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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?

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?

Grade:11

2 Answers

Aditi Chauhan
askIITians Faculty 396 Points
7 years ago
236-1397_1.PNG
Therefore, the tension in the string at the bottom is 8.8 N .
236-1671_1.PNG
Therefore, the net force experienced by the ball has the magnitude of 37.9 N .
236-1595_1.PNG
Therefore, the speed with which the ball rotates is 6.45 m/s .
islam
13 Points
4 years ago
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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