If two materials are made from different kinds of atoms, what else should you expect to be different?
a. the kinds of neutrons they have
b. the properties they have
c. the mass of their electrons
d. the charge of their protons

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

In a system, when potential energy decreases, then entropy also decreases. true false

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?