Question

Soft board pin of head area 1000 times that of the tip. Calculate the ratio of pressure ,if F thrust is applied on the top of the pin.

Answer 1

Given : Soft board pin of head area 1000 times that of the tip. Thrust applied on the top of the pin is F.

To find : The ratio of their pressures.

solution : as it is given that Soft board pin of head area 1000 times that of the tip.

let area of the tip is A

so area of head of the soft board = 1000A

now pressure exerted by the tip , P₁ = F/A

and pressure exerted by the head of soft board pin , P₂ = F/1000A

now ratio of their pressures = pressure exerted by the head of soft board/pressure exerted by the tip = P₂/P₁ = (F/1000A)/(F/A) = 1 : 1000

Therefore the ratio of pressures is 1 : 1000.

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Answer 2

Answer:

:

Here, A=0.2mmsq

=0.2×0.2sqmm=0.04×10−6m2

F=5kgwt=5×10N

Pressure ,P=FA=5×100.04×10−6=1.25×109Pa

Explanation:

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