a uniform metre has a mass of 90g and it's center of mass is the 50cm mark this ruler suspended by a thread at the 70cm mark, l balance by a mass of weight W hanging from the 80cm mark .. calculate the weight of the ruler

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.