2020 大学物理（一）(河北工业大学) 最新满分章节测试答案

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本课程起止时间为:2020-03-16到2020-08-01
本篇答案更新状态:已完结

Chapter 3 Kinematics in More Dimensions; Vectors (2) Chapter 1~3 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:An object moving in r =100m circle satisfies: , how much is the magnitude of acceleration when t=1s?  
答案: 【15】

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

1、 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:
D:
答案: 【】

2、 问题:A person stands on a bathroom scale in an elevator. When the scale reads only 75% of the person’s regular weight, he claims that the elevator must be moving downward. Is he right?
选项：
A:正确
B:错误
答案: 【错误】

3、 问题:Newton’s laws can be used in any reference frame.
选项：
A:正确
B:错误
答案: 【错误】
分析：【They are only valid in inertial frames.】

4、 问题:A small block of mass m is released on a triangular block of mass M. If at the same time a force  is applied to M, m remains rest relative to M. (Assuming all surfaces are frictionless)
选项：