A) Zero
B) \[\frac{\pi }{30\sqrt{2}}cm/\sec \]
C) \[\frac{\pi }{30}cm/\sec \]
D) \[\frac{\pi \sqrt{2}}{30}cm/\sec \]
Correct Answer: D
Solution :
In 15 second's hand rotate through\[90{}^\circ \]. Change in velocity \[\left| \overrightarrow{\Delta v} \right|=2v\sin (\theta /2)\] \[=2(r\omega )\sin (90{}^\circ /2)\]\[=2\times 1\times \frac{2\pi }{T}\times \frac{1}{\sqrt{2}}\] \[=\frac{4\pi }{60\sqrt{2}}=\frac{\pi \sqrt{2}}{30}\frac{cm}{\sec }\] [As T = 60 sec]You need to login to perform this action.
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