A fly was sitting on a block. A man draws a circle of the area ${2 c m}^{2}$ , enclosing the fly. He then applies a force of 20N and kills it with a flat stick. Calculate the pressure on that area.

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Solution

The correct option is C
Pa

The area on which the pressure is to be calculated is ${2 c m}^{2}$ , and the force applied by the stick is 20N in order to kill the fly sitting in that area.
Hence, pressure(P) = $\frac{F o r c e}{A r e a}$ .
where, ${2 c m}^{2} = 2 \times 10^{- 4} m^{2}$ .
$∴ P = \frac{20}{2 \times 10^{- 4}}$
$= 10^{5} P a$ .

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A fly was sitting on a block. A man draws a circle of the area 2cm2, enclosing the fly. He then applies a force of 20N and kills it with a flat stick. Calculate the pressure on that area.

The correct option is C Pa The area on which the pressure is to be calculated is 2cm2, and the force applied by the stick is 20N in order to kill the fly sitting in that area. Hence, pressure(P) = ForceArea. where, 2cm2=2×10−4m2. ∴P=202×10−4 =105Pa.

A fly was sitting on a block. A man draws a circle of the area ${2 c m}^{2}$ , enclosing the fly. He then applies a force of 20N and kills it with a flat stick. Calculate the pressure on that area.