申論題

3. A 3 Mg four-wheel-drive vehicle in Fig. 3 has a cer enter of ma: f mass at G. Determine the maximum mass of the log that can be towed. The coefficient of static friction between the log and the ground isμs = 0.8, and the coefficient of static friction between the wheels and ground is μs' = 0.4, Assume the vehicle is powerful enough to slip. [30%]