西安交大考試卷（理論力學(xué)英文）-

1、課程名稱 理論力學(xué)A1(英 2003 2004學(xué)年第 1 學(xué)期 學(xué) 號 開 課 系 工程力學(xué)系 年級 本科二年級 姓 名 任課老師 柳葆生 評分 規(guī)定:僅允許攜帶電子詞典、計(jì)算器和教師提供的課程總結(jié)1. Member BD exerts on member ABC a force P directed along line BD.Knowing that P must have a 360-N vertical component, determine (a the magnitude of the force P, (b its horizontal component. (零件BD 對零件

2、ABC 沿BD 線施加一個(gè)力P ,已知P 的垂直分量為360-N ,計(jì)算(a 力P 的大小,(b 力P 的水平分量 2. Two forces P and Q are applied as shown to an aircraft connection. Knowing that the connection is in equilibrium and that P = 250 N and Q = 325 N, determined the magnitude of the forces exerted on the rods A and B. (如圖所示,兩個(gè)力P 和Q 施加于一個(gè)飛機(jī)連接器

3、。已知連接器處于平衡狀態(tài),并且P = 250 N 和Q = 325 N ,確定施加于連桿A 和B 上力的大小3. A 150 N force, acting in a vertical plane parallel to the yz plane, isapplied to the 200 mm long horizontal handle AB of a socket wrench. Replace the force with a equivalent force-couple system at the origin Oof the coordinate system. (一個(gè)150 N

4、 的力,作用在平行于yz 平面的垂直平面內(nèi),施加于一個(gè)套筒扳手200 mm 長的水平手柄上。用一個(gè)在坐標(biāo)原點(diǎn)O 的等效力-力偶系統(tǒng)代替這一力 4. Knowing that the tension in wire BD is 1500 N, determine thereaction at the fixed support C of the frame shown. (已知拉索BD 中的張力為1500 N ,確定如圖示在框架固定支撐端C 的約束反力5. Determine the forces in each member of the truss shown. State whethere

5、ach member is in tension or compression. (確定圖示桁架中每個(gè)桿件中的 力。說明每個(gè)桿件受拉力或壓縮力6. A uniform crate of mass 30 kg must be moved up along the 15ºincline without tipping. Knowing that the force P is horizontal, determine (a the largest allowable coefficient of static friction betweenthe crate and the incli

6、ne, (b the corresponding magnitude of the force P.(一個(gè)勻質(zhì)的30 kg 貨箱必須被沿15º斜面上移,并不發(fā)生傾翻。已知力P 為水平方向,確定:(a 在貨箱和斜面間所允許的最大靜摩擦系數(shù),(b 相對應(yīng)力P 的大小7. The acceleration of a point P moving in a plane is given by j 5t 4(i t 3a 2r r r +=2s /m , where t is the time in seconds. When t = 2, the position and velocity

7、are respectively j 33.26i 12(r r +m and j 21i 10r r +s /m . Determine the position and velocity at t = 1. (點(diǎn)P 在平面中移動(dòng),其加速度表達(dá)式為j 5t 4(i t 3a 2r r r +=2s /m ,其中t 為以秒為單位的時(shí)間。當(dāng)t = 2, 其位移和速度分別為j 33.26i 12(r r +m 和 j 21i 10r r +s /m ,確定t = 1時(shí)的位移和速度8. A car leaves a motorway at point A with a speed of 100km/h and slows down at a uniform rate. Five seconds later,as it passes B, its speed is 50 km/h (see Figure. The radiusof curvature of the exit road at B is 110 m. The mass of thecar is 1500 kg. Find (a the acceleration of the car at B and(b the total force exerted b