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What is the period of revolution of the earth satellite? Ignore the height of satellite above the surface of the earth. Given, (1) The value of gravitational acceleration, g = 10 m/s 2. (2) Radius of the earth, RE = 6400 km (take, π = 3.14)
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Charges + 2q, + q and +q are placed at the corners A ,B and C of an equilateral triangle ABC. If E is the electric field at the circumcentre O of the triangle, due to the charge +q, then the magnitude and direction of the resultant electric field at O is
A stationary point source of sound emits sound uniformly in all directions in a non-absorbing medium. Two points P and Q are at a distance of 4 m and 9 m respectively from the source.
The ratio of amplitudes of the waves at P and Q is
The charge on the capacitor of capacitance C shown in the figure below will be
In the given circuit, a charge of + 80 µC is given to the upper plate of the 4 µF capacitor. Then, in the steady state, the charge on the upper plate of the 3 µF capacitor is
If the bisector of the angle P of a triangle PQR meets QR in S, then
If in a ∆ ABC, a = 15, b = 36, c = 39, then sin C/2 is equal to
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