How did rutherford's experiments demonstrate that thomson's model of the atom was incorrect? a. they showed that atoms have net positive charges. b. they showed that atoms are made up of smaller particles. c. they showed that electrons make up most of the mass of an atom. d. they showed that atoms have a dense nucleus.

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Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

Plz explain what friction, corollas, and a low pressure gradient does to an air parcel. what is 1+1=