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A body of weight 20 N, mass 2 kg is moving in vertical circular motion with the help of a string of radius 1 m and with a velocity of 5 m/s. What is the tension in the string when is horizontal?(a) 30 N(b) 50 N(c) 20 N(d) 25 NI got this question in an interview for internship.The above asked question is from Uniform Circular Motion topic in chapter Motion in a Plane of Physics – Class 11

Answer»

Correct choice is (B) 50 N

For EXPLANATION: When the string is horizontal, the TENSION in the string and the centrifugal FORCE are opposite to each other. Centrifugal force can be calculated as mv^2/r = 50 N. HENCE the tension = centrifugal force = 50 N.



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