Kinematics Question 725
Question: Certain neutron stars are believed to be rotating at about $ 1rev/\sec $ . If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be [NCERT 1982]
Options:
A) $ 20\times 10^{8}m/{{\sec }^{2}} $
B) $ 8\times 10^{5}m/{{\sec }^{2}} $
C) $ 120\times 10^{5}m/{{\sec }^{2}} $
D) $ 4\times 10^{8}m/{{\sec }^{2}} $
Show Answer
Answer:
Correct Answer: B
Solution:
$ a={{\omega }^{2}}r=4{{\pi }^{2}}n^{2}r=4{{\pi }^{2}}\times 1^{2}\times 20\times 10^{3} $ A=$ 8\times 10^{5}\ m/{{\sec }^{2}} $
