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Question

A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. The pressure exerted by the box will be:

A
maximum when length and breadth form the base
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B
maximum when breadth and width form the base
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C
maximum when width and length form the base
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D
the same in all the above three cases
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Solution

The correct option is B maximum when breadth and width form the base
The force exerted by the box on base=Weight of object=W
The pressure that it exerts on the base=WA
where A is the area of the base.
Hence the pressure is maximum for smallest area of the base, which is when formed by breadth and width.

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