There is a 5 kg block sitting on the floor. if the block is being pushed horizontally with a force of 33 n and friction between the block and the floor acts with a force of 15 n, what is its acceleration?

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.