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The angular velocity of the earth with which it has to rotate so that acceleration due to gravity on 60o latitude becomes zero is (Radius of earth = 6400 km. At the poles g=10 ms-2)

(a) 2.5 × 10^-3 rad /s (b) 5.0 × 10^-1 rad /s

(c) 10 × 10¹ rad /s (d) 7.8 × 10^-2 rad /s

Answer: a

PrevPrevious62. One quarter sector is cut from a uniform circular disc of radius R. This sector has mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is

NextAssuming earth to be a sphere of a uniform density, what is the value of gravitational acceleration in a mine 100 km below the earth’s surface (Given R = 6400 km)Next

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