The heat in an internal combustion engine raises the internal temperatures to 300 deg c. if the outside temperature is 25 deg c, what is the maximum efficiency of this engine? and is it possible to attin this efficiency?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

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.