A metallic sphere has a charge of +4.0 nC. A negatively charged rod has a charge of -6.0 nC. When the rod touches the sphere, 8.2 x 109 electrons are transferred. What are the charges of the sphere and the rod now? [Sphere = 2.688 nC and Rod=-4.688 nC]

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.

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

In an experiment, how can i change human errors? be specific.