what is the value of the gas constant, r, in units of l ⋅ atm mol ⋅ k ? report the value with at least three significant figures.

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Why should seat belts not be mandatory quick plz