A stone of mass 0.3kg attached to a 1.5m long string is whirled around in a horizontal circle at a speed of 6ms- 1 . The tension in the string is

Question

A stone of mass 0.3kg attached to a 1.5m long string is whirled around in a horizontal circle at a speed of 6ms- 1 . The tension in the string is (A) 10N (B) 20N (C) 7.2N (D) None of these

Tardigrade Admin · Accepted Answer

The force of tension in the string provides required centripetal force to keep the stone in circular motion. ∴ T=(m v2/R)=(0.3 ×(6)2/1.5)=7.2 N

Q. A stone of mass $0.3 k g$ attached to a $1.5 m$ long string is whirled around in a horizontal circle at a speed of $6 m s^{- 1}$ . The tension in the string is

$10 N$

$20 N$

$7.2 N$

None of these

The force of tension in the string provides required centripetal force to keep the stone in circular motion.
$∴ T = \frac{m v ^{2}}{R} = \frac{0.3 \times ( 6 ) ^{2}}{1.5} = 7.2 N$

Q. A stone of mass 0.3kg attached to a 1.5m long string is whirled around in a horizontal circle at a speed of 6ms−1 . The tension in the string is

10N

20N

7.2N