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 the figure on the right. 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?

Question

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 the figure on the right. 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?

Bot · Answer

(a) The tension in the lower string is also 35.0 N.

(b) The net force on the ball is 0 N.

(c) The speed of the ball is determined by the angular velocity of the system, which can be calculated using the equation: v = rω, where r is the radius of the triangle (1.70 m) and ω is the angular velocity.