A spring with a spring constant k = 8 N/m is stretched 0.03 m and released. It bobs up and down every 1.4 seconds. What is its amplitude (in m) ? Please input your answer as a positive value with two decimal places.

Your Answer:

Question 1 options:

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Question 2 (0.5 points)

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A spring with a spring constant k = 8 N/m is stretched 0.05 m and released. It bobs up and down every 2.6 seconds. What is its frequency (in Hz) ? Please input your answer as a positive value with two decimal places.

Your Answer:

Question 2 options:

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Question 3 (1 point)

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A humming bird flaps its wings 110 times per second producing a sound. How far does the sound travel in air at 20 degrees Celsius between wing beats (i.e. find the wavelength in meters)? Please input your answer as a positive value with two decimal places.

Your Answer:

Question 3 options:

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Question 4 (1 point)

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A musical note has a frequency of 512 Hz. The wavelength of this note will be different depending on what it is traveling through. Please rank the media in the order that will give this note longer and longer wavelengths (so shortest wavelength to longest wavelength).

Question 4 options:

12345	Aluminum
12345	Water
12345	Glass
12345	Air
12345	Helium

Question 5 (1 point)

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A bat emits a sound and receives an echo 0.16 seconds later. How close (in m) is the insect he is after? (Assume that it is 20 degrees Celsius.) Please input your answer as a positive value with two decimal places.

Your Answer:

Question 5 options:

Answer

Question 6 (1 point)

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You are standing by two speakers emitting waves with a wavelength of 10 meters.

Please select ALL of the true statements below:

Question 6 options:

	When you are 10 m away from both speakers the waves will be destructive
	When you are 15 m away from both speakers the waves will be destructive
	When you are 10 m away from one speaker and 20 m away from the other the waves will be constructive
	When you are 10 m away from one speaker and 20 m away from the other the waves will be destructive
	When you are 15 m away from one speaker and 20 m away from the other the waves will be constructive
	When you are 10 m away from both speakers the waves will be constructive
	When you are 15 m away from one speaker and 20 m away from the other the waves will be destructive
	When you are 15 m away from both speakers the waves will be constructive

Question 7 (1 point)

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A piano tuner is tuning a piano. He strikes a tuning fork of 550 Hz and hits the piano key and hears 5 beats. If he knows that the piano key is flat (i.e. lower than the tuning fork) what is the frequency (in Hz) of the piano key? Please input your answer as a positive value with two decimal places.

Your Answer:

Question 7 options:

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Question 8 (1 point)

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Below are some of the harmonics of the G note at 49 Hz. Please select all the frequencies that are also considered to be "G" (i.e. the ones that are octaves of that note).

Question 8 options:

	49 Hz
	392 Hz
	147 Hz
	98 Hz
	294 Hz
	196 Hz
	245 Hz
	343 Hz