A 37 kg father fashions a swing for his children out of a long rope that he fastens to the limb of a tall tree. As one of the children swings from this rope that is 7.3 m long, his tangential speed at the bottom of the swing is 4.0 m/s. Required:
a. What is the centripetal force of the child at the bottom of the swing?
b. What provides the centripetal force that keeps the child moving in an arc?

1. gravitational acceleration
2. the height of the tree
3. the tension in the rope
4. the weight of the child

Ithink the answer is c but then again i'm probably wrong

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.