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Physics

Two satellites S₁ and S₂ revolve round a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1 hour and 8 hours respectively. The radius of the orbit of S₁ = 10⁴ km. When S₂ is closest to S₁, find
(a) speed of S₂ relative to S₁ and
(b) the angular speed of S₂ actually observed by an astronaut in S₁.

Chemistry

Increasing/Decreasing Characteristics

1.

Increasing acidic property

ZnO, Na₂O₂, P₂O₅, MgO

Mathematics

Fill in the blank :

Let

be a real valued function. Then the set of points where f(x) is not differentiable is ................

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