Q.

A uniform rod is rotating about one of its end with a constant angular velocity ω in gravity free space. The radial strain produced in two halves is k>1. Then find the value of 20k11.

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a

1

b

2

c

3

d

4

answer is D.

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Detailed Solution

dL=TAYdx=mω22ALYdx  ∵T=mω22LL2-x2 ∴∆L=mω22ALYL2x-x33 ∆L for entire rod=k.2L33=k = constant ∆L for first half =kL312-124=11kL324 ∆L for second half=kL323-1124=524kL3 ∴k=115 ∴20k11=4
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