Planets and stars look very similar. How can people on Earth tell that planets and stars are different?

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.

Ascientific blank must be testable and capable of being proven false?

Acar of mass 800kg is moving at a speed of 2.2m/s.