Aperson's eardrum has an area of
0.000200 m^2. how much force
does the outside air, at 1.00 atm,
exert on the eardrum?

Since we have

where P is the pression, F is the force and S is the surface, we can solve the formula for the force as follows

In order to have consistent units of measure, we convert

and we plug the values:

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

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