What happens to the force needed to stretch an elastic object?

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

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

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)