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# Answer to Question #8098 in Mechanics | Relativity for Ashley

Question #8098
A rod of length 56.0 cm and mass 1.40 kg is suspended by two strings which are 42.0 cm long, one at each end of the rod. The string on side B is cut. Find the magnitude of the initial acceleration of end B. The string on side B is retied and now has only half the length of the string on side A. Find the magnitude of the initial acceleration of the end B when the string is cut.
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2012-04-03T11:54:00-0400
A rod of length 56.0 cm and mass 1.40 kg is suspended by two strings which are 42.0 cm long, one at each end of the rod.
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The string on side B is cut. Find the magnitude of the initial acceleration of end B.
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The string on side B is retied and now has only half the length of the string on side A.
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Find the magnitude of the initial acceleration of the end B when the string is cut.

When the string is cut rod rotates about other end. Let&#039;s take moment equation about that end:

mg*l/2 = I&alpha; [I = ml^2/3]

mgl/2 = ml^2/3 * &alpha;

Angular acceleration:

& &alpha; = 3g/2l

Acceleration of end B:

a = l&alpha; = 3g/2 = 14.7 [g=9.8].

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