[填空题]
A bicyclist traveling with speed v=4.2m/s on m7bz w.mbl 59fa flat road is mgtrj(b4tlcxqfv3e85 ;u; s t2aking a turn with a radius The forces acting on the cyclist and cycle are the normal force5subl3 x ve4jg; f2tt;tqr8c ( $\left(\mathbf{\vec{F}}_{\mathrm{N}}\right)$ 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
