A particle of mass m is tied to a string of length l on a smooth incline plane of inclination θ=30∘. Particle is imparted a velocity of Vo at the bottom most point so that particle moves in a circle of radius l.
A
Minimum value of Vo so that particle complete circle is √5gl2
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B
For V0=√5gl2 tension in string will never become zero
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C
Maximum tension in string if Vo=√5gl2 is 3mg
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D
Minimum tension in string for Vo=√2gl is not zero
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Solution
The correct options are A Minimum value of Vo so that particle complete circle is √5gl2 C Maximum tension in string if Vo=√5gl2 is 3mg
Take g1=gsinθ=g2 At top posion,
T = 0 ⇒ m/g1=m/v2l v=√g′l=√g2l By conservation of energy, ⇒12m/v2+2m/g′l=12m/V2o g1l2+2g1l=V202⇒5g1l=V20 V0=√5g1l=√52gl If the speed is √52gl, or below, the tension becomes zero. The maximum tension occurs at the bottom most position. T=mg+mV20l, when V0=√52gl, T becomes 3mg.