A student wants to drag a box of books across the floor to his room, which is 2 m from where he is standing. If he applies a force of 300 N at an angle of 30° to the horizontal, how much force actually does work to move the box?
-150 N
-300 N
-0 N
-260 N

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

Argon, neon, and xenon are examples of

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)