On a distance vs. time graph, how do you know when the object is moving away from its starting position?

Which fators influence ocean currents

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.

There are weak or strong attractive forces between atoms of liquids with a high viscosity