MHT CET 2025 Physics question
A stone of mass 'm' kg is tied to a string of length 'L' m and moved in a vertical circle of radius 49 cm in a vertical plane. If it completes 30 revolutions per minute, the tension in the string when it is at the lowermost point is nearly [Take and acceleration due to gravity, g = 10 m/s]
Answer: (D)
Solution
Angular speed rad/s, radius m. At the lowest point the net upward force provides the centripetal force: , so $T = m(g + ω^2 r) = m(10 + π^2 × 0.49) = m(10
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