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प्रश्न
A stone of mass 5 kg. tied to one end of a rope of length 0.8 m, is whirled in a vertical circle. Find the minimum velocity at the highest point and at the midway point.
[g = 9.8 m/s2]
उत्तर
m = 5 kg, r = 0.8 m, g = 9.8 m/s2
Minimum velocity at the highest point (vH) = ?
Minimum velocity at midway point (vM) = ?
At highest point,
`V_H=sqrt(rg)`
`=sqrt(0.8xx9.8)`
`=sqrt7.84`
`=2.8` m/s
The minimum velocity at the highest point is 2.8 m/s. At midway point,
`V_M=sqrt(3rg)`
`=sqrt(3)xx2.8`
`=1.732xx2.8`
`=4.849` m/s
`~~4.85 m/s`
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