A 0.160 kg ball attached to a light cord is swung in a vertical circle of radius 70.0 cm. At the top of the swing, the speed of the ball is 3.26 m/s. The centre of the circle is 1.50 m above the floor. Determine the magnitude of the tension in the cord when the cord is 30.0̊ below the horizontal.

Question

A 0.160 kg ball attached to a light cord is swung in a vertical circle of radius 70.0 cm.  At the top of the swing, the speed of the ball is 3.26 m/s.  The centre of the circle is 1.50 m above the floor. Determine the magnitude of the tension in the cord when the cord is 30.0̊ below the horizontal.

souvik · Answer

is it 30 (degree) bellow horizontal???
hints:
find the velocity of the ball at that point using conservation of energy...and draw a simple diagram..draw the forces..and find the tension of the string.