A typical long-period seimometer has a period of 30 seconds and a Q of about 2 . As a result of a violent earthquake the Earth's surface may oscillate with a period of about 20minutes and with an amplitude such that the maximum acceleration is about 10^-9 meter per second sqaure. How small a value of A must be observable if this is to be detected?​

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.