A) 4 radians/sec
B) 16 radians/sec
C) \[\sqrt{21}\] radians/sec
D) 2 radians/sec
Correct Answer: A
Solution :
Max. tension that string can bear = 3.7 kgwt = 37N Tension at lowest point of vertical \[\text{loop}=mg+m{{\omega }^{2}}r\] = \[0.5\times 10+0.5\times {{\omega }^{2}}\times 4=5+2{{\omega }^{2}}\] \ 37 = 5 + 2w2 Þ w = 4 rad/s.
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