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Q.

A body weight 49 N is on spring balance at the north pole. What will be its weight recorded on the same weighing machine, if it is shifted to the equator?

Use  g=GMR2=9.8 ms−2   and   radius  of  earth,  R=6400  km

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a

49 N

b

49.17 N

c

49.83 N

d

48.83 N

answer is D.

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Detailed Solution

At pole, there is no effect of rotation of earth, ​∴mg=49 N​⇒m=499.8=5kg​At equator, ​Apparent Weight =mg−ω2R=59.8−2π24×360026400×103=48.83N

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