Two block of masses m and M are connected by means of a metal wire passing over a frictionless fixed pulley. The area of cross-section of the wire is and its breaking stress is if the maximum value of M is K x 1.86 kg for which the wire will not break. Find the value of K.
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A ring of radius r made of wire of density is rotated about a stationary vertical axis passing through its centre and perpendicular to the plane of the ring as shown in the figure. Determine the angular velocity (in rad/s) of ring at which the ring breaks. The Wire breaks at tensile stress . Ignore gravity. Take = 4 and r = 1 m.
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