It is always a good idea to understand the \"size\" of units. The objects listed

Question

It is always a good idea to understand the "size" of units. The objects listed below are resting on a hard surface. Categorize each object according to the pressure it exerts on the surface when placed on their side with the largest area, which is the bottom. Assume that the bottom of each object is flat and that the pressure refers to that above atmospheric pressure (that is, gauge pressure)

sheet of paper, penny, can of soup, textbook, brick

0.01pa, 0.1pa, 1pa, 10pa, 100pa, 1000pa, 10000pa, 100000pa

Explanation / Answer

a) Area of a sheet of paper (A4) = 0.297*0.21 m^2 = 0.06237 m^2

Weight of a paper = 4.5*10^-3 N

Pressure = weight/area ~ 0.1 Pa

b) Area of a penny = 2.8353*10^-4 m^2

Weight = 2.5*10^-3 N

Pressure ~ 10 Pa

c) Area of a can of soup (dia 3 in) = 4.56*10^-3 m^2

Weight = 0.3 N

Pressure ~ 100 Pa

d) Area of a textbook = 0.06237 m^2

Weight = 0.25 N

Pressure ~ 10 Pa

e) Area of a brick = 0.0252 m^2

Weight = 2.75 N

Pressure ~ 100 Pa

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