The voltage(or electric potential) of battery determines
a. how much net electric charge is in the battery
b. how much work the battery can do on an electric charge
c. how much electric field is around

measure their densities same density, same sub

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.