A) 2 s
B) 4 s
C) 8s
D) 10s
Correct Answer: A
Solution :
Rotational kinetic energy\[=\frac{1}{2}I{{W}^{2}}=1500\] \[\Rightarrow \] \[\frac{1}{2}I{{(\alpha t)}^{2}}=1500\] \[\Rightarrow \] \[(1.2){{(25)}^{2}}\times {{t}^{2}}=3000\] \[\Rightarrow \] \[1.2\times 625\times {{t}^{2}}=3000\] \[\Rightarrow \] \[{{t}^{2}}=\frac{3000}{1.2\times 625}=4\] \[t=2s\]You need to login to perform this action.
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