How are thunderstorms kept alive? a) Downdrafts
b) Updrafts
c) Return stroke
d) Thunder
e) Step leader

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?