(a) A very powerful vacuum cleaner has a hose 2.68 cm in diameter. With the end of the hose placed perpendicularly on the flat face of a brick, what is the weight of the heaviest brick that the cleaner can lift?
(b) An octopus uses one sucker of diameter 2.68 cm on each of the two shells of a clam in an attempt to pull the shells apart. Find the greatest force the octopus can exert on a clamshell in salt water 26.3 m deep.