A) \[4.2\,cm\]
B) \[2.1\,cm\]
C) \[8.4\,cm\]
D) \[6.3\,cm\]
Correct Answer: C
Solution :
| [c] Let r be the length of pendulum. |
| Length of an \[arc=\frac{\theta }{360{}^\circ }\times 2\pi r\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,8.8=\frac{60{}^\circ }{360{}^\circ }\times 2\times \frac{22}{7}\times r\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,r=\frac{360{}^\circ \times 8.8\times 7}{2\times 22\times 60{}^\circ }=8.4cm\] |
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