[填空题]
A bicyclist traveling with speed v=4.2m/s on a flat rzi:c /qgi1*c6fazxb. oad is maki/uha2hta s . al7 xyfhfpu:w b,-4bpk.9y1l r/ng a turn with a radius The forces acting on the cyclist and cycle are the normal f k9uay/s tha .b2uf/xyp4 f7,h.lw-1bhpr l:a orce $\left(\mathbf{\vec{F}}_{\mathrm{N}}\right)$ 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
