Which of the following statements is correct about laws of conservation a) charge can be created but not destroyed
b) in absence of external torque , angular momentum remains conserved
c)under the action of conservative forces , potential energy of system remains conserved
d) under the action of non conservative forces total mechanical energy of systems remains conserved

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

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.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.