The power supply for your answering machine is a small black cube that plugs directly into an electric outlet. the main component in this supply is a transformer and a moderate current from the 120-volt power line flows through the primary coil of this transformer. if the transformer’s primary coil has 20 times as many turns of wire in it as the secondary coil has, then the secondary coil provides: (a) a large voltage rise for the large amount of current that flows through it. (b) a small voltage rise for the large amount of current that flows through it. (c) a small voltage rise for the small amount of current that flows through it. (d) a large voltage rise for the small amount of current that flows through it.

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f

Select the correct answer. what does the process of natural selection involve?

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.