[填空题]
A bicyclist traveling ;)qo qtbevf1ov4q356r+5 0 wooom bjf with speed v=4.2 ogphia: 7mr-hvi 5s 7pfr7m,t/r7 z3hm/s on a flat road is making a turn with a radius The forces acting on the cyclist and cycle are /v th ho7p azirmhgr:-f 7,i5sm7r7p 3the 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 2025-2-18 20:00:22
