u have to have a input jack on your car and plug a cable in between them.
Can't guess what you are talking about. But I guess if you stretch the usb cord tight enough you could use it to twang out a song.
And use the pointy end of the charger as a pick. There ya go.
If you mean can you use a car charger as a 12 v DC power supply for something like a CD player, the answer would be "NO." Car chargers, although they put out DC, are VERY noisy plus may exceed 12 v.
not easily, as far as I know. look for a radio transmitter with a headphones jack... plug that into your mp3 player....JavaNut