3. Which type of signal is a more exact and precise representation of its source? Explain. 4. Which type of signal is a more efficient way to send information? Explain.

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.

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?

Which of these activities increases the amount of carbon in the atmosphere?