CHALLENGE A winch designed to be mounted on a truck, as shown in Figure 8, is advertised as being able
to exert a 6.8x103-N force and to develop a power of
0.30 kW. How long would it take the truck and the
winch to pull an object 15 m?

No bc a lot of things r still theories n unproven

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.

The answer is that they are composed mostly of liquid water.