over the summer break, jed earns extra cash working as a salesman at sensational sound systems. as one of the most knowledgeable salesmen on staff, jed tells a young couple shopping for a sound system that the more expensive models are worth the money because they

a. amplify sound up to 160 db
b. filter out frequencies below 1 hz
c. boost frequencies below 80 hz
d. buffer sounds that reach 60 db

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.