Q. A bucket tied at the end of 11.6 m long string is whirled in a vertical circle with a constant speed. The minimum speed at which water from the bucket does not spill when it is a the highest position is
A) 4 $ms^{- 1}$
B) 6.25 $ms^{- 1}$
C) 2 $ms^{- 1}$
D) 16 $ms^{- 1}$
Explanation
(a) For water not to spil, $\frac{mv^{2}}{r} = mg$
or $v = \sqrt{r\ g} = \sqrt{1.6 \times 10} = 4\ ms^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.