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5.work,energy,power and collision — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
A $1\, kg$ stone at the end of $1\, m$ long string is whirled in a vertical circle at constant speed of $4\, m/s$. The tension in the string is $6\, N$ when the stone is at $(g = 10\, m/s^2)$
  • ✓
    top of the circle
  • B
    bottom of the circle
  • C
    half way down
  • D
    None of these
✓

Answer

Correct option: A.
top of the circle
a
Tension at the top $ = \frac{{m{v^2}}}{r} - mg = 6\,N$

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