Scientists used to believe that the earth was the center of the universe. which invention was primarily responsible for obtaining evidence against this? a. sextant b. astrolabe c. hubble telescope d. optical telescope

Two identical 82 mg dust particles very far apart (pee 0) are moving directly toward each other at a speed of 3698 m/s. the charge on each is-719 ? c. determine how close they will get to each other. let k = 9x109 n-m2/c2 & ignore gravity.

What is the role of the ocular lens?

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?