# Thread: demolition ball, whats the tension in the cable

1. ## demolition ball, whats the tension in the cable

A 1900 kg demolition ball swings at the end of a 15 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 7.4 m/s. Determine the tension in the cable.

also i know that the tension force has the same purpose as the normal force.

2. Originally Posted by rcmango
A 1900 kg demolition ball swings at the end of a 15 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 7.4 m/s. Determine the tension in the cable.

also i know that the tension force has the same purpose as the normal force.

The tension is equal to the sum of the weight ($\displaystyle mg$) and the force needed to
deflect linear motion into circular motion about the suspension point ($\displaystyle mv \dot{\theta}$).

RonL

3. Originally Posted by rcmango
A 1900 kg demolition ball swings at the end of a 15 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 7.4 m/s. Determine the tension in the cable.

also i know that the tension force has the same purpose as the normal force.

$\displaystyle \sum F_y = F_c$