Question
You are pumping up a bicycle tire with a hand pump, the piston of which has a 2.00-cm radius. (a) What force in newtons must you exert to create a pressure of $6.90 \times 10^5 \textrm{ Pa}$ (b) What is unreasonable about this (a) result? (c) Which premises are unreasonable or inconsistent?
1. $867 \textrm{ N}$
2. The force requires all the weight of an 88 kg person. This is not reasonable.
3. The radius of the pump cylinder is too large.
Solution Video