[填空题]
A bicyclist traveling tlcitpgu 6sr b)e .u*j-)2 la ;otm1wxm 1m46dwith speed v=4.2m/s on a flat road is making a turn a6ih 3x: l/3crt4jm/l kuy/ 3vmiyak*with a radius The forces acting on the cyclist and c3c4iir*hjlla3 yx yma kv3k /t//m:6uycle 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
