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Kisachek [45]
3 years ago
13

PLEASE HELP!! When a box rests on a round sheet of wood on the ground, it exerts an average pressure p on the wood. If the wood

is replaced by a sheet that has half the diameter of the original piece, what is the new average pressure? I think the answer is 4p but I don't know why.
Physics
1 answer:
valkas [14]3 years ago
4 0
Pressure = Force ÷ Area

In this case, since the area is circular, we can rewrite the equation as:

Pressure = Force ÷ pi*r^2

Decreasing the diameter by half is the same as decreasing the radius by half.

We can replace all constants with 1 to compare the relationship between the two scenarios.

Original scenario with original area wood:

Pressure = 1 ÷ 1^2
Pressure = 1

Scenario with 0.5 radius of original scenario:
Pressure = 1 ÷ (1/2)^2
Pressure = 1 ÷ 1/4
Pressure = 4

This confirms that your guess of 4x the pressure is correct.

So as can be seen by the relationship, pressure for circular area is inversely proportional to the radius squared.


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