大学MOOC 大学物理A（Ⅰ）(重庆交通大学)1454735163 最新慕课完整章节测试答案

Chapter2~3Test

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

2、单选题：
‏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、单选题：

​

‌选项：
A:
B:
C:
D:
答案: 【 】

4、单选题：

​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、判断题：
‌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、判断题：

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