An equilateral triangular frame is made of three thin massless rods. Three-point masses of mass 'm' each are fixed at vertices of frame as shown. The system is rotated with uniform angular speed ω about an (fixed) axis passing through A and normal to plane of triangular frame. Neglect the effect of gravity. The tension in rod connecting mass B and C is –
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B moves in dotted circle of radius λ with uniform speed. Massless rod 1 can exert force T 1 on B only along its length. Hence T 1 contributes only to centripetal acceleration of B. The tension in rod 2, that is, T 2 can contribute to both tangential and centripetal acceleration of B. Since tangential acceleration of B is zero.
Hence T 2 = 0.
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