MHT CET 2026 Physics question
A stone of mass 40 g is tied to a light inextensible string of length 50 cm and whirled in a vertical circle at the rate of 30 revolutions per minute. The tension in the string when it is at the lowest point of the circle is (Take gravitational acceleration, g = 10 m/s and = 10)
Answer: (C)
Solution
Data in SI units: kg, m, frequency rev/s, so rad/s (the stone is whirled at a uniform rate). At the lowest point the tension acts upward and weight downward, and the net force towards the centre supplies the centripetal force: $T - mg =
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