What happens to the Doppler effect in air (i. e., the shift in frequency of a sound wave) as the temperature increases?

An observer that stands still as the electron moves by him, will observe

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.

The mantle is made up of which structural zones?