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?

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

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Physics
A cyclist leans inwards when he is negotiating a curve so that

He may increase his speed
No frictional force may be produced between the wheels and the axle
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
His weight may be reduced

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