A physics major is cooking breakfast using a steel spatula and a Teflon frying pan. The coefficient of kinetic friction between the two materials is 0.04 and the normal force is 8N. What is the magnitude of the kinetic friction force between the two surfaces .

(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.)