On a mountain biking trip, a group of riders had a big discussion about tire pre

Question

On a mountain biking trip, a group of riders had a big discussion about tire pressure. The most experienced rider in the group let out some air in his tires before the descent. Why would he want the tire pressure to be lower on the descent and higher during the climb? Explain om a few complete sentences. The air pressure in a bicycle tire is 32 psi on a typical winter day (40 degree F). Assuming the volume of air in the tire remains constant, find the pressure difference that occurs between typical summer (80 degree F) and winter day. Discuss the forces that are responsible for supporting the tire and the bicycle when a rider is on the bicycle. Near the end of the ride, a rider noticed her bike tire was looked flat. The gage pressure read 10 psi, if the local atmospheric pressure is 12.6 psi, determine the absolute pressure in the tire. Report the answer in pascals.

Explanation / Answer

a. because when the rides has lower pressure, it causes higher force of friction, that goes opposite to the direction of moving, that makes you slow, when the experienced rider goes down he wants less speed so he doesnt got to use a lot his break, and when he goes high, the rides need to have a lot of preassure, so the friction force is less and he can accelerate more easily

b. we use this: PV=nRT the relation V/n is the same so R=10.73

V/n=RT/P = 10.73x (40+459) / 32 = 167.321

(RT)/(V/n)=P= (( 459+80) x 10.73) / 167.321 = 34.5651 psi

different of preassure= 32-34.5651=2.56512 psi, the force that support the tire is the preassure the tire feels, with its area, so the weigth of the rider goes opposite to this preassure force

c. 10+12.6= 22.6 psi is the ab preassure, in pascals is 155821.51 Pa

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