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A small block with mass 0

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A small block with mass 0.370 kgkg is attached to a string passing through a hole in a frictionless, horizontal surface (Figure 1). The block is originally revolving in a circle with a radius of 0.800 mm about the hole with a tangential speed of 4.00 m/sm/s. The string is then pulled slowly from below, shortening the radius of the circle in which the block revolves. The breaking strength of the string is 30.0 NN.  What is the radius of the circle when the string breaks?