Which step of the scientific method is the following sentence? Mr. Burgess said, "Looking at grades and the work people do, I conclude that kids who do the work also get good grades."

A: recognize a problem
B: form a hypothesis
C: test the hypothesis with an experiment.
D: draw conclusion(s)

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

In an experiment, how can i change human errors? be specific.

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.