11. Which statement correctly describes both gases and liquids? A. Their shapes stay the same in any container.
B. Their shapes change when they are in different containers.
C. Their volumes stay the same in any container.
D. Their volumes change when they are in different containers.

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)