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Questions  

The acceleration due to gravity at the poles and the equator is gp and ge respectively. If the earth is a sphere of radius RE and rotating about its axis with angular speed
ω, then gp-ge is given by

a
ω2RE
b
ω2RE2
c
ω2RE2
d
ω2RE

detailed solution

Correct option is D

Acceleration due to gravity at a place of latitude λ due to the rotation of earth isg' = g-REω2cos2λAt equator, λ = 00, cos00 = 1∴ g' =ge =g-Rgω2At poles, λ = 90°, cos 90° = 0∴ g' = gp =g∴ gp-ge = g-(g-REω2) = REω2

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If R is the radius of earth, ω is its angular velocity and gp is the value of acceleration due to gravity at the poles, then effective value of acceleration due to gravity at the latitude λ=60 will be equal to


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