Hai swings a ball in a vertical circle at the end of a string that always remains taut (putting tension in the string.) At the top of the circle, the centripetal force on the ball is

(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.)

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Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two