a 1.8kg box rests on a plank that is inclined at an angle of 63 degrees above the horizontal. The upper end of the box is attached to a spring with a force constant of 18. If the coefficient of static friction between the box and the plank is 0.15, what is the max amount the spring can be stretched and the box remain at rest

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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.

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