2020 大学物理A（Ⅰ）(重庆交通大学) 最新满分章节测试答案

文章目录[隐藏]

Chapter 3 Kinematics in More Dimensions; Vectors (2) Chapter 2~3 Test
Chapter 4 & 5 Dynamics： Newton’s Laws and Application (2) Chapter 4&5 Test
Chapter 9 Linear Momentum and Collisions (3) Chapter 7~9 Test

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本课程起止时间为:2020-03-09到2020-05-23
本篇答案更新状态:已完结

Chapter 3 Kinematics in More Dimensions; Vectors (2) Chapter 2~3 Test

1、问题:Which of the following formulas is true for all types of motion?
选项：
A:
B:
C:
D:
答案: 【】

2、问题:Which of the following ideas is helpful in understanding projectile motion?
选项：
A:Acceleration is +g when the object is rising and -g when falling.
B:The horizontal motion is independent of the vertical motion.
C:The velocity of the object is zero at the top point of parabola.
D:In the absence of friction, the trajectory will depend on the object’s mass as well as its initial velocity and launch angle.
答案: 【The horizontal motion is independent of the vertical motion.】

3、问题:
选项：
A:
B:
C:
D:
答案: 【】

4、问题:If the motional equation of a particle is expressed as , which of the following statement is true?
选项：
A:It is a uniform circular motion.
B:The path is a parabola.
C:The radial acceleration is
D:The speed is v=2t.
答案: 【The speed is v=2t.】

5、问题:If we choose two different reference frames to analyze the motion of an object, the description of motion can be different.
选项：
A:正确
B:错误
答案: 【正确】

6、问题:In 1-dimentional motion, if we know the accelaration of an object, then its velocity can be expressed as:
选项：
A:正确
B:错误
答案: 【错误】
分析：【The accelaration is not necessary to be constant, so we have to use an integral to express velocity.】

7、问题:If a particle has a constant speed, its acceleration equals 0.
选项：
A:正确
B:错误
答案: 【错误】
分析：【If a particle has a constant speed, its tangential acceleration equals 0.】

8、问题:In a circular motion, the acceleration is always perpendicular to the velocity.
选项：
A:正确
B:错误
答案: 【错误】
分析：【Only valid when it is a uniform circular motion.】

9、问题:
答案: 【140】

10、问题:
答案: 【[79.6,80.1]】

11、问题:An object moving in r =100m circle satisfies: , how much is the magnitude of acceleration when t=1s?
答案: 【15】

12、问题:Someone must get directly across a 160m wide river (from A to B) in the minimum time. The river’s current is 0.8m/s, he can row a boat at 1.5m/s, and he can run 3m/s. Try to find the best path he can take, and what is the minimum time for the crossing? t = __ s
答案: 【[123,125]】

Chapter 4 & 5 Dynamics： Newton’s Laws and Application (2) Chapter 4&5 Test

1、问题:A conical pendulum composed of a massless rope (length L) and a bob (mass m) is shown in Figure. How much is the period for the pendulum?
选项：
A:
B:
C:
D:
答案: 【】

2、问题:A mass m slides down along a circular track (radius R) from position A with no friction. When it arrives the position as figure, how much is the normal force N acted by the track?
选项：
A:
B:
C: