Aviolinist plays a note with a wavelength of 0.77955 m. if the speed of the sound is 343 m/s, what pitch is this note?

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

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.