Many earphones are designed in the way pictured below. A coil of wire carrying an electric current is wrapped around a tiny speaker cone. The cone and coil are placed near a small magnet. Sound is generated by the speaker cone vibrating in different ways. The cone vibrates as different magnetic forces act on the current carrying coil. Why do the magnetic forces acting on the coil change as the current running through the coil changes?

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

Fluids at rest possess no flow energy. a)- true b)- false