上期中双语物理试卷.docVIP

…………试卷装订线 ……………… 装订线内不要答题，不要填写考生信息………………试卷装订线 ………… 姓 名 学 号 专业班级 学院 武汉理工大学考试试卷（期中卷） 2012 ~2013 学年 2 学期 大学物理C（双语） 课程 闭卷 时间120分钟，72 学时，4.5学分，总分100分，占总评成绩70% 2013年5月6日 题号 一 二 三 四 五 六 七 八 九 十 合计 满分 18 18 64 100 得分 一、选择题(本题共18分，每小题3分) 1. A particle of mass m, initially at rest, is accelerated by a force that increases in time as F = Ct2, where C is a constant. Determine its position x as a function of time and the work W by the force from t=0 to t=t. Ans:( ) A.,; B.,; C.,; D., 2. The electric potential at points in an xy plane is given by V= 2x2–3y2 ( V/m2). The electric fieldat point P ( 3m, 2m ) is Ans:( ) A.(V/m); B.( V/m); C.( V/m);D.( V/m) 3. A point charge q is placed at one corner of the cube of edge l, as in Fig.1-1. The total flux through the cube faces is Ans:( ) A. ; B. ; C. ; D. . 4. In Fig.1-2, a rod of length L has charge -q uniformly distributed along its length. Take V=0 at r = ∞, the electric potential V at point P is Ans:( ). A.; B.; C.; D.. 5. Fig.1-3 shows a wire of arbitrary shape carrying a current I between point a and b. The wire in a plane at right angle to a uniform magnetic field B. Then the magnitude of the force on the wire is Ans:( ). A. 0; B. ; C. ; D. . 6. What is the speed of a particle whose kinetic energy is equal to twice of its rest energy? 得分 二、填空题(本题共18分，每空2分) 1. A body moves in a circle of radius 3m with its speed given by v =3t－t3, with υ in meters per second and t in seconds, At t =2s, the tangential acceleration at = . 2. A satellite(卫星) of mass m moves in a circular orbit of radius r around a planet of mass M. The potential energy U of the system is . 3. In Fig.2-1, a wire is formed into a closed circuit with radii a and b, and carries a current i. The magnetic dipole moment(磁矩)of the circuit is . 4. In Fig.2-2, a parallel-plate capacitor