Physics
Two rods, one of copper and other of steel, experience the same upthrust when placed in water.Thus, both have

Equal density
Equal weight
Equal volume
Equal mass

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Physics
Railway tracks are banked on curves so that

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
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards

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