A piece of paper that fits snugly against the sides of an inverted glass of water prevents the water from spilling out.

A piece of paper that fits snugly against the sides of an inverted glass of water prevents the water from spilling out. What is the force of air pressure on water if the leaf area is 0.02 m2? (Atmospheric pressure 105 Pa)

Since there is an obvious error in the condition of the problem, the solution of the problem will be taking into account the atmospheric pressure equal to 105 kPa.

Given:

s = 0.02 square meters – surface area of a sheet of paper;

P = 105 kPa = 105000 Pascal – atmospheric pressure.

It is required to determine F (Newton) – the force of air pressure.

To determine the strength of air pressure, you must use the following formula:

F = P / s;

F = 105000 / 0.02 = 5250000 Newton = 5.25 MN.

Answer: air presses on a sheet of paper with a force equal to 525,000 Newtons (5.25 MN).