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  • NEED HELP WITH THIS!!?

    Now i understand that with the equation, FL = (dvr4 av 2di²)(2r),

    d = density of air

    v = velocity

    r = ball radius

    av = angular velocity in radians per second (if you have spin, n, in rpm, them av = (2pi n)/60)

    But what about "di"? It has me completely confused and no website says what it means. I thought it would be diameter and i tried it in an equation and it failed utterly. Can i get some help?

    2 AnswersMathematics10 years ago