Topic: What are the problem solving steps
May 22, 2019 / By Jordi Question:
I need step by step instructions. I HATE it when the book uses cm2 or cm3 and it's doing it again for this problem, someone please give me the steps so I can solve it please.
The problem reads:
If the surface area ofa human hand is 25.5 in2, what is the total weight of the atmosphere ona human hand in pounds?
Genya | 5 days ago
Depends on the elevation, since atmospheric pressure does
vary with elevation. At sea level, standard atmospheric
pressure is about 14.7 pounds per square inch.
If the hand has a surface area of 25.5 square inches, the
total weight on it is 14.7 times 25.5, or 374.85 pounds.
At higher elevations, atmospheric pressure is less, so the
total weight of air on the hand is proportionately less.
Hope this answers your question.
You will have some information such as "Atmospheric pressure is 14.7 pounds weight per in2"
Then 14.7 pounds weight per in2 x 25.5 in2 = 374.85 (375 to three sig figs) pounds weight in total.
Just like say 14.7 dollars per bag of rice x 25.5 bags would be 14.7 x 25.5 = 374.85 dollars, or 375 dollars to three sig figs.
this is called "unit conversion" and you don't even NEED to understand what the units mean: But it is better if you do.
My hand is about 6 inches long and 4 1/2 inches wide. So its area is just (6 x 4 1/2) in2 or 27 in2.
Some advice: get some graph paper and play around with drawing areas on it. Imagine buying tiles to cover a floor. If you are taking this course in a class, discuss it with your colleagues.