2015理论力学静力学期末英文试卷

2015理论力学静力学期末英文试卷 期末考试理论力学模拟考卷 Cautions:?This test paper is about Theoretical Mechanics,and you have 75 mins to finish this part. ?Reassure that each question and every sketch are answered in the right area. ?The unit of length in this test is always millimeter unless special announcement. Part I Theoretical Mechanics(100 points) 1.(12 points) Hydraulic clamping refers to machine quick clamping device with hydraulic as power, which can be realized on a work-piece clamping action quick, saving a lot of manpower and time.It can be simplified as the following picture(题1图).We’ve known that the structure remains equilibrium.And F is a given constant.Find the holding power acted by H to E.(B,C,E are movable hinges,D is hinge.) 姓 名 : 题1图 学2.(12 points) 号Here is a still system consisting of two weightless beams connecting with each other at point C,Now external force :F,uniformly distributed force Q,a couple are given,please find out the reactions at point A,B,C.(Everything shown on the graph is given) qFM B, CDAa/2a/2a 题2图 班 级 : 3.(10 points) An separated airfoil where a engine is set on it is shown as the following graph.There is a air force acting on it distributing in the shape of ladder-shaped,and q=60KN/m,q=40KN/m,the gravity of the airfoil P=45KN,engine weighs P=20KN,and 1212a couple whose magnitude is 18KN`m.So please figure the forces acting on point O. 题3图 第 1 页 共 1 页 期末考试理论力学模拟考卷 4.(11 points) Everything is frictionless,weightless,so please find the reactions about point A,D,B.(F is applied force.) 题4图 5.(12 points) A truss is here,and please find the internal forces of beam 1,2,3. 题5图 6.(13 points) Here is a ladder weighed 200N,and its length is l,the angle between the ground is 60?.The coefficient of still friction is 0.25,now a man whose gravity is 650N go along the ladder,find the maximum distance between C where man can go the most high and A. 题6图 7.(15 points)A truss is here,and please find the internal forces of beam 1,2,3. 题7图 8.Filling Blanks(15 points) z [1]An conplanar for system is reduced to point A、B、C、D，only when it reduces to point c,its Bwhole moment is 0.Thus its resultant must pass through point . FA [2]Find the moment of F about y-axis=__________if the side length of the cubic is a. O y 第 2 页 共 2 页 x 期末考试理论力学模拟考卷 [3]_______forces won’t change the motion of particle,only_______forces do.(fill the kinds of force) 第 3 页 共 3 页