Con lắc đơn đang đứng yên ở nơi có g=10m/s Lict 0 truyền cho con lắc vận tốc 20 cm/s nằm ngang theo chiều dương thì nó dao động điều hoà với chu kì 2n/5s. Phương trình li độ góc của con lắc là

The answer is b hope this

I'm not sure what your asking buddy.. but i know that you can weld two peices of steel by pure force and pressure.

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.