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  • A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the brick will be (a) maximum when length and breadth form the base (b) maximum when breadth and width form the

A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the brick will be

(a) maximum when length and breadth form the base

(b) maximum when breadth and width form the base

(c) maximum when width and length form the base

(d) the same in all the above three cases

Answers (1)

B

Sol.

The pressure is defined as normal force per unit area.

Force applied by box will be equal to weight of the box in all orientations.

Therefore, pressure exerted by it will be inversely proportional to the area.

To maximize the value of pressure, we have to decrease the surface area.

The least surface area will be in the case when breadth and width form the base.

Correct answer is option B.

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infoexpert24

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