A) \[4.0\times {{10}^{6}}Nm\]
B) \[2.0\times {{10}^{5}}Nm\]
C) \[1.6\times {{10}^{5}}Nm\]
D) \[7.9\times {{10}^{6}}\text{ }Nm\]
Correct Answer: B
Solution :
\[\alpha =\frac{\Delta \omega }{\Delta t}=\frac{25\times 2\pi }{5}=10\pi \,rad/{{\sec }^{2}}\] \[\tau =\left( \frac{5}{4}M{{R}^{2}} \right)\alpha \] \[=\frac{5}{4}\times 5\times {{10}^{-3}}\times {{({{10}^{-2}})}^{2}}\times 10\pi \] \[=1.9625\times {{10}^{-5}}Nm\] \[\simeq 2.0\times {{10}^{-5}}Nm\]You need to login to perform this action.
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