Physics
Railway tracks are banked on curves

to avoid frictional force between the tracks and wheels
the train may not fly off in the opposite direction
necessary centripetal force may be obtained from the horizontal component of the weight of the train
necessary centrifugal force may be obtained from the horizontal component weight of the train

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Physics
The nature of fuse wire is

High resistance and low melting point.
Low resistance and low melting point.
High resistance and high melting point.
Low resistance and high melting point.

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail

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