2022 College Physics II(Dalian University of Technology)1468336443 最新满分章节测试答案

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本课程起止时间为:2022-09-05到2022-12-30

01 Periodic Motion Unit Test 1

1、 问题:A mass of 0.20 kg , hung from a spring with a spring constant of 80.0 N/m  , is set into an up-and-down simple harmonic motion. If the mass is displaced from equilibrium by 0.10 m and released from rest, what is its speed when moving through the equilibrium point?
选项：
A:0
B:1.4 m/s
C:2.0 m/s
D:3.4 m/s
答案: 【2.0 m/s】

2、 问题:The Fig.  is the  v ( t ) curve for an object undergoing SHM. Which of the following is the oscillating function x ( t ) for the object?
选项：
A:
B:
C:
D:
答案: 【】

3、 问题:A mass m attached to a vertical spring (with spring constant k ) is released from rest from the relaxed position of the spring. What is the amplitude of the resulting oscillation?
选项：
A:
B:
C:
D:
答案: 【】

4、 问题:A mass hanging on a spring oscillates vertically. If the equilibrium point of the oscillation is a distance d below the relaxed length of the spring and if the amplitude of the oscillation is A . Which is the maximum kinetic energy of the oscillation? 
选项：
A:
B:
C:
D:
答案: 【】

5、 问题:A simple pendulum consists of a massive bob connected to the end of a very light string. Ignore air resistance. Which one of the following changes should be made in order to increase the period of the pendulum?
选项：
A:Increase the mass of the bob. 
B:Decrease the mass of the bob.
C:Increase the length of the string.
D:Decrease the maximum angle of the pendulum’s oscillation. 
答案: 【Increase the length of the string.】

6、 问题:A block is attached to a spring hung vertically. After being slowly lowered, it is hung at rest with the spring stretched by 15.0 cm. If the block is raised back up and released from rest with the spring unstretched, what is the amplitude of its oscillations?
选项：
A:7.5 cm
B:15.0 cm
C:30.0 cm
D:60.0 cm
答案: 【15.0 cm】

7、 问题:A damped harmonic oscillator with the natural angular frequency   and very little damping is driven by an external force  . When it reaches the stable state, the oscillating angular frequency is______
选项：
A:  
B:
C:
D:None of these answers are correct
答案: 【】

8、 问题:The graph of vibration of the particle in SHM is shown in the figure. The period  of the vibration equals___  s.
答案: 【(以下答案任选其一都对)4.8;
4.8 s;
4.8s】

9、 问题:A 1.0 kg  block is attached to a spring with spring constant 16 N/m  and is at rest on a smooth horizontal plane. It is hit with a hammer and acquires instantaneously a speed of 0.40 m/s. The speed of the block at x = A/2 is _____   m/s  (round to two decimal places ).
答案: 【0.35】

10、 问题:An object of mass m is attached to a horizontal spring, stretched to a displacement A from equilibrium and released, undergoing harmonic oscillations on a frictionless surface with period  . The experiment is then repeated with a mass of 4m. The ratio  of the new period of oscillation and the old period is_____ .
答案: 【(以下答案任选其一都对)2;
2.0】

02 Mechanical Waves Unit Test 2

1、 问题:
选项：
A:
B:
C:
D:
答案: 【】

2、 问题:
选项：
A:
B:
C:
D:
答案: 【】

3、 问题:
选项：
A:
B:
C:
D:
答案: 【】

4、 问题:While a guitar string is vibrating, you gently touch the midpoint of the string to ensure that the sting does not vibrate at that point. Which normal modes cannot be present on the string while you are touching it in this way?
选项：
A:n = 1, 2, 3, 4, 5,…
B:n =  2, 4, 6,…
C:n =  1, 3, 5,…
D:n =  1
答案: 【n =  1, 3, 5,…】

5、 问题:
选项：
A:0.6m
B:3.0m
C:75.0m
D:375.0m
答案: 【75.0m】

6、 问题: The six strings of a guitar are the same length and under nearly the same tension, but they have different thicknesses. On which string do waves travel the fastest?
选项：
A: The thickest string. 
B:The thinnest string.
C:The wave speed is the same on all strings .
D:None of these.
答案: 【The thinnest string.】

7、 问题:
选项：
A:6
B:8
C:9
D:12
答案: 【9】

8、 问题:
选项：
A:
B:0
C:
D:
答案: 【】

9、 问题: A traveling wave is propagating in an elastic medium and at time t  the particle at position P  has the maximum displacement. The potential energy of the particle at position P  is _____ (filling in “maximum”, “minimum”, or “zero”).
答案: 【(以下答案任选其一都对)ZERO;
zero】

10、 问题:A stretched string fixed at two ends has a mass of  0.08kg  and a length of  8.00m. The tension in the string is 64.0N . There exists a standing wave on the string. For the third harmonic, the vibration frequency is                Hz (Keep only the integer portion).
答案: 【15】

03 Sound and Hearing Unit Test 3

1、 问题:You use an electronic signal generator to produce a sinusoidal sound wave in air. You then increase the frequency of the wave from 100Hz to 400Hz  while keeping the pressure amplitude constant. What effect does this have on the displacement amplitude of the sound wave?
选项：
A:It becomes four times greater.
B: It becomes twice as great.
C:It becomes 1/3 as great.  
D:It becomes 1/4 as great. 
答案: 【It becomes 1/4 as great. 】

2、 问题:A tuning fork placed over a 0.57m column of air closed only at its bottom end produces a standing wave in the 3rd harmonic. The speed of sound in air is 342m/s. What is the frequency of the tuning fork? 
选项：
A:150Hz
B:300Hz
C:450Hz
D:600Hz
答案: 【450Hz】

3、 问题:A standing wave is created in an air-filled tube open at both ends when a tuning fork of frequency 552Hz is placed near one of the open ends. A tuning fork of frequency 644Hz produces the next higher harmonic for this tube. Assume that the speed of sound in air is 340m/s. What is the length of the open tube?
选项：
A:0.46m
B:0.92m
C:1.59m
D:1.85m
答案: 【1.85m】

4、 问题:A flute has a length of 58.0 cm. If the speed of sound in air is 343m/s , what is the fundamental frequency of the flute, assuming it is a tube closed at one end and open at the other?   
选项：
A:148 Hz
B:296 Hz
C:444 Hz
D:591 Hz
答案: 【148 Hz】

5、 问题:
选项：
A:
B:
C:
D:
答案: 【】

6、 问题:A stopped organ pipe of length L has a fundamental frequency of  220 Hz. For which of the following organ pipes will there be a resonance if a tuning fork of frequency  660Hz is sounded next to the pipe?