Physics 011

Chapter 11: Vibrations and Waves
Practice Questions

Quiz#11

 

1

The unit for the spring constant is

 

Nm

 

J

 

Ns

 

N/m

 

2

The unit for the period is

 

s

 

/s

 

m*s

 

T

 

3

The unit for frequency is

 

s

 

s2

 

/m

 

Hz

 

4

The unit for wavelength is

 

/m

 

m/s

 

m

 

m*s

 

5

The unit for the product of wavelength and frequency is

 

m*s

 

Hz

 

s/m

 

m/s

 

6

The amplitude of the wave in the figure is

 

2 m

 

4 m

 

6 m

 

8 m

 

7

The wavelength is

 

2 m

 

4 m

 

6 m

 

Cannot be determined from the given information.

 

8

The frequency of the wave is

 

.5 Hz

 

1 Hz

 

2 Hz

 

4 Hz

 

9

A stretched spring, fixed at both ends, vibrates at a frequency of 12 Hz with a standing transverse wave pattern as shown. What is this spring's fundamental frequency?

 

36 Hz

 

16 Hz

 

8 Hz

 

4 Hz.

 

10

A stretched spring, fixed at both ends, vibrates at a frequency of 12 Hz with a standing transverse wave pattern as shown. What would be the frequency of the first overtone?

 

36 Hz

 

16 Hz

 

8 Hz

 

4 Hz

 

11

A stretched spring, fixed at both ends, vibrates at a frequency of 12 Hz with a standing transverse wave pattern as shown. If the string is 5 meters long, what is the wave velocity?

 

60 m/s

 

40 m/s

 

20 m/s

 

10 m/s

 

12

If a string has a wave speed of 200 m/s and a mass per length ratio of 1.2 g/m, what is the tension?

 

48000 N

 

48 N

 

240 N

 

.24 N

 

13

A stretched cord has a fundamental frequency of 144 Hz, a length of .9 m, and a mass of 2 g. What is its wave speed?

 

259 m/s

 

130 m/s

 

65 m/s

 

1037 m/s

 

14

A stretched cord has a fundamental frequency of 144 Hz, a length of .9 m, and a mass of 2 g. What is the tension on the cord?

 

29 N

 

79 N

 

149 N

 

Not enough information is given.

 

15

The animation shows the Tacoma Narrows Bridge (see Online Destinations) shortly before its collapse. What is its frequency?

 

.1 Hz

 

.25 Hz

 

.50 Hz

 

1 Hz

 

16

The animation shows the Tacoma Narrows Bridge (see Online Destinations) shortly before its collapse. The distance between the bridge towers (nodes) was about 860 meters and there was also a midway node. What was the wavelength of the standing torsional wave?

 

1720 m

 

860 m

 

420 m

 

There is no way to tell.

 

17

The animation shows the Tacoma Narrows Bridge (see Online Destinations) shortly before its collapse. What is the amplitude?

 

.4 m

 

4 m

 

8 m

 

14 m

 

18

The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also.

What is the wavelength of the black wave?

 

2 cm

 

4 cm

 

6 cm

 

8 cm

 

19

The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also.

What is the frequency of the black wave?

 

.13 Hz

 

.25 Hz

 

.33 Hz

 

.5 Hz

 

20

The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also.

What is the frequency of the red wave?

 

.13 Hz

 

.25 Hz

 

.33 Hz

 

.5 Hz

 

21

The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also.

What is the velocity of the black wave?

 

.5 cm/s

 

1 cm/s

 

1.5 cm/s

 

2 cm/s

 

22

The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also.

What is the velocity of the red wave?

 

.25 cm/s

 

.5 cm/s

 

1.5 cm/s

 

2 cm/s

 

23

The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also.

What is the amplitude of the red wave?

 

1 cm

 

2 cm

 

3 cm

 

4 cm

 

24

If the effective spring constant of a 2000 kg older car (with poor shocks) is 60000 N/m, what is the period of its vibration after hitting a bump?

 

.15 s

 

.5 s

 

1.15 s

 

2 s

 

25

What is the effective spring constant of a 10 kg, 1.5 m simple pendulum?

 

6.5 N

 

98 N

 

9.8 N

 

65 N/m