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Answer on Mechanics | Relativity Question 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.


Expert's answer
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.


When the string is cut rod rotates about other end. Let's take moment equation about that end:

mg*l/2 = Iα [I = ml^2/3]

mgl/2 = ml^2/3 * α

Angular acceleration:

& α = 3g/2l

Acceleration of end B:

a = lα = 3g/2 = 14.7 [g=9.8].

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