Physics
A piece of wood is held under water. The upthrust on it will be:

Zero
Equal to the weight of the wood
More than weight of the wood
Less than weight of the wood

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

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

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