12. suppose a person uses a mechanical iack to lift half the weight of a car with a
mass of 1200 kg. during each stroke of the jack handle, the person's hand is
pushing for a distance of 40.0 cm but the car is lifted only 5.0 mm. a)
assuming the jack is 100% efficient. how much force must the person exen
on the handle as the car is lifted? (b) if the actual amount of force required on
the handle is 90.0 n, what is the actual efficiency of the jack?

He can play two games. 13/4=3.253.25*2=6.5

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.

Supply is the markets term for selling a specific quantity of products at various prices. the law of supply and demand is the one which affect the pricing and also the quantity the market is able to produce or make available.

Ai think hope that