical component of velocity when it hits the ground =

c) the time taken to reach the ground =

d) the range=

e) the velocity of impact=

How many electrons does each element require in its valence shell to become stable?

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

If a weighted, air-filled balloon sinks in a lake, it will a. be buoyed up with constant force while sinking b. probably sink to the bottom and probably rise later c. sink until it reaches equilibrium and then remain at constant depth d. always sink to the bottom e. none of the above