Suppose someone told you that she had discovered h ii around the star aldebaran. would you believe her? why or why not?

True or false: the revolution of the earth creates day and night as it rotates around the sun

Aballet student who learns with the of his instructor is demonstrating learning.

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.