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# A particle of mass m attached to the end of string of length l released from horizontal position . The particle rotates in circle about o as shown. When it is vertically below o the string makes contact with nail N placed below o at a distance h and rotates around it . For particle to swing completely around nail in a circle ,A)hB)h>_3/5lC)hD)h>_2/5l

2 years ago

Khimraj
3007 Points

speed required
$\geq$ $\sqrt{5*g*(l-h)}$
and velocity well ball reached bottom = $\sqrt{2*g*l}$
so
2*g*l $\geq$ 5*g(l-h)
h$\geq$  (3/5)*l
Hope it clears...................................................
2 years ago
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• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions