FORCES - physics honors

thanks to anyone who answers :)

Let v1, v2, w be three linearly independent vectors in r 3 . that is, they do not all lie on the same plane. for each of the following (infinite) set of vectors, carefully sketch it in r 3 , and determine whether or not it is a vector space (i. e., a subspace of r 3 ). explain your reasoning

Which type of wave can travel without a medium

What are similarities and differences of reflection, refraction, diffraction and absorption?