Topic: Engineering Mechanics
A stone of mass m at the end of a string of length l is whirled in a vertical circle at a constant speed. The tension in the string will be maximum when the stone is
- A. At the top of the circle
- B. Half-way down from the top
- C. Quarter-way down from the top
- D. At the bottom of the circle
Answer: D. At the bottom of the circle
Explanation: At the bottom, the tension in the string is maximum because the weight of the body and the centrifugal force both act in the downward (outward from center) direction. T = mg + mv²/r.