Physics
The height of a geo-stationary satellite from the Earth's surface is approximately :

None of these
36,000 km
42,000 km
30,000 km

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

None
The liquid surface falls down only at the center of the tank
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The surface of the liquid remains horizontal

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Physics
Railway tracks are banked on curves

the train may not fly off in the opposite direction
to avoid frictional force between the tracks and wheels
necessary centrifugal force may be obtained from the horizontal component weight of the train
necessary centripetal force may be obtained from the horizontal component of the weight of the train

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