Resultant velocity of an airplane the flies 200 km/h if it encounters a 50 km/h tailwinds

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Positrons are spontaneously emitted from the nuclei of

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.