A person observes a firework display from a safe distance of 0.750 kilometer. Assumign that sound travels at 340 m/s in air, what is the time between the person seeing and hearing fireworks explosion.

When using two-wire cable to feed a 240-v appliance that does not require a neutral wire, you should a. mark both ends of the white wire green. b. use the cable as is. c. use only the black wire. d. mark both ends and any exposed area of the white wire black.

Anybody wanna ? (picture included? )

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.