Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of adhesion are large
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them

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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
His weight may be reduced
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

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