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Question

A uniform thin rod of mass 'm' and length L is held horizontally by two vertical strings attached to the two ends. One of the string is cut. Find the angular acceleration soon after it is cut

A
g2L
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B
gL
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C
3g2L
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D
2gL
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Solution

The correct option is A g2L
Just after the cutting of the string,
Taking Moment about one end of the rod which is attached to the string,
mg×l2=I×α , ( Where I=ml23 )
α=3g2l

925038_295977_ans_29f59ab321774d4dbf33830c79c62a42.JPG

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