what is the direction of the rotational velocity vector of the jar lid when you open a jar of pickles?

Why does the input force have to be greater than the force needed to lift the bale?

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.

Will you chech and finish these for me, because i am stumped with them.