Which of the following is true?
a. weight and mass are proportional but not equal
b. weight is gravitational force an object experiences due to its mass
c. the weight of an object on earth is greater than the weight of the same object on the moon, but the object's mass stays the same
d. all of the above

I believe the correct response would be D. All of the above, as all of the statements concerning weight of a particular object and mass are true.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.