The charges on two metallic balls are 5.0 and 7.0 coulombs respectively. they are kept 1.2 meters apart. what is the force of interaction between the two?
(k = 9.0 × 109 newton·meters2/coulomb2)

2.2 × 1011 newtons
4.1 × 10-7 newtons
5.0 × 1011 newtons
7.0 × 10-7 newtons

The graph indicates the running route for tobias. which best describes his run? from time 0 to 6, he went fast and then slowed down. from time 6 to 10, he was at his slowest. from time 12 to 14, he went very slow. from time 14 to 18, he went toward the starting point.

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?

Astream of surface water reaches a porous portion of sediment and seeps into the ground. this water eventually joins a large reservoir of water located beneath the earth's surface. the example above describes the interacting with the a. cryosphere; biosphere b. hydrosphere; biosphere c. hydrosphere; geosphere d. cryosphere; geosphere