2008—2009学年第一学期《力学》(双语)课程考试试卷(A卷).doc

2008─2009 学年 第一学期 《力学》(双语)课程考试试卷(A卷) 专业：物理学 年级：07级 考试方式: 闭卷 学分:4 考试时间：120 分钟 题号 一 二 三 四 五 六 总分 得分 阅卷人 得分 一、 Fill in the blanks (2 (10=20 marks) 1. Vectors and have magnitudes of 3 units and 4 units, respectively, if , the angle between the directions of and is ( ). 2. If no net force acts on a body, the body’s velocity ( ). 3. A generator at one end of a very long string creates a wave given by The wavelength of the wave is ( ); the speed of the wave is ( ). 4. The kinetic energy of a rolling body is written as K=( ). 5. Write down Newton’s second law in angular form ( ). 6. The ( ) of a system of particles is the point that moves as though all of the system’s mass were concentrated there. 7. The rotational inertia of a body about an axis 1 that extends through the body’s center of mass is I1, the mass of the body is m, an axis 2 is parallel to axis 1 and the perpendicular distance between the two axis is h, then the rotational inertia I2 about axis 2 is ( ). 8. The net work done by a conservative force on a particle moving around any closed path is ( ). 9. A particle with mass m that moves under the influence of a Hooker’s law restoring force given by F=-kx exhibits simple harmonic motion with the angular frequency =( ). 10. The equation of continuity for the flow of an ideal fluid is expressed as ( ). 阅卷人 得分 二、Choose the Correct Answer (3(10=30 marks) 1. A particle moves along the x-axis subject to the following position function: What was its average velocity during the interval t=0 to t=3s? A. 9.0m/s B. 8.3m/s C. 5m/s D. 3.3m/s ( ) 2. As shown in Fig.1, a chain consisting of five links, each of mass 0.100 kg, is lifted vertically with constant acceler