An airplane is accelerating forward due to a force of 3320 newtons acting
on it. then it encounters wind resistance that exerts a backward force of
550 newtons. what is the net force, in newtons, acting on the airplane?

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.

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2

In which of these cases are the two wave points considered to be in phase with each other?