You cannot adjust the volume of sound that has been recorded on a file.
a. true
b. false

Ithink the answer for this is: an electromagnet is a magnet  with a soft metal core.

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.

Answer braking too hard

Answer/// the energy that does not do useful work is converted into thermal energy