A)
B) \[\pi /2\]
C) \[\pi /6\]
D) \[\pi /8\]
Correct Answer: B
Solution :
\[n=900\,\,rpm=\frac{900}{60}rps=15\,\,rps\] \[\therefore \] \[t=1\min =60s\] From equation of angular motion, we have \[\omega ={{\omega }_{0}}-\alpha t\] \[\therefore \] \[\omega =2\pi n-\alpha t\] \[\Rightarrow \] \[0=2\pi (15)-\alpha (60)\] \[\Rightarrow \] \[\alpha =\frac{30\pi }{60}=\frac{\pi }{2}rad/{{s}^{2}}\] \[\pi /4\]
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