9. Find the value of the commutator [x, P^2] and [xy, P^2).

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

Explain why electric current cannot exist if a current doesn't have a voltage source.

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?