A bottle has an opening of radius a and length b. A cork of length b and radius (a+Δa), where (Δa<<a), is compressed to fit into the opening completely. If the bulk modulus of cork is B and the frictional coefficient between the bottle and cork is μ, then the force needed to push the cork into the bottle is:<p></p>

A bottle has an opening of radius a and length b. A cork of length b and radius (a+Δa), where (Δa<<a), is compressed to fit into the opening completely. If the bulk modulus of cork is B and the frictional coefficient between the bottle and cork is μ, then the force needed to push the cork into the bottle is:

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