Heat is absorbed during which of the following changes?
a. running a gas-powered generator
b. burning a match
c. toasting a marshmallow
d. starting a chemical heating pad

In a series circuit the __ is the same at every point

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)

2. circled insects have mutations, or changes to their dna. how many of the offspring insects in this generation have mutations?