If a lithium has 3 protons, 3 neutrons, and 3 elestrons, an isotope of this atom would have how many protons, neutrons, and electrons

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?

What caused magnetic fields? what happens if you keep breaking a magnet in two until you reach a single atom?