a person who weighs 625 N is riding a 98N mountain bike. suppose the entire weight of the rider and bike is supported equally by the two tires. if the gauge pressure in each tire is 7.60*10^5 Pa, what is the area of contact between each tire and the ground?
鈾?the weight on per each tire is w=(625+98)/2 =361.5 N;
and the pressure on ground is p=w/A, where A is area in question;
鈾?the pressure on ground p corresponds to that measured with gauge in the tyre, that is 7.6路10^5 Pa, hence A=w/p = 361.5 / 7.6路10^5 =0.000476 m^2 =4.76 cm^2; |
