The purpose of a cell phone cover is to protect your phone from impact forces. How does a cell phone case do this?

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.

Aballet student who learns with the of his instructor is demonstrating learning.

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k