A) 42 min
B) 1 day
C) 1 h
D) 84.6 min
Correct Answer: D
Solution :
The radius of earth = 6400km Hence, the time period is \[T=2\pi \sqrt{\frac{6400\times 1000}{10}}=2\pi \sqrt{640000}\] \[=2\pi \times 800\] \[=1600\,\pi \,s\] \[\simeq 84.6\,\,\min \]
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