When testing for current in a cable with nine ​color-coded wires, the author used a meter to test four wires at a time. How many different tests are required for every possible pairing of four ​wires?

An object has a weight of 500 on earth what is the mass of this object

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.

The energy released by a nuclear fusion reaction is produced when