Question

Review | Constants Learning Goal: To practice Problem Solving Strategy 8.1 for circular-motion problems A cyclist competes in a one-lap race around a flat, circular course of radius 140 m. Starting from rest and speeding up at a constant rate throughout the race, the cyclist covers the entire course in 60 s The mass of the bicycle (including the rider) is 76 kg What is the magnitude of the net force Fnet acting on the bicycle as it crosses the finish line? Which of the following sets of rtz coordinate axes is the most appropriate for this problem? The black dot represents the bicycle + rider at an arbitrary instant during the race. ali N

Answer 1

Given, R=140m ,t=605, M376 kg. we know, I lap = l revolution = 2TY- 1 ..From, s=ut + į at? &T.R=0 o+ 1 6 a (60)2 2T (140) = 1800 a a= 7T - 0.489 45 From V= utat FO +0.489)60 V=29.32 mis. i, Fnet = mye 76(29-32) r 140 :. Fret = 466.72 N & In diogram, t- always acts wise direction in anti clock Z Fret = 466*72N cs