All of the following would be questions that could be scientifically investigated except: a. what is the proper number of children to have in today's family? b. will equal sizes of styrofoam and wood have the same mass? c. does adding salt to water raise its boiling point? d. does lack of sunlight affect plant growth?

Asubmarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. what is the approximate pressure (water plus atmospheric) at this depth? (recall that the density of seawater is 1025 kg/m3, g = 9.81 m/s2, and 1 kg/(ms2) = 1 pa = 9.8692 10-6 atm.) a. 34.8 atm b. 24.8 atm c. 25.8 atm d. 7.8 atm

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.