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

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?