At the surface of the earth, the time period of a pendulum is T1 and at a height of distance K above earth's surface is T2, then T1/T2=?

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moment of inertia of a equilateral triangle about an axis passing through centre and perppendicular to the plane

. Because of the rotation of the earth, a plumb bob may not hang exactly along the direction of
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The phase of particle at t is 70°and another particle is at t is 790° what is wavelength if the distance between two particles is1 m