Question

A particle of mass 100g swings in vertical circle using string of length lm with speed 4 m s. When string is in horizontal position, the tension in the string is (Take g = 10 m/s2) 0.4 N 2.58 N 1.6 N 0.85 N
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Answer 1

Explanation:

As given that breaking tension of string is 10N so the tension in the string when we rotate the mass should be less than 10N

⇒T≥m

R

v

2

⇒v≤

m

TR

given that m=100g=0.1kg, R=0.5m

⇒v≤

0.1

10×0.5

⇒v≤

50

⇒v≤7.07m/s