(a) Determine the principal stresses and show a sketch of the element oriented with principal stresses acting on it

三、試說明何謂政黨?政黨在我國憲法上之地位如何？政黨與政治圃 雠有何差異？現行法律對政黨之成立有何規範？ (25%)

四、試分析我國憲法上有關中央與地方權限劃分之規定有何問題？全 民健康保險法中規定地方自治團體應負補助保險費之義務，是否侵犯 地方自治團體之權限？（25%)

【已刪除】1 (30%) The low-bed trailer (拖車）shown is designed so that the rear end of the bed can be lowered to ground level in order to facilitate the loading of wrecked vehicles (使易於放下廢車)A 1500 kg vehicle has been hauled (拖運）to the position shown by a winch (絞車)；the trailer is then returned to a traveling position where a = 0 and both AB and BE arc horizontal. Considering the weight of the disabled automobile (廢車)， determine the force which must be exerted by the hydraulic cylinder of CD to maintain a position with a = 0.

2. (35%) A centrifugal clutch (離心式離合器）shown has a constant angular velocity of 3000 rpm. Thin curved members AB and CD are connected by pins at A and C to the arm AC which rotates about a fixed point O. Each of the members AB and CD has a mass of 5 g and a radius of 10 inch. As the clutch rotates counterclockwise, two knobs located 30。slide on the inside of a fixed cylindrical surface of radius 11 mm with the coefficient of kinetic Ihction is 0.35. Determine the couple M which must be applied to arm AC. Hint： The distance from the centroid (質量中心）of curved members AB (or CD) to the fixed point O is 7.379 mm.

(b) Determine the maximum stresses and show them on a sketch of a properly oriented element.

【已刪除】1. A rigid horizontal bar is supported by a hinge al A and by two steel cables BD and CE, which are of equal length L = 0.8 m，cross-sectional area A = 140 mm2, and E ~ 200 GPa. Please calculate the stress in each cable due to a force of 40 kN, applied as shown in Figure I. (20%)

【已刪除】2. Please determine the reactions RAx，RAy, RBy，REy and Rf y of the cantilever structure as shown in Figure 2. (20%)

【已刪除】3. Please draw the shear and moment diagrams for the beam sliown in Figure 3. (20%)

【已刪除】4. The 200-kg glider B is being towed by airplane A, which is flying horizontally with a constant speed of 220 km/h. The low cable has a length r = 60 m and may be assumed to form a straight line. The glider is gaining altitude and when θ reaches 15°, the angle is increasing at the constant rate θ•=5 deg/s. At the same time the tension in the tow cable is 1520 N for this position. Please calculate the aerodynamic lift L and drag D acting on the glider. (20%)

(a) the speed vb of the slider as it passes position B and