If a mass of 0.55kg attached to a vertical spring stretches the spring 32.0 cm from its original equilibrium, what is the spring constant?

How would you place two electrons on a sphere of radius r so that the electrostatic potential energy is minimized. how would you place three electrons to solve the same problem.

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

(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