1)The internal combustion engines found in most automobile are heat engines that operate between the internal engine temperature around 90 degree centigrade and the ambient outdoor temperature around 15 degree centigrade in MN in late September.
a) What is the maximum possible efficiency for such an engine?
b) How much heat must be released into the air if 1200J of work is to be done?
c) Given that automobile engine operates irreversible, is the actually heat released greater than, less than, or equal to the value you calculated in part b)? explain your reasoning.
d) Would you expect the engine be more efficient or less efficient on a winter day with an air temperature of _15 degree centigrade? Try to reason it out without doing a calculation.