A) 4 s
B) 2 s
C) 8 s
D) 10 s
E) 3 s
Correct Answer: B
Solution :
KE of rotation\[=1500\] \[\frac{1}{2}I{{\omega }^{2}}=1500\] \[\frac{1}{2}\times 1.2\,{{\omega }^{2}}=1500\] \[{{\omega }^{2}}=\frac{1500\times 2}{1.2}=2500\] \[\omega =\sqrt{2500}\] \[=50\,rad\text{/}s\] From equation of rotational motion \[\omega ={{\omega }_{0}}+\alpha t\] \[50=0+25\times t\] \[\therefore \] \[t=\frac{50}{25}=2\,s\]You need to login to perform this action.
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