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A bob of mass m = 0.300 kg is suspended from a fixed point with a massless string of length L = 21.0 cm. You will investigate the motion in which the string traces a conical surface with half-angle theta = 19.0^circ.

What tangential speed v must the bob have so that it moves in a horizontal circle with the string making an angle 19.0^circ with the vertical?

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