A (an) __helps lessen the effects of thermal pollution

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =