The "power cube" transformer for a portable cd player has an output of 6.9 v and 600 ma (both rms) when plugged into a 120 v outlet. a. if the primary coil has 400 turns of wire, how many turns are on the secondary coil? b. what is the peak current in the primary coil?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

What part of the ear is names after tools, such as the hammer and the anvil?