A) 4 seconds
B) 2 seconds
C) 8 seconds
D) 10 seconds
Correct Answer: B
Solution :
[b] \[I=1.2\,kg\,{{m}^{2}},\,{{E}_{r}}=1500J,\] \[\alpha =25rad/{{\sec }^{2}},\,\,\,{{\omega }_{1}}=0,\,t=?\] \[As\,{{E}_{r}}=\frac{1}{2}I{{\omega }^{2}},\,\omega =\sqrt{\frac{2{{E}_{r}}}{I}}\] \[=\sqrt{\frac{2\times 1500}{1.2}}=50rad/\sec \] \[From\,{{\omega }_{2}}={{\omega }_{1}}+\alpha t\] \[50=0+25t,\text{ }t=2\]secondsYou need to login to perform this action.
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