A 2.0 m × 4.0 m flat carpet acquires a uniformly distributed charge of −−10 μC after you and your friends walk across it several times. A 4.5 μg dust particle is suspended in midair just above the center of the carpet.
What is the charge on the dust particle?

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.