2, Given that y₁=e^x is a  sohifiott of y''-y=  0 on [-oo,oo], use reduction of order to find a second solution y₂,

沒有 【段考】高二數學上學期 權限，請先開通．

沒有 【段考】高二數學上學期 權限，請先開通．

(a) Is the differential equation exact?

(b) Find the general solution?

【已刪除】3. 

【已刪除】4. Solve by using the Laplace Transform.

【已刪除】1. A gable frame is subjected to a wind loading，as shown in Fig. 1. Determine the reactions at its supports due to the loading. (25%)

【已刪除】2. The landing gear shown in Fig. 2 consists of the bent member ABCD and the two supports CE and CF, which are two force members. Points D, E, and F connect to the fuselage. Point A receives the loads from the wheel. The connection at D can resist forces in all directions but only a torsion about BCD axis. Neglect the weight of the landing gear，calculate the forces in members CE and CF，Nqe and Ncv . (25%)

【已刪除】3. The spring has an unstretched length of 0.4 m and a stiffness of 200 N/m. The 3-kg slider and attached spring are released from rest at A and move in the vertical plane. Calculate the velocity v of the slider as it reaches B in the absence of friction. (25%)

【已刪除】4. Ajet-engine noise suppressor consists of a movable duct that is secured directly behind the jet exhaust by cable A and deflects the blast directly upward. During a ground test, the engine sucks in air at the rate of 43 kg/s and bums fuel at the rate of 0.8 kg/s. The exhaust velocity is 720 m/s. Determine the tension T in the cable. (25%)