Physics
Which is best used as a sound absorbing material in partition walls ?

Stone chips
Glass pieces
Glass - wool
Steel

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Physics
Railway tracks are banked on curves so that

The train may not fall down inwards
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train

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