A 12.0-kg object hangs in equilibrium from a string with a total length of L = 5.00 m and a linear mass density of μ = 0.001 00 kg/m. The string is wrapped around two light, frictionless pulleys that are separated by a distance of d = 2.00 m (Fig. P18.69a)
(a) Determine the tension in the string.
(b) At what frequency must the string between the pulleys vibrate in order to form the standing wave pattern shown in Figure P18.69b?

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นี้ NE Figure P18.69