Ahat contains 100 coins, where at least 99 are fair, but there may be one that is double- headed (always landing heads); if there is no such coin, then all 100 are fair. let d be the event that there is such a coin, and suppose that p(d) = 1/2. a coin is chosen uniformly at random. the chosen coin is flipped 7 times, and it lands heads all 7 times.

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

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)