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A 1.34-kg ball is attached to a rigid vertical rod by means of two massless strings each 1.70 m long. The strings are attached to the rod at points 1.70 m apart. The system is rotating about the axis of the rod, both strings being taut and forming an equilateral triangle with the rod, as shown in Fig. The tension in the upper string is 35.0 N. (a) Find the tension in the lower string. (b) Calculate the net force on the ball at the instant shown in the figure. (c) What is the speed of the ball?
Therefore, the tension in the string at the bottom is 8.8 N .Therefore, the net force experienced by the ball has the magnitude of 37.9 N .Therefore, the speed with which the ball rotates is 6.45 m/s .
it must be sin60 not sin 30 because the distance between an equilateral triangle, the angles shown in red are equal to 60°.
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