A47 kg child on a 1.5 m long swing is released 5 from rest when the swing supports make an angle of 22 ◦ with the vertical. the acceleration of gravity is 9.8 m/s 2 . if the speed of the child at the lowest position is 1.30868 m/s, what is the mechanical energy dissipated by the various resistive forces (e. g. friction, answer in units of j.

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.

It really doesn't matter for any of the questions that you've listed.