You create a transformer by wrapping wire around an iron nail. the number of turns are: primary (500); secondary (2500). the primary voltage is 3.00 v. the secondary current is 200 ma. this is like examples #14 and #15 (pages 16 & 17) of chapter 21 notes. 13) calculate the secondary voltage (v). 14) calculate the primary current (a).

The slope of a velocity time graph over any interval of time gives the during that interval

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.