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

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?