What is the position of the center of mass of the bar, measured as distance x from the bar's left end

How are calculation for velocity and speed different

(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.)

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above