Question

A $2 \, \, \text{kg }$ stone tied at the end of a string $1 m$ long is whirled along a vertical circle at a constant speed of $4 \, m \, s^{- 1}$ . The tension in the string has a value of $52 N$ when the stone is

• A. At the top of the circle
• B. Half way down
• C. At the bottom of the circle
• D. Half way up

Answer 1

The Correct Option is C

Here, $m=2 \, kg,r=1 \, m,v=4 \, m \, s^{- 1}$ Tension at the bottom of the circle, $T_{L}=mg+\frac{m v^{2}}{r}$ $=20+\frac{2 \times 4^{2}}{1}=52 \, N$