[填空题]
A bicyclist travelin yyaky c*1zns.,y kld 2jtoa4r (80k;stmmxp* (-rrwe:r ;,nb5yxg5 hyvi 8/mg with speed v=4.2m/s on a flat road is making a turn with a radius The forces acting on tryme;m 58mirnb:( -y x twgh*rx5v/p,he cyclist and cycle are the normal force $\left(\mathbf{\vec{F}}_{\mathrm{N}}\right)$ and friction force $\left(\mathbf{\vec{F}}_{\mathbf{fr}}\right)$ exerted by the road on the tires, and $m\vec{\mathbf{g}}$ the total weight of the cyclist and cycle (see Fig. 8–56). (a) Explain carefully why the angle $\theta$ the bicycle makes with the vertical (Fig. 8–56) must be given by tan $\tan\theta=F_{\mathrm{fr}}/F_{\mathrm{N}}$ if the cyclist is to maintain balance.(round to the nearest integer) (b) Calculate $\theta$ for the values given. $^{\circ} $ (c) If the coefficient of static friction between tires and road is $\mu_s=0.70$ what is the minimum turning radius? m
Post time 2025-3-3 09:18:36
