Aglass bottle of soda is sealed with a screw cap. the
absolute pressure of the carbon dioxide inside the bottle
is1.80*105 pa. assuming that the top and bottomsurfaces
of the cap each have an area of 4.10*10-4m2,
obtain the magnitude of the force that the screwthread exerts on
the cap in order to keep it on the bottle. the air pressure outside
the bottle is one atmosphere.

Iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

What is a good example of instantaneous speed

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?