Jeanine has made a model of the Sun, Earth and Moon system, shown below. She uses two balls and a light bulb for her model. The larger ball she uses as the Earth, and the smaller ball she uses as the moon,

(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.)