Changing the direction of current will or will not affect the strength of an electromagnet

Gunpowder residue is most likely to show up where on a shooters hands

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

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than