Test 3

1、单选题：
‏An object of mass 0.50 kg, hanging from a spring with a spring constant of 8.0 N/m, is set into a simple harmonic motion. What is the maximum speed of the object if its maximum displacement is 0.10 m? ​
选项：
A: 0.20m/s
B: 0.40m/s
C: 0.80m/s
D: 1.60m/s
答案: 【 0.40m/s】

2、单选题：

‌

‏选项：
A: 0.5f
B: 0.707f
C: 1.414f
D: 2f
答案: 【 1.414f】

3、单选题：
​Which of the following statements is NOT necessarily true regarding mechanical waves?‏
选项：
A: They are sinusoidal in nature.
B: They carry energy.
C: They require a medium through which to propagate.
D: The wave speed depends on the properties of the medium in which they travel.
答案: 【 They are sinusoidal in nature.】

4、单选题：

‌

‎选项：
A:
B:
C:
D:
答案: 【 】

5、判断题：
A uniform circular motion on xoy plane can be treated as the superposition of a simple harmonic motion in x direction and another simple harmonic motion in y direction.‎
选项：
A: 正确
B: 错误
答案: 【 正确】

6、判断题：
‎When a wave travels in medium, the particles in medium will oscillate with the same frequency, same amplitude and same phase.‏
选项：
A: 正确
B: 错误
答案: 【 错误】

7、判断题：
‌Consider an interference between two waves. At a certain position if the vibrations caused by two waves are in phase, they make a destructive interference.‌
选项：
A: 正确
B: 错误
答案: 【 错误】

8、填空题：

‍

‌答案: 【 [0.14,0.142]】

9、填空题：

‌

‍答案: 【 [0.39,0.41]】

10、填空题：

​

‌答案: 【 1.9】

Chapter 1~3 Test

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