A fly was sitting on a block. A man draws a circle of area ${2 c m}^{2}$ , thus 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 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.
${2 c m}^{2}$ = 2 $\times$ $10^{- 4}$ $m^{2}$ .
So, pressure = $\frac{F o r c e}{A r e a}$ = $\frac{20}{2 \times 10^{- 4}}$ = $10^{5}$ Pa.

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A fly was sitting on a block. A man draws a circle of area 2cm2, thus 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 calculated is 2cm2, and the force applied by the stick is 20N in order to kill the fly sitting in that area. 2cm2 = 2 × 10−4 m2. So, pressure = ForceArea = 202×10−4 = 105 Pa.

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