A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless? There are no forces acting on the rock.

The sidewalk exerts an unbalanced force on the rock.

The only force acting on the rock is directed at the sidewalk.

The forces acting on the rock are all balanced.

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.

What happens when light is scattered?

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore