Question #1 A pendulum is observed to complete 30 full cycles in 50 seconds. Determine the period and the frequency of the pendulum.

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Presentation transcript:

Question #1 A pendulum is observed to complete 30 full cycles in 50 seconds. Determine the period and the frequency of the pendulum.

ANSWER T = 1.7 s F = .59 Hz

Question #2 Frieda the fly flaps its wings back and forth 150 times each second. The period of the wing flapping is _________ sec.

ANSWER 1 s / 150 flaps = .007 s

Question #3 If you wished to produce a sound with a wavelength in air equal to the length of a 5-m room, what would its frequency be? (Note: The speed of sound in room temperature is ~340 m/s.)

ANSWER 68 Hz

Question #4 You note a 2-second delay for an echo in a canyon. What is the distance to the wall of the canyon?

ANSWER 340 m

Question #5 Waves in a lake are 1.5 m in length and pass an anchored boat 0.5 s apart. What is the speed of the waves?

ANSWER 3 m/s

Question #6 A boat at anchor is rocked by waves whose crests are 28 m apart and whose speed is 7 m/s. How often do these waves reach the boat?

ANSWER 4 s

Question #7 Radio amateurs are permitted to communicate on the “10-meter band”. What frequency of radio waves corresponds to a wavelength of 10 m? (The speed of radio waves is 3.0 108 m/s.)

ANSWER 3 X 10^7 Hz

Question #8 A radio station broadcasts at a frequency of 600 kHz. Knowing that radio waves have a speed of 3.00 108 m/s, what is the wavelength of these waves?

ANSWER 500 m

Question #9 An explosion occurs 340 km away. Given that sound travels at 340 m/s, What is the time the sound takes to reach you ?

ANSWER 1000 s

14. The string at the right is 1 14. The string at the right is 1.5 meters long and is vibrating as the first harmonic. The string vibrates up and down with 20 complete vibrational cycles in 5 seconds. Determine the frequency, period, wavelength and speed for this wave.

ANSWER Wavelength = 3 m frequency = 4 Hz period = .25 s Speed = 12 m/s