1. A giant wheel, 40 meters in diameter, is fitted with a cage and platform on which a man can stand. The wheel rotates at such a speed that when the cage is at the top of the wheel, then the force exerted by the man on the platform is equal to his weight. The speed of the man is: 2. T + mg = mv^2 / r and in this specific problem, v = m. 3. T + m(9.81) = mv^2 / 40 40(T + m(9.81)) = mv^2 Square root of [ (40(T + m(9.81))) / m ] I think I am on the right track, but I am not really sure what do from this point.